main.c

ARM JTAG调试原理 ,用于嵌入式程序在线调试

#define GPFCON (*(volatile unsigned int *)0x56000050)
#define GPFDAT (*(volatile unsigned int *)0x56000054)
#define GPFUP (*(volatile unsigned int *)0x56000058)
void Delay(unsigned int);

int LedMain()
{
	unsigned char ledtab[]={0xdf,0xbf,0x7f};
	int i;

	GPFUP&= 0xffffff1f;//IO使能
	GPFCON&= 0xffff0000;//清零
	GPFCON|= 0x5400;//输出有效

	while(1)
	{
		for(i=0;i<3;i++)
		{
			GPFDAT=ledtab[i];
			Delay(10);
		}
	}	
	

	return(0);
}
/*延时函数*/
void Delay(unsigned int x)
{
	unsigned int i,j,k;
	for(i=0;i<=x;i++)
		for(j=0;j<0xff;j++)
			for(k=0;k<0xff;k++);
}