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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/>.
*/
/**
* @file STM32/ext_lld.c
* @brief STM32 EXT subsystem low level driver source.
*
* @addtogroup EXT
* @{
*/
#include "ch.h"
#include "hal.h"
#if HAL_USE_EXT || defined(__DOXYGEN__)
#include "ext_lld_isr.h"
/*===========================================================================*/
/* Driver local definitions. */
/*===========================================================================*/
/*===========================================================================*/
/* Driver exported variables. */
/*===========================================================================*/
/**
* @brief EXTD1 driver identifier.
*/
EXTDriver EXTD1;
/*===========================================================================*/
/* Driver local variables. */
/*===========================================================================*/
/*===========================================================================*/
/* Driver local functions. */
/*===========================================================================*/
/*===========================================================================*/
/* Driver interrupt handlers. */
/*===========================================================================*/
/*===========================================================================*/
/* Driver exported functions. */
/*===========================================================================*/
/**
* @brief Low level EXT driver initialization.
*
* @notapi
*/
void ext_lld_init(void) {
/* Driver initialization.*/
extObjectInit(&EXTD1);
}
/**
* @brief Configures and activates the EXT peripheral.
*
* @param[in] extp pointer to the @p EXTDriver object
*
* @notapi
*/
void ext_lld_start(EXTDriver *extp) {
unsigned i;
if (extp->state == EXT_STOP)
ext_lld_exti_irq_enable();
/* Configuration of automatic channels.*/
for (i = 0; i < EXT_MAX_CHANNELS; i++)
if (extp->config->channels[i].mode & EXT_CH_MODE_AUTOSTART)
ext_lld_channel_enable(extp, i);
else
ext_lld_channel_disable(extp, i);
}
/**
* @brief Deactivates the EXT peripheral.
*
* @param[in] extp pointer to the @p EXTDriver object
*
* @notapi
*/
void ext_lld_stop(EXTDriver *extp) {
if (extp->state == EXT_ACTIVE)
ext_lld_exti_irq_disable();
EXTI->EMR = 0;
EXTI->IMR = 0;
EXTI->PR = EXT_CHANNELS_MASK;
}
/**
* @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) {
/* Programming edge registers.*/
if (extp->config->channels[channel].mode & EXT_CH_MODE_RISING_EDGE)
EXTI->RTSR |= (1 << channel);
else
EXTI->RTSR &= ~(1 << channel);
if (extp->config->channels[channel].mode & EXT_CH_MODE_FALLING_EDGE)
EXTI->FTSR |= (1 << channel);
else
EXTI->FTSR &= ~(1 << channel);
/* Programming interrupt and event registers.*/
if (extp->config->channels[channel].cb != NULL) {
EXTI->IMR |= (1 << channel);
EXTI->EMR &= ~(1 << channel);
}
else {
EXTI->EMR |= (1 << channel);
EXTI->IMR &= ~(1 << channel);
}
/* Setting the associated GPIO for external channels.*/
if (channel < 16) {
uint32_t n = channel >> 2;
uint32_t mask = ~(0xF << ((channel & 3) * 4));
uint32_t port = ((extp->config->channels[channel].mode &
EXT_MODE_GPIO_MASK) >>
EXT_MODE_GPIO_OFF) << ((channel & 3) * 4);
#if defined(STM32L1XX_MD) || defined(STM32F0XX) || defined(STM32F2XX) || \
defined(STM32F4XX)
SYSCFG->EXTICR[n] = (SYSCFG->EXTICR[n] & mask) | port;
#else /* STM32F1XX */
AFIO->EXTICR[n] = (AFIO->EXTICR[n] & mask) | port;
#endif /* STM32F1XX */
}
}
/**
* @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) {
(void)extp;
EXTI->IMR &= ~(1 << channel);
EXTI->EMR &= ~(1 << channel);
EXTI->RTSR &= ~(1 << channel);
EXTI->FTSR &= ~(1 << channel);
EXTI->PR = (1 << channel);
}
#endif /* HAL_USE_EXT */
/** @} */
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