Sign in
Search piclist
Subscribe to piclist
piclist by Keywords
12F675 | 16F628 | 16F84 | 16f877 | 16F877A | 16F88 | 18F458 | ADC | AVR | Bootloader | CAN | CCS | CRC | EAGLE | EEPROM | ICD | ICSP | IDE | JDM | LED | Macros | Microchip | MPLAB | PCB-CAD | PIC10F | Pic12f675 | PIC16F84 | PIC16F84A | PIC16F877 | PIC18 | PIC18F452 | PicBasic | PICC | PICSTART | PWM | RS-485 | RS232 | SMT | SPI | UART | USART | USB | Wireless | Wisp628 | Xilinx
Ads
Discussion Groups
Discussion Groups | Piclist | Re: Why PIC?
A discussion group for the PICMicro microcontroller. Also called the Microchip PIC, this list is dedicated to the use and abuse of this fine, simple, microcontroller. Close to topic posts are welcome, ie. general electronics.
Why PIC? - Trikoupis Nikolaos - Feb 26 5:56:00 2005
|
Hello to everyone! I was wondering why should I use PIC? The new mobile phones for example include tiny CPUs running at hundrents of MHz, consume very little power and seem to be very powerfull. Something more they use ultra small memory cards with hundrents of MBs capacitance while the EEPROMs for example have a few Kbs.( I tried searching for a pdf about how do these memory cards work with no results). Is it because PICs are commercialy available while the other chips are patented and can only be used by them. Has pic some features that are better in technology and I don't know it? Are PICs a small step to pass to these chips in the future? Thank you! |
(You need to be a member of piclist -- send a blank email to piclist-subscribe@yahoogroups.com )
RE: Why PIC? - Wouter van Ooijen - Feb 26 8:52:00 2005
|
> I was wondering why should I use PIC? The new mobile phones for > example include tiny CPUs running at hundrents of MHz, consume very > little power and seem to be very powerfull. They also have 100's of tiny little legs that require $$$ machines to work with. And they are cheap, provided that you buy at least 10.000. Wouter van Ooijen -- ------------------------------------------- Van Ooijen Technische Informatica: www.voti.nl consultancy, development, PICmicro products docent Hogeschool van Utrecht: www.voti.nl/hvu |
(You need to be a member of piclist -- send a blank email to piclist-subscribe@yahoogroups.com )
RE: Why PIC? - Nick Trik - Feb 26 11:09:00 2005
|
I don't think package has anything to do with technology level and hardware
capabilities. So, your answer is because they are available in DIP package and can be
bought in low quantites? I don't believe that they(e.x. microchip) can't make a
powerful microcontroller for hobbists. But why don't they? Wouter van Ooijen <w...@voti.nl> wrote: > I was wondering why should I use PIC? The new mobile phones for |
(You need to be a member of piclist -- send a blank email to piclist-subscribe@yahoogroups.com )
RE: Why PIC? - Wouter van Ooijen - Feb 26 11:20:00 2005
|
> I don't think package has anything to do with technology level and hardware capabilities. No, but the OP (you?) asked "I was wondering why should I use PIC?". Package is a very good answer to that question. > So, your answer is because they are available in DIP package and can be bought in low quantites? I don't believe that they(e.x. microchip) can't make a powerful microcontroller for hobbists. But why don't they? I don't understand what you are asking. No-one makes hobby processors. uChip makes cheap uC's that happen to be attractive for hobbyists. For more powerfull chips check for instance Mircochip's dsPICs, the Ubicom chips, or ARM chips (Atmel, Philips). Wouter van Ooijen -- ------------------------------------------- Van Ooijen Technische Informatica: www.voti.nl consultancy, development, PICmicro products docent Hogeschool van Utrecht: www.voti.nl/hvu |
(You need to be a member of piclist -- send a blank email to piclist-subscribe@yahoogroups.com )
RE: Why PIC? - Chris - Feb 26 11:24:00 2005
|
Hi,
Microchip is not in the market of making products for hobbyists.
The fact that so many hobbyists use Microchip is a testimate to their ease of use,
flexibility and power. The PIC devices are very capable and very powerful. There are
a large number of onboard peripherals available and you can choose among many different
programming languages. Microchip also makes a huge variety of chips so you can pick one
that closely meets your needs.
The devices are inexpensive - many less than a dollar - and
easy to use despite the power available. A microcontroller is not meant to be a general
purpose CPU. It is meant to be used for specific interfacing tasks. If you want general
purpose then by all means develop for one of the ARM processors using an embedded OS
like Windows CE. It's a lot more expensive and a lot more complicated. I know - I've
worked on embedded operating systems.
Choose the tool that is appropriate for your
task.
As for
why you should use a PIC? Here are some reasons:
1. Lots
of support available from Microchip and the web.
2. Very
simple learning curve compared to a full blown CPU and embedded OS.
3.
Microchip provides free development tools which are VERY good.
4. PIC
devices are inexpensive and PIC programmers are cheap or even free if you build your
own.
5. PIC
devices are simple to interface. Some devices need power and ground. All others need
power, ground, a clock source and one pin tied high.
6. PIC
devices have very flexible IO pins that are easy to interface to the outside world. Often
a direct connection to your external device is all you need.
7. PICs
have onboard EEPROM, RAM and program FLASH ROM. Many also have onboard peripherals
like A/D converters, I2C busses, RS232 compatible serial ports, USB ports, comparators and
other cool stuff. Often a PIC solution is a ONE CHIP solution in your project. You
can't do this with a general purpose CPU.
If you
have a project that needs some "brains" and you don't want to add a large amount of cost,
complexity or learning curve to your project then a PIC is the way to
go.
Hope
this helps.
Chris
Levin
http://pic.rocklizard.org
From: Nick Trik [mailto:n...@yahoo.gr] Sent: Saturday, February 26, 2005 8:10 AM To: p...@yahoogroups.com Subject: RE: [piclist] Why PIC? I don't think package has anything to do with technology level and hardware
capabilities. So, your answer is because they are available in DIP package and can be
bought in low quantites? I don't believe that they(e.x. microchip) can't make a
powerful microcontroller for hobbists. But why don't they?
Wouter van Ooijen <w...@voti.nl> wrote: > I was wondering why should I use PIC? The new mobile phones for
to unsubscribe, go to http://www.yahoogroups.com and follow the instructions |
|
|
(You need to be a member of piclist -- send a blank email to piclist-subscribe@yahoogroups.com )
Re: Why PIC? - rtstofer - Feb 26 11:30:00 2005
|
--- In , Nick Trik <ntricoup@y...> wrote: > I don't think package has anything to do with technology level and hardware capabilities. So, your answer is because they are available in DIP package and can be bought in low quantites? I don't believe that they(e.x. microchip) can't make a powerful microcontroller for hobbists. But why don't they? You can buy other types of processors - there are MANY different types. The PIC is a microcontroller. It has very little computational ability, it doesn't support a large memory space, but it does have a lot of specialized hardware that is applicable to control. PWM, A2D, CCP, I2C, Serial, etc. The processors you wonder about for cell phones are very likely application specific with bizarre instruction sets that are useful for telephony only. Intel and others make processors for PDAs that are much more general purpose, support large memory sizes and don't necessarily have specialized hardware. Quantity one, they aren't cheap. Here is one with opportunistic pricing: http://www.acroname.com/robotics/parts/R231-SP-KIT400.html Then again, you can build any type of CPU you want with an FPGA. Full featured CPUs with memory can be built from the Xilinx Spartan 3 Starter Board - especially the 1,000,000 gate version - for ab out $100. Not nearly as fast as the PIC is the Philips 80C552 which has all of the control features of the mid range PIC but also supports a larger memory space - 64K byte code space and 64K byte data space. None of these will keep up with a Pentium 4 - which also doesn't have control hardware. Smaller versions such as the miniITX stuff could be much more useful for robotics - but they don't have control hardware either. So, in the end, something like a PIC will be included to control the motors, knobs and dials. But they are microcontrollers, not general purpose CPUs. > Wouter van Ooijen <wouter@v...> wrote:> I was wondering why should I use PIC? The new mobile phones for > > example include tiny CPUs running at hundrents of MHz, consume very > > little power and seem to be very powerfull. > > They also have 100's of tiny little legs that require $$$ machines to > work with. And they are cheap, provided that you buy at least 10.000. > > Wouter van Ooijen > > -- ------------------------------------------- > Van Ooijen Technische Informatica: www.voti.nl > consultancy, development, PICmicro products > docent Hogeschool van Utrecht: www.voti.nl/hvu > > > to unsubscribe, go to http://www.yahoogroups.com and follow the instructions > Yahoo! Groups SponsorADVERTISEMENT > --------------------------------- > Yahoo! Groups Links > > To > --------------------------------- |
