contiki/platform/msb430/dev/adc.c

95 lines
2.6 KiB
C

/*
* Copyright (c) 2007, Swedish Institute of Computer Science
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the Institute nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* This file is part of the Contiki operating system.
*
*/
/**
* \file
* ADC functions.
* \author
* Nicolas Tsiftes <nvt@sics.se>
*/
#include "contiki.h"
#include "contiki-msb430.h"
void
adc_init(void)
{
ADC12CTL0 = SHT0_15 | SHT1_15 | MSC;
/*
* SHP: sampling timer
* CONSEQ3: repeat sequence of channels
* CSTARTADD: conversion start address 0
*/
ADC12CTL1 = SHP | CONSEQ_3 | CSTARTADD_0;
/* P60: A0 */
ADC12MCTL0 = INCH_0 | SREF_0;
ADC12MCTL1 = INCH_1 | SREF_0;
ADC12MCTL2 = INCH_2 | SREF_0;
/* P61: A1 */
ADC12MCTL3 = ADC12MCTL4 = ADC12MCTL5 = INCH_1 | SREF_0;
/* P62: A2 */
ADC12MCTL6 = ADC12MCTL7 = ADC12MCTL8 = ADC12MCTL9 = INCH_2 | SREF_0;
/* P63: A3 */
ADC12MCTL10 = INCH_3 | SREF_0;
/* P64: A4 */
ADC12MCTL11 = INCH_4 | SREF_0;
/* P65: A5 */
ADC12MCTL12 = INCH_5 | SREF_0;
/* INCH10: Temperature sensor. */
ADC12MCTL13 = INCH_10 | SREF_0 | EOS;
}
void
adc_on(void)
{
ADC12CTL0 |= ADC12ON;
clock_delay(20000);
ADC12CTL0 |= ENC;
ADC12CTL0 |= ADC12SC;
}
void
adc_off(void)
{
ADC12CTL0 &= ~ENC;
clock_delay(20000);
ADC12CTL0 &= ~ADC12ON;
}