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