stm32f103 timer1产生400HzPWM

/*timer1时钟为72MHz，产生400Hz，占空比为60%的PWM*/
void Bsp_Motor_PWM_Init(void)
{
    TIM_TimeBaseInitTypeDef TIM_TimeBaseInitStruct;
    TIM_OCInitTypeDef       TIM_OCInitStruct;
    GPIO_InitTypeDef GPIO_InitStruct;

    RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM1 | RCC_APB2Periph_GPIOA, ENABLE);

    GPIO_InitStruct.GPIO_Pin = GPIO_Pin_8;
    GPIO_InitStruct.GPIO_Mode = GPIO_Mode_AF_PP;
    GPIO_InitStruct.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_Init(GPIOA, &GPIO_InitStruct);

    TIM_TimeBaseInitStruct.TIM_Period = 59999; /*400Hz(2.5ms) */
    TIM_TimeBaseInitStruct.TIM_Prescaler = 2;
    TIM_TimeBaseInitStruct.TIM_ClockDivision = 0;
    TIM_TimeBaseInitStruct.TIM_CounterMode = TIM_CounterMode_Up;
    TIM_TimeBaseInit(TIM1, &TIM_TimeBaseInitStruct);

    TIM_OCStructInit(&TIM_OCInitStruct);/*这一步最好加上*/
    
    TIM_OCInitStruct.TIM_OCMode = TIM_OCMode_PWM1;
    TIM_OCInitStruct.TIM_OutputState = TIM_OutputState_Enable;
    TIM_OCInitStruct.TIM_Pulse = 36000;
    TIM_OCInitStruct.TIM_OCPolarity = TIM_OCPolarity_High;
    TIM_OC1Init(TIM1, &TIM_OCInitStruct);

    TIM_OC1PreloadConfig(TIM1, TIM_OCPreload_Enable);
    TIM_ARRPreloadConfig(TIM1, ENABLE);
    TIM_CtrlPWMOutputs(TIM1, ENABLE);/*这一个函数只针对timer1和timer8*/
    TIM_Cmd(TIM1, ENABLE);      

}