ChibiOS Free Embedded RTOS

Posted: **Thu May 19, 2016 10:41 am**

Hi,

I just got an STM32F746ZG Nucleo144 and I'm testing the ADC conversion demo from the same MCU but Discovery version, since I think there are no official demos for this board. The ADC callback is not executing, maybe there are some difference on the boards? I changed the input to use the AN3 and AN10, do I need to declare the inputs as analog?

Code: Select all

 palSetLineMode(LINE_ADC123_IN3, PAL_MODE_INPUT_ANALOG);
 palSetLineMode(LINE_ADC123_IN10, PAL_MODE_INPUT_ANALOG);

Also here's the configuration code for the ADC,

Code: Select all

static const ADCConversionGroup adcgrpcfg1 =
{
 true,
 ADC_GRP1_NUM_CHANNELS,
 adccallback,
 adcerrorcallback,
 0, /* CR1 */
 ADC_CR2_EXTEN_RISING | ADC_CR2_EXTSEL_SRC(12), /* CR2 */
 ADC_SMPR2_SMP_AN3(ADC_SAMPLE_144) | ADC_SMPR1_SMP_AN10(ADC_SAMPLE_144),
 0, /* SMPR2 */
 ADC_SQR1_NUM_CH(ADC_GRP1_NUM_CHANNELS), /* SQR1 */
 0, /* SQR1 */
 ADC_SQR3_SQ2_N(ADC_CHANNEL_IN10) | ADC_SQR3_SQ1_N(ADC_CHANNEL_IN3)
};

Maybe i'm doing something wrong.
Thanks in advance
LM

Posted: **Thu May 19, 2016 10:49 am**

Hi,
I think you have copied the configuration from the GPT-ADC demo. In this case there is a timer which triggers the ADC. Hence, you need to change the value of CR2 to trigger ADC by software. Something like this:

Code: Select all

static const ADCConversionGroup adcgrpcfg1 =
{
 true,
 ADC_GRP1_NUM_CHANNELS,
 adccallback,
 adcerrorcallback,
 0, /* CR1 */
 ADC_CR2_SWSTART, /* CR2 */
 ADC_SMPR2_SMP_AN3(ADC_SAMPLE_144) | ADC_SMPR1_SMP_AN10(ADC_SAMPLE_144),
 0, /* SMPR2 */
 ADC_SQR1_NUM_CH(ADC_GRP1_NUM_CHANNELS), /* SQR1 */
 0, /* SQR1 */
 ADC_SQR3_SQ2_N(ADC_CHANNEL_IN10) | ADC_SQR3_SQ1_N(ADC_CHANNEL_IN3)
};

Otherwise configure the proper timer also.
By the way this goes under STM32 Support. Moved to the proper section.
Ciao,
RM

Posted: **Thu May 19, 2016 1:00 pm**

Thanks RoccoMarco, everything works fine now.

Posted: **Tue May 24, 2016 1:34 pm**

Hi now I'm testing the DAC module, and I'm having the same problem I had with the ADC.

Code: Select all

#include "ch.h"
#include "hal.h"

