osd-contiki/platform/seedeye/dev/battery-sensor.c

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/*
* Contiki SeedEye Platform project
*
* Copyright (c) 2012,
* Scuola Superiore Sant'Anna (http://www.sssup.it) and
* Consorzio Nazionale Interuniversitario per le Telecomunicazioni
* (http://www.cnit.it).
*
* 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 Institute 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 INSTITUTE 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 INSTITUTE 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 SeedEye Contiki SEEDEYE Platform
*
* @{
*/
/**
* \file battery-sensor.c
* \brief Battery Sensor
* \author Giovanni Pellerano <giovanni.pellerano@evilaliv3.org>
* \date 2012-07-04
*/
#include <dev/battery-sensor.h>
#include <p32xxxx.h>
/*---------------------------------------------------------------------------*/
PROCESS(battery_process, "battery sensor");
/*---------------------------------------------------------------------------*/
const struct sensors_sensor battery_sensor;
#define BATTERY_SAMPLES 10
static uint16_t battery_samples[BATTERY_SAMPLES];
static uint8_t counter = 0;
static uint8_t sensor_status = 0;
/*---------------------------------------------------------------------------*/
static int
value(int type)
{
uint32_t tmp = 0;
uint8_t i;
for(i = 0; i < BATTERY_SAMPLES; ++i) {
tmp += battery_samples[i];
}
return tmp / BATTERY_SAMPLES;
}
/*---------------------------------------------------------------------------*/
static int
configure(int type, int c)
{
// all PORTB = Digital; RB10 = analog
AD1PCFG = 0b1111110111111111;
// SSRC bit = 111 implies internal counter ends sampling and starts converting
AD1CON1 = 0b0000000011100000;
AD1CHS = 0b00000000000010100000000000000000;
AD1CSSL = 0;
// Manual Sample, Tad = internal 6 TPB
AD1CON3 = 0x1F02;
AD1CON2 = 0;
// Turn ADC on
AD1CON1SET = 0b1000000000000000;
process_start(&battery_process, NULL);
sensor_status = 1;
return 0;
}
/*---------------------------------------------------------------------------*/
static int
status(int type)
{
return sensor_status;
}
/*---------------------------------------------------------------------------*/
SENSORS_SENSOR(battery_sensor, BATTERY_SENSOR, value, configure, status);
/*---------------------------------------------------------------------------*/
PROCESS_THREAD(battery_process, ev, data)
{
PROCESS_BEGIN();
while(1) {
static struct etimer et;
etimer_set(&et, CLOCK_SECOND);
PROCESS_WAIT_EVENT_UNTIL(etimer_expired(&et));
// start converting
AD1CON1SET = 0b0000000000000010;
while(!(AD1CON1 & 0b0000000000000001)) {
; // wait conversion finish
}
// read the conversion result
battery_samples[counter] = ADC1BUF0;
counter = (counter + 1) % BATTERY_SAMPLES;
}
PROCESS_END();
}
/** @} */