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/*
ChibiOS/RT - Copyright (C) 2006,2007,2008,2009,2010,
2011,2012 Giovanni Di Sirio.
This file is part of ChibiOS/RT.
ChibiOS/RT is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
ChibiOS/RT is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
/**
* @file templates/adc_lld.c
* @brief ADC Driver subsystem low level driver source template.
*
* @addtogroup ADC
* @{
*/
#include "ch.h"
#include "hal.h"
#if HAL_USE_ADC || defined(__DOXYGEN__)
/*===========================================================================*/
/* Driver local definitions. */
/*===========================================================================*/
/*===========================================================================*/
/* Driver exported variables. */
/*===========================================================================*/
/** @brief ADC1 driver identifier.*/
#if AVR_ADC_USE_ADC1 || defined(__DOXYGEN__)
ADCDriver ADCD1;
#endif
/*===========================================================================*/
/* Driver local variables. */
/*===========================================================================*/
/*===========================================================================*/
/* Driver local functions. */
/*===========================================================================*/
static size_t getAdcChannelNumberFromMask(uint8_t mask, uint8_t currentChannel)
{
for(uint8_t i = 0; mask>0; i++)
{
if(mask & 0x01)
{
if(!currentChannel)
return i;
currentChannel--;
}
mask >>= 1;
}
/* error, should never reach this line */
}
static void setAdcChannel(uint8_t channelNum)
{
ADMUX = (ADMUX & 0xf8) | (channelNum & 0x07);
}
/*===========================================================================*/
/* Driver interrupt handlers. */
/*===========================================================================*/
#include <util/delay.h>
CH_IRQ_HANDLER(ADC_vect) {
CH_IRQ_PROLOGUE();
uint8_t low = ADCL;
uint8_t high = ADCH;
uint16_t result = (high << 8) | low;
ADCD1.samples[ADCD1.currentBufferPosition] = result;
ADCD1.currentBufferPosition++;
size_t bufferSize = ADCD1.depth * ADCD1.grpp->num_channels;
size_t currentChannel = ADCD1.currentBufferPosition % ADCD1.grpp->num_channels;
size_t currentIteration = ADCD1.currentBufferPosition / ADCD1.grpp->num_channels;
if(ADCD1.grpp-> circular && currentChannel == 0 && currentIteration == ADCD1.depth/2)
{
_adc_isr_half_code(&ADCD1);
}
if(ADCD1.currentBufferPosition == bufferSize)
{
_adc_isr_full_code(&ADCD1);
}
else
{
setAdcChannel(getAdcChannelNumberFromMask(ADCD1.grpp->channelsMask,currentChannel));
ADCSRA |= 1<<ADSC;
}
CH_IRQ_EPILOGUE();
}
/*===========================================================================*/
/* Driver exported functions. */
/*===========================================================================*/
/**
* @brief Low level ADC driver initialization.
*
* @notapi
*/
void adc_lld_init(void) {
adcObjectInit(&ADCD1);
ADCSRA =(1<<ADPS2)|(1<<ADPS1)|(1<<ADPS0) | //prescaler 128, unico valore possibile a 20Mhz
(1<<ADIE) ; //interrupt
ADCSRB=0; //single shot
ADMUX=(0<<REFS1)| (0<<REFS0); //uso aref, vale solo per arduino. arduino ha aref collegato
}
/**
* @brief Configures and activates the ADC peripheral.
*
* @param[in] adcp pointer to the @p ADCDriver object
*
* @notapi
*/
void adc_lld_start(ADCDriver *adcp) {
if (adcp->state == ADC_STOP) {
/* Clock activation.*/
ADCSRA |= (1<<ADEN);
}
if (adcp->config != NULL)
{
ADMUX = (adcp->config->analog_reference << REFS0);
}
}
/**
* @brief Deactivates the ADC peripheral.
*
* @param[in] adcp pointer to the @p ADCDriver object
*
* @notapi
*/
void adc_lld_stop(ADCDriver *adcp) {
if (adcp->state == ADC_READY) {
/* Clock de-activation.*/
ADCSRA &= ~(1<<ADEN);
}
}
/**
* @brief Starts an ADC conversion.
*
* @param[in] adcp pointer to the @p ADCDriver object
*
* @notapi
*/
void adc_lld_start_conversion(ADCDriver *adcp) {
adcp->currentBufferPosition=0;
setAdcChannel(getAdcChannelNumberFromMask(adcp->grpp->channelsMask,0));
ADCSRA |= 1<<ADSC;
}
/**
* @brief Stops an ongoing conversion.
*
* @param[in] adcp pointer to the @p ADCDriver object
*
* @notapi
*/
void adc_lld_stop_conversion(ADCDriver *adcp) {
ADCSRA &= ~(1<<ADSC);
}
#endif /* HAL_USE_ADC */
/** @} */
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