112 lines
3.1 KiB
C
112 lines
3.1 KiB
C
/*
|
|
* This source code form is a part of the ChibiOS/GFX project and stands
|
|
* under the terms of the GFX License v1.0. If a copy of the license
|
|
* was not distributed with this file, You can obtain one at:
|
|
*
|
|
* http://chibios-gfx.com/license.html
|
|
*
|
|
*/
|
|
|
|
/*
|
|
ChibiOS/GFX - Copyright (C) 2012, 2013
|
|
Joel Bodenmann aka Tectu <joel@unormal.org>
|
|
|
|
This file is part of ChibiOS/GFX.
|
|
|
|
ChibiOS/GFX 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/GFX 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 drivers/gadc/AT91SAM7/gadc_lld.c
|
|
* @brief GADC - Periodic ADC driver source file for the AT91SAM7 cpu.
|
|
*
|
|
* @defgroup Driver Driver
|
|
* @ingroup GADC
|
|
* @{
|
|
*/
|
|
|
|
#include "ch.h"
|
|
#include "hal.h"
|
|
#include "gfx.h"
|
|
|
|
#if GFX_USE_GADC
|
|
|
|
#include "gadc/lld/gadc_lld.h"
|
|
|
|
static ADCConversionGroup acg = {
|
|
FALSE, // circular
|
|
1, // num_channels
|
|
GADC_ISR_CompleteI, // end_cb
|
|
GADC_ISR_ErrorI, // error_cb
|
|
0, // channelselects
|
|
0, // trigger
|
|
0, // frequency
|
|
};
|
|
|
|
void gadc_lld_init(void) {
|
|
adcStart(&ADCD1, NULL);
|
|
}
|
|
|
|
size_t gadc_lld_samples_per_conversion(uint32_t physdev) {
|
|
size_t cnt;
|
|
int i;
|
|
|
|
/* The AT91SAM7 has AD0..7 - physdev is a bitmap of those channels */
|
|
for(cnt = 0, i = 0; i < 8; i++, physdev >>= 1)
|
|
if (physdev & 0x01)
|
|
cnt++;
|
|
return cnt;
|
|
}
|
|
|
|
void gadc_lld_start_timer(uint32_t physdev, uint32_t frequency) {
|
|
(void) physdev;
|
|
/**
|
|
* The AT91SAM7 ADC driver supports triggering the ADC using a timer without having to implement
|
|
* an interrupt handler for the timer. The driver also initialises the timer correctly for us.
|
|
* Because we aren't trapping the interrupt ourselves we can't increment GADC_Timer_Missed if an
|
|
* interrupt is missed.
|
|
*/
|
|
acg.frequency = frequency;
|
|
}
|
|
|
|
void gadc_lld_stop_timer(uint32_t physdev) {
|
|
(void) physdev;
|
|
if ((acg.trigger & ~ADC_TRIGGER_SOFTWARE) == ADC_TRIGGER_TIMER)
|
|
adcStop(&ADCD1);
|
|
}
|
|
|
|
void gadc_lld_adc_timerI(GadcLldTimerData *pgtd) {
|
|
/**
|
|
* We don't need to calculate num_channels because the AT91SAM7 ADC does this for us.
|
|
*/
|
|
acg.channelselects = pgtd->physdev;
|
|
acg.trigger = pgtd->now ? (ADC_TRIGGER_TIMER|ADC_TRIGGER_SOFTWARE) : ADC_TRIGGER_TIMER;
|
|
|
|
adcStartConversionI(&ADCD1, &acg, pgtd->buffer, pgtd->count);
|
|
|
|
/* Next time assume the same (still running) timer */
|
|
acg.frequency = 0;
|
|
}
|
|
|
|
void gadc_lld_adc_nontimerI(GadcLldNonTimerData *pgntd) {
|
|
/**
|
|
* We don't need to calculate num_channels because the AT91SAM7 ADC does this for us.
|
|
*/
|
|
acg.channelselects = pgntd->physdev;
|
|
acg.trigger = ADC_TRIGGER_SOFTWARE;
|
|
adcStartConversionI(&ADCD1, &acg, pgntd->buffer, 1);
|
|
}
|
|
|
|
#endif /* GFX_USE_GADC */
|
|
/** @} */
|