求帮忙看看这个stm8呼吸灯代码有什么错误

2019-07-14 13:32发布

主函数
void main(void)
{
  LED_Init(LED3);
  CLOCK_Hse(CPUDIV1);//设置系统时钟为 HSE 的一分频，即 16M
  tiMER2_PWMInit(1000,0);//初始化 TIM2 参数
  uint16_t i=0, PWM=0;
  while (1)
  {
if(i == 0)
{
   PWM+=10;
   if(PWM == 1000)
   {
      i=1;
   }
}
else
{
   PWM-=10;
   if(PWM == 0)
   {
      i=0;
   }
}
TIM2_SetCompare3(PWM);
  }
}

pwm.c
void TIMER2_PWMInit(unsigned short timebase,unsigned short t)
{
TIM2_DeInit();
/*
   * TIM2 Frequency = TIM2 counter clock/(ARR + 1)
   * 这里设置TIM2的计数频率为 16M/8/(timebase+1)=1K
   */
TIM2_TimeBaseInit(TIM2_PRESCALER_16, timebase);//分频和ARRL、ARRH初始化TIME2时基单元

/*
   * PWM1 Mode configuration: Channel1
   * TIM2 Channel1 duty cycle = [TIM2_CCR1/(TIM2_ARR + 1)] * 100 = 50%
   * TIM2 Channel2 duty cycle = [TIM2_CCR2/(TIM2_ARR + 1)] * 100 = 50%
   */

/* 测试通道1 */
TIM2_OC3Init(TIM2_OCMODE_PWM1, TIM2_OUTPUTSTATE_ENABLE, t, TIM2_OCPOLARITY_HIGH);//CCER的控制
TIM2_OC3PreloadConfig(ENABLE);//开启预装载
TIM2_Cmd(ENABLE);
}

附上原理图