/*****************************************************************************************
* *
* LED點(diǎn)陣實(shí)驗(yàn)(流動(dòng)顯示1 2 3 4 5 6 7 8 9) *
* *
* *
* *
* 說(shuō)明 通過(guò)P0 和 P2 作為點(diǎn)陣接口 *
*要求學(xué)員掌握 LED點(diǎn)陣的工作原理和 各點(diǎn)陣腳的定義及接法，具體接線請(qǐng)參考接線說(shuō)明 *
*我們采用的LED點(diǎn)陣式是低功耗，在做實(shí)驗(yàn)時(shí)可以用單片機(jī)腳直接驅(qū)動(dòng) *
******************************************************************************************/
#include<reg51.h>
unsigned char code tab[]={0x7f,0xbf,0xdf,0xef,0xf7,0xfb,0xfd,0xfe,}; //列選通控制
unsigned char code digittab[18][8]={
{0x00,0x00,0x3e,0x41,0x41,0x41,0x3e,0x00}, //0
{0x00,0x00,0x00,0x00,0x21,0x7f,0x01,0x00}, //1
{0x00,0x00,0x27,0x45,0x45,0x45,0x39,0x00}, //2
{0x00,0x00,0x22,0x49,0x49,0x49,0x36,0x00}, //3
{0x00,0x00,0x0c,0x14,0x24,0x7f,0x04,0x00}, //4
{0x00,0x00,0x72,0x51,0x51,0x51,0x4e,0x00}, //5
{0x00,0x00,0x3e,0x49,0x49,0x49,0x26,0x00}, //6
{0x00,0x00,0x40,0x40,0x40,0x4f,0x70,0x00}, //7
{0x00,0x00,0x36,0x49,0x49,0x49,0x36,0x00}, //8
{0x00,0x00,0x32,0x49,0x49,0x49,0x3e,0x00}, //9
{0x00,0x00,0x7F,0x48,0x48,0x30,0x00,0x00}, //P
{0x00,0x00,0x7F,0x48,0x4C,0x73,0x00,0x00}, //R
{0x00,0x00,0x7F,0x49,0x49,0x49,0x00,0x00}, //E
{0x00,0x00,0x3E,0x41,0x41,0x62,0x00,0x00}, //C
{0x00,0x00,0x7F,0x08,0x08,0x7F,0x00,0x00}, //H
{0x00,0x00,0x00,0xFF,0xFF,0x00,0x00,0x00}, //I
{0x00,0x7F,0x10,0x08,0x04,0x7F,0x00,0x00}, //N
{0x7C,0x48,0x48,0xFF,0x48,0x48,0x7C,0x00} //中
};
unsigned int timecount1 , timecount2; //定義的變量
unsigned char cntx , cnty ; //cntx列控制數(shù)的變量 cnty用來(lái)控制 字符與字符之間的切換
void main(void)
{
cnty=0;
while(1)
{
if(cnty<18) //紅色
{
P1=0xFF; //列選通都關(guān)閉掉
P2=tab[cntx]; // 列線
P0=digittab[cnty][cntx]; // 行線
}
else //綠色
{
P2=0xFF; //紅色的列選通都關(guān)閉掉
P1=tab[cntx]; // 列線
P0=digittab[cnty-18][cntx]; // 行線
}
//用于控制動(dòng)態(tài)掃描的速度
if(++timecount1>=50)
{
timecount1=0;
if(++cntx>=8) cntx=0;
}
//用于控制動(dòng)字符間的切換速度
if(++timecount2>=20000)
{
timecount2=0;
if(++cnty>=36)cnty=0;
}
}
}
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