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/*
* This file is subject to the terms of the GFX License. If a copy of
* the license was not distributed with this file, you can obtain one at:
*
* http://ugfx.io/license.html
*/
/**
* @file drivers/gadc/AT91SAM7/gadc_lld.c
* @brief GADC - Periodic ADC driver source file for the AT91SAM7 cpu.
*/
#include "gfx.h"
#if GFX_USE_GADC
#include "../../../src/gadc/gadc_driver.h"
static uint32_t nextfreq;
// Forward references to ISR routines
static void ISR_CompleteI(ADCDriver *adcp, adcsample_t *buffer, size_t n);
static void ISR_ErrorI(ADCDriver *adcp, adcerror_t err);
static ADCConversionGroup acg = {
FALSE, // circular
1, // num_channels
ISR_CompleteI, // end_cb
ISR_ErrorI, // error_cb
0, // channelselects
0, // trigger
0, // frequency
};
static void ISR_CompleteI(ADCDriver *adcp, adcsample_t *buffer, size_t n) {
(void) adcp;
(void) buffer;
gadcGotDataI(n);
}
static void ISR_ErrorI(ADCDriver *adcp, adcerror_t err) {
(void) adcp;
(void) err;
gadcGotDataI(0);
}
void gadc_lld_init(void) {
adcStart(&ADCD1, 0);
}
size_t gadc_lld_samplesperconversion(uint32_t physdev) {
size_t samples;
for(samples = 0; physdev; physdev >>= 1)
if (physdev & 0x01)
samples++;
return samples;
}
void gadc_lld_start_timerI(uint32_t frequency) {
// Nothing to do here - the AT91SAM7 adc driver uses an internal timer
// which is set up when the job is started. We save this here just to
// indicate the timer should be re-initialised on the next timer job
nextfreq = frequency;
}
void gadc_lld_stop_timerI(void) {
// Nothing to do here. The AT91SAM7 adc driver automatically turns off timer interrupts
// on completion of the job
}
void gadc_lld_timerjobI(GadcTimerJob *pj) {
acg.channelselects = pj->physdev;
acg.trigger = ADC_TRIGGER_TIMER;
acg.frequency = nextfreq;
nextfreq = 0; // Next job use the same timer
adcStartConversionI(&ADCD1, &acg, pj->buffer, pj->todo);
}
void gadc_lld_nontimerjobI(GadcNonTimerJob *pj) {
acg.channelselects = pj->physdev;
acg.trigger = ADC_TRIGGER_SOFTWARE;
adcStartConversionI(&ADCD1, &acg, pj->buffer, 1);
}
#endif /* GFX_USE_GADC */
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