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http://blog.sina.com.cn/s/blog_8240cbef01018dgc.html

2013
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定時(shí)器1的配置 輸出兩路PWM信號 PA8 PA11
計數時(shí)鐘為400KHZ 計數溢出大小為40000 /
void Tim1Init(void)
{ 
 GPIO_InitTypeDef GPIO_InitStruct;
 TIM_TimeBaseInitTypeDefTIM_TimeBaseInitStruct;
 TIM_OCInitTypeDef TIM_OCInitStruct;
      
 u16LeftMotor_CCR;  
 u16 RightMotor_CCR;
 
 RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM1
                    | RCC_APB2Periph_GPIOA
                    | RCC_APB2Periph_AFIO, ENABLE);
 
   
 GPIO_InitStruct.GPIO_Pin  = GPIO_Pin_8 | GPIO_Pin_11 ; // 定時(shí)器1通道1和4 
 GPIO_InitStruct.GPIO_Mode  =GPIO_Mode_AF_PP;
 GPIO_InitStruct.GPIO_Speed =GPIO_Speed_50MHz;
 GPIO_Init(GPIOA, &GPIO_InitStruct);
 
 
 LeftMotor_CCR = RightMotor_CCR = 2000;
 
  //在A(yíng)PB2設置為72MHZ的基礎上，對定時(shí)器1進(jìn)行配置 
 TIM_TimeBaseInitStruct.TIM_RepetitionCounter =0;            //重復計數器無(wú)效*/      
 TIM_TimeBaseInitStruct.TIM_CounterMode =TIM_CounterMode_Up; // 向上計數 */
 TIM_TimeBaseInitStruct.TIM_ClockDivision =TIM_CKD_DIV1;     //時(shí)鐘分頻 */
 TIM_TimeBaseInitStruct.TIM_Prescaler =180-1;               // 預分頻系數為180-1，計數器時(shí)鐘為72MHz/180 = 400KHz*/              
 TIM_TimeBaseInitStruct.TIM_Period =40000-1;                 //1)設置計數溢出大小，每計40000個(gè)數就產(chǎn)生一個(gè)更新事件,
                  2)捕獲比較器的值不能大于此值
                  3)計數器時(shí)鐘400KHZ，每個(gè)更新事件為100ms，即脈沖周期為0.1S
                  */ 
 TIM_TimeBaseInit(TIM1,&TIM_TimeBaseInitStruct);
 
 TIM_OCInitStruct.TIM_OutputNState =TIM_OutputNState_Disable;
 
 TIM_OCInitStruct.TIM_OCMode =TIM_OCMode_PWM2;
 TIM_OCInitStruct.TIM_OutputState = TIM_OutputState_Enable;
 TIM_OCInitStruct.TIM_OCPolarity  = TIM_OCPolarity_Low;

 
 TIM_OCInitStruct.TIM_Pulse =LeftMotor_CCR;  
 TIM_OC1Init(TIM1, &TIM_OCInitStruct);

 
 TIM_OCInitStruct.TIM_Pulse =RightMotor_CCR;
 TIM_OC4Init(TIM1, &TIM_OCInitStruct);

 TIM_Cmd(TIM1, ENABLE);
 TIM_CtrlPWMOutputs(TIM1, ENABLE);
 
}