外部中斷按鍵控制LED燈

在main.c中 HAL_Init(); 初始化Flash，中斷優先級以及HAL_MspInit函數，也就是?stm32f1xx_hal.c?中

HAL_StatusTypeDef HAL_Init(void)
{/* Configure Flash prefetch */
#if (PREFETCH_ENABLE != 0)
#if defined(STM32F101x6) || defined(STM32F101xB) || defined(STM32F101xE) || defined(STM32F101xG) || \defined(STM32F102x6) || defined(STM32F102xB) || \defined(STM32F103x6) || defined(STM32F103xB) || defined(STM32F103xE) || defined(STM32F103xG) || \defined(STM32F105xC) || defined(STM32F107xC)/* Prefetch buffer is not available on value line devices */__HAL_FLASH_PREFETCH_BUFFER_ENABLE();
#endif
#endif /* PREFETCH_ENABLE *//* Set Interrupt Group Priority */HAL_NVIC_SetPriorityGrouping(NVIC_PRIORITYGROUP_4);/* Use systick as time base source and configure 1ms tick (default clock after Reset is HSI) */HAL_InitTick(TICK_INT_PRIORITY);/* Init the low level hardware */HAL_MspInit();/* Return function status */return HAL_OK;
}

在main.c 的MX_GPIO_Init();，初始化GPIO時鐘模式速度等，也就是?gpio.c?中

void MX_GPIO_Init(void)
{GPIO_InitTypeDef GPIO_InitStruct = {0};/* GPIO Ports Clock Enable */__HAL_RCC_GPIOE_CLK_ENABLE();__HAL_RCC_GPIOC_CLK_ENABLE();__HAL_RCC_GPIOA_CLK_ENABLE();__HAL_RCC_GPIOB_CLK_ENABLE();/*Configure GPIO pin Output Level */HAL_GPIO_WritePin(GPIOE, GPIO_PIN_5, GPIO_PIN_SET);/*Configure GPIO pin Output Level */HAL_GPIO_WritePin(GPIOB, GPIO_PIN_5, GPIO_PIN_SET);/*Configure GPIO pin : PE4 */GPIO_InitStruct.Pin = GPIO_PIN_4;GPIO_InitStruct.Mode = GPIO_MODE_IT_FALLING;GPIO_InitStruct.Pull = GPIO_PULLUP;HAL_GPIO_Init(GPIOE, &GPIO_InitStruct);/*Configure GPIO pin : PE5 */GPIO_InitStruct.Pin = GPIO_PIN_5;GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;GPIO_InitStruct.Pull = GPIO_NOPULL;GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;HAL_GPIO_Init(GPIOE, &GPIO_InitStruct);/*Configure GPIO pin : PB5 */GPIO_InitStruct.Pin = GPIO_PIN_5;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);/* EXTI interrupt init*/HAL_NVIC_SetPriority(EXTI4_IRQn, 5, 0);HAL_NVIC_EnableIRQ(EXTI4_IRQn);}

在?stm32f1xx_it.c?中 中斷和異常處理程序

void EXTI4_IRQHandler(void)
{/* USER CODE BEGIN EXTI4_IRQn 0 *//* USER CODE END EXTI4_IRQn 0 */HAL_GPIO_EXTI_IRQHandler(GPIO_PIN_4);/* USER CODE BEGIN EXTI4_IRQn 1 *//* USER CODE END EXTI4_IRQn 1 */
}

key.c，邏輯業務代碼

#include "stm32f1xx_hal.h"
#include "led.h"void HAL_GPIO_EXTI_Callback(uint16_t GPIO_Pin)
{if (GPIO_Pin == GPIO_PIN_4) {// 去抖動處理HAL_Delay(10); // 簡單延時去抖動if (HAL_GPIO_ReadPin(GPIOE, GPIO_PIN_4) == GPIO_PIN_RESET) {led_toggle(); // 按鍵按下}}
}

LED請看GPIO示例代碼那節