220 lines
6.4 KiB
C
220 lines
6.4 KiB
C
/*
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ChibiOS - Copyright (C) 2006..2015 Giovanni Di Sirio
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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/**
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* @file STM32/ext_lld.c
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* @brief STM32 EXT subsystem low level driver source.
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*
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* @addtogroup EXT
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* @{
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*/
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#include "hal.h"
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#if HAL_USE_EXT || defined(__DOXYGEN__)
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#include "ext_lld_isr.h"
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/*===========================================================================*/
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/* Driver local definitions. */
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/*===========================================================================*/
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/*===========================================================================*/
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/* Driver exported variables. */
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/*===========================================================================*/
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/**
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* @brief EXTD1 driver identifier.
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*/
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EXTDriver EXTD1;
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/*===========================================================================*/
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/* Driver local variables and types. */
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/*===========================================================================*/
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/*===========================================================================*/
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/* Driver local functions. */
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/*===========================================================================*/
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/*===========================================================================*/
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/* Driver interrupt handlers. */
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/*===========================================================================*/
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/*===========================================================================*/
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/* Driver exported functions. */
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/*===========================================================================*/
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/**
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* @brief Low level EXT driver initialization.
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*
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* @notapi
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*/
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void ext_lld_init(void) {
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/* Driver initialization.*/
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extObjectInit(&EXTD1);
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}
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/**
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* @brief Configures and activates the EXT peripheral.
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*
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* @param[in] extp pointer to the @p EXTDriver object
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*
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* @notapi
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*/
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void ext_lld_start(EXTDriver *extp) {
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unsigned i;
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if (extp->state == EXT_STOP)
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ext_lld_exti_irq_enable();
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/* Configuration of automatic channels.*/
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for (i = 0; i < EXT_MAX_CHANNELS; i++)
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if (extp->config->channels[i].mode & EXT_CH_MODE_AUTOSTART)
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ext_lld_channel_enable(extp, i);
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else
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ext_lld_channel_disable(extp, i);
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}
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/**
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* @brief Deactivates the EXT peripheral.
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*
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* @param[in] extp pointer to the @p EXTDriver object
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*
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* @notapi
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*/
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void ext_lld_stop(EXTDriver *extp) {
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if (extp->state == EXT_ACTIVE)
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ext_lld_exti_irq_disable();
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EXTI->EMR = 0;
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EXTI->IMR = 0;
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EXTI->PR = 0xFFFFFFFF;
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#if STM32_EXTI_NUM_CHANNELS > 32
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EXTI->PR2 = 0xFFFFFFFF;
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#endif
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}
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/**
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* @brief Enables an EXT channel.
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*
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* @param[in] extp pointer to the @p EXTDriver object
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* @param[in] channel channel to be enabled
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*
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* @notapi
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*/
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void ext_lld_channel_enable(EXTDriver *extp, expchannel_t channel) {
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/* Setting the associated GPIO for external channels.*/
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if (channel < 16) {
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uint32_t n = channel >> 2;
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uint32_t mask = ~(0xF << ((channel & 3) * 4));
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uint32_t port = ((extp->config->channels[channel].mode &
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EXT_MODE_GPIO_MASK) >>
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EXT_MODE_GPIO_OFF) << ((channel & 3) * 4);
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#if defined(STM32F1XX)
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AFIO->EXTICR[n] = (AFIO->EXTICR[n] & mask) | port;
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#else /* !defined(STM32F1XX) */
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SYSCFG->EXTICR[n] = (SYSCFG->EXTICR[n] & mask) | port;
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#endif /* !defined(STM32F1XX) */
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}
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#if STM32_EXTI_NUM_CHANNELS > 32
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if (channel < 32) {
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#endif
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/* Programming edge registers.*/
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if (extp->config->channels[channel].mode & EXT_CH_MODE_RISING_EDGE)
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EXTI->RTSR |= (1 << channel);
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else
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EXTI->RTSR &= ~(1 << channel);
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if (extp->config->channels[channel].mode & EXT_CH_MODE_FALLING_EDGE)
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EXTI->FTSR |= (1 << channel);
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else
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EXTI->FTSR &= ~(1 << channel);
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/* Programming interrupt and event registers.*/
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if (extp->config->channels[channel].cb != NULL) {
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EXTI->IMR |= (1 << channel);
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EXTI->EMR &= ~(1 << channel);
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}
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else {
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EXTI->EMR |= (1 << channel);
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EXTI->IMR &= ~(1 << channel);
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}
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#if STM32_EXTI_NUM_CHANNELS > 32
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}
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else {
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/* Programming edge registers.*/
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if (extp->config->channels[channel].mode & EXT_CH_MODE_RISING_EDGE)
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EXTI->RTSR2 |= (1 << (32 - channel));
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else
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EXTI->RTSR2 &= ~(1 << (32 - channel));
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if (extp->config->channels[channel].mode & EXT_CH_MODE_FALLING_EDGE)
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EXTI->FTSR2 |= (1 << (32 - channel));
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else
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EXTI->FTSR2 &= ~(1 << (32 - channel));
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/* Programming interrupt and event registers.*/
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if (extp->config->channels[channel].cb != NULL) {
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EXTI->IMR2 |= (1 << (32 - channel));
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EXTI->EMR2 &= ~(1 << (32 - channel));
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}
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else {
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EXTI->EMR2 |= (1 << (32 - channel));
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EXTI->IMR2 &= ~(1 << (32 - channel));
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}
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}
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#endif
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}
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/**
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* @brief Disables an EXT channel.
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*
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* @param[in] extp pointer to the @p EXTDriver object
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* @param[in] channel channel to be disabled
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*
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* @notapi
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*/
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void ext_lld_channel_disable(EXTDriver *extp, expchannel_t channel) {
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(void)extp;
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#if STM32_EXTI_NUM_CHANNELS > 32
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if (channel < 32) {
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#endif
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EXTI->IMR &= ~(1 << channel);
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EXTI->EMR &= ~(1 << channel);
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EXTI->RTSR &= ~(1 << channel);
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EXTI->FTSR &= ~(1 << channel);
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EXTI->PR = (1 << channel);
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#if STM32_EXTI_NUM_CHANNELS > 32
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}
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else {
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EXTI->IMR2 &= ~(1 << (32 - channel));
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EXTI->EMR2 &= ~(1 << (32 - channel));
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EXTI->RTSR2 &= ~(1 << (32 - channel));
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EXTI->FTSR2 &= ~(1 << (32 - channel));
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EXTI->PR2 = (1 << (32 - channel));
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}
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#endif
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}
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#endif /* HAL_USE_EXT */
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/** @} */
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