void TIM2_PWM_config (u32 arr) 
{
NVIC_InitTypeDef NVIC_InitStructure; 
GPIO_InitTypeDef GPIO_InitStructure; 
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure; 
TIM_OCInitTypeDef TIM_OCInitStructure; 

RCC_APB1PeriphClockCmd (RCC_APB1Periph_TIM2, ENABLE); 
RCC_AHB1PeriphClockCmd (RCC_AHB1Periph_GPIOA | RCC_AHB1Periph_GPIOB, ENABLE); 
GPIO_PinAFConfig (GPIOA, GPIO_PinSource15 GPIO_AF_TIM2); 
GPIO_PinAFConfig (GPIOB, GPIO_PinSource3 GPIO_AF_TIM2); 

GPIO_InitStructure. GPIO_Pin=GPIO_Pin_15; 
GPIO_InitStructure. GPIO_Mode=GPIO_Mode_AF; 
GPIO_InitStructure.GPIO_Speed=GPIO_Speed_100MHz; 
GPIO_InitStructure. GPIO_OType=GPIO_OType_PP; 
GPIO_InitStructure.GPIO_PuPd=GPIO_PuPd_UP; 
GPIO_Init (GPIOA, & amp; GPIO_InitStructure); 

GPIO_InitStructure.GPIO_Pin=GPIO_Pin_3; 
GPIO_Init (GPIOB, & amp; GPIO_InitStructure); 

TIM_ITConfig (TIM2, TIM_IT_Update, ENABLE); 

NVIC_InitStructure. NVIC_IRQChannel=TIM2_IRQn; 
NVIC_InitStructure. NVIC_IRQChannelPreemptionPriority=1; 
NVIC_InitStructure. NVIC_IRQChannelSubPriority=0; 
NVIC_InitStructure. NVIC_IRQChannelCmd=ENABLE; 
NVIC_Init (& amp; NVIC_InitStructure); 

TIM_TimeBaseStructure. TIM_Period=arr; 
TIM_TimeBaseStructure. TIM_Prescaler=0; 
TIM_TimeBaseStructure. TIM_ClockDivision=0; 
TIM_TimeBaseStructure. TIM_CounterMode=TIM_CounterMode_Up; 
TIM_TimeBaseInit (TIM2, & amp; TIM_TimeBaseStructure); 


TIM_OCInitStructure. TIM_OCMode=TIM_OCMode_PWM1; 
TIM_OCInitStructure. TIM_OutputState=TIM_OutputState_Enable; 
TIM_OCInitStructure. TIM_OCPolarity=TIM_OCPolarity_Low; 
TIM_OC1Init (TIM2, & amp; TIM_OCInitStructure); 
TIM_OC1PreloadConfig (TIM2, TIM_OCPreload_Enable); 
//TIM_ARRPreloadConfig (TIM2, ENABLE); 


TIM_OCInitStructure. TIM_OCMode=TIM_OCMode_PWM1; 
TIM_OCInitStructure. TIM_OutputState=TIM_OutputState_Enable; 
TIM_OCInitStructure. TIM_OCPolarity=TIM_OCPolarity_Low; 
TIM_OC2Init (TIM2, & amp; TIM_OCInitStructure); 
TIM_OC2PreloadConfig (TIM2, TIM_OCPreload_Enable); 

TIM2 - & gt; CCR1=arr/2; 
TIM2 - & gt; CCR2=arr/2; 

TIM_Cmd (TIM2, ENABLE); 
} 

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