led1.c

来自「ARM7实现一个简单的LED点亮程序」· C语言 代码 · 共 68 行

#include"LPC213x.h"
#include"config.h"

void delay(uint32 t)
{
	uint32 i;
	while(t--)
	{
		for(i=0;i<5000;i++);
	}
}


void DisablePLL(void)
{
	PLLCON=0X00000000;
	PLLCFG=0X00000000;
	PLLFEED=0X000000AA;
	PLLFEED=0X00000055;

	while((PLLSTAT & 0X00000300)!=0);//wait for PLLE=0 AND PLLC=0	
}

void EnablePLL(void)
{
	PLLCON=0X00000003;
	PLLCFG=0X00000043;
	PLLFEED=0X000000AA;
	PLLFEED=0X00000055;
	
	while((PLLSTAT & 0X00000400)==0);//wait for PLOCK=1
	
}

int Main(void)
{
	uint32 i;
	uint32 j;
	
	EnablePLL();
	
//	PINSEL2=0X00000000;
	PINSEL2=PINSEL2 | 0X000000C0;
	IO1DIR=0XFFFFFFFF;
	IO1PIN=0X00000000;
	while(1)
	{
		i=0;
		j=0x00040000;
		while(i<8)
		{
			IO1PIN=IO1PIN | j;
			j<<=1;
			i++;
			delay(200);
		}
		i=0;
		j=0x00040000;
		while(i<8)
		{
			IO1PIN=IO1PIN & (~j);
			j<<=1;
			i++;
			delay(200);
		}
	}
}