用stm32高级定时器产生4路两两互补的PWM移相带死区，定时器进不来中断，产生波形不对

只看该作者 · 2015-10-30 10:54

extern char Upflag;

void TIM_config(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
  TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;
TIM_OCInitTypeDef  TIM_OCInitStructure;
TIM_BDTRInitTypeDef TIM_BDTRInitStructure;
NVIC_InitTypeDef NVIC_InitStructure;

/* 互补管脚定义设置 */
//RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO, ENABLE);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA |RCC_APB2Periph_GPIOB , ENABLE);  //使能GPIO外设时钟使能

/* TIM1 clock enable */
RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM1, ENABLE);//

/*  管脚设配置*/
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_8 | GPIO_Pin_9;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP; //复用满负载输出为3.3V
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
  GPIO_Init(GPIOA, &GPIO_InitStructure);
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_13 | GPIO_Pin_14;
  GPIO_Init(GPIOB, &GPIO_InitStructure);

/* TIM时钟配置*/
TIM_TimeBaseStructure.TIM_Prescaler =0; //预分频
TIM_TimeBaseStructure.TIM_Period =1799; //0~65535 ,50HZ
TIM_TimeBaseStructure.TIM_CounterMode =TIM_CounterMode_CenterAligned1;
TIM_TimeBaseStructure.TIM_ClockDivision =0; //采样分频
TIM_TimeBaseStructure.TIM_RepetitionCounter = 0; //重复预分频，更新PWM占空比
TIM_TimeBaseInit(TIM1,&TIM_TimeBaseStructure); // 初始化时钟

/* PWM配置*/
TIM_OCInitStructure.TIM_OCMode =TIM_OCMode_PWM1; //输出比较模式，PWM模式1、2区别
/*
PWM模式1－在向上计数时，一旦TIMx_CNT<TIMx_CCR1时通道1为有效电平，否则为无效电平；
在向下计数时，一旦TIMx_CNT>TIMx_CCR1时通道1为无效电平(OC1REF=0)，否则为有效电平(OC1REF=1)。
PWM模式2－在向上计数时，一旦TIMx_CNT<TIMx_CCR1时通道1为无效电平，否则为有效电平；
在向下计数时，一旦TIMx_CNT>TIMx_CCR1时通道1为有效电平，否则为无效电平。
*/
TIM_OCInitStructure.TIM_OutputState =TIM_OutputState_Enable;
TIM_OCInitStructure.TIM_OCPolarity =TIM_OCPolarity_High;
TIM_OCInitStructure.TIM_Pulse =200; // 此处直接赋值设置占空比，或者在其他地方调用TIM_SetCompare1(TIM1,3000); 也可以更改占空比，本程序是main函数中调用修改的占空比

/*互补配置*/
TIM_OCInitStructure.TIM_OutputNState =TIM_OutputNState_Enable;
TIM_OCInitStructure.TIM_OCNPolarity =TIM_OCNPolarity_High;
TIM_OCInitStructure.TIM_OCIdleState =TIM_OCIdleState_Reset; //刹车之后的输出状态
TIM_OCInitStructure.TIM_OCNIdleState =TIM_OCNIdleState_Reset; //刹车之后的互补输出状态
TIM_OC1Init(TIM1,&TIM_OCInitStructure);

TIM_OCInitStructure.TIM_Pulse = 416;
TIM_OC2Init(TIM1, &TIM_OCInitStructure);
TIM_OCInitStructure.TIM_Pulse = 632;
TIM_OC3Init(TIM1, &TIM_OCInitStructure);

/* 死区配置*/
TIM_BDTRInitStructure.TIM_OSSRState =TIM_OSSRState_Enable; //运行模式下输出
TIM_BDTRInitStructure.TIM_OSSIState =TIM_OSSIState_Enable; //空闲模式下输出
TIM_BDTRInitStructure.TIM_LOCKLevel =TIM_LOCKLevel_OFF; //锁定级别
TIM_BDTRInitStructure.TIM_DeadTime =0x48; //设置死区时间  0-0xff；1us
/*

