ARM寄存器的操作方法

版权声明：转载博客需经博主允许，未经允许禁止转载 https://blog.csdn.net/qq_41673920/article/details/86678178

#define GPIOCOUT    *((volatile unsigned int *)0xc001c000)
#define GPIOCOUTENB *((volatile unsigned int *)0xc001c004)
#define GPIOCALTFN0 *((volatile unsigned int *)0xc001c020)

void delay(unsigned int);

void led_test(void)
{
    /*配置选择GPIOC12管脚的功能1*/
    GPIOCALTFN0 &= ~(3<<24);//清0 bit24 25
    GPIOCALTFN0 |= (1<<24);//置1 bit24
    /*设置为输出模式*/
    GPIOCOUTENB |= (1<<12);
    while(1)
    {
        /*亮*/
        GPIOCOUT &= ~(1<<12);//清0 bit12
        delay(0x1000000) ;
        /*灭*/
        GPIOCOUT |= (1<<12);//置1输出高电平
        delay(0x1000000) ;
    }
}
void delay(unsigned int n)
{
    while(n--) ;
}