--- In piclist@picl..., "rtstofer" <rstofer@...> wrote:
>
> --- In piclist@picl..., Fiona Soon <fionasoon2001@> wrote:
> > Now the question is, if i want to write
codes for 2 ADC module,
> (yes, i know PIC16F877 has multiple AN0-6 input), but there is only
> one TXREG register and TX pin. How can i acquire 2 analog signal at
> the same time and send them out to two serial port?
I'm afraid you'll probably have a problem. There is one ADC module,
having a multiplexing input scheme. So you can't measure two analog
signals "in the same time" as you requested, only if you're
sampling
and hold - exactly in the same time- those two analogic signals
outside the pic and then read succesively the voltage from the each
sampling capacitor with two different analogic inputs. Using two
serials does not solve your problem as long as the time required for
one AD measurement is about 20uS.
So anyway using one PIC, you'll have at least (20uS + memory storing
time) between two succesive (and not simultaneous) AD readings.
greetings,
Vasile
Reply by Fiona Soon●March 6, 20062006-03-06
Thanks guys!
I think i will opt to choose a
PIC with 2 UART which is a more trivial solution.
Thank you.
Chris <f...@aol.com>
wrote:
--- In p...@yahoogroups.com, Fiona Soon <fionasoon2001@...>
wrote: > > Hello Chris, Chart and Cullins, > > Of course, Fiona is a girl! > > I have written codes for one
channel 10bit ADC by setting all the relavent register (SPBRG, ADCON0,
RCSTA and etc.) and move two packets of data out (8 bit and 2 bit
respectively) to the TXREG through the TX pin. >
> Now the question is, if i want to write codes for 2 ADC
module, (yes, i know PIC16F877 has multiple AN0-6 input), but
there is only one TXREG register and TX pin. How can i acquire 2 analog
signal at the same time and send them out to two serial port? Don't i
need two TX pin?i think that i understand your concept. So okay it's a
case of using a pic with 2 Uarts and nearly all of them have multichannel
A/D's
If you can attach your serial data receivers to the same
output though you can get a lot of mileage out of what you have.....
Loop back to the top after a pause...don't want to swamp the serial
bus
If your serial receivers are something of your own design they
can all share the same serial line, either by looping through the TX-RX
UART on each device or by buffering the output from the sender and
connecting all receivers to the single
buffer. The chained devices being the preffered way because if each device
knows it's own position in the chain it knows which byte in the
stream is relevant to itself.
Chris, (Currently chaining upto
255 16F690's)
Yahoo! Mail
Bring photos to life! New PhotoMail makes sharing a breeze.
Reply by Chris●March 6, 20062006-03-06
--- In piclist@picl..., Fiona Soon <fionasoon2001@...> wrote:
>
> Hello Chris, Chart and Cullins,
>
> Of course, Fiona is a girl!
>
> I have written codes for one channel 10bit ADC by setting all the
relavent register (SPBRG, ADCON0, RCSTA and etc.) and move two packets
of data out (8 bit and 2 bit respectively) to the TXREG through the TX
pin.
>
> Now the question is, if i want to write codes for 2 ADC module,
(yes, i know PIC16F877 has multiple AN0-6 input), but there is only one
TXREG register and TX pin. How can i acquire 2 analog signal at the
same time and send them out to two serial port? Don't i need two TX pin?
>
i think that i understand your concept.
So okay it's a case of using a pic with 2 Uarts and nearly all of them
have multichannel A/D's
If you can attach your serial data receivers to the same output though
you can get a lot of mileage out of what you have.....
Read A2D input 0 > Saved_A2D_0
Read A2D input 1 > Saved_A2D_1
Read
.
.
.
.
Movf Saved_A2D_0 > txreg
Movf Saved_A2D_0 > txreg
Movf
.
.
Loop back to the top after a pause...don't want to swamp the serial bus
If your serial receivers are something of your own design they can all
share the same serial line, either by looping through the TX-RX UART on
each device or by buffering the output from the sender and connecting
all receivers to the single buffer. The chained devices being the
preffered way because if each device knows it's own position in the
chain it knows which byte in the stream is relevant to itself.
Chris,
(Currently chaining upto 255 16F690's)
Reply by rtstofer●March 6, 20062006-03-06
--- In piclist@picl..., Fiona Soon <fionasoon2001@...> wrote:
>
> Hello Chris, Chart and Cullins,
>
> Of course, Fiona is a girl!
>
> I have written codes for one channel 10bit ADC by setting all the
relavent register (SPBRG, ADCON0, RCSTA and etc.) and move two packets
of data out (8 bit and 2 bit respectively) to the TXREG through the TX
pin.
>
> Now the question is, if i want to write codes for 2 ADC module,
(yes, i know PIC16F877 has multiple AN0-6 input), but there is only
one TXREG register and TX pin. How can i acquire 2 analog signal at
the same time and send them out to two serial port? Don't i need two
TX pin?
>
> My example code to share is in the attachment if anyone interested.
>
> Thank you.
>
> Fiona
>
Doing a parametric search of 8 bit PICs at www.microchip.com yields 20
devices in the 18f series with dual AUSARTs or dual EUSARTs. All have
MANY A/D channels between 11 and 16.
