sys_init.c

我用RealView MDK编译的周立功实验程序

#include <LPC213X.H>
#include "Config.H"

void  sys_init()
{
	// 系统频率初始化
	PLLCON = 1;
	VPBDIV = 0x01;
	PLLCFG = 0x23;

	PLLFEED = 0xaa;
	PLLFEED = 0x55;
	while((PLLSTAT & (1 << 10)) == 0);
	PLLCON = 3;
	PLLFEED = 0xaa;
	PLLFEED = 0x55;

	// 设置3个CCLK周期访问Flash存储器
	MAMCR   = 0;
	MAMTIM  = 0x03;
	MAMCR   = 2;

	// 中断初始化
	VICIntEnClr = 0xffffffff;
	VICVectAddr = 0;
	VICIntSelect = 0;
}

//注意:本函数应放在main()中,具体位置应当放在main()中定义的各个变量之后