Why lcd controller is so important?

Started by Anonymous in comp.arch.embedded11 years ago 5 replies

I want to implement a monochromatic graphic display with an 8 bit micro....this display requires clock frequency of 10MHz max, and my micro is...

I want to implement a monochromatic graphic display with an 8 bit micro....this display requires clock frequency of 10MHz max, and my micro is used at 16MHz...Is impossible to drive this display without any controller?What do you think? Thanks


PLL Stability and Any Gotchas?

Started by David T. Ashley in comp.arch.embedded14 years ago 4 replies

Hi, We'll be using the PLL for the first time in a product, out of necessity (the micro only allows a crystal up to 8MHz, but we need a 32MHz...

Hi, We'll be using the PLL for the first time in a product, out of necessity (the micro only allows a crystal up to 8MHz, but we need a 32MHz clock). The PLL will also be clocking a CAN module within the microcontroller. I'd be grateful for insight into any of the following questions: a)How do long do PLL's take to start? b)Do PLL's ever fail to start? c)If there is more than on...


Performance of TCP/IP stacks

Started by Dejan in comp.arch.embedded14 years ago 9 replies

There are many freely available TCP/IP stakcs (OpenTCP, lwIP, ethernut etc.) as well as many commercial ones (NetX, CMX, ...) . I would...

There are many freely available TCP/IP stakcs (OpenTCP, lwIP, ethernut etc.) as well as many commercial ones (NetX, CMX, ...) . I would appreciate if you can comment on the performance of TCP connections (as well as UDP, if available). The type of micro used as well as CPU clock is also usefull. This is not a school project nor market survey. I simply want to see what can I expect from...


Need DSP recommendation

Started by Rahul Agarwal in comp.arch.embedded16 years ago 11 replies

Hi, I have been developing an application using a Microchip 18F452 with 40 Mhz clock. Unfortunately, it seems like the device is too slow for...

Hi, I have been developing an application using a Microchip 18F452 with 40 Mhz clock. Unfortunately, it seems like the device is too slow for the application and I need something faster. Hence I am asking for some recommendations. My application is the following. The processor is connected to an analog sensor. It needs to sample the sensor to a 10-bit digital value and transmit it bit-b...


FIFO hdl code

Started by Anonymous in comp.arch.embedded14 years ago 4 replies

Hi, I need to stream audio data and control info I2C out of my PC into some external hardware and was thinking of using a FIFO to deal with the...

Hi, I need to stream audio data and control info I2C out of my PC into some external hardware and was thinking of using a FIFO to deal with the different clock boundaries. I was wondering if anyone had some startup verilog code on FIFOs, I am using a Xilinx FPGA Thanks Ryan (ryan.pinto79@gmail.com)


Compiling source code question.

Started by Mike Burch in comp.arch.embedded11 years ago 7 replies

Hello Fella's I have built this clock project and it is now operational. In fact it works great. The author passed along the hex...

Hello Fella's I have built this clock project and it is now operational. In fact it works great. The author passed along the hex files to me to program it. And I was successful with it as well. But, I would like to change it to a 24 hour display and that will require just one small update in this code, http://www.kd7lmo.net/sourcecode/ClockMaster.c I would like to try thi...


CompactFlash + microcontroller weirdness

Started by H. Peter Anvin in comp.arch.embedded15 years ago 9 replies

Hello, I wanted to inquire if someone else has seen this kind of phenomenon before... I have a design (currently implemented in an FPGA)...

Hello, I wanted to inquire if someone else has seen this kind of phenomenon before... I have a design (currently implemented in an FPGA) which drives a CompactFlash from a microcontroller, specifically a T80 (Z80 clone) from opencores.org, with my own firmware. The clock frequency is 25 MHz. The weird part is that it reads all cards fine, but when it comes to writing I get some extr...


Chip to Sequentially Read Many Inputs ?

Started by B1ackwater in comp.arch.embedded14 years ago 13 replies

An embedded project I'm working on requires the ability to read the status of up to 64 input ports - but obviously I want to use as few of my...

An embedded project I'm working on requires the ability to read the status of up to 64 input ports - but obviously I want to use as few of my microcontroller pins as possible. Somewhere I heard of devices called 'sequencers' or something like that where you just feed it a clock signal and it turns on individual i/o pins in order and then wraps around to pin zero again (or is reset with a thi...


MSP430F2013 documentation frustration

Started by larwe in comp.arch.embedded13 years ago 8 replies

I have this love-hate relationship with TI's documentation. On one hand, once you understand a module, you can use it on any micro. On the other...

I have this love-hate relationship with TI's documentation. On one hand, once you understand a module, you can use it on any micro. On the other hand, the cross-referenced docs are usually inconsistent and /always/ very confusing. (I still haven't worked out how to connect, let alone use, the sigma-delta ADC, and every time I try to use a timer on an MSP430 I wind up playing with clock contro...


AT91R40008 - I2C question.

Started by Johnny in comp.arch.embedded15 years ago 2 replies

I was looking at the Atmel AT91R40008 for a new design. However I realised it dosen't support I2C. Does anyone have a recommendation about...

I was looking at the Atmel AT91R40008 for a new design. However I realised it dosen't support I2C. Does anyone have a recommendation about how to interface a real time clock, and maybe a serial eeprom. Is an I2C bus master a sensible approach, perhaps from Philips? The main objectives are low cost and good availbility. regards, Johnny.


