关于单片机MAX7219控制点阵屏鬼影闪烁的问题有没有遇到过的 -

标题: 关于单片机MAX7219控制点阵屏鬼影闪烁的问题有没有遇到过的 [打印本页]

作者: egsresrhtrhrtst 时间: 2022-1-8 01:51
标题: 关于单片机MAX7219控制点阵屏鬼影闪烁的问题有没有遇到过的

如图，总有F的鬼影

单片机源程序如下:
#include<reg52.h>
#include<intrins.h>
#define uchar unsigned char
#define uint unsigned int

sbit din=P2^2;
sbit cs =P2^1;
sbit clk=P2^0;

#define liangdu 0xff;

uchar code table[38][8]={
{0x3C,0x42,0x42,0x42,0x42,0x42,0x42,0x3C},//0
{0x08,0x18,0x28,0x08,0x08,0x08,0x08,0x08},//1
{0x7E,0x02,0x02,0x7E,0x40,0x40,0x40,0x7E},//2
{0x3E,0x02,0x02,0x3E,0x02,0x02,0x3E,0x00},//3
{0x08,0x18,0x28,0x48,0xFE,0x08,0x08,0x08},//4
{0x3C,0x20,0x20,0x3C,0x04,0x04,0x3C,0x00},//5
{0x3C,0x20,0x20,0x3C,0x24,0x24,0x3C,0x00},//6
{0x3E,0x22,0x04,0x08,0x08,0x08,0x08,0x08},//7
{0x00,0x3E,0x22,0x22,0x3E,0x22,0x22,0x3E},//8
{0x3E,0x22,0x22,0x3E,0x02,0x02,0x02,0x3E},//9
{0x08,0x14,0x22,0x3E,0x22,0x22,0x22,0x22},//A       10
{0x3C,0x22,0x22,0x3E,0x22,0x22,0x3C,0x00},//B       11
{0x3C,0x40,0x40,0x40,0x40,0x40,0x3C,0x00},//C       12
{0x7C,0x42,0x42,0x42,0x42,0x42,0x7C,0x00},//D       13
{0x7C,0x40,0x40,0x7C,0x40,0x40,0x40,0x7C},//E       14
{0x7C,0x40,0x40,0x7C,0x40,0x40,0x40,0x40},//F       15
{0x3C,0x40,0x40,0x40,0x40,0x44,0x44,0x3C},//G       16
{0x44,0x44,0x44,0x7C,0x44,0x44,0x44,0x44},//H       17
{0x7C,0x10,0x10,0x10,0x10,0x10,0x10,0x7C},//I       18
{0x3C,0x08,0x08,0x08,0x08,0x08,0x48,0x30},//J       19
{0x00,0x24,0x28,0x30,0x20,0x30,0x28,0x24},//K       20
{0x40,0x40,0x40,0x40,0x40,0x40,0x40,0x7C},//L       21
{0x81,0xC3,0xA5,0x99,0x81,0x81,0x81,0x81},//M       22
{0x00,0x42,0x62,0x52,0x4A,0x46,0x42,0x00},//N       23
{0x3C,0x42,0x42,0x42,0x42,0x42,0x42,0x3C},//O       24
{0x3C,0x22,0x22,0x22,0x3C,0x20,0x20,0x20},//P       25
{0x1C,0x22,0x22,0x22,0x22,0x26,0x22,0x1D},//Q       26
{0x3C,0x22,0x22,0x22,0x3C,0x24,0x22,0x21},//R       27
{0x00,0x1E,0x20,0x20,0x3E,0x02,0x02,0x3C},//S       28
{0x00,0x3E,0x08,0x08,0x08,0x08,0x08,0x08},//T       29
{0x42,0x42,0x42,0x42,0x42,0x42,0x22,0x1C},//U       30
{0x42,0x42,0x42,0x42,0x42,0x42,0x24,0x18},//V       31
{0x00,0x49,0x49,0x49,0x49,0x2A,0x1C,0x00},//W       32
{0x00,0x41,0x22,0x14,0x08,0x14,0x22,0x41},//X       33
{0x41,0x22,0x14,0x08,0x08,0x08,0x08,0x08},//Y       34
{0x00,0x7F,0x02,0x04,0x08,0x10,0x20,0x7F},//Z       35
{0x08,0x7F,0x49,0x49,0x7F,0x08,0x08,0x08},//中       36
{0xFE,0xBA,0x92,0xBA,0x92,0x9A,0xBA,0xFE},//国       37
};

