STM8S TIM2 输出PWM初始化函数-EDA365

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STM8S TIM2 输出PWM初始化函数

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参考网上例程总结出初始化函数

#define TIM2_CLK 16000000

void timer2_Init(char channal, ulong hz,int pwm)

{

TIM2_ARRH = (TIM2_CLK/hz)/256;

TIM2_ARRL = (TIM2_CLK/hz)%256;

switch (channal)

{

case 1:{

TIM2_CCMR1 |= 0x70;

TIM2_CCER1 |= 0x03; //通道1使能，低电平有效，配置为输出

TIM2_CCR1H = (((TIM2_CLK/hz)*pwm)/1000)/256;

TIM2_CCR1L = (((TIM2_CLK/hz)*pwm)/1000)%256;

break;

}

case 2:{

TIM2_CCMR2 |= 0x70;

TIM2_CCER1 |= 0x30; //通道2

TIM2_CCR2H = (((TIM2_CLK/hz)*pwm)/1000)/256;

TIM2_CCR2L = (((TIM2_CLK/hz)*pwm)/1000)%256;

break;

}

case 3:{

TIM2_CCMR3 |= 0x70; //01110000

TIM2_CCER2 |= 0x03; //通道3

TIM2_CCR3H = (((TIM2_CLK/hz)*pwm)/1000)/256;

TIM2_CCR3L = (((TIM2_CLK/hz)*pwm)/1000)%256;

break;

}

}

//TIM2_CCMR3 |= 0X04; //输出比较3预装载使能

TIM2_PSCR = 0;

TIM2_CR1 = TIM2_CR1 | 0x01;

}

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