例如  10us 应该在第四区域
死区时间 =1/72*1000*(32+DTG)*16=10us; (72Mhz)
即： 13.89*(32+DTG)*16 =10000;
DTG =12.99  ~  13；
DTG[4:0]=13 对应16进制 D
因为是第四区域 DTG[7:5]=111 对应16进制 E
所以DTG = DTG[7:5]  +DTG[4:0] =0x0ED;
即TIM_BDTRInitStructure.TIM_DeadTime =0x0ED;
*/

TIM_BDTRInitStructure.TIM_Break = TIM_Break_Disable; //刹车使能关闭
  TIM_BDTRInitStructure.TIM_BreakPolarity = TIM_BreakPolarity_Low;       //刹车输出极性，即刹车控制引脚PB12接GND时，PWM停止输出
/*  刹车控制引脚为TIM1_BKIN pin(PB.12)，将PB12接GND，channel和其互补通道，都变为刹车后的电平，具体为0还是1，要看之前互补配置时对下列2个参数的设置：
.TIM_OCIdleState = TIM_OCIdleState_Reset; //刹车之后，PWM通道变为0
.TIM_OCNIdleState = TIM_OCNIdleState_Reset; //刹车之后，PWM互补通道变为0
注意：如果没必要，还是不要开启刹车功能，因为会对PWM产生影响，特别是当PB12悬空时，波形将会有很大的波动。
这里不打开刹车功能，即.TIM_Break = TIM_Break_Disable;
*/

TIM_BDTRInitStructure.TIM_AutomaticOutput =TIM_AutomaticOutput_Enable;
TIM_BDTRConfig(TIM1,&TIM_BDTRInitStructure);

TIM_ITConfig(TIM1,TIM_IT_Update,ENABLE ); //使能指定的TIM3中断,允许更新中断

/*开启PWM输出*/
TIM_CtrlPWMOutputs(TIM1,ENABLE); //PWM输出开启
TIM_OC1PreloadConfig(TIM1, TIM_OCPreload_Enable);  //CH1预装载使能
TIM_OC2PreloadConfig(TIM1, TIM_OCPreload_Enable);  //CH1预装载使能
TIM_OC3PreloadConfig(TIM1, TIM_OCPreload_Enable);  //CH1预装载使能

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

//中断优先级NVIC设置
NVIC_InitStructure.NVIC_IRQChannel = TIM1_UP_IRQn;  //TIM3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

TIM_Cmd(TIM1,ENABLE);

//    /* 时钟频率计算 */
// TimerPeriod = (SystemCoreClock / 100000) - 1;
// /*  计算相位差*/
// Channel1Pulse= (uint16_t) (((uint32_t) 5 * (TimerPeriod - 1)) / 10);
/* Compute CCR2 value to generate a duty cycle at 25%  for channel 2 */
//  Channel2Pulse = 604;// = (uint16_t) (((uint32_t) 25 * (TimerPeriod - 1)) / 100);
/* Compute CCR3 value to generate a duty cycle at 12.5%  for channel 3 */
// Channel3Pulse = 1108;// = (uint16_t) (((uint32_t) 125 * (TimerPeriod - 1)) / 1000);

}

//定时器1中断服务程序
void TIM1_IRQHandler(void) //TIM1中断
{
if (TIM_GetITStatus(TIM1, TIM_IT_Update) != RESET)  //检查TIM1更新中断发生与否
{
   TIM_ClearITPendingBit(TIM1, TIM_IT_Update  );  //清除TIMx更新中断标志
LED1=0;

if(Upflag==0)
  {
   Upflag=1;
   TIM_SetCompare1(TIM1,1600);
   TIM_SetCompare2(TIM1,1384);
   TIM_SetCompare3(TIM1,1168);
  }

  else if(Upflag==1)
  {
   Upflag=0;
   TIM_SetCompare1(TIM1,200);
   TIM_SetCompare2(TIM1,416);
   TIM_SetCompare3(TIM1,632);
  }

}
}