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51單片機驅動1602顯示萬年歷
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實驗注意：332電阻非常重要，以前做過類似的實驗沒有顯示成功，就是電阻的問題，電阻太小不行，一般要超過1.5K，當然太大也不行。
實驗名稱：51單片機驅動1602顯示萬年歷
實驗說明：本實驗使用硬件連接，相對于proteus仿真軟件，更切合實際，體驗在硬件制作過程中遇到的問題與解決的過程
實驗硬件工具：51單片機最小模塊，1602顯示屏，一個332（3300歐姆）貼片小電阻，杜邦線若干
#include<reg52.h>
#define DataPort P1
sbit RS=P2^4;
sbit RW=P2^3;
sbit E=P2^2;
char table1[]="0123456789-";
int second = 0; //¶¨òåÃë
int point = 0; //¶¨òå·Ö
int hour = 23; //¶¨òåD¡ê±
int timer_cnt = 0;
void delay1ms() //@12.000MHz
{
unsigned char i, j;
i = 12;
j = 169;
do
{
while (--j);
} while (--i);
}
void delay3ms() //@12.000MHz
{
unsigned char i, j;
i = 100;
j = 1;
do
{
while (--j);
} while (--i);
}
void timer0init()
{
TMOD = 0x01; //éèÖö¨ê±Æ÷0Îa1Ä￡ê½16λ¼ÆêyÄ￡ê½
ET0 = 1; //¿a¶¨ê±Æ÷0ÖD¶Ï
EA = 1; //¿a×üÖD¶Ï
TH0 = (65536-5000)/256; //¸ø¼ÆêyÆ÷¸ß°Ëλ¸33õÖμ
TL0 = (65536-5000)%256; //¸ø¼ÆêyÆ÷μí°Ëλ¸33õÖμ//¶¨ê±5000′ξíóD5msò»′ÎÖD¶Ï
TR0 = 1; //Æô¶ˉ¶¨ê±Æ÷
}
void WriteCmd(char cmd)
{
RS=0;
RW=0;
E=0;
DataPort=cmd;
delay3ms();
E=1;
delay1ms();
E=0;
}
void WriteDat(char dat)
{
RS=1;
RW=0;
E=0;
DataPort=dat;
delay3ms();
E=1;
delay1ms();
E=0;
}
void InitLcd1602() //D¾Æ¬3õê¼»ˉ
{
WriteCmd(0x38);
delay3ms();
WriteCmd(0x38);
delay3ms();
WriteCmd(0x38);
delay3ms();
WriteCmd(0x08);//1رÕÏÔê¾Æá
WriteCmd(0x01);//ÏÔê¾ÇåÆá
delay3ms();
WriteCmd(0x06);//ÏÔê¾1a±êòƶˉ
WriteCmd(0x0c);
//ÏÔ꾿a¼°1a±ê
}
void main()
{
int i;
InitLcd1602();
//D¾Æ¬3õê¼»ˉ
timer0init(); //3õê¼»ˉ¶¨ê±Æ÷
while(1)
{
WriteCmd(0x80);
WriteDat(table1[hour/10]);
WriteDat(table1[hour%10]);
WriteDat(table1[10]);
WriteDat(table1[point/10]);
WriteDat(table1[point%10]);
WriteDat(table1[10]);
WriteDat(table1[second/10]);
WriteDat(table1[second%10]);
}
}
void timer0() interrupt 1 //ÖD¶Ï·tÎñoˉêy
{
TH0 = (65536-5000)/256; //ÿ′νøÖD¶Ï¶¼òa¸ø¼ÆêyÆ÷ÖØD¸3Öμ
TL0 = (65536-5000)%256;
timer_cnt++; //óÃà′¼Æêy½øÖD¶Ï¶àéù′Î
if(timer_cnt==197) //μ±½øà′200′ÎÖD¶Ïê±oò¾íμÃò»Ãë￡¬second¼óò»
{
second++;
timer_cnt = 0;
}
if(second==60) //μ±Ãëμèóú60ê±
{
second = 0;
//ÃëÖØDÂÖμÎaáã
point++; //·Ö¼óò»
}
if(point==60) //μ±·Öμèóú60ê±
{
point = 0;
//·ÖÖμÎaáã
hour++; //D¡ê±¼óò»
}
if(hour==24)
{
hour = 0;
}
}
/*--------------------------------------------------------------------------
REG52.H
Header file for generic 80C52 and 80C32 microcontroller.
