利用8X8 点阵挨个显示数字0 到9 的数字,到9后从0重新开始,如此循环。
解决方式一:通过中断方式让所有行值始终为低电平(事实上,并不是一次性让所有行值为低电平,而是挨行设置,CPU的中断时间间隔较短,当挨行设置频率较快时,可近似认为所有行值都为低电平),而列值需要根据具体数字的列值来确定,每秒改一次列值的数字。
解决方式二:通过中断方式让所有列值始终为高电平(原理同上),而行值根据具体数字的行值来确定,每秒改变一次行值的数字
以下我采用了方法一来实现。
编译环境:KEIL C51 V3
电路仿真软件:proteus 7.4
单片机类型:AT89C52
LED类型:MATRIX-8X8-RED
单片机上的程序代码:
#include
unsigned char code table1[]={0xfe,0xfd,0xfb,0xf7,0xef,0xdf,0xbf,0x7f};
//unsigned char code table2[]={0x01,0x02,0x04,0x08,0x10,0x20,0x40,0x80};
unsigned char code table2[10][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
};
unsigned int times_of_interrupt;
unsigned char i,j;
void main()
{
TMOD=0x01; //定时器/计数器工作方式为16位定时/计数器
//给定时器/计数器T0装入预定初值
TH0=(65535-60000)/256;
TL0=(65535-60000)/256;
TR0=1; //设置定时器/计数器T0为定时器状态
ET0=1; //打开定时器ET0中断允许标志位
EA=1; //打开CPU中断允许标志位
times_of_interrupt=0;
i=0;
j=0;
while(1)
{}
}
void t0_interrupt_function() interrupt 1
{
P2=table1[i];
P1=table2[j][i];
i++;
if(i==8)
{
i=0;
}
if(times_of_interrupt==40)
{
times_of_interrupt=1;
j++;
if(j==10)
{
j=0;
}
}
else
{
times_of_interrupt=times_of_interrupt+1;
}
}
电路图核心部分如下:
显示效果如下:
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