124 lines
4 KiB
C
124 lines
4 KiB
C
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/*
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* Copyright (c) 2011, George Oikonomou - <oikonomou@users.sourceforge.net>
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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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* This file is part of the Contiki operating system.
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*/
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/**
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* \file
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* ADC sensor module for TI SmartRF05EB devices.
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*
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* \author
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* George Oikonomou - <oikonomou@users.sourceforge.net>
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*/
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#include "sfr-bits.h"
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#include "cc253x.h"
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#include "adc-sensor.h"
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#if ADC_SENSOR_ON
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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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uint16_t reading;
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/*
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* For single-shot AD conversions, we may only write to ADCCON3[3:0] once
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* (This write triggers the conversion). We thus use the variable 'command'
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* to store intermediate steps (reference, decimation rate, input channel)
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*/
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uint8_t command;
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/* 1.25V ref, max decimation rate */
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command = ADCCON3_EDIV1 | ADCCON3_EDIV0;
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/* Clear the Interrupt Flag */
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ADCIF = 0;
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/* Depending on the desired reading, append the input bits to 'command' and
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* enable the corresponding input channel in ADCCFG if necessary */
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switch(type) {
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#if TEMP_SENSOR_ON
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case ADC_SENSOR_TYPE_TEMP:
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command |= ADCCON3_ECH3 | ADCCON3_ECH2 | ADCCON3_ECH1;
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break;
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#endif
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#if VDD_SENSOR_ON
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case ADC_SENSOR_TYPE_VDD:
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command |= ADCCON3_ECH3 | ADCCON3_ECH2 | ADCCON3_ECH1 | ADCCON3_ECH0;
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break;
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#endif
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default:
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/* If the sensor is not present or disabled in conf, return -1 */
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return -1;
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}
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/* Writing in bits 3:0 of ADCCON3 will trigger a single conversion */
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ADCCON3 = command;
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/*
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* When the conversion is complete, the ADC interrupt flag is set. We don't
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* use an ISR here, we just wait on the flag and clear it afterwards.
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*/
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while(!ADCIF);
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/* Clear the Interrupt Flag */
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ADCIF = 0;
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reading = ADCL;
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reading |= (((uint8_t) ADCH) << 8);
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/* 12-bit decimation rate: 4 LS bits are noise */
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reading >>= 4;
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return reading;
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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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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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#if TEMP_SENSOR_ON
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/* Connect temperature sensor to the SoC */
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ATEST = 1;
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TR0 = 1;
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#endif
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APCFG = 0; /* Disables Input Channels */
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break;
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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_sensor, ADC_SENSOR, value, configure, status);
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#endif /* ADC_SENSOR_ON */
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