stm32使用TIM1_CH1和TIM1_CH4 即PA8和PA9输出双路PWM遇到的问题

正在使用stm32的TIM1 打算输出两路可控的pwm波形，要求两路单独控制，占空比可调，频率统一，调试过程中发现，

pa8 的tim1 ch1好使，tim1ch4不好使。tim1共有4路可控的，管脚是PA8 PA9 PA10 PA11,中间两路用于串口调试了。

经过keil软件仿真比较发现，tim1ch4的配置不对。如图

同时提供一种解决方法，当有一个正常使用的时候可以通过，软件仿真查看配置，然后进行比较并打钩后再试运行，可解决类似问题。

pwm的波形中一个是65%，下边是85%。

timer的配置看源码：

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_GPIOA , ENABLE);  


   //????????????,??TIM1 CH1PWM
    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_8; //TIM_CH1
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;  //
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_Init(GPIOA, &GPIO_InitStructure);
   
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_11; //TIM_CH4
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;  //
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_Init(GPIOA, &GPIO_InitStructure);



    TIM_TimeBaseStructure.TIM_Period = arr; 
    TIM_TimeBaseStructure.TIM_Prescaler =psc; // TIMx
    TIM_TimeBaseStructure.TIM_ClockDivision = 0; //??????:TDTS = Tck_tim
    TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;  //TIM
    TIM_TimeBaseInit(TIM1, &TIM_TimeBaseStructure); //


    TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM2; //
    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_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_PWM2; //
    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_OC1PreloadConfig(TIM1, TIM_OCPreload_Enable);  //CH1
    TIM_OC4PreloadConfig(TIM1, TIM_OCPreload_Enable);  //CH4
    TIM1->CCER  |=  TIM_CCER_CC4P;
    TIM_CtrlPWMOutputs(TIM1,ENABLE);    //MOE
    TIM_ARRPreloadConfig(TIM1, ENABLE); //??TIMxARR

    TIM_Cmd(TIM1, ENABLE);  //??TIM1

 // TIM_SetCompare4(TIM1,1000); 
 
  
}

main里边如下使用
TIM1_PWM_Init(4799,0);//ƵÂÊPWM=72000/(4799+1)=15 Khz 
Motor_forw();
//set_pwm1(15000,5000);//15KHZ  50%
//set_pwm1(15000,6000);
set_pwm1(15000,6500);
set_pwm2(15000,8500);