circuitpython/ports/stm/peripherals/exti.c

/*
 * 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);
        }
    }
}