cpu.c

uboot底层驱动

	#include "my_printf.h"
	#define  write_reg(ADDR, DATE)  (*(unsigned  *)(ADDR) = (unsigned )(DATE))
  #define read_reg(ADDR)	(*(volatile unsigned  *)(ADDR))

	

	
void cpu_test(void)
{
	if (0x123c == read_reg(0x10001004))
		my_printf("系统时钟:75MHZ\n\r");
	else
		my_printf("系统时钟错误\n\r");
}