circuitpython/ports/stm/peripherals/exti.c

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/*
* This file is part of the Micro Python project, http://micropython.org/
*
* The MIT License (MIT)
*
* Copyright (c) 2021 Lucian Copeland for Adafruit Industries
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#include <stdbool.h>
#include "py/mpconfig.h"
#include "py/gc.h"
#include "py/obj.h"
#include "py/runtime.h"
#include "peripherals/exti.h"
STATIC bool stm_exti_reserved[STM32_GPIO_PORT_SIZE];
STATIC void (*stm_exti_callback[STM32_GPIO_PORT_SIZE])(uint8_t num);
void exti_reset(void) {
for (size_t i = 0;i < STM32_GPIO_PORT_SIZE; i++) {
stm_exti_reserved[i] = false;
stm_exti_callback[i] = NULL;
stm_peripherals_exti_disable(i);
}
}
bool stm_peripherals_exti_is_free(uint8_t num) {
return !stm_exti_reserved[num];
}
bool stm_peripherals_exti_reserve(uint8_t num) {
if (!stm_peripherals_exti_is_free(num)) {
return false;
}
stm_exti_reserved[num] = true;
return true;
}
void stm_peripherals_exti_enable(uint8_t num) {
HAL_NVIC_EnableIRQ(stm_peripherals_exti_get_irq(num));
}
void stm_peripherals_exti_disable(uint8_t num) {
HAL_NVIC_DisableIRQ(stm_peripherals_exti_get_irq(num));
}
void stm_peripherals_exti_set_callback(void(*callback)(uint8_t num), uint8_t number) {
stm_exti_callback[number] = callback;
}
void stm_peripherals_exti_free(uint8_t num) {
stm_exti_reserved[num] = true;
}
IRQn_Type stm_peripherals_exti_get_irq(uint8_t num) {
if (num == 0) {
return EXTI0_IRQn;
} else if (num == 1) {
return EXTI1_IRQn;
} else if (num == 2) {
return EXTI2_IRQn;
} else if (num == 3) {
return EXTI3_IRQn;
} else if (num == 4) {
return EXTI4_IRQn;
} else if (num >= 5 && num <= 9 ) {
return EXTI9_5_IRQn;
} else if (num >= 10 && num <= 15) {
return EXTI15_10_IRQn;
} else {
return 0;
}
}
void EXTI0_IRQHandler(void)
{
stm_exti_callback[0](0);
}
void EXTI1_IRQHandler(void)
{
stm_exti_callback[1](1);
}
void EXTI2_IRQHandler(void)
{
stm_exti_callback[2](2);
}
void EXTI3_IRQHandler(void)
{
stm_exti_callback[3](3);
}
void EXTI4_IRQHandler(void)
{
stm_exti_callback[4](4);
}
void EXTI9_5_IRQHandler(void)
{
uint32_t pending = EXTI->PR;
for (uint i = 5; i <= 9; i++) {
if(pending & (1 << i)) {
stm_exti_callback[i](i);
}
}
}
void EXTI15_10_IRQHandler(void)
{
uint32_t pending = EXTI->PR;
for (uint i = 10; i <= 15; i++) {
if(pending & (1 << i)) {
stm_exti_callback[i](i);
}
}
}