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