stm32输出精确pwm脉冲数

// 示例：使用TIM1输出10个PWM脉冲
void PWM_Init(void) {
    TIM_HandleTypeDef htim1;
    htim1.Instance = TIM1;
    htim1.Init.Prescaler = 71;          // 预分频，72MHz/(71+1)=1MHz
    htim1.Init.Period = 999;            // 自动重载值，1MHz/(999+1)=1kHz频率
    htim1.Init.RepetitionCounter = 9;   // 重复计数器=9 → 输出10个脉冲
    htim1.Init.CounterMode = TIM_COUNTERMODE_UP;
    HAL_TIM_PWM_Init(&htim1);

    TIM_OC_InitTypeDef sConfigOC;
    sConfigOC.OCMode = TIM_OCMODE_PWM1;
    sConfigOC.Pulse = 500;              // 占空比50% (500/1000)
    sConfigOC.OCPolarity = TIM_OCPOLARITY_HIGH;
    HAL_TIM_PWM_ConfigChannel(&htim1, &sConfigOC, TIM_CHANNEL_1);

    HAL_TIM_PWM_Start(&htim1, TIM_CHANNEL_1);
    __HAL_TIM_ENABLE(&htim1);          // 启动定时器
}

// 全局变量
volatile uint32_t pulse_count = 0;
uint32_t target_pulses = 10;

void PWM_Init(void) {
    TIM_HandleTypeDef htim2;
    htim2.Instance = TIM2;
    htim2.Init.Prescaler = 71;         // 72MHz/(71+1)=1MHz
    htim2.Init.Period = 999;           // 1kHz频率
    htim2.Init.CounterMode = TIM_COUNTERMODE_UP;
    HAL_TIM_PWM_Init(&htim2);

    TIM_OC_InitTypeDef sConfigOC;
    sConfigOC.OCMode = TIM_OCMODE_PWM1;
    sConfigOC.Pulse = 500;             // 占空比50%
    sConfigOC.OCPolarity = TIM_OCPOLARITY_HIGH;
    HAL_TIM_PWM_ConfigChannel(&htim2, &sConfigOC, TIM_CHANNEL_1);

    HAL_TIM_PWM_Start_IT(&htim2, TIM_CHANNEL_1); // 启用PWM和中断
    __HAL_TIM_ENABLE_IT(&htim2, TIM_IT_UPDATE);  // 允许更新中断
}

// 定时器更新中断处理函数
void HAL_TIM_PeriodElapsedCallback(TIM_HandleTypeDef *htim) {
    if (htim->Instance == TIM2) {
        pulse_count++;
        if (pulse_count >= target_pulses) {
            HAL_TIM_PWM_Stop_IT(htim, TIM_CHANNEL_1); // 关闭PWM输出
            __HAL_TIM_DISABLE(htim);                 // 停止定时器
        }
    }
}

加载更多