void delay(uint xms)
{
      uint i,j;
      for(i=xms;i>0;i--)
            for(j=112;j>0;j--);
}

void write_7219_byte(uchar Data)                                     //为什么DATA要大写？
{
      uchar i;
      for(i=0;i<8;i++)
      {
            clk=0;
            din=Data&0x80;
            Data=Data<<1;
            clk=1;
      }
}

void write_7219_shuju1(uchar add1,uchar dat1)
{
      cs=0;
      write_7219_byte(add1);
      write_7219_byte(dat1);
      cs=1;
}
void write_7219_shuju2(uchar add2,uchar dat2)
{
      cs=0;
      write_7219_byte(add2);
      write_7219_byte(dat2);
      write_7219_byte(0x00);
      write_7219_byte(0x00);
      cs=1;
}
void write_7219_shuju3(uchar add3,uchar dat3)
{
      cs=0;
      write_7219_byte(add3);
      write_7219_byte(dat3);
      write_7219_byte(0x00);
      write_7219_byte(0x00);
      write_7219_byte(0x00);
      write_7219_byte(0x00);
      cs=1;
}
void write_7219_shuju4(uchar add4,uchar dat4)
{
      cs=0;
      write_7219_byte(add4);
      write_7219_byte(dat4);
      write_7219_byte(0x00);
      write_7219_byte(0x00);
      write_7219_byte(0x00);
      write_7219_byte(0x00);
      write_7219_byte(0x00);
      write_7219_byte(0x00);
      cs=1;
}
void write_7219_shuju5(uchar add5,uchar dat5)
{
      cs=0;
      write_7219_byte(add5);
      write_7219_byte(dat5);
      write_7219_byte(0x00);
      write_7219_byte(0x00);
      write_7219_byte(0x00);
      write_7219_byte(0x00);
      write_7219_byte(0x00);
      write_7219_byte(0x00);
      write_7219_byte(0x00);
      write_7219_byte(0x00);
      cs=1;
}

void init()
{
      write_7219_shuju1(0x0a,0xff);
      write_7219_shuju1(0x0b,0x07);
      write_7219_shuju1(0x0c,0x01);
      write_7219_shuju1(0x0f,0x00);
      write_7219_shuju1(0x09,0x00);

      write_7219_shuju2(0x0a,0xff);
      write_7219_shuju2(0x0b,0x07);
      write_7219_shuju2(0x0c,0x01);
      write_7219_shuju2(0x0f,0x00);
      write_7219_shuju2(0x09,0x00);

      write_7219_shuju3(0x0a,0xff);
      write_7219_shuju3(0x0b,0x07);
      write_7219_shuju3(0x0c,0x01);
      write_7219_shuju3(0x0f,0x00);
      write_7219_shuju3(0x09,0x00);

      write_7219_shuju4(0x0a,0xff);
      write_7219_shuju4(0x0b,0x07);
      write_7219_shuju4(0x0c,0x01);
      write_7219_shuju4(0x0f,0x00);
      write_7219_shuju4(0x09,0x00);

      write_7219_shuju5(0x0a,0xff);
      write_7219_shuju5(0x0b,0x07);
      write_7219_shuju5(0x0c,0x01);
      write_7219_shuju5(0x0f,0x00);
      write_7219_shuju5(0x09,0x00);
}
void main()
{
      while(1)
      {
      write_7219_shuju1(1,table[15][0]);
      write_7219_shuju1(2,table[15][1]);
      write_7219_shuju1(3,table[15][2]);
      write_7219_shuju1(4,table[15][3]);
      write_7219_shuju1(5,table[15][4]);
      write_7219_shuju1(6,table[15][5]);
      write_7219_shuju1(7,table[15][6]);
      write_7219_shuju1(8,table[15][7]);

