text: /***************************************************************************
   *             __________               __   ___.
   *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
   *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
   *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
   *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
   *                     \/            \/     \/    \/            \/
   * $Id$
   *
   * Copyright (C) 2006 by Barry Wardell
   *
   * This program is free software; you can redistribute it and/or
   * modify it under the terms of the GNU General Public License
   * as published by the Free Software Foundation; either version 2
   * of the License, or (at your option) any later version.
   *
   * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
   * KIND, either express or implied.
   *
   ****************************************************************************/
  #include "config.h"
  #include "cpu.h"
  #include "system.h"
  #include "kernel.h"
  #include "thread.h"
  #include "adc.h"
  
  static unsigned short adcdata[NUM_ADC_CHANNELS];
  
  unsigned short adc_read(int channel)
  {
      return adcdata[channel];
  }
  
  static void adc_tick(void)
  {
      if (ADCST & 0x10) {
          adcdata[0] = ADCCH0 & 0x3ff;
          adcdata[1] = ADCCH1 & 0x3ff;
          adcdata[2] = ADCCH2 & 0x3ff;
          adcdata[3] = ADCCH3 & 0x3ff;
          adcdata[4] = ADCCH4 & 0x3ff;
          ADCST = 0xa;
      }
  }
  
  void adc_init(void)
  {
      ADCR24 = 0xaaaaa;
      ADCR28 = 0;
      ADCST = 2;
      ADCST = 0xa;
  
      while (!(ADCST & 0x10));
      adc_tick();
    
      tick_add_task(adc_tick);
  }
  
  