/* 配置TIM1复用输出PWM时用到的I/O  */

 static void TIM1_GPIO_Config(void)

 {

   GPIO_InitTypeDef GPIO_InitStructure;

   /* TIM1 clock enable */

   RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM1, ENABLE);

   /* GPIOA and GPIOB clock enable */

   RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA | RCC_APB2Periph_GPIOB, ENABLE);

   GPIO_InitStructure.GPIO_Pin =  GPIO_Pin_9 | GPIO_Pin_10;

   GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;

   GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;

   GPIO_Init(GPIOA, &GPIO_InitStructure);

   GPIO_InitStructure.GPIO_Pin =  GPIO_Pin_14 | GPIO_Pin_15;

   GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;

   GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;

   GPIO_Init(GPIOB, &GPIO_InitStructure);

 }

初始化IO

 u16 CCR2_Val = ;

 u16 CCR3_Val = ;//占空比，周期为1000

 /*配置TIM1输出的PWM信号的模式，如周期、极性、占空比 */

 void TIM1_Mode_Config(void)

 {

     TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;

     TIM_BDTRInitTypeDef      TIM1_BDTRInitStruct;

     TIM_OCInitTypeDef        TIM_OCInitStructure;

     /* Time base configuration */

     TIM_TimeBaseStructure.TIM_Period = -; //计数周期，向上记到此数，计数值清零

     TIM_TimeBaseStructure.TIM_Prescaler = -;//定时器分频系数，Ftimer = 72M/(TIM_Prescaler+1) = 1ms

     TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1;//与死区时间分频有关

     TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;//向上计数模式

     TIM_TimeBaseInit(TIM1, &TIM_TimeBaseStructure);

     /****** 配置BDTR寄存器，配置死区时间****************/

     /*

        定时器时钟 72M   TIM_ClockDivision = TIM_CKD_DIV1时,  Tdts = 13.89ns

        0 - 1.764us  用算法一

        1.778us - 3.505us  用算法二

        3.556us - 7.000us  用算法三

        7.1117us - 14us    用算法四

        需要更长时间,使用TIM_ClockDivision分频

     */

     TIM1_BDTRInitStruct.TIM_OSSRState = TIM_OSSRState_Disable;

     TIM1_BDTRInitStruct.TIM_OSSIState = TIM_OSSIState_Disable;

     TIM1_BDTRInitStruct.TIM_LOCKLevel = TIM_LOCKLevel_OFF;

     TIM1_BDTRInitStruct.TIM_DeadTime = ; //死区时间  72:1us 172:3us 205:5us

     TIM_BDTRConfig(TIM1,&TIM1_BDTRInitStruct);

 //    TIM1->BDTR |= 72;   //设置死区  注:上面那种方法也可以，这种快且简单

      /* PWM1 Mode configuration: Channel2 */

      TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM2;//PWM2模式

      TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable; //比较输出使能

      TIM_OCInitStructure.TIM_OutputNState = TIM_OutputNState_Enable;//比较互补输出使能

      TIM_OCInitStructure.TIM_Pulse = CCR2_Val;   //比较值，即占空比

      TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;  //输出极性

      TIM_OCInitStructure.TIM_OCNPolarity = TIM_OCNPolarity_High;//互补输出极性

      TIM_OCInitStructure.TIM_OCIdleState = TIM_OCIdleState_Reset;//指定空闲状态下的TIM输出比较的引脚状态。

      TIM_OCInitStructure.TIM_OCNIdleState = TIM_OCIdleState_Reset;//指定空闲状态下的TIM互补输出比较的引脚状态。

      TIM_OC2Init(TIM1, &TIM_OCInitStructure);   //初始化通道二比较输出

      TIM_OC2PreloadConfig(TIM1, TIM_OCPreload_Enable);      //配置通道二，自动重装载使能

     /* PWM1 Mode configuration: Channel3 */

     TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM2;

     TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;

     TIM_OCInitStructure.TIM_OutputNState = TIM_OutputNState_Enable;

     TIM_OCInitStructure.TIM_Pulse = CCR3_Val;

     TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;

     TIM_OCInitStructure.TIM_OCNPolarity = TIM_OCNPolarity_High;

     TIM_OCInitStructure.TIM_OCIdleState = TIM_OCIdleState_Reset;

     TIM_OCInitStructure.TIM_OCNIdleState = TIM_OCIdleState_Reset;

     TIM_OC3Init(TIM1, &TIM_OCInitStructure);

     TIM_OC3PreloadConfig(TIM1, TIM_OCPreload_Enable);    

     TIM_ARRPreloadConfig(TIM1, ENABLE);//重载装载值 ENABLE 立即生效，DISABLE 下一个比较周期生效

     /* TIM1 enable counter */

     TIM_Cmd(TIM1, ENABLE);//使能定时器1

     TIM_CtrlPWMOutputs(TIM1, ENABLE);//使能PWM外围输出

 }

 int main(void)

 {

     TIM1_GPIO_Config();

     TIM1_Mode_Config();

     while()

     {

          TIM1->CCR2 = CCR2_Val;

          TIM1->CCR3 = CCR3_Val;

          CCR2_Val+=;

          CCR3_Val+=;

          if(CCR2_Val>)  CCR2_Val = ;

          if(CCR3_Val>)  CCR3_Val = ;

          Delay_mS();

     }

 }

main函数