//main.c

GPIO_InitStruct.Pin = GPIO_PIN_11;

GPIO_InitStruct.Mode = GPIO_MODE_IT_FALLING;//PA11下降沿触发中断

GPIO_InitStruct.Pull = GPIO_PULLUP;

GPIO_InitStruct.Speed = GPIO_SPEED_LOW;

HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);

GPIO_InitStruct.Pin = GPIO_PIN_12;

GPIO_InitStruct.Mode = GPIO_MODE_IT_FALLING; //PA12下降沿触发中断

GPIO_InitStruct.Pull = GPIO_PULLUP;

GPIO_InitStruct.Speed = GPIO_SPEED_LOW;

HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);

HAL_NVIC_SetPriority(EXTI15_10_IRQn,0,0);//设置中断优先级，enable中断向量表

HAL_NVIC_EnableIRQ(EXTI15_10_IRQn);

void EXTI15_10_IRQHandler(void){

if(HAL_GPIO_ReadPin(GPIOA, GPIO_PIN_11)!=0){

HAL_GPIO_EXTI_IRQHandler(GPIO_PIN_11);

}

if(HAL_GPIO_ReadPin(GPIOA, GPIO_PIN_12)!=0){

HAL_GPIO_EXTI_IRQHandler(GPIO_PIN_12);

}

}

void HAL_GPIO_EXTI_Callback(uint16_t GPIO_Pin){

switch(GPIO_Pin){

caseGPIO_PIN_11:

printf("Pressed\r\n");

mode=!mode;     //更改模式

break;

caseGPIO_PIN_12:     //增加一圈距离

counter++;

break;

}

}

void MX_TIM3_Init(void)

{

TIM_ClockConfigTypeDef sClockSourceConfig;

TIM_MasterConfigTypeDef sMasterConfig;

TIM_Handler.Instance = TIM3;

TIM_Handler.Init.Prescaler = 48000;

TIM_Handler.Init.CounterMode = TIM_COUNTERMODE_UP;

TIM_Handler.Init.Period = 199;         //200ms

TIM_Handler.Init.ClockDivision = TIM_CLOCKDIVISION_DIV1;

HAL_TIM_Base_Init(&TIM_Handler);

sClockSourceConfig.ClockSource = TIM_CLOCKSOURCE_INTERNAL;

HAL_TIM_ConfigClockSource(&TIM_Handler, &sClockSourceConfig);

sMasterConfig.MasterOutputTrigger = TIM_TRGO_RESET;

sMasterConfig.MasterSlaveMode = TIM_MASTERSLAVEMODE_DISABLE;

HAL_TIMEx_MasterConfigSynchronization(&TIM_Handler,&sMasterConfig);

}

//stm32f1xx_it.c

void TIM3_IRQHandler(void)

{

HAL_TIM_IRQHandler(&TIM_Handler);

}

//main.c

void HAL_TIM_PeriodElapsedCallback(TIM_HandleTypeDef*htim){

if(htim->Instance == TIM3){

timer_flag= 1;       //设置flag

timer_counter++;

}