[ECOS] RE: stm3210e eval board adc question

["Christophe Coutand" <ccoutand@stmi.com>]

Hi Jayant,

From this documentation: http://www.st.com/stonline/books/pdf/docs/14220.pdf, the potentiometer is connected to PC4.

Looking at the IOs definition in: packages\hal\cortexm\stm32\var\current\include\var_io.h, you can sample PC4 using ADC1/14.

#define CYGHWR_HAL_STM32_ADC12_IN14             CYGHWR_HAL_STM32_GPIO( C, 4,  IN, ANALOG )
#define CYGHWR_HAL_STM32_ADC1_IN14              CYGHWR_HAL_STM32_ADC12_IN14

The adc2 test does not log any sampling results. It is used to check that the sampling rate is correct over a period of 10 seconds. The output of your test does not look good. The \0x09 is a tabulation that your terminal is not interpreting (which terminal do you use)? But the result is 0 for all channels, meaning that no samples are read. 

----------------------------------------
Samples expected after 10210 milliseconds: 10210
Samples read (per channel):
/dev/adc00          \0x09= 0

Do you have a way to step into the code? I don't clearly see how the test can complete without reading samples. Line 181 is a loop waiting for samples:

 // Read & count samples
 do {
    cyg_uint32 len = sizeof(sample);
    res = cyg_io_read(chan->handle, &sample, &len);
    if (res == ENOERR)
       chan->count++;
 } while (res == ENOERR);

You can also try the adc1 test which shall read and display the sampled data. I don't own a STM3210e boards therefore can't give it a try.

Regards,
Christophe

-----Original Message-----
From: jayant biswas [mailto:biswasj@gmail.com] 
Sent: 18. april 2011 16:49
To: Christophe Coutand
Cc: ecos-discuss@ecos.sourceware.org
Subject: Re: stm3210e eval board adc question

Dear Christophe!

Thanks for your support. I have a feeling I am getting closer, but not
quite there yet. So I appreciate your time in helping me out. Now I
have been able to add the adc io, as in the screenshot you sent using
only the cvs code. So I am not mixing anymore ecos-3.0 and the cvs.
But when I run the tests on my stm3210e eval board I do not get the
desired output. The output of adc2 test is shown below. It shows that
no samples have been read. I am also not sure what to make of the
\0x09 stuff before the '=' signs.

My goal is to be able to read the value from the potentiometer on the
board (http://www.st.com/internet/com/TECHNICAL_RESOURCES/TECHNICAL_LITERATURE/DATA_BRIEF/CD00278458.pdf
as shown on page 2/3) and eventually also from the 3 bnc connectors.
First of all, how can I know which input (BNC or Potentiometer) is
connected to which device on which channel? And secondly why when I
try to display values from all channels on both devices I receive
nothing. One of these channels must be connected to the potentiometer
no? The BNC connectors are currently left open.

Hope I can make this work.

Regards,
Jayant

\0x00INFO:<ADC performance test>
INFO:<Opening available ADC channel
s>
Opened 32 ADC channels
INFO:<Preparing ADC channels for test>
INFO:<Starting measurement>


/dev/adc00          \0x09= 0
/dev/adc01          \0x09= 0
/dev/adc02
          \0x09= 0
/dev/adc03          \0x09= 0
.
.
.
/dev/adc113         \0x09= 0
/dev/adc114         \0x09= 0
/dev/adc115         \0x09= 0
INFO:<Finished measurement>


----------------------------------------
Samples expected after 10210 milliseconds: 10210
Samples read (per channel):
/dev/adc00          \0x09= 0
.
.
.

On Mon, Apr 18, 2011 at 11:47, Christophe Coutand <ccoutand@stmi.com> wrote:
> Hi Jayant,
>
> You are using ecos-3.0 with the additional STM32 ADC package from CVS? It is usually not recommended to mix source code as it make it more difficult to get support from the mailing list.
>
> It is not enough to copy the directory packages\devs\adc\cortexm\stm32 in your repository, you must also include the package entry in the database (i.e. ecos.db):
>
> package CYGPKG_DEVS_ADC_CORTEXM_STM32 {
>    alias         { "STM32 ADC driver" adc_stm32 }
>    hardware
>    directory     devs/adc/cortexm/stm32
>    script        adc_stm32.cdl
>    description "
>    This package provides a driver for the ADC interfaces found on the
>    ST STM32 microcontroller family."
> }
>
> To build the STM32 HAL with ADC support from CVS repository, I do:
> $ ecosconfig.exe new stm3210e default
> $ ecosconfig.exe add io_adc
>
> You can configure the ADC from the GUI:
> $ configtool.exe ecos.ecc
>
> Example:
>
> http://dl.dropbox.com/u/21589565/misc/stm32_adc.JPG
>
> Regards,
> Christophe
>
> -----Original Message-----
> From: jayant biswas [mailto:biswasj@gmail.com]
> Sent: 18. april 2011 10:47
> To: John Dallaway; Christophe Coutand
> Cc: ecos-discuss@ecos.sourceware.org
> Subject: Re: stm3210e eval board adc question
>
> Thank you Christophe and John for your replies.
>
> I did checkout the cvs repository and was able to get the right folder
> i.e. packages\devs\adc\cortexm\stm32
>
> However, this hasn't solved my problem. I am still getting the same
> output as before when calling cyg_io_lookup and cyg_io_read.
>
> To integrate the new packages from the cvs. I copied  the entire
> repository over my ecos-3.0 folder. Then I regenerated the ecos.ecc
> file for stm3210e. I noticed here that the
> CYGPKG_DEVS_ADC_CORTEXM_STM32 checkboxes were grayed out. I then
> recompiled my application with the newly generated libraries.
>
> Please let me know if I am missing some steps. I am sure I am. Is
> there a guide that I can follow that shows how to integrate the ecos
> cvs packages?
>
> Best regards,
> Jayant
>
> On Wed, Apr 13, 2011 at 20:11, John Dallaway <john@dallaway.org.uk> wrote:
>> Hi Jayant
>>
>> jayant biswas wrote:
>>
>>> I installed ecos as indicated here
>>> http://ecos.sourceware.org/getstart.html .
>>
>> ... so you have the eCos 3.0 release repository.
>>
>> The STM32 ADC driver is not present in eCos 3.0. You will have to
>> checkout the eCos CVS repository in order to gain access to
>> CYGPKG_DEVS_ADC_CORTEXM_STM32. Ref:
>>
>>  http://ecos.sourceware.org/anoncvs.html
>>
>> I hope this helps...
>>
>> John Dallaway
>> eCos maintainer
>> http://www.dallaway.org.uk/john
>>
>

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