void TIM1_PWM_Init(u16 arr,u16 psc)

{  

GPIO_InitTypeDef GPIO_InitStructure;

TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;

TIM_OCInitTypeDef  TIM_OCInitStructure;

RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM1, ENABLE);// 

  RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOE , ENABLE);  

RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO, ENABLE);                                                                   

    GPIO_PinRemapConfig(GPIO_FullRemap_TIM1,ENABLE);                                                                    

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_14; //TIM1_CH3

GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;  

GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;

GPIO_Init(GPIOE, &GPIO_InitStructure);

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_15; //TIM1_CH4

GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;  

GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;

GPIO_Init(GPIOE, &GPIO_InitStructure);

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_11; //TIM1_CH2

GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP; 

GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;

GPIO_Init(GPIOE, &GPIO_InitStructure);

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9; 

GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;  

GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;

GPIO_Init(GPIOE, &GPIO_InitStructure);

    GPIO_ResetBits(GPIOE,GPIO_Pin_9);

TIM_TimeBaseStructure.TIM_Period = arr; 

TIM_TimeBaseStructure.TIM_Prescaler =psc;  

TIM_TimeBaseStructure.TIM_ClockDivision = 0; 

TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;  

TIM_TimeBaseInit(TIM1, &TIM_TimeBaseStructure); 

TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1; 

TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable; 

TIM_OCInitStructure.TIM_Pulse = 0; 

TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;

TIM_OC1Init(TIM1, &TIM_OCInitStructure);  

TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1; 

TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable; 

TIM_OCInitStructure.TIM_Pulse = 0; 

TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High; 

TIM_OC2Init(TIM1, &TIM_OCInitStructure);  

TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1; 

TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable; 

TIM_OCInitStructure.TIM_Pulse = 0; 

TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High; 

TIM_OC3Init(TIM1, &TIM_OCInitStructure);  

TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1; 

TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable; 

TIM_OCInitStructure.TIM_Pulse = 0; 

TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High; 

TIM_OC4Init(TIM1, &TIM_OCInitStructure);  

    TIM_CtrlPWMOutputs(TIM1,ENABLE);

TIM_OC1PreloadConfig(TIM1, TIM_OCPreload_Enable);   

TIM_OC2PreloadConfig(TIM1, TIM_OCPreload_Enable);  

TIM_OC3PreloadConfig(TIM1, TIM_OCPreload_Enable);  // 

TIM_OC4PreloadConfig(TIM1, TIM_OCPreload_Enable);  //  

TIM_ARRPreloadConfig(TIM1, ENABLE); //

TIM_Cmd(TIM1, ENABLE);  //

}