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/*
ChibiOS/RT - Copyright (C) 2006-2013 Giovanni Di Sirio
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
/**
* @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) || (SAM7_PLATFORM == SAM7A3)
/**
* @brief EXTDB driver identifier.
*/
EXTDriver EXTDB;
#endif
/*===========================================================================*/
/* Driver local variables and types. */
/*===========================================================================*/
/*===========================================================================*/
/* 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 < EXT_MAX_CHANNELS; 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) || (SAM7_PLATFORM == SAM7A3)
/**
* @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) || (SAM7_PLATFORM == SAM7A3)
/* 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) || (SAM7_PLATFORM == SAM7A3)
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) {
chDbgCheck((extp->config->channels[channel].cb != NULL),
"Call back pointer can not be NULL");
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 */
/** @} */
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