Cheapest micro running linux?

Started by Andreas in comp.arch.embedded15 years ago 6 replies

Hi, I ask me what is the cheapest micro capable of running (?C)Linux. I know many ARMs, H8, Motorola Coldfire... Is there anything else? What...

Hi, I ask me what is the cheapest micro capable of running (?C)Linux. I know many ARMs, H8, Motorola Coldfire... Is there anything else? What derivat is suggested? No special needs for power consumption, clock/MIPS, integrated peripherials. Thanks! Andreas


Z8 Acclaim Power Consumption?

Started by Richard Saunders in comp.arch.embedded16 years ago 1 reply

I'm feeling stupid - I'm having difficulty finding power consumption info for the Z8 Acclaim devices. As far as I can see, the spec docs on...

I'm feeling stupid - I'm having difficulty finding power consumption info for the Z8 Acclaim devices. As far as I can see, the spec docs on the Zilog site have a big "TBD" printed where the graph of consumption vs. clock frequency is supposed to be. Can you point me in the right direction? Thanks!


why not just say I2C?

Started by tim in comp.arch.embedded15 years ago 10 replies

I am currently working with a range of peripherals whos control lines look remarkably like an I2C interface. The data sheets go into great...

I am currently working with a range of peripherals whos control lines look remarkably like an I2C interface. The data sheets go into great detail about how the data and clock line are used to communicate with the device and how it has an own 'address' so that you can differentiate it from other devices etc....... Why not just say that it's an I2C comptable device FFS. Do they have t...


Need Help w/ MSP430 UART Tx

Started by V Barker in comp.arch.embedded16 years ago 2 replies

Hi, I'm having trouble doing a simple character transmission on the MSP430F149 UART. I'm using SoftBaugh's ES149 eval board...

Hi, I'm having trouble doing a simple character transmission on the MSP430F149 UART. I'm using SoftBaugh's ES149 eval board w/ICC430 compiler. The board has a 32768 Hz clock. I've verifed that it runs through the program. When I probe at pin UTXD0 with an oscope, all I see is a high signal. Can anyone help? Thanks, Valerie #include void main() { //


i2c coding problem

Started by tanu in comp.arch.embedded13 years ago 1 reply

Hi all I am using ATmega128 controller and using i2c bus eeprom to increase its memory space . I have i2c header file in my codevision avr and...

Hi all I am using ATmega128 controller and using i2c bus eeprom to increase its memory space . I have i2c header file in my codevision avr and i used them and change that accordingly but when i m reading my eeprom i m geting nothing i think that my code is either not able to generate the clock pulse or not able to write the data into eeprom i m not getting ,how to genrate the clk ? #in...


Newbie with questions on AT91RM9200

Started by jtyler in comp.arch.embedded14 years ago 4 replies

Hi All, I have a few questions on implementation: P.S. I have read the manual closely. 1. How does the real time clock keep time during power...

Hi All, I have a few questions on implementation: P.S. I have read the manual closely. 1. How does the real time clock keep time during power cycles ? 2.I want to run my code in flash, i think these days it is fast enough, know it is only 16 bit and must use thumb mode on compiler. What othe problems will i not like ? 3. My RAM memory will be SRAM which again is only 16 bit and must b ba...


Any OMAP developers on this group?

Started by Jonatan Fernstad in comp.arch.embedded16 years ago 1 reply

Hi, I am working on a software project that targets several devices equipped with different TI OMAP CPU's. One of the devices are giving me...

Hi, I am working on a software project that targets several devices equipped with different TI OMAP CPU's. One of the devices are giving me a hard time, and I cant figure out what I might be doing wrong on this particular device. For an OMAP expert with good knowledge about power management, clock generation,peripheral clocking and related issues this should probably take around 5 min...


Need some code samples for MAC7111 + IAR

Started by navin in comp.arch.embedded12 years ago

Hi all, I am working on 32 bit microcontroller i.e, MAC7111 and using IAR for debugging. I got some sample code from IAR for flashing but that...

Hi all, I am working on 32 bit microcontroller i.e, MAC7111 and using IAR for debugging. I got some sample code from IAR for flashing but that is using a system clock but I want to use PLL to increase the speed. So if any one has any code examples for MAC7100/7111 then please send it. Thanks and Regards Naveen


Real Time Clock Code (RTC) for PIC family

Started by tomcee in comp.arch.embedded9 years ago 51 replies

Hello: What is the latest RTC code anyone could recommend for the PIC (16f) family? My requirements are simplicity and low power, with LCD...

Hello: What is the latest RTC code anyone could recommend for the PIC (16f) family? My requirements are simplicity and low power, with LCD display and perhaps RS232 interface. Is the Microchip AN582 as good as it gets? Thanks, TomC


I2C Question

Started by Anonymous in comp.arch.embedded14 years ago 3 replies

If a I2C master is in the middle of communications transfer with a slave and the slave suddenly resets or hangs, how can the I2C master regain...

If a I2C master is in the middle of communications transfer with a slave and the slave suddenly resets or hangs, how can the I2C master regain control of the bus, and how can it prevent from 'hanging' when the slave keeps clock stretching? -=- This message was sent via two or more anonymous remailing services.