(You need to be a member of piclist -- send a blank email to piclist-subscribe@yahoogroups.com )
Re: Why PIC? - Mr S - Feb 26 13:48:00 2005
|
Sorry for the length... Well, there are many reasons to use a PIC, and many reasons not to, it all depends on your design goals. If you want to learn more about mobile phones, try going to the TI website and search their OMAP products, because this is exactly the kind of thing that makes new mobile phones do what they do... Once you get there, you will find that OMAP is based on the ARM9 or ARMx processors. And shortly after that, if you want xx MIPS for your project, you'll decide that you need an ARMx, XScale, or FreeScale processor... then sadly, sometime after that, you'll find out that if you want to do something like build a robot, you will have to make that processor do lots of other things and interface to many things... so you'll want to simply send serial commands to control your wheels and other peripheral devices... Sadly, without the serial interfact to things like wheels, that means sending PWM and control signals to an H-Bridge to drive the motors, and reading shaft encoder counts to know how fast it is turning... and using precious I/O lines on your big processor to simply control the direction of your wheels. Then you will want to use a Peripheral Interface Controller such as a low end dsPic from microchip which has a hardware USART, includes PWM channels, extra I/O for controlling an H-Bridge, and a Quadrature Encoder Interface for counting shaft encoder counts, plus memory for storing that information... then you'll slave the clock of the dsPIC to your ARMx processor and be able to send serial commands to read the encoder counts on your wheel for the last 5-10 seconds, plus recieve interrupt requests from that dsPIC when the bumper sensor it controls has been activated... All of this allows your very big ARMx to be doing the things you want it to do instead of the mundane wheel tick counting... Spend some time thinking about scaling your design to use minimum resources rather than trying to get one thoroughbred race horse to pull all the cottoncandy carts at the fair one at a time, how about a few smaller ponies to do that so the race horse has time to show off what it can do. You don't want to waste all the I/O on your ARMx for mundane things if you don't have to, and ESPECIALLY if you can use a couple of them to interface to a PIC CAN transceiver so that those same lines can talk to a dozen or more PICs that are doing the mundane work. There are thousands of things a uC can do with only a few MIPS that augment your big processor, examples of this can be seen in the various uC elements in your standard PC that do stuff so the big processor doesn't have to. (serial ports, keyboard, harddrives, floppy controller, powersupply, etc...) There are also thousands of projects that need a uC that is small, low power, and needs no OS... things like a digital clock, speedometer, digital thermometer, R/C car speed controller, 4 port ethernet hub, battery charger, and on and on and on... So the answer is not which you should use, but when you should use which one.... Some folks have done things with a PIC like remote camera operation to capture wildlife in action, bridge to an ISA ethernet controller, add Internet interface to the pan and tilt of a web cam for remote viewing etc... In your tool box, I'm sure there are different sized screwdrivers, and so in your design tool box, you should have different sized uC parts/tools. The size of your main CPU is not the only consideration. System resources of your final project and how they are used is a major consideration. If your project has small requirements, wasting a $200+ CPU to do it when a $6 PIC would suffice is just absurd. Hope that helps --- Trikoupis Nikolaos <> wrote: > I was wondering why should I use PIC? The new mobile > phones for > example include tiny CPUs running at hundrents of > MHz, consume very > little power and seem to be very powerfull. > Something more they use > ultra small memory cards with hundrents of MBs > capacitance while the > EEPROMs for example have a few Kbs.( I tried > searching for a pdf > about how do these memory cards work with no > results). Is it because > PICs are commercialy available while the other chips > are patented > and can only be used by them. Has pic some features > that are better > in technology and I don't know it? Are PICs a small > step to pass to > these chips in the future? > Thank you! > to unsubscribe, go to http://www.yahoogroups.com and > follow the instructions > Yahoo! Groups Links __________________________________________________ ">http://mail.yahoo.com |
(You need to be a member of piclist -- send a blank email to piclist-subscribe@yahoogroups.com )
RE: Why PIC? - Wouter van Ooijen - Feb 26 14:36:00 2005
|
> If you want
general purpose then by all means develop for one of the ARM processors using an
embedded OS like Windows CE.
Are you sure? An Atmel
or Philips ARM chip kan be bought for roughly the price of an 18F. That does not buy
you windows CE, but personally I don't see why you would want that.
Wouter van Ooijen |
(You need to be a member of piclist -- send a blank email to piclist-subscribe@yahoogroups.com )
RE: Why PIC? - Chris - Feb 26 19:29:00 2005
|
I mentioned CE as it fits in the "General Purpose" category and
it's expensive.
-Chris From: Wouter van Ooijen [mailto:w...@voti.nl] Sent: Saturday, February 26, 2005 11:37 AM To: p...@yahoogroups.com Subject: RE: [piclist] Why PIC? > If you want
general purpose then by all means develop for one of the ARM processors using an
embedded OS like Windows CE.
Are you sure? An Atmel
or Philips ARM chip kan be bought for roughly the price of an 18F. That does not buy
you windows CE, but personally I don't see why you would want that.
Wouter van Ooijen to unsubscribe, go to http://www.yahoogroups.com and follow the instructions |
(You need to be a member of piclist -- send a blank email to piclist-subscribe@yahoogroups.com )
Re: Why PIC? - rtstofer - Feb 27 13:57:00 2005
|
An alternative I am considering: http://www.newmicros.com/ I am not a big fan of Forth but I do like using state machines and the IsoMax language with a fast DSP chip is very interesting. Look especially at the SeroPod - now this is a servo controller! It is being used at http://www.lynxmotion.com/Category.aspx? CategoryID=68 Check out the movies, this is an elegant bit of motion control. There is some very clever work being done. --- In , "Wouter van Ooijen" <wouter@v...> wrote: > > If you want general purpose then by all means develop for one of the > ARM processors using an embedded OS like Windows CE. > > Are you sure? An Atmel or Philips ARM chip kan be bought for roughly the > price of an 18F. That does not buy you windows CE, but personally I > don't see why you would want that. > Wouter van Ooijen > > -- ------------------------------------------- > Van Ooijen Technische Informatica: www.voti.nl > consultancy, development, PICmicro products > docent Hogeschool van Utrecht: www.voti.nl/hvu |
|
|
(You need to be a member of piclist -- send a blank email to piclist-subscribe@yahoogroups.com )
Re: Re: Why PIC? - Mr S - Feb 27 14:19:00 2005
|
Yes, the TinyARM looks pretty impressive, though I'm not so enthuzed about forth, or third even... From what I understand, NMI is starting to, or planning to support C, and for me, that would make it a must look into deal. I'm still most impressed by the dsPIC line at the moment. Parallel processing for robotics seems much more workable when the uC's involved have specialized task functionality that I don't have to buid into them all the time. I'm still searching for answers to "What's the best tactic to do video analysis?" and FPGA seems to be the winning answer at the moment. Again, I'm looking at a solution that is multiprocessor, multitasking, and synchronized. Does anyone out there have information about PIC being used in a video analysis application? I'll use PIC to control the camera platform(s) physical motion, but that means taking the analysis data and shuffling it out to the PIC(s) to make the required camera position adjustments. This little project that I'm researching seems to get bigger by the hour.... Cheers --- rtstofer <> wrote: > > > An alternative I am considering: > http://www.newmicros.com/ I am not > a big fan of Forth but I do like using state > machines and the IsoMax > language with a fast DSP chip is very interesting. > > Look especially at the SeroPod - now this is a servo > controller! It > is being used at > http://www.lynxmotion.com/Category.aspx? > CategoryID=68 Check out the movies, this is an > elegant bit of > motion control. > > There is some very clever work being done. > > --- In , "Wouter van Ooijen" > <wouter@v...> > wrote: > > > If you want general purpose then by all means > develop for one of > the > > ARM processors using an embedded OS like Windows > CE. > > > > Are you sure? An Atmel or Philips ARM chip kan be > bought for > roughly the > > price of an 18F. That does not buy you windows CE, > but personally I > > don't see why you would want that. > > > > > > Wouter van Ooijen > > > > -- ------------------------------------------- > > Van Ooijen Technische Informatica: www.voti.nl > > consultancy, development, PICmicro products > > docent Hogeschool van Utrecht: www.voti.nl/hvu > to unsubscribe, go to http://www.yahoogroups.com and > follow the instructions > Yahoo! Groups Links __________________________________________________ ">http://mail.yahoo.com |
