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3.4 花样流水灯
在上一案例中，LED只能按某种单调的规律显示，无法实现复杂多变的花样显示。本例中两组LED连接在P0和P2端口，它们按预先设定的花样变换显示。
本例电路如图3-4所示。
程序设计调试与实训：
本例将设计的花样预设在两个数组中，它们分别与两组LED对应，各数组中的每个字节对应一种显示组合，程序循环读取数组中的显示组合并送往端口，实现自定义花样的自由显示。
本例P0、P2端口对应的花样数组所占空间较大，且预设后相对固定，因此Pattern_P0，Pattern_P2的存储类型均设为code，由于电路中LED共阳连接，初始时将P0、P2均设为0xFF，在开始时将它们全部关闭。
读者可以自行调整数组内容，改变数组大小，实现自定义的花样显示。
图3-4 花样流水灯电路
源程序代码：
//-----------------------------------------------------------------
// 名称: 花样流水灯
//-----------------------------------------------------------------
// 说明: 16只LED分两组按预设的多种花样变换显示。
//-----------------------------------------------------------------
#include <reg51.h>
#define uchar unsigned char
#define uint unsigned int
uchar code Pattern_P0[] =
{
0xFC,0xF9,0xF3,0xE7,0xCF,0x9F,0x3F,0x7F,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,
0xE7,0xDB,0xBD,0x7E,0xBD,0xDB,0xE7,0xFF,0xE7,0xC3,0x81,0x00,0x81,0xC3,0xE7,0xFF,
0xAA,0x55,0x18,0xFF,0xF0,0x0F,0x00,0xFF,0xF8,0xF1,0xE3,0xC7,0x8F,0x1F,0x3F,0x7F,
0x7F,0x3F,0x1F,0x8F,0xC7,0xE3,0xF1,0xF8,0xFF,0x00,0x00,0xFF,0xFF,0x0F,0xF0,0xFF,
0xFE,0xFD,0xFB,0xF7,0xEF,0xDF,0xBF,0x7F,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,
0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0x7F,0xBF,0xDF,0xEF,0xF7,0xFB,0xFD,0xFE,
0xFE,0xFC,0xF8,0xF0,0xE0,0xC0,0x80,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x80,0xC0,0xE0,0xF0,0xF8,0xFC,0xFE,
0x00,0xFF,0x00,0xFF,0x00,0xFF,0x00,0xFF
};
uchar code Pattern_P2[] =
{
0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFE,0xFC,0xF9,0xF3,0xE7,0xCF,0x9F,0x3F,0xFF,
0xE7,0xDB,0xBD,0x7E,0xBD,0xDB,0xE7,0xFF,0xE7,0xC3,0x81,0x00,0x81,0xC3,0xE7,0xFF,
0xAA,0x55,0x18,0xFF,0xF0,0x0F,0x00,0xFF,0xF8,0xF1,0xE3,0xC7,0x8F,0x1F,0x3F,0x7F,
0x7F,0x3F,0x1F,0x8F,0xC7,0xE3,0xF1,0xF8,0xFF,0x00,0x00,0xFF,0xFF,0x0F,0xF0,0xFF,
0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFE,0xFD,0xFB,0xF7,0xEF,0xDF,0xBF,0x7F,
0x7F,0xBF,0xDF,0xEF,0xF7,0xFB,0xFD,0xFE,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,
0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFE,0xFC,0xF8,0xF0,0xE0,0xC0,0x80,0x00,
0x00,0x80,0xC0,0xE0,0xF0,0xF8,0xFC,0xFE,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,
0x00,0xFF,0x00,0xFF,0x00,0xFF,0x00,0xFF
};
//-----------------------------------------------------------------
// 延时
//-----------------------------------------------------------------
void DelayMS(uint x)
{
uchar t;
while(x--) for(t = 0; t < 120; t++);
}
//-----------------------------------------------------------------
// 主程序
//-----------------------------------------------------------------
void main()
{
uchar i;
while(1)
{
//从数组中读取数据送至P0端口和P2端口显示
for(i = 0; i < 136; i++)
{
P0 = Pattern_P0[i];
P2 = Pattern_P2[i];
DelayMS(100);
}
}
}