本程序所用的原理圖下載: 點這里 ，單片機芯片使用的stc89c51；找到時鐘部分的原理圖修改為你自己的電路上的io即可.這是一整個單片機開發板的電路圖其他的忽略.
/**************************通過串口通信調整時間******************************/
/**
*功能：單片機開始上電時點陣顯示倒計時3，2，1，0，然后點陣LED關閉顯示
* 定時器和串口開始工作，定時器開始一秒計時，并在數碼管上顯示時，分，秒
* 此計時器可以通過串口發送數據調整時間，可調整時與分，當調整分鐘時秒清零
* 附加功能：當單片機收到數據時有蜂鳴器響一聲作為提示
* 彩色流水燈以20毫秒的速度向左流動
*作者：徐冉
*日期：2013-06-15-09：15 - 12:10
*備注：程序已經順利通過調試
*/
/***********51hei開發板************/
/********AT89C52-RC MCU***********/
#include <reg52.h>
typedef unsigned int uint;
typedef unsigned char uchar;
sbit wela = P2^7;
sbit dula = P2^6;
sbit FM = P2^3;
sbit din = P2^0;
sbit cs = P2^1;
sbit clk = P2^2;
/************點陣LED顯示取模編碼表***********************/
uchar code dis[][8] = {
{0x00,0x3E,0x02,0x02,0x3E,0x02,0x02,0x3E},//'3'
{0x00,0x3E,0x02,0x02,0x3E,0x20,0x20,0x3E},//'2'
{0x00,0x18,0x38,0x08,0x08,0x08,0x08,0x3E},//'1'
{0x00,0x3C,0x24,0x24,0x24,0x24,0x24,0x3C},//'0'
{0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00}//關閉顯示
};
/*****************數碼管顯示編碼表***************************/
uchar code table[] = {
0x3F, //"0"
0x06, //"1"
0x5B, //"2"
0x4F, //"3"
0x66, //"4"
0x6D, //"5"
0x7D, //"6"
0x07, //"7"
0x7F, //"8"
0x6F //"9"
};
uchar shi = 0, fen = 0, miao = 0, counter = 0, flag = 0, j = 0;
/*************點陣LED-MAX7219***********/
/***************寫字節************************/
void write_byte(uchar date)
{
uchar i = 0;
cs = 0;
for(i = 0; i < 8; i++)
{
clk = 0;
din = date & 0x80;
date <<= 1;
clk = 1;
}
}
/*****************寫MAX7219**********************/
void write_max7219(uchar add, uchar date)
{
cs = 0;
write_byte(add);
write_byte(date);
cs = 1;
}
/*****************MAX7219初始化**********************/
void max7219_init()
{
write_max7219(0x0c, 0x01);
write_max7219(0x09, 0x00);
write_max7219(0x0a, 0x08);
write_max7219(0x0b, 0x07);
write_max7219(0x0f, 0x00);
}
/*********延時*********/
void delayms(uint xms)
{
uint x, y;
for(x = xms; x > 0; x--)
for(y = 110; y > 0; y--);
}
/************串口和定時器T0初始化********************/
void init()
{
TMOD = 0x21;//T1工作方式2，T0工作方式1
TH0 = 0xB8;
TL0 = 0x00;
TH1 = 0xFA;
TL1 = 0xFA;
TR1 = 1;
SM0 = 0;
SM1 = 1;
REN = 1;
EA = 1;
ES = 1;
ET0 = 1;
}
/*************數碼管顯示時間************************/'
void display(uchar shi, uchar fen, uchar miao)
{
uchar shi_s, shi_g;
uchar fen_s, fen_g;
uchar miao_s, miao_g;
shi_s = shi / 10 % 10;
shi_g = shi % 10;
fen_s = fen / 10 % 10;
fen_g = fen % 10;
miao_s = miao / 10 % 10;
miao_g = miao % 10;
dula = 1;
P0 = table[shi_s];
dula = 0;
P0 = 0xff;
wela = 1;
P0 = 0xfe;
wela = 0;
P0 = 0x00;
delayms(1);
dula = 1;
P0 = table[shi_g];
dula = 0;
P0 = 0xff;
wela = 1;
P0 = 0xfd;
wela = 0;
P0 = 0x00;
delayms(1);
dula = 1;
P0 = table[fen_s];
dula = 0;
P0 = 0xff;
wela = 1;
P0 = 0xfb;
wela = 0;
P0 = 0x00;
delayms(1);
dula = 1;
P0 = table[fen_g];
dula = 0;
P0 = 0xff;
wela = 1;
P0 = 0xf7;
wela = 0;
P0 = 0x00;
delayms(1);
dula = 1;
P0 = table[miao_s];
dula = 0;
P0 = 0xff;
wela = 1;
P0 = 0xef;
wela = 0;
P0 = 0x00;
delayms(1);
dula = 1;
P0 = table[miao_g];
dula = 0;
P0 = 0xff;
wela = 1;
P0 = 0xdf;
wela = 0;
P0 = 0x00;
delayms(1);
}
/*****************點陣顯示程序****************/
void display_max7219()
{
uchar m, n;
for(m = 0; m < 5; m++)
{
for(n = 0; n < 8; n++)
{
write_max7219(n+1, dis[m][n]);
delayms(1);
}
delayms(1000);
}
TR0 = 1;
}
/****************主程序********************/
void main(void)
{
init();
max7219_init();
display_max7219();
while(1)
{
display(shi, fen, miao);
if(flag == 1)
{
flag = 0;
ES = 0;
SBUF = shi;
while(!TI);
TI = 0;
SBUF = fen;
while(!TI);
TI = 0;
SBUF = miao;
while(!TI);
TI = 0;
ES = 1;
}
}
}
/***************定時器T0中斷程序**********************/
void timer0_int() interrupt 1
{
TH0 = 0xB8;
TL0 = 0x00;
counter++;
P1 = ~(1 << j++);
if(j >= 8)
{
j = 0;
}
if(counter == 50)
{
counter = 0;
miao++;
if(miao >= 60)
{
miao = 0;
fen++;
if(fen >= 60)
{
fen = 0;
shi++;
if(shi >= 24)
{
shi = 0;
}
}
}
}
}
/*************串口中斷服務程序***********************/
void uart_int() interrupt 4
{
RI = 0;
if(SBUF >= 23 && SBUF <= 59)
{
fen = SBUF;
miao = 0;
FM = 0;
delayms(30);
FM = 1;
}
if(SBUF >= 0 && SBUF <= 23)
{
shi = SBUF;
fen = SBUF;
FM = 0;
delayms(30);
FM = 1;
}
flag = 1;
}