stm32f0求助！中断后不能跳转回

2013-1-13 16:23

我是用tim2控制pwm输出伪232通信，发现tim2中断后无法停止，请大家看看。
void TIM_Config(void)
{
  GPIO_InitTypeDef GPIO_InitStructure;

  /* GPIOA Clocks enable */
  RCC_AHBPeriphClockCmd( RCC_AHBPeriph_GPIOB, ENABLE);

  /* GPIOA Configuration: Channel 1, 2, 3 and 4 as alternate function push-pull */
  //GPIO_InitStructure.GPIO_Pin = GPIO_Pin_8 | GPIO_Pin_9 | GPIO_Pin_10 | GPIO_Pin_11;
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_1 ;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
  GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
  GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP ;
  GPIO_Init(GPIOB, &GPIO_InitStructure);
GPIO_PinAFConfig(GPIOB, GPIO_PinSource1, GPIO_AF_1);
}
  int PV_pwm_init(void)
{
TIM_Config();
TimerPeriod = (SystemCoreClock / 100000 ) - 1;
Channel4Pulse = (uint16_t) (((uint32_t) 5 * (TimerPeriod- 1)) / 10);
/* TIM3 clock enable */
  RCC_APB1PeriphClockCmd(RCC_APB1ENR_TIM3EN , ENABLE);
/* Time Base configuration */
  TIM_TimeBaseStructure.TIM_Prescaler = 0;
  TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
  TIM_TimeBaseStructure.TIM_Period = TimerPeriod;
  TIM_TimeBaseStructure.TIM_ClockDivision = 0;
  TIM_TimeBaseStructure.TIM_RepetitionCounter = 0;

  TIM_TimeBaseInit(TIM3, &TIM_TimeBaseStructure);

  /* Channel 1, 2, 3 and 4 Configuration in PWM mode */
  TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;
  TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
  TIM_OCInitStructure.TIM_OutputNState = TIM_OutputNState_Enable;
  TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_Low;
  TIM_OCInitStructure.TIM_OCNPolarity = TIM_OCNPolarity_High;
  TIM_OCInitStructure.TIM_OCIdleState = TIM_OCIdleState_Set;
  TIM_OCInitStructure.TIM_OCNIdleState = TIM_OCIdleState_Reset;
TIM_OCInitStructure.TIM_Pulse = Channel4Pulse;
  TIM_OC4Init(TIM3, &TIM_OCInitStructure);
return 0;
}
int main(void)
{

2013-1-13 16:25

int main(void)
{
char a_pwm_test[]={55,55,55,55,55,55,55,55,55,55};
PV_pwm_init();
Init_TM2();
while(PWMInterface_char(a_pwm_test,10)==0)
{
while(PWMInterface_char(a_pwm_test,10)!=0);
testnum++;
}

return 0;
}
void Init_TM2(void)
{
TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;
    TIM_OCInitTypeDef       TIM_OCInitStructure;
    NVIC_InitTypeDef       NVIC_InitStructure;
// TIM3 Periph clock enable
    // 定时器2外设时钟使能
    RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE);
// TIM2 Configuration
    // 定时器2配置
    TIM_DeInit(TIM2);

    // 配置定时器2内部时钟
    TIM_InternalClockConfig(TIM2);
    TIM_TimeBaseStructInit(&TIM_TimeBaseStructure);
    TIM_OCStructInit(&TIM_OCInitStructure);
    // Time base configuration
    // 时间基数配置
    //设定1s一次
    TIM_TimeBaseStructure.TIM_Period = 0x4480;
    TIM_TimeBaseStructure.TIM_Prescaler = 0x0;
   TIM_TimeBaseStructure.TIM_ClockDivision = 0x0;
    TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
    TIM_TimeBaseInit(TIM2, &TIM_TimeBaseStructure);
    TIM_ITConfig(TIM2, TIM_IT_CC1, ENABLE);
   // TIM2 TRGO selection
    // 定时器TRGO选择
    TIM_SelectOutputTrigger(TIM2, TIM_TRGOSource_Update);
    //优先级最低
    //nvic
    NVIC_InitStructure.NVIC_IRQChannel = TIM2_IRQn;
    NVIC_InitStructure.NVIC_IRQChannelPriority = 0x01;
    NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);

