stm8s105k4单片机PWM波配置 -

标题: stm8s105k4单片机PWM波配置 [打印本页]

作者: 于子豪 时间: 2021-5-2 15:31
标题: stm8s105k4单片机PWM波配置
//ccr = 0~499
void setPWM1(unsigned short ccr){//PC1
  TIM1_CCR1H = (unsigned char)(ccr>>8);
  TIM1_CCR1L = (unsigned char)(ccr & 0xff);
}
void setPWM2(unsigned short ccr){//PC2
  TIM1_CCR2H = (unsigned char)(ccr>>8);
  TIM1_CCR2L = (unsigned char)(ccr & 0xff);
}
void setPWM3(unsigned short ccr){//PC3
  TIM1_CCR3H = (unsigned char)(ccr>>8);
  TIM1_CCR3L = (unsigned char)(ccr & 0xff);
}
void setPWM4(unsigned short ccr){//PC4
  TIM1_CCR4H = (unsigned char)(ccr>>8);
  TIM1_CCR4L = (unsigned char)(ccr & 0xff);
}
void TIM1_init(void)
{
  TIM1_PSCRH = 0x01; // 8M系统时钟经预分频f=fck/(PSCR+1)
  TIM1_PSCRL = 0x3F; // PSCR=0x13f，f=8M/(0x13F+1)=25 000Hz，每个计数周期40us
  TIM1_ARRH = 0x01;    // 自动重载寄存器ARR=0x01F4=500
  TIM1_ARRL = 0xF4;    // 每记数500次产生一次中断，即20ms
  /**
  * PWM 配置
  */
  PC_DDR |= 0x1E; PC_CR1 |= 0x1E; PC_ODR &= ~0x1E;

  TIM1_CCMR1 = 0x78;
  TIM1_CCMR2 = 0x78;
  TIM1_CCMR3 = 0x78;
  TIM1_CCMR4 = 0x78;// Output mode PWM2.
                  // 通道 2 被设置成比较输出方式, OC2M = 111,为 PWM 模式 2, 向上计数时，若计数器小于比较值，为无效电平
  TIM1_CCER1 = 0x33;
  TIM1_CCER2 = 0x33;// CC polarity low,enable PWM output */
                  // CC2P = 1，低电平为有效电平
                  // CC2E = 1，开启输出引脚
  //设置占空比
  setPWM1(0);  setPWM2(0);
  setPWM3(0);  setPWM4(0);

  TIM1_EGR=0X01; //重新初始化计数器，并产生一个更新事件，可以不要
  TIM1_BKR=0x80; //主输出使能，必须要有

  TIM1_IER = 0x01;    // 允许更新中断
  TIM1_CR1 = 0x01;    // 计数器使能，开始计数
}

//main()
int i = 0;
for(i=0;i<23;i++){ setPWM1(i*i);delay_ms(50); }
for(i=22;i>0;i--){ setPWM1(i*i);delay_ms(50); }
for(i=0;i<23;i++){ setPWM2(i*i);delay_ms(50); }
for(i=22;i>0;i--){ setPWM2(i*i);delay_ms(50); }
for(i=0;i<23;i++){ setPWM3(i*i);delay_ms(50); }
for(i=22;i>0;i--){ setPWM3(i*i);delay_ms(50); }
for(i=0;i<23;i++){ setPWM4(i*i);delay_ms(50); }
for(i=22;i>0;i--){ setPWM4(i*i);delay_ms(50); }
setPWM1(0);  setPWM2(0);
setPWM3(0);  setPWM4(0);
delay_ms(3000);*/

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