RE: stm3210e eval board adc question

["Christophe Coutand" <ccoutand@xxxxxxxx>]

Hi Jayant,

Have you added the ADC IO package (CYGPKG_IO_ADC) ? 

CYGHWR_HAL_STM32_GPIO_IN is only relevant for digital IOs. To read ADC
channels, you must use cyg_io_lookup / cyg_io_read. Have a look at some
of the ADC test applications for AT91 or LPC24xx.

Hope this helps.

Christophe


-----Original Message-----
From: ecos-discuss-owner@xxxxxxxxxxxxxxxxxxx
[mailto:ecos-discuss-owner@xxxxxxxxxxxxxxxxxxx] On Behalf Of jayant
biswas
Sent: 12. april 2011 17:27
To: ecos-discuss@xxxxxxxxxxxxxxxxxxx
Subject:  stm3210e eval board adc question

Hello everyone!

I am new to this list and to ecos and the stm32 and am looking for
some help in reading from ADC inputs.

Here is the test program I have used to see if I can read the inputs.
I am able to read the normal input from the user key on the board, but
I am not able to read the analog input. pot_val is always 0. I test my
program by holding on to the user key and changing the potentiometer
position and then hitting reset. Do you have any ideas?

/* this is a simple hello world program */
#include <stdio.h>
#include <cyg/hal/hal_io.h>

#define CYGHWR_POT 	CYGHWR_HAL_STM32_GPIO(C, 4, IN, ANALOG)
#define CYGHWR_BUT 	CYGHWR_HAL_STM32_GPIO(G, 8, IN, FLOATING)

int cyg_user_start(void)
{
  cyg_int32 pot_val = 10;
  cyg_int32 but_val = 10;

  printf("Hello, eCos world!\n");
  CYGHWR_HAL_STM32_GPIO_SET(CYGHWR_POT);
  CYGHWR_HAL_STM32_GPIO_SET(CYGHWR_BUT);

  CYGHWR_HAL_STM32_GPIO_IN(CYGHWR_POT, &pot_val);
  CYGHWR_HAL_STM32_GPIO_IN(CYGHWR_BUT, &but_val);

  printf("Potentiometer value is %d, button value is %d\n", pot_val,
but_val);
  while(1);
  return 0;
}

I wasn't able to enable the cdl component CYGPKG_IO_ADC_DEVICES in my
ecos config as it wasn't available.

I have an STM3210E Eval board and am using it with an Amontec JTAG
key. I used the default stm3210e template and changed the target to
ROM. I load the program directly to the ROM so I am not using anything
like Redboot.

Thank you in advance for your help!

Jayant

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