89 lines
2.1 KiB
C
89 lines
2.1 KiB
C
/*
|
|
* 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 */
|