{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;//5kTIM_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1/2TIM_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);
}