153 lines
4.5 KiB
C
153 lines
4.5 KiB
C
/*
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* Copyright (c) 2010, Swedish Institute of Computer Science.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the Institute nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* This file is part of the Contiki operating system.
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*
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*
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* -----------------------------------------------------------------
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*
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* Author : Joakim Eriksson
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* Created : 2010-02-02
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* Updated : $Date: 2010/08/25 19:30:53 $
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* $Revision: 1.3 $
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*/
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#include "contiki.h"
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#include "lib/sensors.h"
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#define ADC12MCTL_NO(adcno) ((unsigned char *) ADC12MCTL0_)[adcno]
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static uint16_t adc_on;
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static uint16_t ready;
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/*---------------------------------------------------------------------------*/
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static CC_INLINE void
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start(void)
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{
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uint16_t c, last;
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/* Set up the ADC. */
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P6DIR = 0xff;
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P6OUT = 0x00;
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/* Setup ADC12, ref., sampling time */
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/* XXX Note according to the specification a minimum of 17 ms should
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be allowed after turn on of the internal reference generator. */
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ADC12CTL0 = REF2_5V + SHT0_6 + SHT1_6 + MSC + REFON;
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/* Use sampling timer, repeat-sequence-of-channels */
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ADC12CTL1 = SHP + CONSEQ_3;
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last = 15;
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for(c = 0; c < 16; c++) {
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/* Clear all end-of-sequences */
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ADC12MCTL_NO(c) &= ~EOS;
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if(adc_on & (1 << c)) {
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if(last == 15) {
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/* Set new start of sequence to lowest active memory holder */
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ADC12CTL1 |= (c * CSTARTADD_1);
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}
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last = c;
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}
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}
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/* Set highest end-of-sequence. */
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ADC12MCTL_NO(last) |= EOS;
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ADC12CTL0 |= ADC12ON;
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ADC12CTL0 |= ENC; /* enable conversion */
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ADC12CTL0 |= ADC12SC; /* sample & convert */
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}
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/*---------------------------------------------------------------------------*/
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static CC_INLINE void
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stop(void)
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{
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/* stop converting immediately, turn off reference voltage, etc. */
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ADC12CTL0 &= ~ENC;
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/* need to remove CONSEQ_3 if not EOS is configured */
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ADC12CTL1 &= ~CONSEQ_3;
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/* wait for conversion to stop */
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while(ADC12CTL1 & ADC12BUSY);
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/* clear any pending interrupts */
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ADC12IFG = 0;
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}
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/*---------------------------------------------------------------------------*/
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int
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sky_sensors_status(uint16_t input, int type)
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{
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if(type == SENSORS_ACTIVE) {
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return (adc_on & input) == input;
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}
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if(type == SENSORS_READY) {
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ready |= ADC12IFG & adc_on & input;
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return (ready & adc_on & input) == input;
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}
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return 0;
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}
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/*---------------------------------------------------------------------------*/
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int
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sky_sensors_configure(uint16_t input, uint8_t ref, int type, int value)
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{
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uint16_t c;
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if(type == SENSORS_ACTIVE) {
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stop();
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if(value) {
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adc_on |= input;
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P6SEL |= input & 0xff;
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/* Set ADC config */
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for(c = 0; c < 16; c++) {
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if(input & (1 << c)) {
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ADC12MCTL_NO(c) = (c * INCH_1) | ref;
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}
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}
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} else {
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adc_on &= ~input;
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ready &= ~input;
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P6SEL &= ~(input & 0xff);
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}
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if(adc_on == 0) {
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P6DIR = 0x00;
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P6SEL = 0x00;
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/* Turn off ADC and internal reference generator */
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ADC12CTL0 = 0;
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ADC12CTL1 = 0;
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} else {
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start();
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}
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return 1;
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}
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return 0;
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}
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/*---------------------------------------------------------------------------*/
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