2013-1-13 16:27

int SEND_Proc(void)
{
  send_completechar=0;//发送未完成
TIM_Cmd(TIM2, ENABLE);
  while(1)
  {
  if(send_completechar==1)//发送已完成
  {
TIM_Cmd(TIM2, DISABLE);
//pwm is close ? close
if(pwmflag==0)//0 is open
{
   //如果状态开启则关闭
   TIM_CtrlPWMOutputs(TIM3, DISABLE);
   TIM_Cmd(TIM3, DISABLE);
   pwmflag=1;
}
//init bit control
pwmout_numbit=0;
//send next byte
pwmout_numbyte++;
return 0;
  }
}
}

  int PWMInterface_char(char arry[],int numarry)
{
  int i;
char norm=0x01;
pwmout_numbyte=0;
  if((arry==0)||(numarry<=0))
{
return -1;
}
  else
{
//loop send byte end to complete send
while((numarry-pwmout_numbyte)>0)
{
   //get every bit add head and end
   for(i=0;i<10;i++)
   {
   if(i==0)
      {
      //add head
      pwmtim_swap[0]=0;
      }
   else if(i==9)
      {
      //add end
      pwmtim_swap[9]=1;
      }
   else
      {
      if((arry[pwmout_numbyte]&(norm<<(i-1)))>0)
      {
         pwmtim_swap[i]=1;
      }
      else
      {
         pwmtim_swap[i]=0;
      }
      }
   }
   //begain send
   while(SEND_Proc());
   //check byte send
   if(pwmout_numbyte==numarry)
   {
   //get every bit add head and end
   for(i=0;i<10;i++)
      {
      if(i==0)
      {
         //add head
         pwmtim_swap[0]=0;
      }
      else if(i==9)
      {
         //add end
         pwmtim_swap[9]=1;
      }
      else
      {
         if((((char)pwmout_numbyte)&(norm<<(i-1)))>0)
         {
         pwmtim_swap[i]=1;
         }
         else
         {
         pwmtim_swap[i]=0;
         }
      }
      }
   //begain send check byte
   while(SEND_Proc());
   }

}
}
  return 0;
}

2013-1-13 16:29

中断程序
void TIM2_IRQHandler(void)
{
if (TIM_GetITStatus(TIM2, TIM_IT_CC1) != RESET)
  {
if(send_completechar==0)  //发送未完成
{
   //计数138次
   if(count_pwm==0)
   {
   count_pwm=0;
      if(pwmout_numbit==9)
      {
      send_completechar=1;//已经传输完成10 bit（这里已经完成了）
      //TIM_Cmd(TIM2, DISABLE);
      }
      else
      {
      if(pwmtim_swap[pwmout_numbit]==1)
      {
         //open pwm tim
         if(pwmflag==1)// 1 is close
         {
            //如果状态关闭则开启
            TIM_CtrlPWMOutputs(TIM3, ENABLE);
            TIM_Cmd(TIM3, ENABLE);
            pwmflag=0;
         }
      }
      else
      {
         //close pwm tim
         if(pwmflag==0)//0 is open
         {
         //如果状态开启则关闭
            TIM_CtrlPWMOutputs(TIM3, DISABLE);
            TIM_Cmd(TIM3, DISABLE);
         pwmflag=1;
         }
         }
      pwmout_numbit++;
      }

   }
   else
   {
   }
}
TIM_ClearITPendingBit(TIM2, TIM_IT_CC1);
  }
}
发现根本跳不回SEND_Proc的if(send_completechar==1)//发送已完成

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