定时器更新中断如何PWM一起用不产生冲突

begin · 发表于 2017-11-24 16:12:24

定时器更新中断如何PWM一起用不产生冲突，  设置了定时器1更新中断， 1通道跟4通道PWM输出，  实验通道4有输出，通道1无输出，差了很久找不出原因！

void TIM1_PWM_Init(u16 arr,u16 psc) //PWM输出初始化 arr：自动重装值  psc：时钟预分频数
{
TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;
NVIC_InitTypeDef NVIC_InitStructure;
  GPIO_InitTypeDef GPIO_InitStructure;
  TIM_OCInitTypeDef  TIM_OCInitStructure;

RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM1, ENABLE);//
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA , ENABLE);  //使能GPIO外设时钟使能

NVIC_InitStructure.NVIC_IRQChannel = TIM1_UP_IRQn;  //TIM1中断
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;  //先占优先级0级
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 3;  //从优先级3级
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; //IRQ通道被使能
NVIC_Init(&NVIC_InitStructure);  //根据NVIC_InitStruct中指定的参数初始化外设NVIC寄存器

//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; //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);

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_11; //TIM_CH4          ~~~~~~~~~~~~~~~~~~~~
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  PCS 7200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_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(TIM1, &TIM_OCInitStructure);  //根据TIM_OCInitStruct中指定的参数初始化外设TIMx

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

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_OC4Init(TIM1, &TIM_OCInitStructure);    //使能4通道~~~~~~~~~~~~~~~~~~~~~~~

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

TIM_OC4PreloadConfig(TIM1, TIM_OCPreload_Enable);  //CH4预装载使能    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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

TIM_Cmd(TIM1, ENABLE);  //使能TIM1

  TIM_ITConfig(  TIM1, TIM1_UP_IRQn, ENABLE    ); //使能或者失能指定的TIM中断更新中断  Update
}

void TIM1_UP_IRQHandler(void) //TIM1中断
{
if (TIM_GetITStatus(TIM1, TIM_IT_Update) != RESET) //检查指定的TIM中断发生与否:TIM 中断源
{
TIM_ClearITPendingBit(TIM1, TIM_FLAG_Update  );  //清除TIMx的中断待处理位:TIM 中断源
PDout(2)=~PDout(2);
}
}

int main(void)
{

GPIO_InitTypeDef  GPIO_InitStructure;

// NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);// 设置中断优先级分组2  整个程序只要设置一次分组

  RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA|RCC_APB2Periph_GPIOD, ENABLE);    //使能PA,PD端口时钟

  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_5|GPIO_Pin_6|GPIO_Pin_7|GPIO_Pin_8;    //LED0-->PA.8 端口配置
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;    //推挽输出
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;    //IO口速度为50MHz
  GPIO_Init(GPIOA, &GPIO_InitStructure);    //根据设定参数初始化GPIOA.8
  GPIO_SetBits(GPIOA,GPIO_Pin_8);    //PA.8 输出高

  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2;            //LED1-->PD.2 端口配置, 推挽输出
  GPIO_Init(GPIOD, &GPIO_InitStructure);          //推挽输出，IO口速度为50MHz
  GPIO_SetBits(GPIOD,GPIO_Pin_2);    //PD.2 输出高

delay_init();    //延时函数初始化
uart_init(115200);       //串口初始化
   KEY_Init() ;             //按键初始化
//    TIM3_Int_Init(4999,7199);
TIM1_PWM_Init(4999,0X1C20);    //初始化里面把频率设为10000 10000/(199+1)=50HZ

  while(1)
{

TIM_SetCompare1(TIM1,50);    //  CCR 设置脉宽  1=0.1ms
TIM_SetCompare4(TIM1,100);    //  CCR 设置脉宽  1=0.1ms

}