103 lines
2.9 KiB
C
103 lines
2.9 KiB
C
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/*
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ChibiOS/GFX - Copyright (C) 2012, 2013
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Joel Bodenmann aka Tectu <joel@unormal.org>
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This file is part of ChibiOS/GFX.
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ChibiOS/GFX is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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ChibiOS/GFX is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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/**
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* @file include/gadc/lld/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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* @defgroup Driver Driver
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* @ingroup GADC
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* @{
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*/
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#include "ch.h"
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#include "hal.h"
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#include "gfx.h"
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#if GFX_USE_GADC
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#include "gadc/lld/gadc_lld.h"
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static ADCConversionGroup acg = {
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FALSE, // circular
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1, // num_channels
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GADC_ISR_CompleteI, // end_cb
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GADC_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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void gadc_lld_init(void) {
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adcStart(&ADCD1, NULL);
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}
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size_t gadc_lld_samples_per_conversion(uint32_t physdev) {
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size_t cnt;
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int i;
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/* The AT91SAM7 has AD0..7 - physdev is a bitmap of those channels */
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for(cnt = 0, i = 0; i < 8; i++, physdev >>= 1)
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if (physdev & 0x01)
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cnt++;
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return cnt;
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}
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void gadc_lld_start_timer(uint32_t physdev, uint32_t frequency) {
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(void) physdev;
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/**
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* The AT91SAM7 ADC driver supports triggering the ADC using a timer without having to implement
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* an interrupt handler for the timer. The driver also initialises the timer correctly for us.
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* Because we aren't trapping the interrupt ourselves we can't increment GADC_Timer_Missed if an
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* interrupt is missed.
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*/
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acg.frequency = frequency;
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}
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void gadc_lld_stop_timer(uint32_t physdev) {
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(void) physdev;
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if ((acg.trigger & ~ADC_TRIGGER_SOFTWARE) == ADC_TRIGGER_TIMER)
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adcStop(&ADCD1);
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}
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void gadc_lld_adc_timerI(GadcLldTimerData *pgtd) {
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/**
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* We don't need to calculate num_channels because the AT91SAM7 ADC does this for us.
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*/
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acg.channelselects = pgtd->physdev;
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acg.trigger = pgtd->now ? (ADC_TRIGGER_TIMER|ADC_TRIGGER_SOFTWARE) : ADC_TRIGGER_TIMER;
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adcStartConversionI(&ADCD1, &acg, pgtd->buffer, pgtd->count);
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/* Next time assume the same (still running) timer */
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acg.frequency = 0;
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}
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void gadc_lld_adc_nontimerI(GadcLldNonTimerData *pgntd) {
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/**
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* We don't need to calculate num_channels because the AT91SAM7 ADC does this for us.
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*/
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acg.channelselects = pgntd->physdev;
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acg.trigger = ADC_TRIGGER_SOFTWARE;
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adcStartConversionI(&ADCD1, &acg, pgntd->buffer, 1);
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}
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#endif /* GFX_USE_GADC */
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/** @} */
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