(You need to be a member of piclist -- send a blank email to piclist-subscribe@yahoogroups.com )
Re: Why PIC? - rtstofer - Feb 27 14:50:00 2005
|
--- In , Mr S <szinn_the1@y...> wrote: > Yes, the TinyARM looks pretty impressive, though I'm > not so enthuzed about forth, or third even... From > what I understand, NMI is starting to, or planning to > support C, and for me, that would make it a must look > into deal. I was looking at the IOSPod and ServoPod - these things are powerful! Everything runs essentially parallel with a schedule timer of 5MHz. What I don't know is just how large a program can get. I have seen the example code for the hexapod and it is sizeable. And clear as mud as most of it is written in Forth. I'll just have to keep at it until I understand it... > I'm still most impressed by the dsPIC line at the > moment. Parallel processing for robotics seems much > more workable when the uC's involved have specialized > task functionality that I don't have to buid into them > all the time. > > I'm still searching for answers to "What's the best > tactic to do video analysis?" and FPGA seems to be the > winning answer at the moment. Again, I'm looking at a > solution that is multiprocessor, multitasking, and > synchronized. Does anyone out there have information > about PIC being used in a video analysis application? I know exactly nothing about video analysis but the CMUcam uses a Scenix SX-52 chip to process the video and do such things as color tracking. The thing is, this is very low resolution stuff at a fairly low frame rate. As I still know exactly nothing about video analysis, I couldn't even guess what the archiecture of the machine should be. If something like 256K of 32 bit memory and 1,000,000 gates seems feasible, the revised Spartan 3 Starter Board (https://www.digilentinc.com/Sales/Product.cfm?Prod=S3BOARD) is fairly cheap. You have to go to Add To Card to get the price for the 1M gate version (total $149). I REALLY like FPGAs - they can be used to build just about anything! > I'll use PIC to control the camera platform(s) > physical motion, but that means taking the analysis > data and shuffling it out to the PIC(s) to make the > required camera position adjustments. > > This little project that I'm researching seems to get > bigger by the hour.... Yes, I have been working on a ball chasing Hummer and I am still having problems with the color tracking. So far, I am not terribly impressed with the CMUcam. I just need to keep hammering on it until I get what I need. Or, I need to become proficient in video analysis - a subject I was planning to avoid. > Cheers |
|
|
(You need to be a member of piclist -- send a blank email to piclist-subscribe@yahoogroups.com )
Help needed badly - Substraction using PIC code - Devon Lee - Feb 27 14:52:00 2005
|
Hi there, Would like to ask you something about the PIC program to perform subtraction. Mind to comment about it? Thanks in advance. In the following, am I right to say that '00011111' minus '00000001'? But it is 2's complement? Mind teaching about this matter? Not very sure about it. Does it mean that '00011111' will be converted into '11100000' and this value will added with '1' and in the end, I obtained '11100001'? But then, I do not know how to continue from here, mind teaching? Please? Hope you dont mind me asking such direct help. Please? ------------------------------------- MOVLW B'00000001' SUBLW B'00011111' BTFSS STATUS,C BTFSC STATUS,Z BSF PORTC,2 GOTO START END ------------------------------------- __________________________________ |
(You need to be a member of piclist -- send a blank email to piclist-subscribe@yahoogroups.com )
Re: Help needed badly - Substraction using PIC code - rtstofer - Feb 27 15:28:00 2005
|
--- In , Devon Lee <devonsc@y...> wrote: > Hi there, > > Would like to ask you something about the PIC program > to perform subtraction. Mind to comment about it? > Thanks in advance. > > In the following, am I right to say that '00011111' > minus '00000001'? I don't understand this question. Both are positive binary numbers. > But it is 2's complement? Mind > teaching about this matter? Not very sure about it. Two's complement is used by almost every modern arithmetic logic unit. Among other things, it eliminates the possibility of a -0 result. There are thousands of explanations on the Internet that will be better than this - use Google: To form the 2's complement of a number, complement the number and add 1. 00000101 +5 11111010 complement 00000001 +1 -------- 11111011 -5 as 2s complement 00001000 +8 11111011 -5 -------- 00000011 +3 result of addition - ignore the carry out. 00001000 +8 11110111 complement 11111000 add 1 to get -8 00000011 +3 11111000 -8 -------- 11111011 a negative result (-5) 00000100 complement 00000001 add 1 -------- 00000101 +5 so the result above was really -5 as expected > Does it mean that '00011111' will be converted into > '11100000' and this value will added with '1' and in > the end, I obtained '11100001'? Yes > But then, I do not know how to continue from here, > mind teaching? Please? Hope you dont mind me asking > such direct help. Please? Two's complement arithmetic is actually used inside the arithmetic unit. The PIC, however, has SUB and SUBLW instructios so there is no particular need to deal with the number system directly except to understand what is going on. If those instructions had been omitted you could do the arithmetic with ADDWF and ADDLW. > ------------------------------------- > MOVLW B'00000001' > SUBLW B'00011111' I don't know what you were expecting but SUBLW subtracts W ('00000001' in this case) from the literal ('00011111' in this case) and will result in '00011110'. This is NOT the result I would expect from SUBLW based on ADDLW but it is what the chip does. > BTFSS STATUS,C > BTFSC STATUS,Z > BSF PORTC,2 > GOTO START > END > ------------------------------------- > > > __________________________________ |
|
|
(You need to be a member of piclist -- send a blank email to piclist-subscribe@yahoogroups.com )
Re: Re: Help needed badly - Substraction using PIC code - Devon Lee - Feb 27 16:07:00 2005
|
Thank you so so much for the detail explanation. Thanks a lot. --- rtstofer <> wrote: > --- In , Devon Lee > <devonsc@y...> wrote: > > Hi there, > > > > Would like to ask you something about the PIC > program > > to perform subtraction. Mind to comment about it? > > Thanks in advance. > > > > In the following, am I right to say that > '00011111' > > minus '00000001'? > > I don't understand this question. Both are positive > binary numbers. > > > But it is 2's complement? Mind > > teaching about this matter? Not very sure about > it. > > > > Two's complement is used by almost every modern > arithmetic logic > unit. Among other things, it eliminates the > possibility of a -0 > result. There are thousands of explanations on the > Internet that > will be better than this - use Google: > > To form the 2's complement of a number, complement > the number and > add 1. > > 00000101 +5 > 11111010 complement > 00000001 +1 > -------- > 11111011 -5 as 2s complement > > 00001000 +8 > 11111011 -5 > -------- > 00000011 +3 result of addition - ignore the carry > out. > > 00001000 +8 > 11110111 complement > 11111000 add 1 to get -8 > > 00000011 +3 > 11111000 -8 > -------- > 11111011 a negative result (-5) > > 00000100 complement > 00000001 add 1 > -------- > 00000101 +5 so the result above was really -5 as > expected > > > Does it mean that '00011111' will be converted > into > > '11100000' and this value will added with '1' and > in > > the end, I obtained '11100001'? > > Yes > > > > > But then, I do not know how to continue from here, > > mind teaching? Please? Hope you dont mind me > asking > > such direct help. Please? > > Two's complement arithmetic is actually used inside > the arithmetic > unit. The PIC, however, has SUB and SUBLW > instructios so there is > no particular need to deal with the number system > directly except to > understand what is going on. If those instructions > had been omitted > you could do the arithmetic with ADDWF and ADDLW. > > > > > ------------------------------------- > > MOVLW B'00000001' > > SUBLW B'00011111' > > I don't know what you were expecting but SUBLW > subtracts W > ('00000001' in this case) from the literal > ('00011111' in this case) > and will result in '00011110'. > > This is NOT the result I would expect from SUBLW > based on ADDLW but > it is what the chip does. > > > BTFSS STATUS,C > > BTFSC STATUS,Z > > BSF PORTC,2 > > GOTO START > > END > > ------------------------------------- > > > > > > > > > > > > > > > > __________________________________ > __________________________________ |
(You need to be a member of piclist -- send a blank email to piclist-subscribe@yahoogroups.com )
Re: Why PIC? - Murugan - Feb 28 1:16:00 2005
|
The pic microcontroller is preffered by most of the
developers to easily build on prototypes and develop pre commercial release working
models with minimum cost and simplicity. The other type of processors like
pentium, arm,etc.. used in mobile phones may be cheap while manufactured in bulk
quantities, but proves costly during development phase which requires high
price develpment tools. And basically any project which works well using Pic
micro will do well when ported to other micros.