#define DAC_BUFFER_SIZE 360

/*
 * DAC test buffer (sine wave).
 */
static const dacsample_t dac_buffer[DAC_BUFFER_SIZE] = {
  0, 2082, 2118, 2154, 2189, 2225, 2260, 2296, 2331, 2367, 2402, 2437,
  2472, 2507, 2542, 2576, 2611, 2645, 2679, 2713, 2747, 2780, 2813, 2846,
  2879, 2912, 2944, 2976, 3008, 3039, 3070, 3101, 3131, 3161, 3191, 3221,
  3250, 3278, 3307, 3335, 3362, 3389, 3416, 3443, 3468, 3494, 3519, 3544,
  3568, 3591, 3615, 3637, 3660, 3681, 3703, 3723, 3744, 3763, 3782, 3801,
  3819, 3837, 3854, 3870, 3886, 3902, 3917, 3931, 3944, 3958, 3970, 3982,
  3993, 4004, 4014, 4024, 4033, 4041, 4049, 4056, 4062, 4068, 4074, 4078,
  4082, 4086, 4089, 4091, 4092, 4093, 4094, 4093, 4092, 4091, 4089, 4086,
  4082, 4078, 4074, 4068, 4062, 4056, 4049, 4041, 4033, 4024, 4014, 4004,
  3993, 3982, 3970, 3958, 3944, 3931, 3917, 3902, 3886, 3870, 3854, 3837,
  3819, 3801, 3782, 3763, 3744, 3723, 3703, 3681, 3660, 3637, 3615, 3591,
  3568, 3544, 3519, 3494, 3468, 3443, 3416, 3389, 3362, 3335, 3307, 3278,
  3250, 3221, 3191, 3161, 3131, 3101, 3070, 3039, 3008, 2976, 2944, 2912,
  2879, 2846, 2813, 2780, 2747, 2713, 2679, 2645, 2611, 2576, 2542, 2507,
  2472, 2437, 2402, 2367, 2331, 2296, 2260, 2225, 2189, 2154, 2118, 2082,
  2047, 2012, 1976, 1940, 1905, 1869, 1834, 1798, 1763, 1727, 1692, 1657,
  1622, 1587, 1552, 1518, 1483, 1449, 1415, 1381, 1347, 1314, 1281, 1248,
  1215, 1182, 1150, 1118, 1086, 1055, 1024,  993,  963,  933,  903,  873,
   844,  816,  787,  759,  732,  705,  678,  651,  626,  600,  575,  550,
   526,  503,  479,  457,  434,  413,  391,  371,  350,  331,  312,  293,
   275,  257,  240,  224,  208,  192,  177,  163,  150,  136,  124,  112,
   101,   90,   80,   70,   61,   53,   45,   38,   32,   26,   20,   16,
    12,    8,    5,    3,    2,    1,    0,    1,    2,    3,    5,    8,
    12,   16,   20,   26,   32,   38,   45,   53,   61,   70,   80,   90,
   101,  112,  124,  136,  150,  163,  177,  192,  208,  224,  240,  257,
   275,  293,  312,  331,  350,  371,  391,  413,  434,  457,  479,  503,
   526,  550,  575,  600,  626,  651,  678,  705,  732,  759,  787,  816,
   844,  873,  903,  933,  963,  993, 1024, 1055, 1086, 1118, 1150, 1182,
  1215, 1248, 1281, 1314, 1347, 1381, 1415, 1449, 1483, 1518, 1552, 1587,
  1622, 1657, 1692, 1727, 1763, 1798, 1834, 1869, 1905, 1940, 1976, 2012
};

/*
 * DAC streaming callback.
 */
size_t nx = 0, ny = 0, nz = 0;
static void end_cb1(DACDriver *dacp, const dacsample_t *buffer, size_t n) {

  (void)dacp;

  nz++;
  if (dac_buffer == buffer) {
    nx += n;
  }
  else {
    ny += n;
  }

  palToggleLine(LINE_LED3);
}

/*
 * DAC error callback.
 */
static void error_cb1(DACDriver *dacp, dacerror_t err) {

  (void)dacp;
  (void)err;

  chSysHalt("DAC failure");
}

static const DACConfig dac1cfg1 = {
  .init         = 2047U,
  .datamode     = DAC_DHRM_12BIT_RIGHT
};

static const DACConversionGroup dacgrpcfg1 = {
  .num_channels = 1U,
  .end_cb       = end_cb1,
  .error_cb     = error_cb1,
  .trigger      = DAC_TRG_SW
};

/*
 * GPT6 configuration.
 */
static const GPTConfig gpt6cfg1 = {
  .frequency    = 1000000U,
  .callback     = NULL,
  .cr2          = TIM_CR2_MMS_1,    /* MMS = 010 = TRGO on Update Event.    */
  .dier         = 0U
};

/*
 * Application entry point.
 */
int main(void) {

  /*
   * System initializations.
   * - HAL initialization, this also initializes the configured device drivers
   *   and performs the board-specific initializations.
   * - Kernel initialization, the main() function becomes a thread and the
   *   RTOS is active.
   */
  halInit();
  chSysInit();

  /*
   * Starting DAC1 driver, setting up the output pin as analog as suggested
   * by the Reference Manual.
   */
  palSetPadMode(GPIOA, 4, PAL_MODE_INPUT_ANALOG);
  dacStart(&DACD1, &dac1cfg1);

  /*
   * Starting GPT6 driver, it is used for triggering the DAC.
   */
  gptStart(&GPTD6, &gpt6cfg1);

  /*
   * Starting a continuous conversion.
   */
  dacStartConversion(&DACD1, &dacgrpcfg1, dac_buffer, DAC_BUFFER_SIZE);
  gptStartContinuous(&GPTD6, 2U);

  /*
   * Normal main() thread activity
   */
  while (true) {
    chThdSleepMilliseconds(500);
  }
  return 0;
}

The DAC output has 1.64 V (more or less) fixed, and it should be a sinusoidal wave. I thought that maybe the DAC was only taking the first value of the array, so i changed it just to see the output and it remained fixed at 1.64.

Thanks
LM

ChibiOS Free Embedded RTOS

STM32F746ZG Nucleo144 ADC Problem

STM32F746ZG Nucleo144 ADC Problem

Re: STM32F746ZG Nucleo144 ADC Problem

Re: STM32F746ZG Nucleo144 ADC Problem

Re: STM32F746ZG Nucleo144 ADC Problem