text: /*
   * Copyright (C) 2016-2017 Bas Stottelaar <basstottelaar@gmail.com>
   *
   * 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     cpu_efm32
   * @ingroup     drivers_periph_dac
   * @{
   *
   * @file
   * @brief       Low-level DAC driver implementation
   *
   * @author      Bas Stottelaar <basstottelaar@gmail.com>
   *
   * @}
   */
  
  #include "cpu.h"
  
  #include "periph_conf.h"
  #include "periph/dac.h"
  
  #include "em_cmu.h"
  #if defined(DAC_COUNT) && DAC_COUNT > 0
  #include "em_dac.h"
  #endif
  
  int8_t dac_init(dac_t line)
  {
      /* check if device is valid */
      if (line >= DAC_NUMOF) {
          return -1;
      }
  
      uint8_t dev = dac_channel_config[line].dev;
  
      /* enable clock */
      CMU_ClockEnable(cmuClock_HFPER, true);
      CMU_ClockEnable(dac_config[dev].cmu, true);
  
      /* reset and initialize peripheral */
      DAC_Init_TypeDef init = DAC_INIT_DEFAULT;
  
      DAC_Reset(dac_config[dev].dev);
      DAC_Init(dac_config[dev].dev, &init);
  
      /* initialize channel */
      DAC_InitChannel_TypeDef init_channel = DAC_INITCHANNEL_DEFAULT;
  
      init_channel.enable = true;
  
      DAC_InitChannel(dac_config[dev].dev,
                      &init_channel,
                      dac_channel_config[line].index);
  
      return 0;
  }
  
  void dac_set(dac_t line, uint16_t value)
  {
      uint8_t dev = dac_channel_config[line].dev;
  
      DAC_ChannelOutputSet(dac_config[dev].dev,
                           dac_channel_config[line].index,
                           value & 0xfff);
  }
  
  void dac_poweron(dac_t line)
  {
      uint8_t dev = dac_channel_config[line].dev;
  
      CMU_ClockEnable(dac_config[dev].cmu, true);
  }
  
  void dac_poweroff(dac_t line)
  {
      uint8_t dev = dac_channel_config[line].dev;
  
      CMU_ClockEnable(dac_config[dev].cmu, false);
  }
  