這個是STM32的PWM輸出模式，STM32的TIM1模塊是增強型的定時器模塊，天生就是為電機控制而生，可以產生3組6路PWM，同時每組2路PWM為互補，并可以帶有死區，可以用來驅動H橋。
　　下面的代碼，是利用TIM1模塊的1、2通道產生一共4路PWM的代碼例子，類似代碼也可以參考ST的固件庫中相應example
C語言: TIM1模塊產生PWM，帶死區
    
//Step1.開啟TIM和相應端口時鐘
//啟動GPIO
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA | RCC_APB2Periph_GPIOB | \
                       RCC_APB2Periph_GPIOC | RCC_APB2Periph_GPIOD,\
                       ENABLE);
//啟動AFIO
RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO, ENABLE);
//啟動TIM1
RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM1, ENABLE);

//Step2. GPIO做相應設置，為AF輸出
//PA.8/9口設置為TIM1的OC1輸出口
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_8 | GPIO_Pin_9;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOA, &GPIO_InitStructure);

//PB.13/14口設置為TIM1_CH1N和TIM1_CH2N輸出口
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_13 | GPIO_Pin_14;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOB, &GPIO_InitStructure);

//Step3. TIM模塊初始化
void TIM_Configuration(void)
{
    TIM_TimeBaseInitTypeDef TIM_BaseInitStructure;
    TIM_OCInitTypeDef TIM_OCInitStructure;
    TIM_BDTRInitTypeDef TIM_BDTRInitStructure;

    //TIM1基本計數器設置（設置PWM頻率）
    //頻率=TIM1_CLK/(ARR+1)
    TIM_BaseInitStructure.TIM_Period = 1000-1;
    TIM_BaseInitStructure.TIM_Prescaler = 72-1;
    TIM_BaseInitStructure.TIM_ClockDivision = 0;
    TIM_BaseInitStructure.TIM_CounterMode = TIM_CounterMode_Up;
    TIM_BaseInitStructure.TIM_RepetitionCounter = 0;
    TIM_TimeBaseInit(TIM1, &TIM_BaseInitStructure);
    //啟用ARR的影子寄存器（直到產生更新事件才更改設置）
    TIM_ARRPreloadConfig(TIM1, ENABLE);


    //TIM1_OC1模塊設置（設置1通道占空比）
    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;
    TIM_OCInitStructure.TIM_OCNPolarity = TIM_OCNPolarity_High;
    TIM_OCInitStructure.TIM_Pulse = 120;
    TIM_OC1Init(TIM1, &TIM_OCInitStructure);
    //啟用CCR1寄存器的影子寄存器（直到產生更新事件才更改設置）
    TIM_OC1PreloadConfig(TIM1, TIM_OCPreload_Enable);

    //TIM2_OC2模塊設置（設置2通道占空比）
    TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
    TIM_OCInitStructure.TIM_OutputNState = TIM_OutputNState_Enable;
    TIM_OCInitStructure.TIM_Pulse = 680;
    TIM_OC2Init(TIM1, &TIM_OCInitStructure);
    //啟用CCR2寄存器的影子寄存器（直到產生更新事件才更改設置）
    TIM_OC2PreloadConfig(TIM1, TIM_OCPreload_Enable);
   
    //死區設置
    TIM_BDTRInitStructure.TIM_OSSRState = TIM_OSSRState_Enable;
    TIM_BDTRInitStructure.TIM_OSSIState = TIM_OSSIState_Enable;
    TIM_BDTRInitStructure.TIM_LOCKLevel = TIM_LOCKLevel_OFF;
    TIM_BDTRInitStructure.TIM_DeadTime = 0x90;  //這里調整死區大小0-0xff
    TIM_BDTRInitStructure.TIM_Break = TIM_Break_Disable;
    TIM_BDTRInitStructure.TIM_BreakPolarity = TIM_BreakPolarity_High;
    TIM_BDTRInitStructure.TIM_AutomaticOutput = TIM_AutomaticOutput_Enable;
    TIM_BDTRConfig(TIM1, &TIM_BDTRInitStructure);
   
    //TIM1開啟
    TIM_Cmd(TIM1, ENABLE);
    //TIM1_OC通道輸出PWM（一定要加）
    TIM_CtrlPWMOutputs(TIM1, ENABLE);

}