本文介绍使用一个定时器使能另一个定时器。

旧瓶装新酒，就是门控模式加一个TRGO，如果看到这里你还没有明白，那就去看看我前面的文章

代码部分也是旧瓶装新酒

void Timer3_Config(void)
{
   
    TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
    TIM_OCInitTypeDef TIM_OCInitStructure;

    RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE);

    // 时基单元
    TIM_TimeBaseStructure.TIM_Period = 1000 - 1;
    TIM_TimeBaseStructure.TIM_Prescaler = 24 - 1; 
    TIM_TimeBaseStructure.TIM_ClockDivision = 0;
    TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
    TIM_TimeBaseInit(TIM3, &TIM_TimeBaseStructure);

    // 配置OC
    TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;
    TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
    TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;
    TIM_OCInitStructure.TIM_Pulse = 500; // 占空比为50%
    TIM_OC1Init(TIM3, &TIM_OCInitStructure);
    TIM_OC1PreloadConfig(TIM3, TIM_OCPreload_Enable);

    // 选择TRGO
    TIM_SelectOutputTrigger(TIM3, TIM_TRGOSource_OC1Ref);
}

void Timer4_Config(void)
{
    
    TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
    RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM4, ENABLE);

    // 时基单元
    TIM_TimeBaseStructure.TIM_Period = 1000 - 1; 
    TIM_TimeBaseStructure.TIM_Prescaler = 24 - 1;
    TIM_TimeBaseStructure.TIM_ClockDivision = 0;
    TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
    TIM_TimeBaseInit(TIM4, &TIM_TimeBaseStructure);

    // 配置触发源
    TIM_SelectInputTrigger(TIM4, TIM_TS_ITR2); // ITR2 表示 Timer3 触发

    // 设置门控模式
    TIM_SelectSlaveMode(TIM4, TIM_SlaveMode_Gated);
    TIM_SelectMasterSlaveMode(TIM4, TIM_MasterSlaveMode_Enable);
}