mirror of
https://github.com/oliverschmidt/contiki.git
synced 2024-11-19 03:05:14 +00:00
100 lines
3.5 KiB
C
100 lines
3.5 KiB
C
/*
|
|
* Copyright (c) 2013, ADVANSEE - http://www.advansee.com/
|
|
* Benoît Thébaudeau <benoit.thebaudeau@advansee.com>
|
|
* 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 cc2538-adc
|
|
* @{
|
|
*
|
|
* \file
|
|
* Implementation of the cc2538 ADC driver
|
|
*/
|
|
#include "contiki.h"
|
|
#include "dev/soc-adc.h"
|
|
#include "dev/cctest.h"
|
|
#include "dev/rfcore-xreg.h"
|
|
#include "dev/adc.h"
|
|
#include "reg.h"
|
|
|
|
#include <stdint.h>
|
|
|
|
/*---------------------------------------------------------------------------*/
|
|
void
|
|
adc_init(void)
|
|
{
|
|
/* Start conversions only manually */
|
|
REG(SOC_ADC_ADCCON1) |= SOC_ADC_ADCCON1_STSEL;
|
|
}
|
|
/*---------------------------------------------------------------------------*/
|
|
int16_t
|
|
adc_get(uint8_t channel, uint8_t ref, uint8_t div)
|
|
{
|
|
uint32_t cctest_tr0, rfcore_xreg_atest;
|
|
int16_t res;
|
|
|
|
/* On-chip temperature sensor */
|
|
if(channel == SOC_ADC_ADCCON_CH_TEMP) {
|
|
/* Connect the temperature sensor to the ADC */
|
|
cctest_tr0 = REG(CCTEST_TR0);
|
|
REG(CCTEST_TR0) = cctest_tr0 | CCTEST_TR0_ADCTM;
|
|
|
|
/* Enable the temperature sensor */
|
|
rfcore_xreg_atest = REG(RFCORE_XREG_ATEST);
|
|
REG(RFCORE_XREG_ATEST) = (rfcore_xreg_atest & ~RFCORE_XREG_ATEST_ATEST_CTRL) |
|
|
RFCORE_XREG_ATEST_ATEST_CTRL_TEMP;
|
|
}
|
|
|
|
/* Start a single extra conversion with the given parameters */
|
|
REG(SOC_ADC_ADCCON3) = (REG(SOC_ADC_ADCCON3) &
|
|
~(SOC_ADC_ADCCON3_EREF | SOC_ADC_ADCCON3_EDIV | SOC_ADC_ADCCON3_ECH)) |
|
|
ref | div | channel;
|
|
|
|
/* Poll until end of conversion */
|
|
while(!(REG(SOC_ADC_ADCCON1) & SOC_ADC_ADCCON1_EOC));
|
|
|
|
/* Read conversion result, reading SOC_ADC_ADCH last to clear
|
|
* SOC_ADC_ADCCON1.EOC */
|
|
res = REG(SOC_ADC_ADCL) & 0xfc;
|
|
res |= REG(SOC_ADC_ADCH) << 8;
|
|
|
|
/* On-chip temperature sensor */
|
|
if(channel == SOC_ADC_ADCCON_CH_TEMP) {
|
|
/* Restore the initial temperature sensor state and connection (better for
|
|
* power consumption) */
|
|
REG(RFCORE_XREG_ATEST) = rfcore_xreg_atest;
|
|
REG(CCTEST_TR0) = cctest_tr0;
|
|
}
|
|
|
|
/* Return conversion result */
|
|
return res;
|
|
}
|
|
|
|
/** @} */
|