Copyright (c) 1988-2002 Keil Elektronik GmbH and Keil Software, Inc.
All rights reserved.
--------------------------------------------------------------------------*/
#ifndef __REG52_H__
#define __REG52_H__
/* BYTE Registers */
sfr P0 = 0x80;
sfr P1 = 0x90;
sfr P2 = 0xA0;
sfr P3 = 0xB0;
sfr PSW = 0xD0;
sfr ACC = 0xE0;
sfr B = 0xF0;
sfr SP = 0x81;
sfr DPL = 0x82;
sfr DPH = 0x83;
sfr PCON = 0x87;
sfr TCON = 0x88;
sfr TMOD = 0x89;
sfr TL0 = 0x8A;
sfr TL1 = 0x8B;
sfr TH0 = 0x8C;
sfr TH1 = 0x8D;
sfr IE = 0xA8;
sfr IP = 0xB8;
sfr SCON = 0x98;
sfr SBUF = 0x99;
/* 8052 Extensions */
sfr T2CON = 0xC8;
sfr RCAP2L = 0xCA;
sfr RCAP2H = 0xCB;
sfr TL2 = 0xCC;
sfr TH2 = 0xCD;
/* BIT Registers */
/* PSW */
sbit CY = PSW^7;
sbit AC = PSW^6;
sbit F0 = PSW^5;
sbit RS1 = PSW^4;
sbit RS0 = PSW^3;
sbit OV = PSW^2;
sbit P = PSW^0; //8052 only
/* TCON */
sbit TF1 = TCON^7;
sbit TR1 = TCON^6;
sbit TF0 = TCON^5;
sbit TR0 = TCON^4;
sbit IE1 = TCON^3;
sbit IT1 = TCON^2;
sbit IE0 = TCON^1;
sbit IT0 = TCON^0;
/* IE */
sbit EA = IE^7;
sbit ET2 = IE^5; //8052 only
sbit ES = IE^4;
sbit ET1 = IE^3;
sbit EX1 = IE^2;
sbit ET0 = IE^1;
sbit EX0 = IE^0;
/* IP */
sbit PT2 = IP^5;
sbit PS = IP^4;
sbit PT1 = IP^3;
sbit PX1 = IP^2;
sbit PT0 = IP^1;
sbit PX0 = IP^0;
/* P3 */
sbit RD = P3^7;
sbit WR = P3^6;
sbit T1 = P3^5;
sbit T0 = P3^4;
sbit INT1 = P3^3;
sbit INT0 = P3^2;
sbit TXD = P3^1;
sbit RXD = P3^0;
/* SCON */
sbit SM0 = SCON^7;
sbit SM1 = SCON^6;
sbit SM2 = SCON^5;
sbit REN = SCON^4;
sbit TB8 = SCON^3;
sbit RB8 = SCON^2;
sbit TI = SCON^1;
sbit RI = SCON^0;
/* P1 */
sbit T2EX = P1^1; // 8052 only
sbit T2 = P1^0; // 8052 only
/* T2CON */
sbit TF2 = T2CON^7;
sbit EXF2 = T2CON^6;
sbit RCLK = T2CON^5;
sbit TCLK = T2CON^4;
sbit EXEN2 = T2CON^3;
sbit TR2 = T2CON^2;
sbit C_T2 = T2CON^1;
sbit CP_RL2 = T2CON^0;
#endif
