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RIOT/tests/periph_dac/main.c 1.45 KB
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  /*
   * Copyright (C) 2014-2016 Freie Universitรคt Berlin
   *
   * This file is subject to the terms and conditions of the GNU Lesser General
   * Public License v2.1. See the file LICENSE in the top level directory for more
   * details.
   */
  
  /**
   * @ingroup     tests
   * @{
   *
   * @file
   * @brief       Test case for the low-level DAC driver
   *
   * @author      Peter Kietzmann <peter.kietzmann@haw-hamburg.de>
   * @author      Hauke Petersen <hauke.petersen@fu-berlin.de>
   *
   * @}
   */
  
  #include <stdio.h>
  
  #include "xtimer.h"
  #include "periph/dac.h"
  
  
  #define DELAY           (100U)
  #define STEPS           (1000U)
  
  int main(void)
  {
      xtimer_ticks32_t last = xtimer_now();
      uint16_t val = 0;
      uint16_t step = 0xffff / STEPS;
  
      puts("\nRIOT DAC peripheral driver test\n");
      puts("This test application produces a saw tooth signal on each available\n"
           "DAC line. The period of the signal should be around 100ms\n");
  
      /* initialize all DAC lines */
      for (int i = 0; i < DAC_NUMOF; i++) {
          if (dac_init(DAC_LINE(i)) < 0) {
              printf("Error initializing DAC_LINE(%i)\n", i);
              return 1;
          }
          else {
              printf("Successfully initialized DAC_LINE(%i)\n", i);
          }
      }
      puts("");
  
      /* create saw tooth signal */
      while (1) {
          for (int i = 0; i < DAC_NUMOF; i++) {
              dac_set(DAC_LINE(i), val);
          }
          val += step;
          xtimer_periodic_wakeup(&last, DELAY);
      }
  
      return 0;
  }