murugan
|
(You need to be a member of piclist -- send a blank email to piclist-subscribe@yahoogroups.com )
Re: Why PIC? - Igor Janjatovic - Feb 28 5:17:00 2005
|
> I was wondering why should I use PIC? Besides multimedia devices (PDA, mobile phone, MP3 player...) everything else is PICed :) If you have no intention to deal with multimedia devices then PIC (or any other similar 8-bit MCU) should be your choice. On the other hand, if you are thinking about making some of above mentioned multimedia devices - think again. It's cheaper to buy one and it sure saves some time :) Finally, if you are still interested in 200MHz processor with 16MB memory you can start with www.arm.com You will find all the information you need about ARM processors there including the list of all ARM processor/MCU manufacturers. Good MCU to start with might be LPC2000 (ARM7) family from Philips. There is excellent Yahoo group just like this one but dedicated to LPC2000 MCUs. It's not quite 'multimedia oriented' MCU but it has great support. For real multimedia applications you might be interested in new LPC3000 family (ARM9) which should be available in Q2/2005. Also, you might want to check what 'Nexperia' (from Philips) is. Please note that if you have no previous experience with processors/MCUs you will find dealing with ARM processors (32-bit architecture) very difficult in the beginning. In that case, starting with PIC (or any other 8-bit architecture) might be good idea. Regards, Igor -- No virus found in this outgoing message. Checked by AVG Anti-Virus. Version: 7.0.300 / Virus Database: 266.4.0 - Release Date: 22.02.2005. |
(You need to be a member of piclist -- send a blank email to piclist-subscribe@yahoogroups.com )
Help needed badly - Basic Boost Circuit - Devon Lee - Feb 28 9:09:00 2005
|
Hi there, Would like to ask for you guys opinion regarding the boost circuit which is capable of stepping up the input voltage level to a higher level. Chiefly, I've done testing on a very basic boost circuit after the necessary calculation to obtain the component values. A 680uF capacitor, 470uH inductor and an operating frequency of 30kHz. These are the values obtained through calculation. As attached in the "File" is the basic boost circuit. However, while testing the circuit with a 50% duty cycle, I obtain the following: V_input = 3V and V_out = 35V Mind to give some advice on what are the matters that I should consider checking here? I manage to turn ON and OFF the MOSFET well. And it seems that I will only be able to boost up to the appropriate level with a 50% duty cycle at 2200kHz from the function generator. Help needed. Real lost. __________________________________ |
(You need to be a member of piclist -- send a blank email to piclist-subscribe@yahoogroups.com )
Re: Help needed badly - Basic Boost Circuit - Leon Heller - Feb 28 9:28:00 2005
|
----- Original Message ----- From: "Devon Lee" <> To: <> Sent: Monday, February 28, 2005 1:09 PM Subject: [piclist] Help needed badly - Basic Boost Circuit > > Hi there, > > Would like to ask for you guys opinion regarding the > boost circuit which is capable of stepping up the > input voltage level to a higher level. > > Chiefly, I've done testing on a very basic boost > circuit after the necessary calculation to obtain the > component values. A 680uF capacitor, 470uH inductor > and an operating frequency of 30kHz. These are the > values obtained through calculation. As attached in > the "File" is the basic boost circuit. > > However, while testing the circuit with a 50% duty > cycle, I obtain the following: > > V_input = 3V and V_out = 35V > > Mind to give some advice on what are the matters that > I should consider checking here? I manage to turn ON > and OFF the MOSFET well. And it seems that I will only > be able to boost up to the appropriate level with a > 50% duty cycle at 2200kHz from the function generator. > > Help needed. Real lost. I don't see the problem, if you are getting 35V out it seems to be working OK. What is the load? Leon -- Leon Heller, G1HSM http://www.geocities.com/leon_heller -- No virus found in this outgoing message. Checked by AVG Anti-Virus. Version: 7.0.300 / Virus Database: 266.5.1 - Release Date: 27/02/2005 |
|
|
(You need to be a member of piclist -- send a blank email to piclist-subscribe@yahoogroups.com )
Re: Help needed badly - Basic Boost Circuit - Devon Lee - Feb 28 10:18:00 2005
|
Hi there, Thanks for your reply. About the boost circuit, I didn't apply any load at the output. I was thinking that I should be getting a 5V to 6V output since my input is 3V. I guess I need a proper load then. Mind if I were to ask about the load. Is there a way where I can use a load, something like the value of a resistor to represent my load? Advice needed. And since my load of the circuit my vary. Does it mean that I will not necessary get a 6V from 3V if I were to boost up at 50% duty cycle? Does it mean that the 6V is the minimum output voltage that I will obtain? Sorry for asking such minor and simple stuffs, really need help here. Mind guiding? Thanks a lot in advance. --- Leon Heller <> wrote: > ----- Original Message ----- > From: "Devon Lee" <> > To: <> > Sent: Monday, February 28, 2005 1:09 PM > Subject: [piclist] Help needed badly - Basic Boost > Circuit > > > > Hi there, > > > > Would like to ask for you guys opinion regarding > the > > boost circuit which is capable of stepping up the > > input voltage level to a higher level. > > > > Chiefly, I've done testing on a very basic boost > > circuit after the necessary calculation to obtain > the > > component values. A 680uF capacitor, 470uH > inductor > > and an operating frequency of 30kHz. These are the > > values obtained through calculation. As attached > in > > the "File" is the basic boost circuit. > > > > However, while testing the circuit with a 50% duty > > cycle, I obtain the following: > > > > V_input = 3V and V_out = 35V > > > > Mind to give some advice on what are the matters > that > > I should consider checking here? I manage to turn > ON > > and OFF the MOSFET well. And it seems that I will > only > > be able to boost up to the appropriate level with > a > > 50% duty cycle at 2200kHz from the function > generator. > > > > Help needed. Real lost. > > I don't see the problem, if you are getting 35V out > it seems to be working > OK. What is the load? > > Leon > -- > Leon Heller, G1HSM > http://www.geocities.com/leon_heller > > -- > No virus found in this outgoing message. > Checked by AVG Anti-Virus. > Version: 7.0.300 / Virus Database: 266.5.1 - Release > Date: 27/02/2005 __________________________________ |
(You need to be a member of piclist -- send a blank email to piclist-subscribe@yahoogroups.com )
Re: Help needed badly - Basic Boost Circuit - rooster_0429 - Feb 28 10:40:00 2005
|
Hi, I'm an electrical engineer and I was looking at your circuit. I'm not exactly sure what you have it in mind for but I think that maybe you should look into using an op amp circuit. They are much easier to design for and much easier to calibrate for a specific gain. Plus they will work the same for a square wave as they do for a constant voltage signal. Look at the LM741 or there is another one the LM386. Its an audio amplifier that would be appropriate for higher current levels. Heres a tip if you decide to go this route the best way to get a stable gain for a small signal is to use two inverting opamp circuits. --- In , Devon Lee <devonsc@y...> wrote: > Hi there, > > Would like to ask for you guys opinion regarding the > boost circuit which is capable of stepping up the > input voltage level to a higher level. > > Chiefly, I've done testing on a very basic boost > circuit after the necessary calculation to obtain the > component values. A 680uF capacitor, 470uH inductor > and an operating frequency of 30kHz. These are the > values obtained through calculation. As attached in > the "File" is the basic boost circuit. > > However, while testing the circuit with a 50% duty > cycle, I obtain the following: > > V_input = 3V and V_out = 35V > > Mind to give some advice on what are the matters that > I should consider checking here? I manage to turn ON > and OFF the MOSFET well. And it seems that I will only > be able to boost up to the appropriate level with a > 50% duty cycle at 2200kHz from the function generator. > > Help needed. Real lost. > > __________________________________ |
