?? main.c
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/*
main.c
16×16 LED點陣的掃描顯示:顯示一個漢字
*/
#include <reg51.h>
//定義I/O端口
sbit STR = P1^3; //74HC595存儲寄存器時鐘(Storage register clock)
sbit SI = P1^4; //74HC595串行輸入信號(Serial Input)
sbit SCK = P1^5; //74HC595移位寄存器時鐘(Shift register clock)
//定義漢字點陣數據表
code unsigned char Zimo[32] =
{
//文字:漢,字體:Fixedsys12,大小:16×16,取模方式:縱向取模、字節正序
0x08,0x06,0x80,0x61,0x06,0x20,0x38,0x27,0x20,0x20,0x20,0x27,0x38,0x20,0x00,0x00,
0x20,0x20,0x7E,0x80,0x02,0x04,0x04,0x08,0xD0,0x20,0xD0,0x08,0x0C,0x06,0x04,0x00
};
/*
函數:SysInit()
功能:系統初始化
*/
void SysInit()
{
STR = 1;
SI = 0;
SCK = 0;
TMOD &= 0x0F;
TMOD |= 0x10;
TH1 = 0xFC;
TL1 = 0x66;
TR1 = 1;
ET1 = 1;
EA = 1;
}
/*
函數:T1INTSVC()
功能:T1中斷服務函數
*/
void T1INTSVC() interrupt 3
{
code unsigned char Tab[] =
{//定義掃描數據表
0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0x7F,0xBF,0xDF,0xEF,0xF7,0xFB,0xFD,0xFE,
0x7F,0xBF,0xDF,0xEF,0xF7,0xFB,0xFD,0xFE,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF
};
static unsigned char n = 0; //局部靜態變量,用于查表
unsigned char d; //臨時變量
unsigned char i; //循環變量
unsigned char j; //循環變量
unsigned char buf[4]; //臨時數組,用于向74HC595發送數據
//處理定時器T1
TR1 = 0;
TH1 = 0xFC;
TL1 = 0x66;
TR1 = 1;
//查表,取得要發送的數據
buf[0] = Tab[n];
buf[1] = Tab[16+n];
buf[2] = Zimo[16+n];
buf[3] = Zimo[n];
n++;
n &= 0x0F;
//向74HC595發送數據
STR = 0;
for ( i=0; i<4; i++ )
{
d = buf[i];
j = 8;
do
{
SI = (bit)(d & 0x01);
SCK = 1;
d >>= 1;
SCK = 0;
} while ( --j != 0 );
}
STR = 1;
}
void main()
{
SysInit();
for (;;);
}
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