pc51

C51串口程序

#include "reg51.h"
#include "com.h"
#define TimeLen 2000			// 定时器定时时间长度	

unsigned short  Loop_Num  ;		// 转动圈数
unsigned char	Led_Buf[4] ={1,2,3,4};	// 存放数码管显示的数
unsigned char	Led_Sel = 0 ;	// 动态扫描中选中的数码管号	

#define	LEDDAT_P	P0 			// 数码管数据管脚
#define	LEDSEL_P  	P2 		// 数码管使能选择管脚

#define LED_NUM		4			// 数码管个数

// 数码管数据
code  unsigned char LED_CODE[21]={0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x82,0xf8,0x80,0x90,
  0x40,0x79,0x24,0x30,0x19,0x12,0x02,0x78,0x00,0x10,0xbf};
void InitCom( void );
// 定时器0初始
void  Time0Init(void)
{
  	TMOD= 0x01 ;
	TR0= 1 ;
	ET0= 1 ;
	EA= 1 ;
	TL0= ( 65536-TimeLen ) % 256 ;
	TH0= ( 65536-TimeLen ) / 256 ;
}


 // 每20毫秒调用 动态扫描
void timer0(void) interrupt 1
{

	TL0= ( 65536-TimeLen ) % 256 ;
	TH0= ( 65536-TimeLen ) / 256 ;

	LEDDAT_P = ~LED_CODE[Led_Buf[Led_Sel]] ;		// 动态扫描显示
	LEDSEL_P = 0x01 << Led_Sel ;
	Led_Sel++;
	if( Led_Sel == LED_NUM )Led_Sel=0;


}
main()
{
	//Time0Init() ;
	//InitCom() ;
	while(1);
}