(You need to be a member of piclist -- send a blank email to piclist-subscribe@yahoogroups.com )
Re: Minor Question On PIC Code - Paul James E. - Mar 1 7:17:00 2005
|
Devon, No, not in this case because decimal 2 (2) and hex 2 (0x02) are the same value. But if for instance you put decimal 20 (20) when you meant hex 20 (0x20), or vice versa, there would be a problem. A problem because decimal 20 means 20. However hex 20 means 32 decimal. ie 16 x 2 = 32. Hope this helps you out. Regards, Jim > Hi there, > > Would likw to ask some minor stuffs about PIC > programming. Sorry, slow learner here. Thanks in > advance. > > Regarding=> > > BSF STATUS,RP0 > MOVLW B'00100000' > MOVWF PR2 > BCF TRISC,0x02 ;Line A > BCF STATUS,RP0 > > And=> > > BSF STATUS,RP0 > MOVLW B'00100000' > MOVWF PR2 > BCF TRISC,2 ;Line B > BCF STATUS,RP0 > > Does line A and B make a difference? Real sorry if > this is a dumb question. > > __________________________________ > to unsubscribe, go to http://www.yahoogroups.com and follow the > instructions Yahoo! Groups Links |
(You need to be a member of piclist -- send a blank email to piclist-subscribe@yahoogroups.com )
Minor Question On PIC Code - Devon Lee - Mar 1 19:04:00 2005
|
Hi there, Would likw to ask some minor stuffs about PIC programming. Sorry, slow learner here. Thanks in advance. Regarding=> BSF STATUS,RP0 MOVLW B'00100000' MOVWF PR2 BCF TRISC,0x02 ;Line A BCF STATUS,RP0 And=> BSF STATUS,RP0 MOVLW B'00100000' MOVWF PR2 BCF TRISC,2 ;Line B BCF STATUS,RP0 Does line A and B make a difference? Real sorry if this is a dumb question. __________________________________ |
|
|
(You need to be a member of piclist -- send a blank email to piclist-subscribe@yahoogroups.com )
Another Minor Question On PIC Code - Devon Lee - Mar 1 19:26:00 2005
|
Hi Jim, Thanks a lot for your explanation. Would like to ask about something regarding PIC Code again. Hope you guys dont mind. I intend to use 2 ADC input pin, thus, I set up as shown in the following: However, I couldnt get the program to run as in it doesnt go any further after it reaches Line A (as shown in the following), where it keeps on looping in "Check2". I've done this checking using the MPSIM, by the way. Is there anything that I've missed out where I should add-on? Advice really needed. Thanks in advance. **************************************************** ;INITIALIZE ADC START: BSF STATUS,RP0 MOVLW B'10001001' MOVWF ADCON1 BCF STATUS,RP0 AC: MOVLW B'01000001' ;INTEND TO USE AN0 MOVWF ADCON0 BSF ADCON0,GO_DONE CHECK1: BTFSC ADCON0,GO_DONE GOTO CHECK1 MOVF ADRESH,W MOVWF RESULTHIGH1 BSF STATUS,RP0 MOVF ADRESL,W BCF STATUS,RP0 MOVWF RESULTLOW1 RETURN PANEL: MOVLW B'01000010' ;INTEND TO USE AN1 MOVWF ADCON0 BSF ADCON0,GO_DONE CHECK2: BTFSC ADCON0,GO_DONE GOTO CHECK2 ;LINE A,DOESNT PROCEED MOVF ADRESH,W MOVWF RESULTHIGH2 BSF STATUS,RP0 MOVF ADRESL,W BCF STATUS,RP0 MOVWF RESULTLOW2 RETURN __________________________________ |
|
|
Re: Another Minor Question On PIC Code
Re: Another Minor Question On PIC Code
Re: Another Minor Question On PIC Code
(You need to be a member of piclist -- send a blank email to piclist-subscribe@yahoogroups.com )
Re: Another Minor Question On PIC Code - Eirik Karlsen - Mar 1 20:01:00 2005
|
How did you plan on getting to
PANEL or CHECK2 ? there are no branches to take the execution over there... Devon Lee wrote: Hi Jim, --
| |||
| |||
|
(You need to be a member of piclist -- send a blank email to piclist-subscribe@yahoogroups.com )
Re: Another Minor Question On PIC Code - Eirik Karlsen - Mar 1 20:04:00 2005
|
However if as you say you got in there and it keeps looping this can only
be because
the ADC is already DONE (you have not restarted it) or the DAC is disabled by some other means. Eirik Karlsen wrote: How did you plan on getting to --
|
(You need to be a member of piclist -- send a blank email to piclist-subscribe@yahoogroups.com )
Re: Another Minor Question On PIC Code - Eirik Karlsen - Mar 1 20:06:00 2005
|
Uh... disregard that one (its getting a bit late...) Eirik Karlsen wrote: > However if as you say you got in there and it keeps looping this can only be because > the ADC is already DONE (you have not restarted it) or the DAC is disabled by some > other means. > Eirik Karlsen wrote: > > > How did you plan on getting to > > PANEL or CHECK2 ? > > there are no branches to take the execution over there... > > > > > > Devon Lee wrote: > > > >> Hi Jim, > >> > >> Thanks a lot for your explanation. > >> > >> Would like to ask about something regarding PIC Code > >> again. Hope you guys dont mind. > >> > >> I intend to use 2 ADC input pin, thus, I set up as > >> shown in the following: > >> > >> However, I couldnt get the program to run as in it > >> doesnt go any further after it reaches Line A (as > >> shown in the following), where it keeps on looping in > >> "Check2". I've done this checking using the MPSIM, by > >> the way. Is there anything that I've missed out where > >> I should add-on? Advice really needed. Thanks in > >> advance. > >> > >> > >> **************************************************** > >> ;INITIALIZE ADC > >> > >> START: > >> BSF STATUS,RP0 > >> MOVLW B'10001001' > >> MOVWF ADCON1 > >> BCF STATUS,RP0 > >> > >> AC: > >> MOVLW B'01000001' ;INTEND TO USE AN0 > >> MOVWF ADCON0 > >> BSF ADCON0,GO_DONE > >> > >> CHECK1: > >> BTFSC ADCON0,GO_DONE > >> GOTO CHECK1 > >> MOVF ADRESH,W > >> MOVWF RESULTHIGH1 > >> BSF STATUS,RP0 > >> MOVF ADRESL,W > >> BCF STATUS,RP0 > >> MOVWF RESULTLOW1 > >> RETURN > >> > >> PANEL: > >> MOVLW B'01000010' ;INTEND TO USE AN1 > >> MOVWF ADCON0 > >> BSF ADCON0,GO_DONE > >> > >> CHECK2: > >> BTFSC ADCON0,GO_DONE > >> GOTO CHECK2 ;LINE A,DOESNT PROCEED > >> MOVF ADRESH,W > >> MOVWF RESULTHIGH2 > >> BSF STATUS,RP0 > >> MOVF ADRESL,W > >> BCF STATUS,RP0 > >> MOVWF RESULTLOW2 > >> RETURN > >> > >> > >> > >> > >> __________________________________ > >> > >> > >> to unsubscribe, go to http://www.yahoogroups.com and follow the instructions > >> > >> > >> > > > > -- > > ******************************************* > > VISIT MY HOME PAGE: > > <http://home.online.no/~eikarlse/index.htm> > > LAST UPDATED: 23/08/2003 > > ******************************************* > > Regards > > Eirik Karlsen > > > > -- > ******************************************* > VISIT MY HOME PAGE: > <http://home.online.no/~eikarlse/index.htm> > LAST UPDATED: 23/08/2003 > ******************************************* > Regards > Eirik Karlsen > to unsubscribe, go to http://www.yahoogroups.com and follow the instructions > > Yahoo! Groups Sponsor > ADVERTISEMENT > [click here] > > Yahoo! Groups Links > > * To -- ******************************************* VISIT MY HOME PAGE: <http://home.online.no/~eikarlse/index.htm> LAST UPDATED: 23/08/2003 ******************************************* Regards Eirik Karlsen |
|
|
(You need to be a member of piclist -- send a blank email to piclist-subscribe@yahoogroups.com )
Re: Another Minor Question On PIC Code - Devon Lee - Mar 1 20:18:00 2005
|
