188 lines
6.1 KiB
C
188 lines
6.1 KiB
C
/*
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* Copyright (c) 2015, Zolertia - http://www.zolertia.com
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* Copyright (c) 2015, University of Bristol - http://www.bristol.ac.uk
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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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*
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* 3. Neither the name of the copyright holder nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* 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,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
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* OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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/*---------------------------------------------------------------------------*/
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/**
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* \addtogroup zoul-adc-interface
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* @{
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*
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* \file
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* Generic driver for the Zoul ADC interface
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*/
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/*---------------------------------------------------------------------------*/
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#include "contiki.h"
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#include "sys/clock.h"
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#include "dev/ioc.h"
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#include "dev/gpio.h"
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#include "dev/adc.h"
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#include "adc-zoul.h"
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#include "zoul-sensors.h"
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#include <stdio.h>
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#include <stdint.h>
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/*---------------------------------------------------------------------------*/
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#define DEBUG 0
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#if DEBUG
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#define PRINTF(...) printf(__VA_ARGS__)
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#else
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#define PRINTF(...)
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#endif
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/*---------------------------------------------------------------------------*/
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static uint8_t decimation_rate;
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static uint8_t enabled_channels;
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/*---------------------------------------------------------------------------*/
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static int
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set_decimation_rate(uint8_t rate)
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{
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switch(rate) {
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case SOC_ADC_ADCCON_DIV_64:
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case SOC_ADC_ADCCON_DIV_128:
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case SOC_ADC_ADCCON_DIV_256:
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case SOC_ADC_ADCCON_DIV_512:
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decimation_rate = rate;
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break;
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default:
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return ZOUL_SENSORS_ERROR;
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}
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return decimation_rate;
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}
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/*---------------------------------------------------------------------------*/
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static int
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get_channel_pin(int type)
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{
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if((ZOUL_SENSORS_ADC1) && (type == ZOUL_SENSORS_ADC1)) {
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return SOC_ADC_ADCCON_CH_AIN0 + ADC_SENSORS_ADC1_PIN;
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}
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if((ZOUL_SENSORS_ADC2) && (type == ZOUL_SENSORS_ADC2)) {
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return SOC_ADC_ADCCON_CH_AIN0 + ADC_SENSORS_ADC2_PIN;
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}
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if((ZOUL_SENSORS_ADC3) && (type == ZOUL_SENSORS_ADC3)) {
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return SOC_ADC_ADCCON_CH_AIN0 + ADC_SENSORS_ADC3_PIN;
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}
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if((ZOUL_SENSORS_ADC4) && (type == ZOUL_SENSORS_ADC4)) {
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return SOC_ADC_ADCCON_CH_AIN0 + ADC_SENSORS_ADC4_PIN;
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}
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if((ZOUL_SENSORS_ADC5) && (type == ZOUL_SENSORS_ADC5)) {
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return SOC_ADC_ADCCON_CH_AIN0 + ADC_SENSORS_ADC5_PIN;
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}
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if((ZOUL_SENSORS_ADC6) && (type == ZOUL_SENSORS_ADC6)) {
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return SOC_ADC_ADCCON_CH_AIN0 + ADC_SENSORS_ADC6_PIN;
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}
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return ZOUL_SENSORS_ERROR;
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}
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/*---------------------------------------------------------------------------*/
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static int
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value(int type)
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{
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int channel;
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int16_t res;
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if(!(type & enabled_channels)) {
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PRINTF("ADC: channel not enabled\n");
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return ZOUL_SENSORS_ERROR;
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}
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channel = get_channel_pin(type);
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if(channel == ZOUL_SENSORS_ERROR) {
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PRINTF("ADC: pin not active\n");
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return ZOUL_SENSORS_ERROR;
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}
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res = adc_get(channel, ADC_SENSORS_REFERENCE, decimation_rate);
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/* Only allow negative values if using differential input */
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if((ADC_SENSORS_REFERENCE != SOC_ADC_ADCCON_REF_EXT_DIFF) && (res < 0)) {
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res = 0;
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}
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return res;
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}
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/*---------------------------------------------------------------------------*/
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static int
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configure(int type, int value)
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{
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switch(type) {
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case SENSORS_HW_INIT:
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/* This should filter out disabled sensors as its value should be zero */
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if((value < ZOUL_SENSORS_ADC_MIN) || (value > ZOUL_SENSORS_ADC_ALL)) {
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PRINTF("ADC: invalid adc pin mask (0x%02X)\n", value);
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return ZOUL_SENSORS_ERROR;
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}
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GPIO_SOFTWARE_CONTROL(GPIO_A_BASE, value);
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GPIO_SET_INPUT(GPIO_A_BASE, value);
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if(value & ZOUL_SENSORS_ADC1) {
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ioc_set_over(GPIO_A_NUM, ADC_SENSORS_ADC1_PIN, IOC_OVERRIDE_ANA);
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}
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if(value & ZOUL_SENSORS_ADC2) {
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ioc_set_over(GPIO_A_NUM, ADC_SENSORS_ADC2_PIN, IOC_OVERRIDE_ANA);
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}
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if(value & ZOUL_SENSORS_ADC3) {
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ioc_set_over(GPIO_A_NUM, ADC_SENSORS_ADC3_PIN, IOC_OVERRIDE_ANA);
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}
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if(value & ZOUL_SENSORS_ADC4) {
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ioc_set_over(GPIO_A_NUM, ADC_SENSORS_ADC4_PIN, IOC_OVERRIDE_ANA);
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}
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if(value & ZOUL_SENSORS_ADC5) {
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ioc_set_over(GPIO_A_NUM, ADC_SENSORS_ADC5_PIN, IOC_OVERRIDE_ANA);
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}
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if(value & ZOUL_SENSORS_ADC6) {
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ioc_set_over(GPIO_A_NUM, ADC_SENSORS_ADC6_PIN, IOC_OVERRIDE_ANA);
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}
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adc_init();
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set_decimation_rate(SOC_ADC_ADCCON_DIV_512);
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enabled_channels |= value;
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PRINTF("ADC: enabled channels 0x%02X\n", enabled_channels);
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break;
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case ZOUL_SENSORS_CONFIGURE_TYPE_DECIMATION_RATE:
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return set_decimation_rate((uint8_t)value);
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default:
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return ZOUL_SENSORS_ERROR;
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}
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return 0;
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}
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/*---------------------------------------------------------------------------*/
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static int
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status(int type)
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{
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return 1;
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}
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/*---------------------------------------------------------------------------*/
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SENSORS_SENSOR(adc_zoul, ADC_ZOUL, value, configure, status);
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/*---------------------------------------------------------------------------*/
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/** @} */
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