stm32f0 pwm初始化设置

{
    GPIO_InitTypeDef GPIO_InitStructure;
    TIM_OCInitTypeDef  TIM_OCInitStructure;
    TIM_TimeBaseInitTypeDef TIM_TimeBaseInitStruct;
    
    RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOA, ENABLE);//使能时钟
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM1, ENABLE);
    
    /* GPIOA Configuration: Channel 1, 2, 3 and 4 as alternate function push-pull */
    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_8 | GPIO_Pin_11;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;//复用模式
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
    GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_DOWN;
    GPIO_Init(GPIOA, &GPIO_InitStructure);
    
    GPIO_PinAFConfig(GPIOA, GPIO_PinSource8, GPIO_AF_2);//开启复用
    GPIO_PinAFConfig(GPIOA, GPIO_PinSource11, GPIO_AF_2);
    
    TIM_TimeBaseInitStruct.TIM_Prescaler = 0;//5k
    TIM_TimeBaseInitStruct.TIM_ClockDivision = 0;
    TIM_TimeBaseInitStruct.TIM_CounterMode = TIM_CounterMode_Up;
    TIM_TimeBaseInitStruct.TIM_Period = MOTOR_COUNT;//这里设置的是5k的频率，value =(48000000/你想要的频率)-1 
    TIM_TimeBaseInitStruct.TIM_RepetitionCounter = 0;
    
    TIM_TimeBaseInit(TIM1,&TIM_TimeBaseInitStruct);
    
    /* 频道1，2，3，4的PWM 模式设置 */
    TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;
    TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
    TIM_OCInitStructure.TIM_OutputNState = TIM_OutputNState_Enable;
    TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;//输出极性
    TIM_OCInitStructure.TIM_OCNPolarity = TIM_OCNPolarity_Low;//输出极性
    TIM_OCInitStructure.TIM_OCIdleState = TIM_OCIdleState_Set;
    TIM_OCInitStructure.TIM_OCNIdleState = TIM_OCIdleState_Reset;
    
    TIM_OCInitStructure.TIM_Pulse = (MOTOR_COUNT>>1);//使能频道1配置
    TIM_OC1Init(TIM1, &TIM_OCInitStructure);
    
    TIM_OCInitStructure.TIM_Pulse = (MOTOR_COUNT>>1);//使能频道1配置
    TIM_OC4Init(TIM1, &TIM_OCInitStructure);    
    //值为0~MOTOR_COUNT，这里MOTOR_COUNT的值已经减一了
    TIM_SetCompare1(TIM1,(MOTOR_COUNT>>1));//输出波形的1/2
    TIM_SetCompare4(TIM1,(MOTOR_COUNT>>1));//输出波形的1/2
    /* TIM1 计算器使能*/
    TIM_Cmd(TIM1, ENABLE);
    /* TIM1 主输出使能 */
    TIM_CtrlPWMOutputs(TIM1, ENABLE);
}