MINI开发板，TIM2_CH1~~~TIM2_CH3开启PWM，再开启串口1，结果发生了乱码。

void uart_init(u32 bound){
  //GPIO端口设置
  GPIO_InitTypeDef GPIO_InitStructure;
        USART_InitTypeDef USART_InitStructure;
        NVIC_InitTypeDef NVIC_InitStructure;
         
        RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1|RCC_APB2Periph_GPIOA, ENABLE);        //使能USART1，GPIOA时钟

        //USART1_TX   GPIOA.9
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9; //PA.9
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;        //复用推挽输出
  GPIO_Init(GPIOA, &GPIO_InitStructure);//初始化GPIOA.9

  //USART1_RX          GPIOA.10初始化
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;//PA10
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;//浮空输入
  GPIO_Init(GPIOA, &GPIO_InitStructure);//初始化GPIOA.10  

  //Usart1 NVIC 配置
  NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQn;
        NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=3 ;//抢占优先级3
        NVIC_InitStructure.NVIC_IRQChannelSubPriority = 3;                //子优先级3
        NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;                        //IRQ通道使能
        NVIC_Init(&NVIC_InitStructure);        //根据指定的参数初始化VIC寄存器

   //USART 初始化设置

        USART_InitStructure.USART_BaudRate = bound;//串口波特率
        USART_InitStructure.USART_WordLength = USART_WordLength_8b;//字长为8位数据格式
        USART_InitStructure.USART_StopBits = USART_StopBits_1;//一个停止位
        USART_InitStructure.USART_Parity = USART_Parity_No;//无奇偶校验位
        USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;//无硬件数据流控制
        USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;        //收发模式

  USART_Init(USART1, &USART_InitStructure); //初始化串口1
  USART_ITConfig(USART1, USART_IT_RXNE, ENABLE);//开启串口接受中断
  USART_Cmd(USART1, ENABLE);                    //使能串口1

}



void PWM_Mode_Config(u16 arr,u16 psc)
{
        TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;
        TIM_OCInitTypeDef  TIM_OCInitStructure;
                  
        RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE);        

        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(TIM2, &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_PWM2; //选择定时器模式:TIM脉冲宽度调制模式2
        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(TIM2, &TIM_OCInitStructure);  //根据TIM_OCInitStruct中指定的参数初始化外设TIMx
        TIM_OC2Init(TIM2, &TIM_OCInitStructure);  //根据TIM_OCInitStruct中指定的参数初始化外设TIMx
        TIM_OC3Init(TIM2, &TIM_OCInitStructure);  //根据TIM_OCInitStruct中指定的参数初始化外设TIMx
        TIM_OC4Init(TIM2, &TIM_OCInitStructure);  //根据TIM_OCInitStruct中指定的参数初始化外设TIMx

  //TIM_CtrlPWMOutputs(TIM2,ENABLE);        //MOE 主输出使能       

        TIM_OC1PreloadConfig(TIM2, TIM_OCPreload_Enable);  //CH1预装载使能
        TIM_OC2PreloadConfig(TIM2, TIM_OCPreload_Enable);       
        TIM_OC3PreloadConfig(TIM2, TIM_OCPreload_Enable);       
        TIM_OC4PreloadConfig(TIM2, TIM_OCPreload_Enable);         
       
        TIM_ARRPreloadConfig(TIM2, ENABLE); //使能TIMx在ARR上的预装载寄存器
       
        TIM_SetCompare1(TIM2,0);
        TIM_SetCompare2(TIM2,0);
        TIM_SetCompare3(TIM2,0);
        TIM_SetCompare4(TIM2,0);

        TIM_Cmd(TIM2,ENABLE);        //使能TIM2
}



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