nes-proj/platform/remote/dev/phidget-sensor.c

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/*
* 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 remote-phidget-sensor
* @{
*
* \file
* Generic driver for the Re-Mote Phidget/ADC sensors
*/
/*---------------------------------------------------------------------------*/
#include "contiki.h"
#include "sys/clock.h"
#include "dev/ioc.h"
#include "dev/gpio.h"
#include "dev/adc.h"
#include "dev/phidget-sensor.h"
#include "dev/remote-sensors.h"
#include <stdint.h>
/*---------------------------------------------------------------------------*/
#define ADC_PHIDGET_PORT_BASE GPIO_PORT_TO_BASE(ADC_PHIDGET_PORT)
#define ADC_PHIDGET_ADC2_PIN_MASK GPIO_PIN_MASK(ADC_PHIDGET_ADC2_PIN)
#define ADC_PHIDGET_ADC3_PIN_MASK GPIO_PIN_MASK(ADC_PHIDGET_ADC3_PIN)
/*---------------------------------------------------------------------------*/
static uint8_t decimation_rate;
/*---------------------------------------------------------------------------*/
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 REMOTE_SENSORS_ERROR;
}
return decimation_rate;
}
/*---------------------------------------------------------------------------*/
static int
value(int type)
{
uint8_t channel;
int16_t res;
switch(type) {
case PHIDGET_SENSORS_ADC2:
channel = SOC_ADC_ADCCON_CH_AIN0 + ADC_PHIDGET_ADC2_PIN;
break;
case PHIDGET_SENSORS_ADC3:
channel = SOC_ADC_ADCCON_CH_AIN0 + ADC_PHIDGET_ADC3_PIN;
break;
default:
return REMOTE_SENSORS_ERROR;
}
res = adc_get(channel, SOC_ADC_ADCCON_REF_INT, decimation_rate);
return res;
}
/*---------------------------------------------------------------------------*/
static int
configure(int type, int value)
{
switch(type) {
case SENSORS_HW_INIT:
GPIO_SOFTWARE_CONTROL(GPIO_A_BASE, ADC_PHIDGET_ADC2_PIN_MASK);
GPIO_SET_INPUT(GPIO_A_BASE, ADC_PHIDGET_ADC2_PIN_MASK);
ioc_set_over(GPIO_A_NUM, ADC_PHIDGET_ADC2_PIN, IOC_OVERRIDE_ANA);
GPIO_SOFTWARE_CONTROL(GPIO_A_BASE, ADC_PHIDGET_ADC3_PIN_MASK);
GPIO_SET_INPUT(GPIO_A_BASE, ADC_PHIDGET_ADC3_PIN_MASK);
ioc_set_over(GPIO_A_NUM, ADC_PHIDGET_ADC3_PIN, IOC_OVERRIDE_ANA);
adc_init();
set_decimation_rate(SOC_ADC_ADCCON_DIV_512);
break;
case REMOTE_SENSORS_CONFIGURE_TYPE_DECIMATION_RATE:
return set_decimation_rate((uint8_t)value);
}
return 0;
}
/*---------------------------------------------------------------------------*/
static int
status(int type)
{
return 1;
}
/*---------------------------------------------------------------------------*/
SENSORS_SENSOR(phidget_sensor, PHIDGET_SENSOR, value, configure, status);
/*---------------------------------------------------------------------------*/
/** @} */