contiki/platform/zoul/dev/adc-zoul.c
2016-12-29 14:19:32 +01:00

188 lines
6.1 KiB
C

/*
* Copyright (c) 2015, Zolertia - http://www.zolertia.com
* Copyright (c) 2015, University of Bristol - http://www.bristol.ac.uk
* 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 copyright holder 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 COPYRIGHT HOLDERS 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
* COPYRIGHT HOLDER 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.
*/
/*---------------------------------------------------------------------------*/
/**
* \addtogroup zoul-adc-interface
* @{
*
* \file
* Generic driver for the Zoul ADC interface
*/
/*---------------------------------------------------------------------------*/
#include "contiki.h"
#include "sys/clock.h"
#include "dev/ioc.h"
#include "dev/gpio.h"
#include "dev/adc.h"
#include "adc-zoul.h"
#include "zoul-sensors.h"
#include <stdio.h>
#include <stdint.h>
/*---------------------------------------------------------------------------*/
#define DEBUG 0
#if DEBUG
#define PRINTF(...) printf(__VA_ARGS__)
#else
#define PRINTF(...)
#endif
/*---------------------------------------------------------------------------*/
static uint8_t decimation_rate;
static uint8_t enabled_channels;
/*---------------------------------------------------------------------------*/
static int
set_decimation_rate(uint8_t rate)
{
switch(rate) {
case SOC_ADC_ADCCON_DIV_64:
case SOC_ADC_ADCCON_DIV_128:
case SOC_ADC_ADCCON_DIV_256:
case SOC_ADC_ADCCON_DIV_512:
decimation_rate = rate;
break;
default:
return ZOUL_SENSORS_ERROR;
}
return decimation_rate;
}
/*---------------------------------------------------------------------------*/
static int
get_channel_pin(int type)
{
if((ZOUL_SENSORS_ADC1) && (type == ZOUL_SENSORS_ADC1)) {
return SOC_ADC_ADCCON_CH_AIN0 + ADC_SENSORS_ADC1_PIN;
}
if((ZOUL_SENSORS_ADC2) && (type == ZOUL_SENSORS_ADC2)) {
return SOC_ADC_ADCCON_CH_AIN0 + ADC_SENSORS_ADC2_PIN;
}
if((ZOUL_SENSORS_ADC3) && (type == ZOUL_SENSORS_ADC3)) {
return SOC_ADC_ADCCON_CH_AIN0 + ADC_SENSORS_ADC3_PIN;
}
if((ZOUL_SENSORS_ADC4) && (type == ZOUL_SENSORS_ADC4)) {
return SOC_ADC_ADCCON_CH_AIN0 + ADC_SENSORS_ADC4_PIN;
}
if((ZOUL_SENSORS_ADC5) && (type == ZOUL_SENSORS_ADC5)) {
return SOC_ADC_ADCCON_CH_AIN0 + ADC_SENSORS_ADC5_PIN;
}
if((ZOUL_SENSORS_ADC6) && (type == ZOUL_SENSORS_ADC6)) {
return SOC_ADC_ADCCON_CH_AIN0 + ADC_SENSORS_ADC6_PIN;
}
return ZOUL_SENSORS_ERROR;
}
/*---------------------------------------------------------------------------*/
static int
value(int type)
{
int channel;
int16_t res;
if(!(type & enabled_channels)) {
PRINTF("ADC: channel not enabled\n");
return ZOUL_SENSORS_ERROR;
}
channel = get_channel_pin(type);
if(channel == ZOUL_SENSORS_ERROR) {
PRINTF("ADC: pin not active\n");
return ZOUL_SENSORS_ERROR;
}
res = adc_get(channel, ADC_SENSORS_REFERENCE, decimation_rate);
/* Only allow negative values if using differential input */
if((ADC_SENSORS_REFERENCE != SOC_ADC_ADCCON_REF_EXT_DIFF) && (res < 0)) {
res = 0;
}
return res;
}
/*---------------------------------------------------------------------------*/
static int
configure(int type, int value)
{
switch(type) {
case SENSORS_HW_INIT:
/* This should filter out disabled sensors as its value should be zero */
if((value < ZOUL_SENSORS_ADC_MIN) || (value > ZOUL_SENSORS_ADC_ALL)) {
PRINTF("ADC: invalid adc pin mask (0x%02X)\n", value);
return ZOUL_SENSORS_ERROR;
}
GPIO_SOFTWARE_CONTROL(GPIO_A_BASE, value);
GPIO_SET_INPUT(GPIO_A_BASE, value);
if(value & ZOUL_SENSORS_ADC1) {
ioc_set_over(GPIO_A_NUM, ADC_SENSORS_ADC1_PIN, IOC_OVERRIDE_ANA);
}
if(value & ZOUL_SENSORS_ADC2) {
ioc_set_over(GPIO_A_NUM, ADC_SENSORS_ADC2_PIN, IOC_OVERRIDE_ANA);
}
if(value & ZOUL_SENSORS_ADC3) {
ioc_set_over(GPIO_A_NUM, ADC_SENSORS_ADC3_PIN, IOC_OVERRIDE_ANA);
}
if(value & ZOUL_SENSORS_ADC4) {
ioc_set_over(GPIO_A_NUM, ADC_SENSORS_ADC4_PIN, IOC_OVERRIDE_ANA);
}
if(value & ZOUL_SENSORS_ADC5) {
ioc_set_over(GPIO_A_NUM, ADC_SENSORS_ADC5_PIN, IOC_OVERRIDE_ANA);
}
if(value & ZOUL_SENSORS_ADC6) {
ioc_set_over(GPIO_A_NUM, ADC_SENSORS_ADC6_PIN, IOC_OVERRIDE_ANA);
}
adc_init();
set_decimation_rate(SOC_ADC_ADCCON_DIV_512);
enabled_channels |= value;
PRINTF("ADC: enabled channels 0x%02X\n", enabled_channels);
break;
case ZOUL_SENSORS_CONFIGURE_TYPE_DECIMATION_RATE:
return set_decimation_rate((uint8_t)value);
default:
return ZOUL_SENSORS_ERROR;
}
return 0;
}
/*---------------------------------------------------------------------------*/
static int
status(int type)
{
return 1;
}
/*---------------------------------------------------------------------------*/
SENSORS_SENSOR(adc_zoul, ADC_ZOUL, value, configure, status);
/*---------------------------------------------------------------------------*/
/** @} */