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void MX_GPIO_Init(void)
{GPIO_InitTypeDef GPIO_InitStruct = {0};/* GPIO Ports Clock Enable */__HAL_RCC_GPIOC_CLK_ENABLE();__HAL_RCC_GPIOD_CLK_ENABLE();__HAL_RCC_GPIOA_CLK_ENABLE();/*Configure GPIO pin Output Level */HAL_GPIO_WritePin(LED_GPIO_Port, LED_Pin, GPIO_PIN_SET);/*Configure GPIO pin : PtPin */GPIO_InitStruct.Pin = LED_Pin;GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;GPIO_InitStruct.Pull = GPIO_NOPULL;GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;HAL_GPIO_Init(LED_GPIO_Port, &GPIO_InitStruct);/*Configure GPIO pin : PtPin */GPIO_InitStruct.Pin = SW1_Pin;GPIO_InitStruct.Mode = GPIO_MODE_IT_RISING;GPIO_InitStruct.Pull = GPIO_PULLDOWN;HAL_GPIO_Init(SW1_GPIO_Port, &GPIO_InitStruct);/* EXTI interrupt init*/HAL_NVIC_SetPriority(EXTI1_IRQn, 0, 0);HAL_NVIC_EnableIRQ(EXTI1_IRQn);}/* USER CODE BEGIN 2 */
void HAL_GPIO_EXTI_Callback(uint16_t GPIO_Pin){if(GPIO_Pin==SW1_Pin){ if(HAL_GPIO_ReadPin(SW1_GPIO_Port,SW1_Pin)==GPIO_PIN_SET){		  uint16_t mycount=0x7Fff;while(mycount--){				 if(HAL_GPIO_ReadPin(SW1_GPIO_Port,SW1_Pin)==GPIO_PIN_RESET){	return;}				 }	swstate=!swstate;}}	    
}

int main(void)
{/* USER CODE BEGIN 1 *//* USER CODE END 1 *//* MCU Configuration--------------------------------------------------------*//* Reset of all peripherals, Initializes the Flash interface and the Systick. */HAL_Init();/* USER CODE BEGIN Init *//* USER CODE END Init *//* Configure the system clock */SystemClock_Config();/* USER CODE BEGIN SysInit *//* USER CODE END SysInit *//* Initialize all configured peripherals */MX_GPIO_Init();MX_USART1_UART_Init();/* USER CODE BEGIN 2 *//* USER CODE END 2 *//* Infinite loop *//* USER CODE BEGIN WHILE */while (1){/* USER CODE END WHILE *//* USER CODE BEGIN 3 */if(swstate){HAL_GPIO_WritePin(LED_GPIO_Port,LED_Pin,GPIO_PIN_RESET);}else{HAL_GPIO_WritePin(LED_GPIO_Port,LED_Pin,GPIO_PIN_SET);	}}

1、外部中断引脚不能为浮空，否则极易受到环境干扰

        GPIO_InitStruct.Pull = GPIO_PULLDOWN;

2、中断服务程序最好不要用 HAL_delay（）延时，它也要使用中断。