【野火】视频点亮【正点原子】LED

寄存器点亮：
         //打开GPIOD时钟
        *(unsigned int *)0x40021018 |=(1<<3);
        //配置PD2口为输出低模式
        *(unsigned int *)0x40010C00 |=(1<<4*5);
        //PD2 输出低
        *(unsigned int *)0x40010C0C &=~(1<<5);
        *(unsigned int *)0x4001140C |=(1<<2);

//以下是对应一步步优化

RCC_APB2ENR  |= ((1)<<3);
GPIOB_CRL   |= ((1)<<(4*5));
GPIOB_ODR &=~(1<<5);

//

RCC_APB2ENR  |= ((1)<<3);

GPIOB->CRL   |= ((1)<<(4*5));
GPIOB->ODR &=~(1<<5);
 

//

RCC_APB2ENR  |= ((1)<<3);

GPIOB->CRL   |= ((1)<<(4*5));

GPIO_SetBits(GPIOB,GPIO_PIN_0);