为什么同样是TIM1 复用IO就能输出PWM 不复用就不行？？？

xiaobudonglaosh · 发表于 2016-7-11 14:36:50

void TIM1_PWM_Init(void)//有复用
{
//此部分需手动修改IO口设置
RCC->APB2ENR|=1<<11;    //TIM1时钟使能
RCC->APB2ENR|=1<<6; //使能PORTE时钟

GPIOE->CRH&=0XFF0F0F0F; //PE9、PE11、PE13输出
GPIOE->CRH|=0X00B0B0B0; //复用功能输出

GPIOE->ODR|=0X0000; //输出1

RCC ->APB2ENR|=1<<0;
AFIO->MAPR&=0XFFFFFF3F;
AFIO->MAPR|=3<<6;

TIM1->ARR=999;
TIM1->PSC=0;

TIM1->CCMR1|=6<<4; //CH1 PWM1模式
TIM1->CCMR1|=1<<3; //CH1预装载使能
TIM1->CCMR1|=6<<12;    //CH2 PWM1模式
TIM1->CCMR1|=1<<11;    //CH2预装载使能
TIM1->CCMR2|=6<<4; //CH3 PWM1模式
TIM1->CCMR2|=1<<3; //CH3预装载使能

  TIM1->CCER|=1<<0;    //OC1 输出使能
  TIM1->CCER|=1<<4;    //OC2 输出使能
  TIM1->CCER|=1<<8;    //OC3 输出使能
TIM1->CR1=0x0080;
TIM1->CR1|=0x01;       //使能定时器1
  TIM1->BDTR|=0x8000;

}

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void TIM1_PWM_Init(void) //没复用
{
//此部分需手动修改IO口设置
RCC->APB2ENR|=1<<11;    //TIM1时钟使能
RCC->APB2ENR|=1<<2;       //使能PORTA时钟
RCC->APB2ENR|=1<<3;

GPIOA->CRH&=0XFFFFF000; //PA8、PA9、PA10输出 9\11\13
GPIOA->CRH|=0X00000BBB; //复用功能输出


TIM1->ARR=9999;
TIM1->PSC=0;

TIM1->CCMR1|=6<<4; //CH1 PWM1模式
TIM1->CCMR1|=1<<3; //CH1预装载使能
TIM1->CCMR1|=6<<12;    //CH2 PWM1模式
TIM1->CCMR1|=1<<11;    //CH2预装载使能
TIM1->CCMR2|=6<<4; //CH3 PWM1模式
TIM1->CCMR2|=1<<3; //CH3预装载使能

  TIM1->CCER|=1<<0;    //OC1 输出使能
  TIM1->CCER|=1<<4;    //OC2 输出使能
  TIM1->CCER|=1<<8;    //OC3 输出使能
TIM1->CR1=0x0080;
TIM1->CR1|=0x01;       //使能定时器1
  TIM1->BDTR|=0x8000;

}