请教stm32f103的pwm波输出的问题

创造与非的提问时间：2017-11-20 14:47 /

源程序是控制TIMI的CH1通道输出PWM 波，使PA8连接的LED 由亮到灭。现在我想增加三路一样的输出。  程序如下：
  但是PA9，PA10，PA11，都没有输出是为什么。怎么改才可以呢？

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 | RCC_APB2Periph_AFIO , ENABLE);  //使能GPIO外设时钟使能++++++


//设置该引脚为复用输出功能,输出TIM1 CH1的PWM脉冲波形
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_8 | GPIO_Pin_9 | GPIO_Pin_10 | GPIO_Pin_11;//TIM_CH1++++++++
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;  //复用推挽输出
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOA, &GPIO_InitStructure);

TIM_TimeBaseStructure.TIM_Period = arr; //设置在下一个更新事件装入活动的自动重装载寄存器周期的值    80K
TIM_TimeBaseStructure.TIM_Prescaler =psc; //设置用来作为TIMx时钟频率除数的预分频值  不分频
TIM_TimeBaseStructure.TIM_ClockDivision = 0; //设置时钟分割:TDTS = Tck_tim
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;  //TIM向上计数模式
TIM_TimeBaseInit(TIM1, &TIM_TimeBaseStructure); //根据TIM_TimeBaseInitStruct中指定的参数初始化TIMx的时间基数单位

TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1; //选择定时器模式:TIM脉冲宽度调制模式1+++++++++++++
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable; //比较输出使能
TIM_OCInitStructure.TIM_Pulse = 0; //设置待装入捕获比较寄存器的脉冲值
TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High; //输出极性:TIM输出比较极性高
TIM_OC1Init(TIM1, &TIM_OCInitStructure);  //根据TIM_OCInitStruct中指定的参数初始化外设TIMx

TIM_OCInitStructure.TIM_OutputState =TIM_OutputState_Enable; // +++++++
  TIM_OCInitStructure.TIM_Pulse = 0;
  TIM_OC2Init(TIM1, &TIM_OCInitStructure);
  TIM_OC2PreloadConfig(TIM1, TIM_OCPreload_Enable);

  TIM_OCInitStructure.TIM_OutputState =TIM_OutputState_Enable;
  TIM_OCInitStructure.TIM_Pulse = 0;
  TIM_OC3Init(TIM1, &TIM_OCInitStructure);
  TIM_OC3PreloadConfig(TIM1, TIM_OCPreload_Enable);

  TIM_OCInitStructure.TIM_OutputState =TIM_OutputState_Enable;
  TIM_OCInitStructure.TIM_Pulse = 0;
  TIM_OC4Init(TIM1, &TIM_OCInitStructure);
  TIM_OC4PreloadConfig(TIM1, TIM_OCPreload_Enable);

  TIM_CtrlPWMOutputs(TIM1,ENABLE); //MOE 主输出使能


TIM_OC1PreloadConfig(TIM1, TIM_OCPreload_Enable);  //CH1预装载使能    +++++++
   TIM_OC2PreloadConfig(TIM1, TIM_OCPreload_Enable);

TIM_ARRPreloadConfig(TIM1, ENABLE); //使能TIMx在ARR上的预装载寄存器

TIM_Cmd(TIM1, ENABLE);  //使能TIM1

}