STM8S TIM1寄存器 PWM呼吸灯

STM8S TIM1寄存器 PWM呼吸灯

原理图：

1.TIM1 初始化

void  TIM1_Init(void)
{
    TIM1_PSCRH = 0;
    TIM1_PSCRL = 15;          //(15+1)分频为1M
    TIM1_ARRH = 0x03;
    TIM1_ARRL = 0xE8;        //每1000us中断一次
    
    TIM1_CCMR2_OC2M = 6;      //PWM2模式1
    TIM1_CCER1_CC2E = 1;      //CC2引脚使能
    
    TIM1_CCMR3_OC3M = 6;      //PWM3模式1
    TIM1_CCER2_CC3E = 1;      //CC3引脚使能
    
    TIM1_CCR2H = 0X00;        //DUTY             
    TIM1_CCR2L = 0x00;            
    
    TIM1_CCR3H = 0X00;        //DUTY             
    TIM1_CCR3L = 0x00;       
    TIM1_BKR |= 0x80;         //设置刹车寄存器
    TIM1_IER = 0x01;         //允许更新中断
    TIM1_CR1 = 0x01;         //计数器使能，开始计数
}
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2.设置占空比

void pwm1_duty(u16 duty)
{
  TIM1_CCR2H=duty>>8;
  TIM1_CCR2L=(u8)(duty);
  TIM1_CCR3H=duty>>8;
  TIM1_CCR3L=(u8)(duty);
}
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3.呼吸

  while(1)
  {
    if(key_value>=1000) dir=0;
    if(key_value<=1) dir=1;
    if(dir) key_value++;
    else key_value--;
    pwm1_duty(key_value);
    delay_ms(3);
  }
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4.实验现象：