STM8L TIM2外部触发

只看该作者 · 2017-8-3 09:29

各位坛友，有没有使用过STM8L151 timer2的ETR(PB3)来计数。小弟最近配置使用没有成功，update中断或计数中断都没有触发。请大家帮忙看看问题出在哪里？多谢！

main函数
void main()
{
  CLK_SYSCLKDivConfig(CLK_SYSCLKDiv_1); //内部时钟为1分频 = 16Mhz
  TIM2_Init();

  while(1)
  {
  }

}

timer2 的初始化
void TIM2_Init()
{

  GPIO_Init(GPIOB , GPIO_Pin_3 , GPIO_Mode_In_PU_No_IT);  //PB3为timer2 的外部触发入口，上拉输入无中断

  TIM2_DeInit(); //复位TIME2
  CLK_PeripheralClockConfig(CLK_Peripheral_TIM2,ENABLE); //开启TIME2的时钟
  TIM2_TimeBaseInit(TIM2_Prescaler_1,TIM2_CounterMode_Up,255);//不分频，计数 65535

  TIM2_ETRClockMode2Config(TIM2_ExtTRGPSC_OFF,TIM2_ExtTRGPolarity_NonInverted,0);//没有外部触发预分频器，高电平或上升沿有效，使能外部时钟模式2

  TIM2_SelectInputTrigger(TIM2_TRGSelection_ETRF); //选择外部触发
  TIM2_ARRPreloadConfig(ENABLE);

  TIM2_ClearFlag(TIM2_FLAG_Update);
  TIM2_ITConfig(TIM2_IT_Update,ENABLE); //打开更新中断
  TIM2_ClearFlag(TIM2_IT_Trigger);
  TIM2_ITConfig(TIM2_IT_Trigger,ENABLE); //打开触发中断

  TIM2_SetCounter(0);
  TIM2_Cmd(ENABLE);
}

中断函数
extern u8 ul;
INTERRUPT_HANDLER(TIM2_UPD_OVF_TRG_BRK_USART2_TX_IRQHandler,19)
{
/* In order to detect unexpected events during development,
   it is recommended to set a breakpoint on the following instruction.
*/
  if(TIM2_GetITStatus(TIM2_IT_Update) != RESET)
  {
ul++;
TIM2_ClearITPendingBit(TIM2_IT_Update);
  }
}

/**
  * @brief Timer2 Capture/Compare / USART2 RX Interrupt routine.
  * @param  None
  * @retval None
  */
INTERRUPT_HANDLER(TIM2_CC_USART2_RX_IRQHandler,20)
{
/* In order to detect unexpected events during development,
   it is recommended to set a breakpoint on the following instruction.
*/
if(TIM2_GetITStatus(TIM2_IT_Update) != RESET)
  {
ul++;
TIM2_ClearITPendingBit(TIM2_IT_Update);
  }
}

只看该作者 · 2017-8-3 10:24

学习了