Oh no...mind guiding me, please? But I've tried to initialize everything again by putting the initialization code for the ADCON1 before I proceed to the "PANEL" portion. And yet, it still loops again and again at the "CHECK2". Mind giving me some advice? Please? > Eirik Karlsen wrote: > > > However if as you say you got in there and it > keeps looping this can only be because > > the ADC is already DONE (you have not restarted > it) or the DAC is disabled by some > > other means. > > > > > > Eirik Karlsen wrote: > > > > > How did you plan on getting to > > > PANEL or CHECK2 ? > > > there are no branches to take the execution over > there... > > > > > > > > > Devon Lee wrote: > > > > > >> Hi Jim, > > >> > > >> Thanks a lot for your explanation. > > >> > > >> Would like to ask about something regarding PIC > Code > > >> again. Hope you guys dont mind. > > >> > > >> I intend to use 2 ADC input pin, thus, I set up > as > > >> shown in the following: > > >> > > >> However, I couldnt get the program to run as in > it > > >> doesnt go any further after it reaches Line A > (as > > >> shown in the following), where it keeps on > looping in > > >> "Check2". I've done this checking using the > MPSIM, by > > >> the way. Is there anything that I've missed out > where > > >> I should add-on? Advice really needed. Thanks > in > > >> advance. > > >> > > >> > > >> > **************************************************** > > >> ;INITIALIZE ADC > > >> > > >> START: > > >> BSF STATUS,RP0 > > >> MOVLW B'10001001' > > >> MOVWF ADCON1 > > >> BCF STATUS,RP0 > > >> > > >> AC: > > >> MOVLW B'01000001' ;INTEND TO > USE AN0 > > >> MOVWF ADCON0 > > >> BSF ADCON0,GO_DONE > > >> > > >> CHECK1: > > >> BTFSC ADCON0,GO_DONE > > >> GOTO CHECK1 > > >> MOVF ADRESH,W > > >> MOVWF RESULTHIGH1 > > >> BSF STATUS,RP0 > > >> MOVF ADRESL,W > > >> BCF STATUS,RP0 > > >> MOVWF RESULTLOW1 > > >> RETURN > > >> > > >> PANEL: > > >> MOVLW B'01000010' ;INTEND TO > USE AN1 > > >> MOVWF ADCON0 > > >> BSF ADCON0,GO_DONE > > >> > > >> CHECK2: > > >> BTFSC ADCON0,GO_DONE > > >> GOTO CHECK2 ;LINE > A,DOESNT PROCEED > > >> MOVF ADRESH,W > > >> MOVWF RESULTHIGH2 > > >> BSF STATUS,RP0 > > >> MOVF ADRESL,W > > >> BCF STATUS,RP0 > > >> MOVWF RESULTLOW2 > > >> RETURN > > >> > > >> > > >> > > >> > > >> __________________________________ > > >> > > >> > > >> > > >> to unsubscribe, go to > http://www.yahoogroups.com and follow the > instructions > > >> > > >> > > >> > > > > > > -- > > > ******************************************* > > > VISIT MY HOME PAGE: > > > <http://home.online.no/~eikarlse/index.htm> > > > LAST UPDATED: 23/08/2003 > > > ******************************************* > > > Regards > > > Eirik Karlsen > > > > > > > -- > > ******************************************* > > VISIT MY HOME PAGE: > > <http://home.online.no/~eikarlse/index.htm> > > LAST UPDATED: 23/08/2003 > > ******************************************* > > Regards > > Eirik Karlsen > > > > > > to unsubscribe, go to http://www.yahoogroups.com > and follow the instructions > > > > Yahoo! Groups Sponsor > > ADVERTISEMENT > > [click here] > > > > > > > > Yahoo! Groups Links > > > > * To > > -- > ******************************************* > VISIT MY HOME PAGE: > <http://home.online.no/~eikarlse/index.htm> > LAST UPDATED: 23/08/2003 > ******************************************* > Regards > Eirik Karlsen __________________________________ |
(You need to be a member of piclist -- send a blank email to piclist-subscribe@yahoogroups.com )
Re: Again, Another Minor Question On PIC Code - Paul James E. - Mar 1 23:15:00 2005
|
Devon, This will not change them from their power up values. All port pins power up as inputs. Writing a '1' to an TRIS register makes that pin an input. To make a pin an output, you have to write a '0' for that pin to the tris register. Also not that PORTA is not a full 8 bits wide. I believe on this part PORTA is 6 bits wide. The 2 MSB's will read as '0'. Change your B'11111111' to B'00000000' and all should work as you intend. At least the Port will. Regards, Jim > > Hi there, > > I tried simulating this portion of the code, I'm using > PIC 16F876. > BSF STATUS,RP0 > MOVLW B'11111111' > MOVWF TRISA > BCF STATUS,RP0 > To enable the Port A to function as an output port. > However, through the simulation (MPSIM), the values in > TRISA register does not change to '11111111'. Mind to > comment about this? Please? Thanks in advance. I've > checked the bank and it seems that TRISA is in Bank1. > > Mind helping? Please? I tried doing the same thing to > TRISB and TRISC and it works. Meaning, I'm able to >store the desired value into TRISB and TRISC. > > > __________________________________ > Celebrate Yahoo!'s 10th Birthday! > Yahoo! Netrospective: 100 Moments of the Web > http://birthday.yahoo.com/netrospective/ > to unsubscribe, go to http://www.yahoogroups.com and follow the > instructions Yahoo! Groups Links |
(You need to be a member of piclist -- send a blank email to piclist-subscribe@yahoogroups.com )
Re: Another Minor Question On PIC Code - john - Mar 2 1:13:00 2005
|
It looks like you typed in the value wrong. You have the ADC module turned off in the panel function. Your assigning B'01000010' to ADCON0 in panel but in AC you assign B'01000001' to ADCON0. bit zero needs to be set to turn on the adc. --- In , Devon Lee <devonsc@y...> wrote: > Hi Jim, > > Thanks a lot for your explanation. > > Would like to ask about something regarding PIC Code > again. Hope you guys dont mind. > > I intend to use 2 ADC input pin, thus, I set up as > shown in the following: > > However, I couldnt get the program to run as in it > doesnt go any further after it reaches Line A (as > shown in the following), where it keeps on looping in > "Check2". I've done this checking using the MPSIM, by > the way. Is there anything that I've missed out where > I should add-on? Advice really needed. Thanks in > advance. > **************************************************** > ;INITIALIZE ADC > > START: > BSF STATUS,RP0 > MOVLW B'10001001' > MOVWF ADCON1 > BCF STATUS,RP0 > > AC: > MOVLW B'01000001' ;INTEND TO USE AN0 > MOVWF ADCON0 > BSF ADCON0,GO_DONE > > CHECK1: > BTFSC ADCON0,GO_DONE > GOTO CHECK1 > MOVF ADRESH,W > MOVWF RESULTHIGH1 > BSF STATUS,RP0 > MOVF ADRESL,W > BCF STATUS,RP0 > MOVWF RESULTLOW1 > RETURN > > PANEL: > MOVLW B'01000010' ;INTEND TO USE AN1 > MOVWF ADCON0 > BSF ADCON0,GO_DONE > > CHECK2: > BTFSC ADCON0,GO_DONE > GOTO CHECK2 ;LINE A,DOESNT PROCEED > MOVF ADRESH,W > MOVWF RESULTHIGH2 > BSF STATUS,RP0 > MOVF ADRESL,W > BCF STATUS,RP0 > MOVWF RESULTLOW2 > RETURN > > > __________________________________ |
(You need to be a member of piclist -- send a blank email to piclist-subscribe@yahoogroups.com )
Re: Re: Another Minor Question On PIC Code - Devon Lee - Mar 2 4:07:00 2005
|
Hi John, Thank you so so much, John. Thanks for correcting me. I refer to the datasheet to check again and it seems that I've mistaken and thought by writing B'01000010' means selecting AN1, which is not. Thanks a lot! --- john <> wrote: > It looks like you typed in the value wrong. > You have the ADC module turned off in the panel > function. > Your assigning B'01000010' to ADCON0 in panel > but in AC you assign B'01000001' to ADCON0. bit zero > needs to be > set to turn on the adc. > > --- In , Devon Lee > <devonsc@y...> wrote: > > Hi Jim, > > > > Thanks a lot for your explanation. > > > > Would like to ask about something regarding PIC > Code > > again. Hope you guys dont mind. > > > > I intend to use 2 ADC input pin, thus, I set up as > > shown in the following: > > > > However, I couldnt get the program to run as in it > > doesnt go any further after it reaches Line A (as > > shown in the following), where it keeps on looping > in > > "Check2". I've done this checking using the MPSIM, > by > > the way. Is there anything that I've missed out > where > > I should add-on? Advice really needed. Thanks in > > advance. > > > > > > > **************************************************** > > ;INITIALIZE ADC > > > > START: > > BSF STATUS,RP0 > > MOVLW B'10001001' > > MOVWF ADCON1 > > BCF STATUS,RP0 > > > > AC: > > MOVLW B'01000001' ;INTEND TO USE AN0 > > MOVWF ADCON0 > > BSF ADCON0,GO_DONE > > > > CHECK1: > > BTFSC ADCON0,GO_DONE > > GOTO CHECK1 > > MOVF ADRESH,W > > MOVWF RESULTHIGH1 > > BSF STATUS,RP0 > > MOVF ADRESL,W > > BCF STATUS,RP0 > > MOVWF RESULTLOW1 > > RETURN > > > > PANEL: > > MOVLW B'01000010' ;INTEND TO USE AN1 > > MOVWF ADCON0 > > BSF ADCON0,GO_DONE > > > > CHECK2: > > BTFSC ADCON0,GO_DONE > > GOTO CHECK2 ;LINE A,DOESNT PROCEED > > MOVF ADRESH,W > > MOVWF RESULTHIGH2 > > BSF STATUS,RP0 > > MOVF ADRESL,W > > BCF STATUS,RP0 > > MOVWF RESULTLOW2 > > RETURN > > > > > > > > > > __________________________________ > __________________________________ Celebrate Yahoo!'s 10th Birthday! Yahoo! Netrospective: 100 Moments of the Web http://birthday.yahoo.com/netrospective/ |
