1.概述
使用STM32主定时器+从定时器实现产生可控数量的PWM脉冲
2.创建工程
new progect
CubeMX Setting
RCC->Crystal
SYS->Serial Wire
Clock Configuration->168
TIM4
TIM2
Save
3.Code
main.c
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67/* USER CODE BEGIN 0 */
void generate_pulse(uint32_t value)
{
if(!value)
return;
__HAL_TIM_SET_AUTORELOAD(&htim2,value-1); //设置要输出的PWM脉冲
HAL_TIM_Base_Start_IT(&htim2); //启动从定时器
__HAL_TIM_SET_COUNTER(&htim4, 0);
HAL_TIM_PWM_Start(&htim4, TIM_CHANNEL_2); //启动主定时器PWM输出
}
void HAL_TIM_PeriodElapsedCallback(TIM_HandleTypeDef *htim)
{
if(htim == &htim2)
{
if(__HAL_TIM_GET_FLAG(&htim2, TIM_FLAG_CC2) != RESET) //判断是否触发中断
{
__HAL_TIM_CLEAR_FLAG(&htim2, TIM_FLAG_CC2); //清除中断标志
HAL_TIM_PWM_Stop(&htim4, TIM_CHANNEL_2); //关闭主定时器
HAL_TIM_Base_Stop_IT(&htim2); //关闭从定时器
}
}
}
/* USER CODE END 0 */
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_TIM2_Init();
MX_TIM4_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 */
generate_pulse(10);
HAL_Delay(1000);
}
/* USER CODE END 3 */
}4.Test
