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RIOT/boards/chronos/drivers/battery.c 858 Bytes
fb11e647   vrobic   reseau statique a...
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  /*
   * Copyright (C) 2014 INRIA
   *
   * 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 chronos
   * @{
   */
  
  /**
   * @file
   * @brief       eZ430-chronos battery readout (via ADC)
   *
   * @author      Oliver Hahm <oliver.hahm@inria.fr>
   * @author      Ludwig KnΓΌpfer <ludwig.knuepfer@fu-berlin.de>
   *
   */
  
  #include <stdint.h>
  #include <stdint.h>
  #include <cc430f6137.h>
  
  #include "cc430-adc.h"
  
  uint32_t battery_get_voltage(void)
  {
      uint32_t voltage;
      voltage = adc12_single_conversion(REFVSEL_1, ADC12SHT0_10, ADC12INCH_11);
  
      /* Ideally we have A11=0->AVCC=0V ... A11=4095(2^12-1)->AVCC=4V
       * --> (A11/4095)*4V=AVCC --> AVCC=(A11*4)/4095 */
      voltage = (voltage * 2 * 2 * 1000) / 4095;
      return voltage;
  }