(You need to be a member of piclist -- send a blank email to piclist-subscribe@yahoogroups.com )
Again, Another Minor Question On PIC Code - Devon Lee - Mar 2 10:33:00 2005
|
Hi there, I tried simulating this portion of the code, I'm using PIC 16F876. BSF STATUS,RP0 MOVLW B'11111111' MOVWF TRISA BCF STATUS,RP0 To enable the Port A to function as an output port. However, through the simulation (MPSIM), the values in TRISA register does not change to '11111111'. Mind to comment about this? Please? Thanks in advance. I've checked the bank and it seems that TRISA is in Bank1. Mind helping? Please? I tried doing the same thing to TRISB and TRISC and it works. Meaning, I'm able to store the desired value into TRISB and TRISC. __________________________________ Celebrate Yahoo!'s 10th Birthday! Yahoo! Netrospective: 100 Moments of the Web http://birthday.yahoo.com/netrospective/ |
|
|
(You need to be a member of piclist -- send a blank email to piclist-subscribe@yahoogroups.com )
Re: Again, Another Minor Question On PIC Code - Devon Lee - Mar 2 11:40:00 2005
|
Hi there, Thanks a lot, Jim. I got it. Sorry for not reading up well enough. Thanks again. --- "Paul James E." <> wrote: > Devon, > > This will not change them from their power up > values. All port pins > power up as inputs. Writing a '1' to an TRIS > register makes that pin > an input. To make a pin an output, you have to > write a '0' for that > pin to the tris register. Also not that PORTA is > not a full 8 bits wide. > I believe on this part PORTA is 6 bits wide. The 2 > MSB's will read as '0'. > Change your B'11111111' to B'00000000' and all > should work as you intend. > At least the Port will. > > Regards, > Jim > > > > > Hi there, > > > > I tried simulating this portion of the code, I'm > using > > PIC 16F876. > > > > > > BSF STATUS,RP0 > > MOVLW B'11111111' > > MOVWF TRISA > > BCF STATUS,RP0 > > > > > > To enable the Port A to function as an output > port. > > However, through the simulation (MPSIM), the > values in > > TRISA register does not change to '11111111'. Mind > to > > comment about this? Please? Thanks in advance. > I've > > checked the bank and it seems that TRISA is in > Bank1. > > > > Mind helping? Please? I tried doing the same thing > to > > TRISB and TRISC and it works. Meaning, I'm able to > >store the desired value into TRISB and TRISC. > > > > > > > > > > __________________________________ > > Celebrate Yahoo!'s 10th Birthday! > > Yahoo! Netrospective: 100 Moments of the Web > > http://birthday.yahoo.com/netrospective/ > > > > > > to unsubscribe, go to http://www.yahoogroups.com > and follow the > > instructions Yahoo! Groups Links > > > > > > > __________________________________ Celebrate Yahoo!'s 10th Birthday! Yahoo! Netrospective: 100 Moments of the Web http://birthday.yahoo.com/netrospective/ |
(You need to be a member of piclist -- send a blank email to piclist-subscribe@yahoogroups.com )
Re: Again, Another Minor Question On PIC Code - Igor Janjatovic - Mar 2 12:37:00 2005
|
> I tried simulating this portion of the code, I'm using > PIC 16F876. You might have trouble with ADC module. PORTA pins are by default analog inputs. Read data sheet section which explains ADC module and you'll see that first you need to configure PORTA pins as digital pins (not analog) and then you can set TRISA register. Let me know if it works. Regards, Igor -- No virus found in this outgoing message. Checked by AVG Anti-Virus. Version: 7.0.300 / Virus Database: 266.5.4 - Release Date: 01.03.2005. |
(You need to be a member of piclist -- send a blank email to piclist-subscribe@yahoogroups.com )
Again Help Needed, Another Minor Question On PIC Code - Devon Lee - Mar 3 14:37:00 2005
|
Hi there, Guess I've asked this before but hope you guys dont mind guiding me again. I still dont get the ADC code run well. Did I miss out any of the comments given by you guys? It seems that the ADC code turn ON all the LEDs and they remain ON at all times, no matter what voltage is being applied to the analogue input. Mind to comment about it? Help needed. Thanks in advance. PIC Code=> LIST P=16F876 #INCLUDE "P16F876.INC" __CONFIG _CP_OFF & _XT_OSC & _WDT_OFF & _PWRTE_ON & _LVP_OFF & _BODEN_ON ERRORLEVEL -306, -302 ;MAIN PROGRAM 1 - BOOST ORG 0X00 GOTO START RESULTHIGH1 EQU 24H RESULTLOW1 EQU 25H RESULTHIGH2 EQU 26H RESULTLOW2 EQU 27H ;************************************************************************** ;TEST ADC READINGS START: BSF STATUS,RP0 MOVLW B'00000000' MOVWF TRISC BCF STATUS,RP0 ;************************************************************************** ;INITIALIZATION FOR ADC1 AND ADC2 (PORT A) ;ADC1 IS FOR FEEDBACK FROM BATTERY ;ADC2 IS FOR FEEDBACK FROM SOLAR PANEL BSF STATUS,RP0 MOVLW B'10001001' MOVWF ADCON1 BCF STATUS,RP0 ;************************************************************************** ;START CHECK RESTART: CALL ADC1 ;FEEDBACK FROM BATTERY BTFSC RESULTLOW1,0 BSF PORTC,0 BTFSC RESULTLOW1,1 BSF PORTC,1 BTFSC RESULTLOW1,2 BSF PORTC,2 BTFSC RESULTLOW1,3 BSF PORTC,3 BTFSC RESULTLOW1,4 BSF PORTC,4 BTFSC RESULTLOW1,5 BSF PORTC,5 BTFSC RESULTLOW1,6 BSF PORTC,6 BTFSC RESULTLOW1,7 BSF PORTC,7 GOTO RESTART ;************************************************************************** ;READ BATTERY VOLTAGE LEVEL (AN0) ADC1: MOVLW B'01000001' MOVWF ADCON0 BSF ADCON0,GO_DONE CHECK1: BTFSC ADCON0,GO_DONE GOTO CHECK1 MOVF ADRESH,W MOVWF RESULTHIGH1 BSF STATUS,RP0 MOVF ADRESL,W BCF STATUS,RP0 MOVWF RESULTLOW1 RETURN END __________________________________ Celebrate Yahoo!'s 10th Birthday! Yahoo! Netrospective: 100 Moments of the Web http://birthday.yahoo.com/netrospective/ |
|
|
Re: Again Help Needed, Another Minor Question On PIC Code
(You need to be a member of piclist -- send a blank email to piclist-subscribe@yahoogroups.com )
Re: Again Help Needed, Another Minor Question On PIC Code - john - Mar 3 15:13:00 2005
|
You need to clear the Port Bits. Once the bits get set they will stay that way unless you add code to clear the port bit when the bit in RESULTLOW1 is zero. --- In , Devon Lee <devonsc@y...> wrote: > Hi there, > > Guess I've asked this before but hope you guys dont > mind guiding me again. I still dont get the ADC code > run well. Did I miss out any of the comments given by > you guys? > > It seems that the ADC code turn ON all the LEDs and > they remain ON at all times, no matter what voltage is > being applied to the analogue input. > > Mind to comment about it? Help needed. Thanks in > advance. > > PIC Code=> > > LIST P=16F876 > #INCLUDE "P16F876.INC" > __CONFIG _CP_OFF & _XT_OSC & _WDT_OFF & _PWRTE_ON & > _LVP_OFF & _BODEN_ON > ERRORLEVEL -306, -302 > > ;MAIN PROGRAM 1 - BOOST > > ORG 0X00 > GOTO START > > RESULTHIGH1 EQU 24H > RESULTLOW1 EQU 25H > RESULTHIGH2 EQU 26H > RESULTLOW2 EQU 27H > > ;****************************************************************** ******** > ;TEST ADC READINGS > > START: > BSF STATUS,RP0 > MOVLW B'00000000' > MOVWF TRISC > BCF STATUS,RP0 > > ;****************************************************************** ******** > ;INITIALIZATION FOR ADC1 AND ADC2 (PORT A) > ;ADC1 IS FOR FEEDBACK FROM BATTERY > ;ADC2 IS FOR FEEDBACK FROM SOLAR PANEL > > BSF STATUS,RP0 > MOVLW B'10001001' > MOVWF ADCON1 > BCF STATUS,RP0 > > ;****************************************************************** ******** > ;START CHECK > > RESTART: > CALL ADC1 ;FEEDBACK FROM BATTERY > BTFSC RESULTLOW1,0 > BSF PORTC,0 > BTFSC RESULTLOW1,1 > BSF PORTC,1 > BTFSC RESULTLOW1,2 > BSF PORTC,2 > BTFSC RESULTLOW1,3 > BSF PORTC,3 > BTFSC RESULTLOW1,4 > BSF PORTC,4 > BTFSC RESULTLOW1,5 > BSF PORTC,5 > BTFSC RESULTLOW1,6 > BSF PORTC,6 > BTFSC RESULTLOW1,7 > BSF PORTC,7 > GOTO RESTART > > ;****************************************************************** ******** > ;READ BATTERY VOLTAGE LEVEL (AN0) > > ADC1: > MOVLW B'01000001' > MOVWF ADCON0 > BSF ADCON0,GO_DONE > > CHECK1: > BTFSC ADCON0,GO_DONE > GOTO CHECK1 > MOVF ADRESH,W > MOVWF RESULTHIGH1 > BSF STATUS,RP0 > MOVF ADRESL,W > BCF STATUS,RP0 > MOVWF RESULTLOW1 > RETURN > END > __________________________________ > Celebrate Yahoo!'s 10th Birthday! > Yahoo! Netrospective: 100 Moments of the Web > http://birthday.yahoo.com/netrospective/ |
