tinySA/testhal/STM32/STM32F4xx/DAC/main.c

/*
    ChibiOS - Copyright (C) 2006..2015 Giovanni Di Sirio

    Licensed under the Apache License, Version 2.0 (the "License");
    you may not use this file except in compliance with the License.
    You may obtain a copy of the License at

        http://www.apache.org/licenses/LICENSE-2.0

    Unless required by applicable law or agreed to in writing, software
    distributed under the License is distributed on an "AS IS" BASIS,
    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    See the License for the specific language governing permissions and
    limitations under the License.
*/

#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] = {
  2047, 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;
static void end_cb1(DACDriver *dacp, const dacsample_t *buffer, size_t n) {

  (void)dacp;

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

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

  (void)dacp;
  (void)err;

  chSysHalt("DAC failure");
}

static const DACConversionGroup daccfg1 = {
  num_channels: 1,
  end_cb:       end_cb1,
  error_cb:     error_cb1,
  datamode:     DAC_DHRM_12BIT_RIGHT,
  trigger:      DAC_TRG(0)
};

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

  /*
   * Starting a continous conversion.
   */
  dacStartConversion(&DACD1, &daccfg1, dac_buffer, DAC_BUFFER_SIZE);

  /*
   * Normal main() thread activity, if the button is pressed then the I2s
   * transfer is stopped.
   */
  while (true) {
    if (palReadPad(GPIOA, GPIOA_BUTTON)) {
      dacStopConversion(&DACD1);
    }
    chThdSleepMilliseconds(500);
  }
  return 0;
}