      write_7219_shuju2(1,table[21][0]);
      write_7219_shuju2(2,table[21][1]);
      write_7219_shuju2(3,table[21][2]);
      write_7219_shuju2(4,table[21][3]);
      write_7219_shuju2(5,table[21][4]);
      write_7219_shuju2(6,table[21][5]);
      write_7219_shuju2(7,table[21][6]);
      write_7219_shuju2(8,table[21][7]);

      write_7219_shuju3(0x0c,0x01);
      write_7219_shuju3(1,table[1][0]);
      write_7219_shuju3(2,table[1][1]);
      write_7219_shuju3(3,table[1][2]);
      write_7219_shuju3(4,table[1][3]);
      write_7219_shuju3(5,table[1][4]);
      write_7219_shuju3(6,table[1][5]);
      write_7219_shuju3(7,table[1][6]);
      write_7219_shuju3(8,table[1][7]);


      write_7219_shuju4(1,table[28][0]);
      write_7219_shuju4(2,table[28][1]);
      write_7219_shuju4(3,table[28][2]);
      write_7219_shuju4(4,table[28][3]);
      write_7219_shuju4(5,table[28][4]);
      write_7219_shuju4(6,table[28][5]);
      write_7219_shuju4(7,table[28][6]);
      write_7219_shuju4(8,table[28][7]);


      write_7219_shuju5(1,table[32][0]);
      write_7219_shuju5(2,table[32][1]);
      write_7219_shuju5(3,table[32][2]);
      write_7219_shuju5(4,table[32][3]);
      write_7219_shuju5(5,table[32][4]);
      write_7219_shuju5(6,table[32][5]);
      write_7219_shuju5(7,table[32][6]);
      write_7219_shuju5(8,table[32][7]);
      delay(1000);
      }

}

作者: andyhallo 时间: 2022-1-8 10:02
这个算法的效率太低了可以参考论坛某个帖子里面的程序很简洁

作者: 1729924651 时间: 2022-1-8 10:48
消影时间不够吧

作者: 188610329 时间: 2022-1-8 13:41
MAX7219, 是显示驱动器。
他只需要你把点阵数据发给他，他就会自动显示，换句话说，你数据不发生变化的前提下，是不需要，也不应该去反复的刷 7219的，
所以，你在while(1) 里面不停的发是什么鬼？你只要去掉while(1),把它放在main的结尾， while(1); 就不会有那所谓的“鬼影”。

然后顺带说一下，那所谓的“鬼影”，就是你在发送数据一的时候，后面莫名其妙增加的那些数据，发送数据二的时候，被正确的数据覆盖，所以只显示一小会儿，就成了所谓的鬼影，换言之你的这种数据发送方法是有问题的。

作者: egsresrhtrhrtst 时间: 2022-1-8 16:25
本帖最后由 egsresrhtrhrtst 于 2022-1-8 16:27 编辑

188610329 发表于 2022-1-8 13:41
MAX7219, 是显示驱动器。
他只需要你把点阵数据发给他，他就会自动显示，换句话说，你数据不发生变化的前 ...

谢谢，把while放到后边确实没有了，这是我参考论坛里的动态显示的程序改的，想着静态显示一下，弄了好久都不行，你说的莫名其妙的程序是说的write_7219_byte(0x00);;这些发送空值得程序吗，这些不是要传送的嘛。

作者: 188610329 时间: 2022-1-8 19:08

egsresrhtrhrtst 发表于 2022-1-8 16:25
谢谢，把while放到后边确实没有了，这是我参考论坛里的动态显示的程序改的，想着静态显示一下，弄了好久 ...

你最好，好好看看手册，究竟需要发些什么，你上面的代码，很多操作都是无意义的。

初始化，定义亮度，这些都是只需要做一次的，然后就是定义每一个位的亮灭，当你显示不需要变化的时候，就不用再操作7219，产生变化的时候，其实也只需要更新发生变化的地址的数据而已。而不是所有的地址数据全都更新

作者: egsresrhtrhrtst 时间: 2022-1-8 20:02

188610329 发表于 2022-1-8 19:08
你最好，好好看看手册，究竟需要发些什么，你上面的代码，很多操作都是无意义的。

初始化，定义亮度 ...

好的。谢谢了

作者: 123456ZXC1 时间: 2022-1-9 13:46
建议多看看数据手册

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