|
|
(You need to be a member of piclist -- send a blank email to piclist-subscribe@yahoogroups.com )
Re: Re: Again Help Needed, Another Minor Question On PIC Code - Devon Lee - Mar 3 15:17:00 2005
|
Hi there, Thanks a lot. Mind if I were to ask if....if there is anything else that I should consider changing? Just to ask in advance so I can try them out in the lab later. Sorry for asking such minor problems. Thanks a lot in advance. So, are the following changes alright? Hope you dont mind me posting the code again => LIST P=16F876 #INCLUDE "P16F876.INC" __CONFIG _CP_OFF & _XT_OSC & _WDT_OFF & _PWRTE_ON & _LVP_OFF & _BODEN_ON ERRORLEVEL -306, -302 ;MAIN PROGRAM 1 - BOOST ORG 0X00 GOTO START RESULTHIGH1 EQU 24H RESULTLOW1 EQU 25H RESULTHIGH2 EQU 26H RESULTLOW2 EQU 27H ;************************************************************************** ;TEST ADC READINGS START: BSF STATUS,RP0 MOVLW B'11111111' MOVWF TRISA MOVLW B'00000000' MOVWF TRISC BCF STATUS,RP0 ;************************************************************************** ;INITIALIZATION FOR ADC1 AND ADC2 (PORT A) ;ADC1 IS FOR FEEDBACK FROM BATTERY ;ADC2 IS FOR FEEDBACK FROM SOLAR PANEL BSF STATUS,RP0 MOVLW B'10001001' MOVWF ADCON1 BCF STATUS,RP0 ;************************************************************************** ;START CHECK RESTART: CLRF RESULTLOW1 CALL ADC1 ;FEEDBACK FROM BATTERY MOVF RESULTLOW1,W MOVWF PORTC GOTO RESTART ;************************************************************************** ;READ BATTERY VOLTAGE LEVEL (AN0) ADC1: MOVLW B'01000001' MOVWF ADCON0 BSF ADCON0,GO_DONE CHECK1: BTFSC ADCON0,GO_DONE GOTO CHECK1 MOVF ADRESH,W MOVWF RESULTHIGH1 BSF STATUS,RP0 MOVF ADRESL,W BCF STATUS,RP0 MOVWF RESULTLOW1 RETURN END __________________________________ Celebrate Yahoo!'s 10th Birthday! Yahoo! Netrospective: 100 Moments of the Web http://birthday.yahoo.com/netrospective/ |
(You need to be a member of piclist -- send a blank email to piclist-subscribe@yahoogroups.com )
Re: Again Help Needed, Another Minor Question On PIC Code - rtstofer - Mar 3 15:23:00 2005
|
--- In , Devon Lee <devonsc@y...> wrote: > Hi there, > > Guess I've asked this before but hope you guys dont > mind guiding me again. I still dont get the ADC code > run well. Did I miss out any of the comments given by > you guys? > > It seems that the ADC code turn ON all the LEDs and > they remain ON at all times, no matter what voltage is > being applied to the analogue input. > > Mind to comment about it? Help needed. Thanks in > advance. > > PIC Code=> > > LIST P=16F876 > #INCLUDE "P16F876.INC" > __CONFIG _CP_OFF & _XT_OSC & _WDT_OFF & _PWRTE_ON & > _LVP_OFF & _BODEN_ON > ERRORLEVEL -306, -302 > > ;MAIN PROGRAM 1 - BOOST > > ORG 0X00 > GOTO START > > RESULTHIGH1 EQU 24H > RESULTLOW1 EQU 25H > RESULTHIGH2 EQU 26H > RESULTLOW2 EQU 27H > > ;****************************************************************** ******** > ;TEST ADC READINGS > > START: > BSF STATUS,RP0 > MOVLW B'00000000' > MOVWF TRISC You just set all the pins to OUTPUT - this means the A/D will read them as DIGITAL inputs, not ANALOG. Everything you need to know about the A2D is in chapter 23 of the MidRangeMPU manual available at www.microchip.com including the initialization code in section 23.13. The example doesn't show the requirement that the pins be INPUT - that is shown in 23.6 Or, download App Note 546 "Using The Analog To Digital Converter" and the related source code. > BCF STATUS,RP0 > > ;****************************************************************** ******** > ;INITIALIZATION FOR ADC1 AND ADC2 (PORT A) > ;ADC1 IS FOR FEEDBACK FROM BATTERY > ;ADC2 IS FOR FEEDBACK FROM SOLAR PANEL > > BSF STATUS,RP0 > MOVLW B'10001001' > MOVWF ADCON1 > BCF STATUS,RP0 > > ;****************************************************************** ******** > ;START CHECK > > RESTART: > CALL ADC1 ;FEEDBACK FROM BATTERY > BTFSC RESULTLOW1,0 > BSF PORTC,0 > BTFSC RESULTLOW1,1 > BSF PORTC,1 > BTFSC RESULTLOW1,2 > BSF PORTC,2 > BTFSC RESULTLOW1,3 > BSF PORTC,3 > BTFSC RESULTLOW1,4 > BSF PORTC,4 > BTFSC RESULTLOW1,5 > BSF PORTC,5 > BTFSC RESULTLOW1,6 > BSF PORTC,6 > BTFSC RESULTLOW1,7 > BSF PORTC,7 > GOTO RESTART > > ;****************************************************************** ******** > ;READ BATTERY VOLTAGE LEVEL (AN0) > > ADC1: > MOVLW B'01000001' > MOVWF ADCON0 > BSF ADCON0,GO_DONE > > CHECK1: > BTFSC ADCON0,GO_DONE > GOTO CHECK1 > MOVF ADRESH,W > MOVWF RESULTHIGH1 > BSF STATUS,RP0 > MOVF ADRESL,W > BCF STATUS,RP0 > MOVWF RESULTLOW1 > RETURN > END > __________________________________ > Celebrate Yahoo!'s 10th Birthday! > Yahoo! Netrospective: 100 Moments of the Web > http://birthday.yahoo.com/netrospective/ |
(You need to be a member of piclist -- send a blank email to piclist-subscribe@yahoogroups.com )
Re: Once Again Help Needed, Another Minor Question On PIC Code - Paul James E. - Mar 4 1:20:00 2005
|
Devon, My 2 cents worth is as follows.... 1. Make sure the period you are trying to time is commensurate with the timer you intend to use. ie with no prescaler TMR0 is ~256uS at 4 Mhz. 2. Bone up on interrupts as you'll no doubt want to use them in conjunction with the timer timouts. You could poll the timer, but interrupts are better and less likely to be missed, and definitely more repeatable. 3. Make sure you address ALL the registers associated with your timer of choice. Just so you cover all the options and choose the options you want. 4. Once you get a timer working like you want it to, experiment with some of the other options to see if you can make it work better, easier, faster, etc. if you have the time. This could conceivably improve the operation of your software or system. At a mininum it will facilitate your learning more about the part that if not used on this project, could be used on the next. 5. In conjunction with all the above, keep good notes and records. That way when a problem comes up, you can check your notes and records to see if you have had and/or solved it before. And if so, how. It saves you from reinventing the wheel. Hope this is what you wanted to hear. Regards, and Good Luck, Jim P.S. Let us know how you make out in your endeavors. > > Hi there, > > Thanks to everyone. Thank you so so much. Would like > to ask if you guys mind to give me some ideas on what > are the considerations that I first need to look into > while using the internal Timer (not sure which Timer > is it call yet) of a PIC 16F876 to run a timer? > > In the meantime, I will search for the application > notes from the Microchip website. By the way, the > application note on the ADC from Microchip was really > good. > > Thanks again. Hope you guys dont mind guiding me. > Thanks in advance. > > > __________________________________ > Celebrate Yahoo!'s 10th Birthday! > Yahoo! Netrospective: 100 Moments of the Web > http://birthday.yahoo.com/netrospective/ > to unsubscribe, go to http://www.yahoogroups.com and follow the > instructions Yahoo! Groups Links |
(You need to be a member of piclist -- send a blank email to piclist-subscribe@yahoogroups.com )
Once Again Help Needed, Another Minor Question On PIC Code - Devon Lee - Mar 4 10:59:00 2005
|
Hi there, Thanks to everyone. Thank you so so much. Would like to ask if you guys mind to give me some ideas on what are the considerations that I first need to look into while using the internal Timer (not sure which Timer is it call yet) of a PIC 16F876 to run a timer? In the meantime, I will search for the application notes from the Microchip website. By the way, the application note on the ADC from Microchip was really good. Thanks again. Hope you guys dont mind guiding me. Thanks in advance. __________________________________ Celebrate Yahoo!'s 10th Birthday! Yahoo! |