开发板led点阵模块电路图如下:
74HC595:74HC595是一个8位串行输入、并行输出的位移缓存器。芯片第11角为数据输入时钟线,上升沿有效。芯片第12脚为输出存储器锁存时钟线,上升沿有效。芯片第13脚为输出有效(低电平)。芯片第14脚为串行数据输入。
为表示出输入74HC595的8位二进制数,开发板加入了led模块(图一中绿色所示)。若要使led发光,则需将JP595接vcc。
OE为输出有效控制端,低电平有效,所以务必将JOE短接片短接到GND端。
_nop_();函数为延时一个机器周期,所对应头文件为intrins.h
#include《reg52.h》#include《intrins.h》#defineucunsignedcharsbitsrclk=P3^6;sbitrclk=P3^5;sbitser=P3^4;voidc74hc595(ucdat){uci;srclk=rclk=0;for(i=1;i《=8;i++){ser=dat》》7;dat《《=1;srclk=1;_nop_();srclk=0;}rclk=1;_nop_();rclk=0;}voidmain(){c74hc595(0x80);P0=0x7f;while(1);}
下面是电路图:
/*名称:8X8LED点阵显示数字
说明:1.8X8LED点阵屏循环显示数字0~9,刷新过程为动态变换完成。
2.行扫描为XX,接P1口,列扫描为YY,接P3口
*/
#include《reg51.h》
#include《intrins.h》
#defineucharunsignedchar
#defineuintunsignedint
ucharcodeXX[]=
{
0x00,0x3e,0x41,0x41,0x41,0x3e,0x00,0x00,//0
0x00,0x00,0x00,0x21,0x7f,0x01,0x00,0x00,//1
0x00,0x27,0x45,0x45,0x45,0x39,0x00,0x00,//2
0x00,0x22,0x49,0x49,0x49,0x36,0x00,0x00,//3
0x00,0x0c,0x14,0x24,0x7f,0x04,0x00,0x00,//4
0x00,0x72,0x51,0x51,0x51,0x4e,0x00,0x00,//5
0x00,0x3e,0x49,0x49,0x49,0x26,0x00,0x00,//6
0x00,0x40,0x40,0x40,0x4f,0x70,0x00,0x00,//7
0x00,0x36,0x49,0x49,0x49,0x36,0x00,0x00,//8
0x00,0x32,0x49,0x49,0x49,0x3e,0x00,0x00//9
};
ucharcodeYY[]={0x01,0x02,0x04,0x08,0x10,0x20,0x40,0x80};
uchari,k,j,t=0,Num_Index;
voidyanchi(ucharms)
{
while(ms--)
{
for(i=0;i《100;i++);
}
}
//主程序
voidmain()
{
while(1)
{
for(t=0;t《10;t++)
{
for(j=0;j《50;j++)
{
for(k=0;k《8;k++)
{
P1=YY[k];
P3=~XX[t*8+k];
yanchi(2);
}
}//**************************0
}
}
}
/*******************************************************************************************/
#include《reg51.h》
#include《intrins.h》
#defineucharunsignedchar
#defineuintunsignedint
ucharcodeXX[]=
{
0x00,0x3e,0x41,0x41,0x41,0x3e,0x00,0x00,//0
0x00,0x00,0x00,0x21,0x7f,0x01,0x00,0x00,//1
0x00,0x21,0x43,0x45,0x49,0x31,0x00,0x00,//2
0x00,0x22,0x49,0x49,0x49,0x36,0x00,0x00,//3
0x00,0x0c,0x14,0x24,0x7f,0x04,0x00,0x00,//4
0x00,0x72,0x51,0x51,0x51,0x4e,0x00,0x00,//5
0x00,0x3e,0x49,0x49,0x49,0x26,0x00,0x00,//6
0x00,0x40,0x40,0x4f,0x50,0x60,0x00,0x00,//7
0x00,0x36,0x49,0x49,0x49,0x36,0x00,0x00,//8
0x00,0x32,0x49,0x49,0x49,0x3e,0x00,0x00//9
};
ucharcodeYY[]={0x01,0x02,0x04,0x08,0x10,0x20,0x40,0x80};
uinTI,k,j,t;
voidyanchi(ucharms)
{
while(ms--)
{
for(i=0;i《100;i++);
}
}
//主程序
voidmain()
{
while(1)
{
for(t=0;t《200;t++)
{
for(j=0;j《20;j++)
{
for(k=0;k《8;k++)
{
P1=YY[k];
P2=~XX[(t%10)*8+k];
P3=~XX[((t%100)/10)*8+k];
P0=~XX[(t/100)*8+k];
yanchi(2);
}
}//**************************0
}
}
}
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