[STM32H7] 高效驱动！基于STM32H743的GPIO中断与DMA传输示例

#include "stm32h7xx_hal.h"

#include "main.h"



UART_HandleTypeDef huart3; // 使用USART3

DMA_HandleTypeDef hdma_usart3_tx;

volatile uint8_t dmaBuffer[] = "Button Pressed!\r\n";



void SystemClock_Config(void);

static void MX_GPIO_Init(void);

static void MX_USART3_UART_Init(void);

static void MX_DMA_Init(void);



int main(void) {

    HAL_Init();

    SystemClock_Config();

    MX_GPIO_Init();

    MX_DMA_Init();

    MX_USART3_UART_Init();



    while (1) {

        HAL_GPIO_TogglePin(GPIOB, GPIO_PIN_0); // 闪烁LED

        HAL_Delay(500);

    }

}



void HAL_GPIO_EXTI_Callback(uint16_t GPIO_Pin) {

    if (GPIO_Pin == GPIO_PIN_13) { // 检测按键中断

        HAL_UART_Transmit_DMA(&huart3, dmaBuffer, sizeof(dmaBuffer) - 1); 

    }

}



static void MX_GPIO_Init(void) {

    GPIO_InitTypeDef GPIO_InitStruct = {0};



    __HAL_RCC_GPIOC_CLK_ENABLE();

    __HAL_RCC_GPIOB_CLK_ENABLE();



    // 配置按键输入

    GPIO_InitStruct.Pin = GPIO_PIN_13;

    GPIO_InitStruct.Mode = GPIO_MODE_IT_FALLING;

    GPIO_InitStruct.Pull = GPIO_NOPULL;

    HAL_GPIO_Init(GPIOC, &GPIO_InitStruct);



    // 配置LED输出

    GPIO_InitStruct.Pin = GPIO_PIN_0;

    GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;

    GPIO_InitStruct.Pull = GPIO_NOPULL;

    GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;

    HAL_GPIO_Init(GPIOB, &GPIO_InitStruct);



    HAL_NVIC_SetPriority(EXTI15_10_IRQn, 0, 0);

    HAL_NVIC_EnableIRQ(EXTI15_10_IRQn);

}



static void MX_USART3_UART_Init(void) {

    huart3.Instance = USART3;

    huart3.Init.BaudRate = 115200;

    huart3.Init.WordLength = UART_WORDLENGTH_8B;

    huart3.Init.StopBits = UART_STOPBITS_1;

    huart3.Init.Parity = UART_PARITY_NONE;

    huart3.Init.Mode = UART_MODE_TX_RX;

    huart3.Init.HwFlowCtl = UART_HWCONTROL_NONE;

    huart3.Init.OverSampling = UART_OVERSAMPLING_16;

    huart3.Init.OneBitSampling = UART_ONE_BIT_SAMPLE_DISABLE;

    huart3.AdvancedInit.AdvFeatureInit = UART_ADVFEATURE_NO_INIT;

    if (HAL_UART_Init(&huart3) != HAL_OK) {

        Error_Handler();

    }

}



static void MX_DMA_Init(void) {

    __HAL_RCC_DMA1_CLK_ENABLE();



    hdma_usart3_tx.Instance = DMA1_Stream3;

    hdma_usart3_tx.Init.Request = DMA_REQUEST_USART3_TX;

    hdma_usart3_tx.Init.Direction = DMA_MEMORY_TO_PERIPH;

    hdma_usart3_tx.Init.PeriphInc = DMA_PINC_DISABLE;

    hdma_usart3_tx.Init.MemInc = DMA_MINC_ENABLE;

    hdma_usart3_tx.Init.PeriphDataAlignment = DMA_PDATAALIGN_BYTE;

    hdma_usart3_tx.Init.MemDataAlignment = DMA_MDATAALIGN_BYTE;

    hdma_usart3_tx.Init.Mode = DMA_NORMAL;

    hdma_usart3_tx.Init.Priority = DMA_PRIORITY_LOW;

    if (HAL_DMA_Init(&hdma_usart3_tx) != HAL_OK) {

        Error_Handler();

    }



    __HAL_LINKDMA(&huart3, hdmatx, hdma_usart3_tx);

}



void Error_Handler(void) {

    while (1) {

        // 错误处理

    }

}