ext_lld.c
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/*
ChibiOS/RT - Copyright (C) 2006,2007,2008,2009,2010,
2011,2012 Giovanni Di Sirio.
This file is part of ChibiOS/RT.
ChibiOS/RT 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/RT 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/>.
---
A special exception to the GPL can be applied should you wish to distribute
a combined work that includes ChibiOS/RT, without being obliged to provide
the source code for any proprietary components. See the file exception.txt
for full details of how and when the exception can be applied.
*/
/**
* @file AT91SAM7/ext_lld.c
* @brief AT91SAM7 EXT subsystem low level driver source.
*
* @addtogroup EXT
* @{
*/
#include "ch.h"
#include "hal.h"
#if HAL_USE_EXT || defined(__DOXYGEN__)
/*===========================================================================*/
/* Driver local definitions. */
/*===========================================================================*/
/*===========================================================================*/
/* Driver exported variables. */
/*===========================================================================*/
/**
* @brief EXTDA driver identifier.
*/
EXTDriver EXTDA;
#if (SAM7_PLATFORM == SAM7X128) || (SAM7_PLATFORM == SAM7X256) || \
(SAM7_PLATFORM == SAM7X512)
/**
* @brief EXTDB driver identifier.
*/
EXTDriver EXTDB;
#endif
/*===========================================================================*/
/* Driver local variables. */
/*===========================================================================*/
/*===========================================================================*/
/* Driver local functions. */
/*===========================================================================*/
/**
* @brief Handles external interrupts.
*
* @param[in] extp pointer to the driver that received the interrupt
*/
static void ext_lld_serveInterrupt(EXTDriver *extp) {
uint32_t irqFlags;
uint32_t ch;
chSysLockFromIsr();
/* Read flags of pending PIO interrupts.*/
irqFlags = extp->pio->PIO_ISR;
/* Call callback function for any pending interrupt.*/
for(ch = 0; ch < 32; ch++) {
/* Check if the channel is activated and if its IRQ flag is set.*/
if((extp->config->channels[ch].mode &
EXT_CH_MODE_ENABLED & EXT_CH_MODE_EDGES_MASK)
&& ((1 << ch) & irqFlags)) {
(extp->config->channels[ch].cb)(extp, ch);
}
}
chSysUnlockFromIsr();
AT91C_BASE_AIC->AIC_EOICR = 0;
}
/*===========================================================================*/
/* Driver interrupt handlers. */
/*===========================================================================*/
/**
* @brief EXTI[0] interrupt handler.
*
* @isr
*/
CH_IRQ_HANDLER(EXTIA_IRQHandler) {
CH_IRQ_PROLOGUE();
ext_lld_serveInterrupt(&EXTDA);
CH_IRQ_EPILOGUE();
}
#if (SAM7_PLATFORM == SAM7X128) || (SAM7_PLATFORM == SAM7X256) || \
(SAM7_PLATFORM == SAM7X512)
/**
* @brief EXTI[1] interrupt handler.
*
* @isr
*/
CH_IRQ_HANDLER(EXTIB_IRQHandler) {
CH_IRQ_PROLOGUE();
ext_lld_serveInterrupt(&EXTDB);
CH_IRQ_EPILOGUE();
}
#endif
/*===========================================================================*/
/* Driver exported functions. */
/*===========================================================================*/
/**
* @brief Low level EXT driver initialization.
*
* @notapi
*/
void ext_lld_init(void) {
/* Driver initialization.*/
extObjectInit(&EXTDA);
/* Set PIO base addresses.*/
EXTDA.pio = AT91C_BASE_PIOA;
/* Set peripheral IDs.*/
EXTDA.pid = AT91C_ID_PIOA;
#if (SAM7_PLATFORM == SAM7X128) || (SAM7_PLATFORM == SAM7X256) || \
(SAM7_PLATFORM == SAM7X512)
/* Same for PIOB.*/
extObjectInit(&EXTDB);
EXTDB.pio = AT91C_BASE_PIOB;
EXTDB.pid = AT91C_ID_PIOB;
#endif
}
/**
* @brief Configures and activates the EXT peripheral.
*
* @param[in] extp pointer to the @p EXTDriver object
*
* @notapi
*/
void ext_lld_start(EXTDriver *extp) {
uint16_t ch;
uint32_t ier = 0;
const EXTConfig *config = extp->config;
switch(extp->pid) {
case AT91C_ID_PIOA:
AIC_ConfigureIT(AT91C_ID_PIOA, SAM7_computeSMR(config->mode,
config->priority),
EXTIA_IRQHandler);
break;
#if (SAM7_PLATFORM == SAM7X128) || (SAM7_PLATFORM == SAM7X256) || \
(SAM7_PLATFORM == SAM7X512)
case AT91C_ID_PIOB:
AIC_ConfigureIT(AT91C_ID_PIOB, SAM7_computeSMR(config->mode,
config->priority),
EXTIB_IRQHandler);
break;
#endif
}
/* Enable and Disable channels with respect to config.*/
for(ch = 0; ch < EXT_MAX_CHANNELS; ch++) {
ier |= (config->channels[ch].mode & EXT_CH_MODE_EDGES_MASK & EXT_CH_MODE_ENABLED ? 1 : 0) << ch;
}
extp->pio->PIO_IER = ier;
extp->pio->PIO_IDR = ~ier;
/* Enable interrupt on corresponding PIO port in AIC.*/
AIC_EnableIT(extp->pid);
}
/**
* @brief Deactivates the EXT peripheral.
*
* @param[in] extp pointer to the @p EXTDriver object
*
* @notapi
*/
void ext_lld_stop(EXTDriver *extp) {
/* Disable interrupt on corresponding PIO port in AIC.*/
AIC_DisableIT(extp->pid);
}
/**
* @brief Enables an EXT channel.
*
* @param[in] extp pointer to the @p EXTDriver object
* @param[in] channel channel to be enabled
*
* @notapi
*/
void ext_lld_channel_enable(EXTDriver *extp, expchannel_t channel) {
extp->pio->PIO_IER = (1 << channel);
}
/**
* @brief Disables an EXT channel.
*
* @param[in] extp pointer to the @p EXTDriver object
* @param[in] channel channel to be disabled
*
* @notapi
*/
void ext_lld_channel_disable(EXTDriver *extp, expchannel_t channel) {
extp->pio->PIO_IDR = (1 << channel);
}
#endif /* HAL_USE_EXT */
/** @} */