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/*
ChibiOS - Copyright (C) 2006..2016 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 STM32/EXTIv1/ext_lld.c
* @brief STM32 EXT subsystem low level driver source.
*
* @addtogroup EXT
* @{
*/
#include "hal.h"
#if HAL_USE_EXT || defined(__DOXYGEN__)
/*===========================================================================*/
/* Driver local definitions. */
/*===========================================================================*/
/* Handling a difference in ST headers.*/
#if defined(STM32L4XX)
#define EMR EMR1
#define IMR IMR1
#define PR PR1
#define RTSR RTSR1
#define FTSR FTSR1
#endif
/*===========================================================================*/
/* Driver exported variables. */
/*===========================================================================*/
/**
* @brief EXTD1 driver identifier.
*/
EXTDriver EXTD1;
/*===========================================================================*/
/* Driver local variables and types. */
/*===========================================================================*/
/*===========================================================================*/
/* 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) {
expchannel_t line;
if (extp->state == EXT_STOP)
ext_lld_exti_irq_enable();
/* Configuration of automatic channels.*/
for (line = 0; line < EXT_MAX_CHANNELS; line++)
if (extp->config->channels[line].mode & EXT_CH_MODE_AUTOSTART)
ext_lld_channel_enable(extp, line);
else
ext_lld_channel_disable(extp, line);
}
/**
* @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 = STM32_EXTI_IMR_MASK;
EXTI->PR = ~STM32_EXTI_IMR_MASK;
#if STM32_EXTI_NUM_LINES > 32
EXTI->IMR2 = STM32_EXTI_IMR2_MASK;
EXTI->PR2 = ~STM32_EXTI_IMR2_MASK;
#endif
}
/**
* @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) {
uint32_t cmask = (1 << (channel & 0x1F));
/* 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(STM32F1XX)
AFIO->EXTICR[n] = (AFIO->EXTICR[n] & mask) | port;
#else /* !defined(STM32F1XX) */
SYSCFG->EXTICR[n] = (SYSCFG->EXTICR[n] & mask) | port;
#endif /* !defined(STM32F1XX) */
}
#if STM32_EXTI_NUM_LINES > 32
if (channel < 32) {
#endif
/* Masked out lines must not be touched by this driver.*/
if ((cmask & STM32_EXTI_IMR_MASK) != 0U) {
return;
}
/* Programming edge registers.*/
if (extp->config->channels[channel].mode & EXT_CH_MODE_RISING_EDGE)
EXTI->RTSR |= cmask;
else
EXTI->RTSR &= ~cmask;
if (extp->config->channels[channel].mode & EXT_CH_MODE_FALLING_EDGE)
EXTI->FTSR |= cmask;
else
EXTI->FTSR &= ~cmask;
/* Programming interrupt and event registers.*/
if (extp->config->channels[channel].cb != NULL) {
EXTI->IMR |= cmask;
EXTI->EMR &= ~cmask;
}
else {
EXTI->EMR |= cmask;
EXTI->IMR &= ~cmask;
}
#if STM32_EXTI_NUM_LINES > 32
}
else {
/* Masked out lines must not be touched by this driver.*/
if ((cmask & STM32_EXTI_IMR2_MASK) != 0U) {
return;
}
/* Programming edge registers.*/
if (extp->config->channels[channel].mode & EXT_CH_MODE_RISING_EDGE)
EXTI->RTSR2 |= cmask;
else
EXTI->RTSR2 &= ~cmask;
if (extp->config->channels[channel].mode & EXT_CH_MODE_FALLING_EDGE)
EXTI->FTSR2 |= cmask;
else
EXTI->FTSR2 &= ~cmask;
/* Programming interrupt and event registers.*/
if (extp->config->channels[channel].cb != NULL) {
EXTI->IMR2 |= cmask;
EXTI->EMR2 &= ~cmask;
}
else {
EXTI->EMR2 |= cmask;
EXTI->IMR2 &= ~cmask;
}
}
#endif
}
/**
* @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) {
uint32_t cmask = (1 << (channel & 0x1F));
(void)extp;
#if STM32_EXTI_NUM_LINES > 32
if (channel < 32) {
#endif
EXTI->IMR &= ~cmask;
EXTI->EMR &= ~cmask;
EXTI->RTSR &= ~cmask;
EXTI->FTSR &= ~cmask;
EXTI->PR = cmask;
#if STM32_EXTI_NUM_LINES > 32
}
else {
EXTI->IMR2 &= ~cmask;
EXTI->EMR2 &= ~cmask;
EXTI->RTSR2 &= ~cmask;
EXTI->FTSR2 &= ~cmask;
EXTI->PR2 = cmask;
}
#endif
}
#endif /* HAL_USE_EXT */
/** @} */
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