adc.c

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00001 /*
00002  * Copyright (c) 2007, Swedish Institute of Computer Science
00003  * All rights reserved.
00004  *
00005  * Redistribution and use in source and binary forms, with or without
00006  * modification, are permitted provided that the following conditions
00007  * are met:
00008  * 1. Redistributions of source code must retain the above copyright
00009  *    notice, this list of conditions and the following disclaimer.
00010  * 2. Redistributions in binary form must reproduce the above copyright
00011  *    notice, this list of conditions and the following disclaimer in the
00012  *    documentation and/or other materials provided with the distribution.
00013  * 3. Neither the name of the Institute nor the names of its contributors
00014  *    may be used to endorse or promote products derived from this software
00015  *    without specific prior written permission.
00016  *
00017  * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
00018  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
00019  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
00020  * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
00021  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
00022  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
00023  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
00024  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
00025  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
00026  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
00027  * SUCH DAMAGE.
00028  *
00029  * This file is part of the Contiki operating system.
00030  *
00031  */
00032 
00033 /**
00034  * \file
00035  *      ADC functions.
00036  * \author
00037  *      Nicolas Tsiftes <nvt@sics.se>
00038  */
00039 
00040 #include <io.h>
00041 #include <signal.h>
00042 #include <msp430/adc12.h>
00043 
00044 #include "contiki-msb430.h"
00045 
00046 void
00047 adc_init(void)
00048 {
00049   ADC12CTL0 = SHT0_15 | SHT1_15 | MSC;
00050 
00051   /*
00052    * SHP: sampling timer
00053    * CONSEQ3: repeat sequence of channels
00054    * CSTARTADD: conversion start address 0
00055    */
00056   ADC12CTL1 = SHP | CONSEQ_3 | CSTARTADD_0;
00057 
00058   /* P60: A0 */
00059   ADC12MCTL0 = INCH_0 | SREF_0;
00060   ADC12MCTL1 = INCH_1 | SREF_0;
00061   ADC12MCTL2 = INCH_2 | SREF_0;
00062 
00063   /* P61: A1 */
00064   ADC12MCTL3 = ADC12MCTL4 = ADC12MCTL5 = INCH_1 | SREF_0;
00065 
00066   /* P62: A2 */
00067   ADC12MCTL6 = ADC12MCTL7 = ADC12MCTL8 = ADC12MCTL9 = INCH_2 | SREF_0;
00068 
00069   /* P63: A3 */
00070   ADC12MCTL10 = INCH_3 | SREF_0;
00071 
00072   /* P64: A4 */
00073   ADC12MCTL11 = INCH_4 | SREF_0;
00074 
00075   /* P65: A5 */
00076   ADC12MCTL12 = INCH_5 | SREF_0;
00077 
00078   /* INCH10: Temperature sensor. */
00079   ADC12MCTL13 = INCH_10 | SREF_0 | EOS;
00080 }
00081 
00082 void
00083 adc_on(void)
00084 {
00085   ADC12CTL0 |= ADC12ON;
00086   clock_delay(20000);
00087   ADC12CTL0 |= ENC;
00088   ADC12CTL0 |= ADC12SC;
00089 }
00090 
00091 void
00092 adc_off(void)
00093 {
00094   ADC12CTL0 &= ~ENC;
00095   clock_delay(20000);
00096   ADC12CTL0 &= ~ADC12ON;
00097 }