本菜鸡想用stm32103的板子控制两路舵机，就干脆直接在pwm程序上改了。我查了一下TIM3通道2的复用口的PB5，我就加一个通道1的复用口的PB4。

图片说明

但结果是原来的PB5口好用得很，但新加的PB4口毛用没有。求大神帮我解答，万分感谢！

void TIM3_PWM_Init(u16 arr,u16 psc)
{  
    //定义变量
    GPIO_InitTypeDef GPIO_InitStructure;
    TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;
    TIM_OCInitTypeDef  TIM_OCInitStructure;
    //IO口配置
    RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE);    
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB  | RCC_APB2Periph_AFIO, ENABLE);  

    GPIO_PinRemapConfig(GPIO_PartialRemap_TIM3, ENABLE); 
    //使能PA4、PA5
    GPIO_InitStructure.GPIO_Pin =GPIO_Pin_4|GPIO_Pin_5; 
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP; 
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_Init(GPIOB, &GPIO_InitStructure);

    //定时器通用配置
    TIM_TimeBaseStructure.TIM_Period = arr; 
    TIM_TimeBaseStructure.TIM_Prescaler =psc;
    TIM_TimeBaseStructure.TIM_ClockDivision = 0;
    TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;  
    TIM_TimeBaseInit(TIM3, &TIM_TimeBaseStructure);

    //通道1配置
    TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM2; 
    TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable; 
    TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High; 
    TIM_OC2Init(TIM3, &TIM_OCInitStructure);  
    TIM_OC2PreloadConfig(TIM3, TIM_OCPreload_Enable);  

    //通道2配置
    TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM2; 
    TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable; 
    TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High; 
    TIM_OC1Init(TIM3, &TIM_OCInitStructure);  
    TIM_OC1PreloadConfig(TIM3, TIM_OCPreload_Enable);  

    TIM_Cmd(TIM3, ENABLE);  

}

 int main(void)
 {      
    u16 led0pwmval=0;
    u8 dir=1;   
    delay_init();            
    NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2); 

    LED_Init();             
    TIM3_PWM_Init(20000-1,72-1);    
  while(1)
    {
        TIM_SetCompare2(TIM3,20000-500);
        TIM_SetCompare1(TIM3,20000-500);
        delay_ms(1000); 
        TIM_SetCompare2(TIM3,20000-550);
        TIM_SetCompare1(TIM3,20000-550);
        delay_ms(1000);         
    }    
 }

STM32单片机通过USART1接收到数据后，怎么把接收到的数据通过单片机的CAN口发送出去啊串口接受内容是报文吗？

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