2-way complementary PWM of stm32 timer 1

void TIM1_PWM_Ini(u16 arr,u16 psc)

{

    GPIO_InitTypeDef GPIO_InitStructure;

    TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;

    TIM_OCInitTypeDef  TIM_OCInitStructure;

    TIM_BDTRInitTypeDef TIM_BDTRInitStructure;

//Start the clock

    RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM1, ENABLE); //Enable timer 3 clock

    RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA|RCC_APB2Periph_GPIOB,ENABLE); //Enable GPIO and function clock

//RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO,ENABLE); //Pin remapping requires turning on this clock

// Initialize GPIO

    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_8|GPIO_Pin_9; //PWM output at PA8,9,10

    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP; //Multiplex push-pull output

    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;

    GPIO_Init(GPIOA,&GPIO_InitStructure);                               //初始化GPIO

    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_13|GPIO_Pin_14; //PWM output at PA7

    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP; //Multiplex push-pull output

    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;

    GPIO_Init(GPIOB,&GPIO_InitStructure); //Initialize GPIO

//Initialize timer TIM1

    TIM_TimeBaseStructure.TIM_Period = arr; //Set the automatic reload period value

    TIM_TimeBaseStructure.TIM_Prescaler =psc; //Set the prescaler value

    TIM_TimeBaseStructure.TIM_ClockDivision = 0; //Set clock division: TDTS = Tck_tim

    TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up; //TIM up counting mode

// TIM_TimeBaseStructure.TIM_RepetitionCounter=0; //Repetition register, used to automatically update the pwm duty cycle

    TIM_TimeBaseInit(TIM1, &TIM_TimeBaseStructure);                     

//pwm output configuration, TIM_OCInitStructure has seven configurations

    TIM_OCInitStructure.TIM_OCMode=TIM_OCMode_PWM2; //Set to pwm2 output mode

TIM_OCInitStructure.TIM_OCPolarity=TIM_OCPolarity_High;  

    //TIM_OCInitStructure.TIM_OCPolarity=TIM_OCPolarity_Low; //Set the output polarity //The effective level of the output polarity and complementary polarity is low

    TIM_OCInitStructure.TIM_OutputState=TIM_OutputState_Enable; //Enable the channel output //Comparison output enable

//The following parameters (except pulse) are only used by advanced timers, and do not need to be configured for general timers

  //  TIM_OCInitStructure.TIM_OCNPolarity=TIM_OCPolarity_Low;  

TIM_OCInitStructure.TIM_OCNPolarity=TIM_OCPolarity_High; //Set the complementary end output polarity //The effective level of the output polarity and complementary polarity is low

    TIM_OCInitStructure.TIM_OutputNState=TIM_OutputNState_Enable; //Enable complementary output

    TIM_OCInitStructure.TIM_OCIdleState=TIM_OCIdleState_Reset; //Output status after dead zone

    TIM_OCInitStructure.TIM_OCNIdleState=TIM_OCIdleState_Reset; //Complementary output status after dead zone

//Set the pulse value of channel 1 capture compare register - duty cycle is 50%

    TIM_OCInitStructure.TIM_Pulse=CCR1_Val;

    TIM_OC1Init(TIM1,&TIM_OCInitStructure); //Set channel 1

//Set the pulse value of channel 2 capture compare register - duty cycle is 25%

    TIM_OCInitStructure.TIM_Pulse=CCR2_Val;

    TIM_OC2Init(TIM1,&TIM_OCInitStructure);

//Set the pulse value of channel 3 capture compare register - duty cycle is 12.5%

    TIM_OCInitStructure.TIM_Pulse=CCR3_Val;

    TIM_OC3Init(TIM1,&TIM_OCInitStructure);

//Dead zone and brake function configuration, only available for advanced timers, general timers do not need to configure TIM_BDTRInitStructure, a total of seven configurations

        TIM_BDTRInitStructure.TIM_OSSRState=TIM_OSSRState_Disable; //Output selection in running mode //Enable "off state" in running mode

        TIM_BDTRInitStructure.TIM_OSSIState=TIM_OSSIState_Disable; //Output selection in idle mode //Enable "off state" in off mode

        TIM_BDTRInitStructure.TIM_LOCKLevel=TIM_LOCKLevel_OFF; //Lock setting //Lock off

        TIM_BDTRInitStructure.TIM_DeadTime=0x90; //Dead time setting

        TIM_BDTRInitStructure.TIM_Break=TIM_Break_Disable; //Enable the brake function

        TIM_BDTRInitStructure.TIM_BreakPolarity=TIM_BreakPolarity_High; //Brake input polarity//Brake input high level is valid    

        TIM_BDTRInitStructure.TIM_AutomaticOutput=TIM_AutomaticOutput_Enable; //Automatic output enable

        TIM_BDTRConfig(TIM1,&TIM_BDTRInitStructure);        

//Open the enable terminal

        TIM_OC1PreloadConfig(TIM1,TIM_OCPreload_Enable); //Enable TIMx preload register on CCR1?

        TIM_ARRPreloadConfig(TIM1,ENABLE); //Enable TIMx preload register on ARR?

        TIM_Cmd(TIM1,ENABLE); //Turn on TIM2?

//The following sentence is only for advanced timers, output pwm must be turned on?

        TIM_CtrlPWMOutputs(TIM1,ENABLE); //pwm output enable, be sure to turn it on

}