I suppose there is a reason you can just send the data out 1 USART by
just reading a channel, sending the data, reading another channel,
sending that data, etc.
Richard
Reply by rtstofer●March 6, 20062006-03-06
--- In piclist@picl..., Fiona Soon <fionasoon2001@...> wrote:
>
> Hello Chris, Chart and Cullins,
>
> Of course, Fiona is a girl!
>
> I have written codes for one channel 10bit ADC by setting all the
relavent register (SPBRG, ADCON0, RCSTA and etc.) and move two packets
of data out (8 bit and 2 bit respectively) to the TXREG through the TX
pin.
>
> Now the question is, if i want to write codes for 2 ADC module,
(yes, i know PIC16F877 has multiple AN0-6 input), but there is only
one TXREG register and TX pin. How can i acquire 2 analog signal at
the same time and send them out to two serial port? Don't i need two
TX pin?
>
> My example code to share is in the attachment if anyone interested.
>
> Thank you.
>
> Fiona
Frankly, I would find a processor with the proper hardware. Many
devices have 2 UARTS including the Atmel ATmega128 and related
devices. I am certain that there are PICs that have 2 UARTS, as well.
However, you could always bit-bank a serial stream to any pin. Code
for doing this is all over the Internet. You might look over at
www.piclist.com.
Richard
Reply by Fiona Soon●March 6, 20062006-03-06
Hello Chris, Chart and Cullins,
Of course,
Fiona is a girl!
I have written codes for one channel 10bit ADC by setting
all the relavent register (SPBRG, ADCON0, RCSTA and etc.) and move two packets
of data out (8 bit and 2 bit respectively) to the TXREG through the TX
pin.
Now the question is, if i want to write codes
for 2 ADC module, (yes, i know PIC16F877 has multiple AN0-6 input), but there is
only one TXREG register and TX pin. How can i acquire 2 analog signal at the
same time and send them out to two serial port? Don't i need two TX
pin?
My example code to share is in the attachment
if anyone interested.
Thank you.
Fiona
Yahoo! Mail
Bring photos to life! New PhotoMail makes sharing a breeze.
Reply by Chris●March 3, 20062006-03-03
--- In piclist@picl..., "Leon Heller" <leon.heller@...>
wrote:
>
> ----- Original Message -----
> From: JCullins
> To: piclist@picl...
> Sent: Friday, March 03, 2006 1:18 PM
> Subject: Re: [piclist] PIC with 2 ADC module
>
>
> Most pic chips that have analog will have 5 to 8 analog inputs.
> Pic16f818, 819, 872 873, 877. There are are many more
> than listed here.
> Mosf PIC16F series as listed here will be be 10 analog as well.
> and yes you can read any one are all one after the other. takes
approx 10us
> for each read.
> Jim
>
> I think he wanted two separate ADC modules, not inputs.
>
> Leon
I thought Fiona was a girl's name up until now ;-)
She stated a couple of mS delay between channel reads was acceptable,
so unless the aim is to read two voltages simultaneously most pics
with A/D will be able to handle the task.
Chris B
(Without a failing 's' key !)
GM4UCD
Reply by Chad Russel●March 3, 20062006-03-03
Try the selector guide at Microchip.com:
http://www.microchip.com/stellent/idcplg?IdcService=SS_GET_PAGE&nodeIdt
--- Fiona Soon <fionasoon2001@fion...> wrote:
> Hello All,
> Can someone tell me which PIC has 2 ADC module? Can they run
> simultaneously although with a few ms of delay due to program
> sequencing?
>
> Thank you.
>
>
>
> ---------------------------------
> Relax. Yahoo! Mail virus scanning helps detect nasty viruses!
My software has no bugs, only undocumented features.
Reply by JCullins●March 3, 20062006-03-03
Most pic chips that have analog will have 5 to 8 analog
inputs.
Pic16f818, 819, 872 873, 877. There are are many
more
than listed here.
Mosf PIC16F series as listed here will be be
10 analog as well.
and yes you can read any one are all one after the
other. takes approx 10us
for each read.
Jim
On 3/3/2006 12:06:09 AM, Fiona Soon
(f...@yahoo.com) wrote: > Hello All, > Can someone tell me which
PIC has 2 ADC module? Can they run > simultaneously although with a few
ms of delay due to program sequencing? > > Thank you.> > - > Relax. and follow the > instructions> >
SPONSORED LINKS > Microcontroller [link: groups.yahoo. >
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Reply by Leon Heller●March 3, 20062006-03-03
----- Original Message -----
From: JCullins
To: p...@yahoogroups.com
Sent: Friday, March 03, 2006 1:18 PM
Subject: Re: [piclist] PIC with 2 ADC
module
Most pic chips that have analog will have 5 to 8 analog
inputs.
Pic16f818, 819, 872 873, 877. There are are many
more
than listed here.
Mosf PIC16F series as listed here will be be
10 analog as well.
and yes you can read any one are all one after the
other. takes approx 10us
for each read.
Jim
I think he wanted two separate ADC modules, not
inputs.
Leon
--
Leon Heller, G1HSM l...@bulldoghome.com http://webspace.webring.com/people/jl/leon_heller/