stmf103的输出互补PWM波 - - Powered by Discuz!

标题: stmf103的输出互补PWM波 [打印本页]

作者: wangpeiyuan 时间: 2018-7-21 20:20
标题: stmf103的输出互补PWM波
//TIM1_CH1 PWM输出初始化
//arr：自动重装值
//psc：时钟预分频数
void TIM1_PWM_Init(u16 arr,u16 psc)
{
RCC->APB2ENR|=1<<11; //TIM1时钟使能
RCC->APB2ENR|=1<<2;    //使能PORTA时钟
RCC->APB2ENR|=1<<3;    //使能PORTB时钟
RCC->APB2ENR|=1<<0;    //开启复用时钟

GPIOA->CRH&=0XFFFF0000; //PA8,9,10,11清除之前的设置
GPIOA->CRH|=0X0000BBBB; //PA8,9,10,11复用功能输出

GPIOB->CRH&=0X000FFFFF;  //PB13,14,15清除之前的设置
GPIOB->CRH|=0XBBB00000;  //PB13,14,15复用功能输出

GPIOB->ODR|=1<<13;    //PB13 输出上拉，低电平有效
GPIOB->ODR|=1<<14;    //PB14
GPIOB->ODR|=1<<15;    //PB15
GPIOA->ODR|=1<<8;       //PA8
GPIOA->ODR|=1<<9;       //PA9
GPIOA->ODR|=1<<10;    //PA10

TIM1->ARR=arr;          //设定计数器自动重装值    ①1
TIM1->PSC=psc;          //预分频器设置          ②2

TIM1->CCER|=1<<0;    //TIM1CH1 输出使能,高电平有效    ③3
TIM1->CCER|=1<<4;    //TIM1CH2 输出使能
TIM1->CCER|=1<<8;    //TIM1CH3 输出使能
TIM1->CCER|=1<<12;    //TIM1CH4 输出使能
TIM1->CCER|=1<<2;    //TIM1CH1N 互补输出使能
TIM1->CCER|=1<<6;    //TIM1CH2N 互补输出使能
TIM1->CCER|=1<<10;    //TIM1CH3N 互补输出使能

TIM1->CCMR1|=7<<4;    //CH1 PWM2模式          ④4
TIM1->CCMR1|=1<<3;    //CH1预装载使能

TIM1->CCMR1|=7<<12; //CH2 PWM2模式
TIM1->CCMR1|=1<<11; //CH2预装载使能

TIM1->CCMR2|=7<<4;    //CH3 PWM2模式
TIM1->CCMR2|=1<<3;    //CH3预装载使能

TIM1->CCMR2|=7<<12; //CH4 PWM2模式
TIM1->CCMR2|=1<<11; //CH4预装载使能

      TIM1->BDTR|=0x14;    //死区时间设置       ⑤5
TIM1->BDTR|=1<<15;    //MOE 主输出使能       ⑥6
TIM1->CR1 |= 0x80;    //ARPE使能,开始所有输出通道,默认向上计数 ⑦7
TIM1->CR1 |= 0x01;    //使能计数器
}

int main(void)
{
Stm32_Clock_Init(9);    //系统时钟设置
delay_init(72);          //延时初始化
TIM1_PWM_Init(499,7199); // 72M/7200=10khz, 1/10khz * 500=50ms ⑧8
while(1)
{
      TIM1->CCR1=250;  //占空比：50%  低电平时长25ms ⑨9
      TIM1->CCR2=125;  //占空比：75%  低电平时长12.5ms
      TIM1->CCR3=50;    //占空比：90% 低电平时长5ms
      TIM1->CCR4=25;    //占空比：95% 低电平时长2.5ms
}
}

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