#include <reg52.h>
sbit ADDR0 = P1^0;
sbit ADDR1 = P1^1;
sbit ADDR2 = P1^2;
sbit ADDR3 = P1^3;
sbit ENLED = P1^4;
unsigned char code image[] = { //圖片的字模表
0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,
0x7D,0x01,0x01,0x7D,0xFF,0xFF,0xE3,0xC1,
0x81,0x03,0x03,0x81,0xC1,0xE3,0xFF,0xFF,
0x81,0x01,0x3F,0x3F,0x3F,0x01,0x81,0xFF,
0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF
};
void main()
{
EA = 1; //使能總中斷
ENLED = 0; //使能U4，選擇LED點陣
ADDR3 = 0;
TMOD = 0x01; //設置T0為模式1
TH0 = 0xFC; //為T0賦初值0xFC67，定時1ms
TL0 = 0x67;
ET0 = 1; //使能T0中斷
TR0 = 1; //啟動T0
while (1);
}
/* 定時器0中斷服務函數 */
void InterruptTimer0() interrupt 1
{
static unsigned char i = 0; //動態掃描的索引
static unsigned char tmr = 0; //250ms軟件定時器
static unsigned char index = 0; //圖片刷新索引
TH0 = 0xFC; //重新加載初值
TL0 = 0x67;
//以下代碼完成LED點陣動態掃描刷新
P0 = 0xFF; //顯示消隱
switch (i)
{
case 0: ADDR2=0; ADDR1=0; ADDR0=0; i++; P0=image[index+0]; break;
case 1: ADDR2=0; ADDR1=0; ADDR0=1; i++; P0=image[index+1]; break;
case 2: ADDR2=0; ADDR1=1; ADDR0=0; i++; P0=image[index+2]; break;
case 3: ADDR2=0; ADDR1=1; ADDR0=1; i++; P0=image[index+3]; break;
case 4: ADDR2=1; ADDR1=0; ADDR0=0; i++; P0=image[index+4]; break;
case 5: ADDR2=1; ADDR1=0; ADDR0=1; i++; P0=image[index+5]; break;
case 6: ADDR2=1; ADDR1=1; ADDR0=0; i++; P0=image[index+6]; break;
case 7: ADDR2=1; ADDR1=1; ADDR0=1; i=0; P0=image[index+7]; break;
default: break;
}
//以下代碼完成每250ms改變一幀圖像
tmr++;
if (tmr >= 250) //達到250ms時改變一次圖片索引
{
tmr = 0;
index++;
if (index >= 32) //圖片索引達到32后歸零
{
index = 0;
}
} |
