877a驱动max7219驱动4块8*8级联成4*32，显示时在第三块总是有残影，另外3块确没有，请问是代码问题吗？谢谢了！
单片机源程序如下:
- #include <pic.h>
- __CONFIG(HS&WDTDIS&LVPDIS);
- #define INT8U unsigned char
- #define _XTAL_FREQ 4000000UL
- //定义Max7219端口
- #define DIN RB0
- #define CS RB1
- #define CLK RB2
- const INT8U disp1[10][8]={
- {0x3C,0x42,0x42,0x42,0x42,0x42,0x42,0x3C},//0
- {0x18,0x28,0x08,0x08,0x08,0x08,0x08,0x08},//1
- {0x3c,0x42,0x42,0x02,0x1c,0x20,0x40,0x7E},//2
- {0x3c,0x42,0x42,0x0c,0x2,0x42,0x42,0x3c},//3
- {0x28,0x28,0x48,0x48,0x7e,0x8,0x8,0x8},//4
- {0x3e,0x40,0x40,0x7c,0x2,0x2,0x42,0x3c},//5
- {0x3e,0x42,0x40,0x7C,0x42,0x42,0x42,0x3c},//6
- {0x7E,0x02,0x4,0x8,0x8,0x8,0x8,0x8},//7
- {0x3c,0x42,0x42,0x3c,0x42,0x42,0x42,0x3c},//8
- {0x3c,0x42,0x42,0x42,0x3e,0x2,0x42,0x3c}//9
- };
- //-----------------------------------------------------------------------------
- //向MAX7219写入字节
- //-----------------------------------------------------------------------------
- void Write_Max7219_byte(INT8U DATA)
- {
- INT8U i;
- CS=0; //CS=0有效,CS=1锁存
- for(i=8;i>=1;i--)
- {
- CLK=0;
- if(DATA & 0x80) DIN=1; else DIN=0;
- //DIN=(DATA&0x80); //&10000000, 编译器对位操作的理解:非0即为1
- DATA=DATA<<1;
- CLK=1; //上升沿把数据送出去
- }
- }
- //------------------------------------------------------------------
- //向M第一片MAX7219写入数据
- //------------------------------------------------------------------
- void Write_Max7219_1(INT8U add1,INT8U dat1)
- {
- CS=0;
- Write_Max7219_byte(add1); //写入地址，即数码管编号
- Write_Max7219_byte(dat1); //写入数据，即数码管显示数字
- CS=1;
- }
- //---------------------------------------------------------------------
- //第二片MAX7219的写入数据
- //---------------------------------------------------------------------
- void Write_Max7219_2(INT8U add2,INT8U dat2)
- {
- CS=0;
- Write_Max7219_byte(add2);
- Write_Max7219_byte(dat2);
- CLK=1;
- Write_Max7219_byte(0x00); //片1写入空
- Write_Max7219_byte(0x00);
- CS=1;
- }
- //---------------------------------------------------------------------
- //第三片MAX7219的写入数据
- //---------------------------------------------------------------------
- void Write_Max7219_3(INT8U add3,INT8U dat3)
- {
- CS=0;
- Write_Max7219_byte(add3);
- Write_Max7219_byte(dat3);
- CLK=1;
- Write_Max7219_byte(0x00); //片1写入空
- Write_Max7219_byte(0x00);
- Write_Max7219_byte(0x00); //片2写入空
- Write_Max7219_byte(0x00);
- CS=1;
- }
- //---------------------------------------------------------------------
- //第四片MAX7219的写入数据
- //---------------------------------------------------------------------
- void Write_Max7219_4(INT8U add4,INT8U dat4)
- {
- CS=0;
- Write_Max7219_byte(add4);
- Write_Max7219_byte(dat4);
- CLK=1;
- Write_Max7219_byte(0x00); //片1写入空
- Write_Max7219_byte(0x00);
- Write_Max7219_byte(0x00); //片2写入空
- Write_Max7219_byte(0x00);
- Write_Max7219_byte(0x00); //片3写入空
- Write_Max7219_byte(0x00);
- CS=1;
- }
- //---------------------------------------------------------------------
- //初始化芯片
- //---------------------------------------------------------------------
- void Init_MAX7219(void)
- {
- Write_Max7219_1(0x09, 0x00); //译码方式：不译码
- Write_Max7219_1(0x0a, 0x00); //亮度最小
- Write_Max7219_1(0x0b, 0x07); //扫描界限；8个数码管显示
- Write_Max7219_1(0x0c, 0x01); //掉电模式：0，普通模式：1
- Write_Max7219_1(0x0f, 0x00); //显示测试：1；测试结束，正常显示：0
- Write_Max7219_2(0x09, 0x00); //译码方式：不译码
- Write_Max7219_2(0x0a, 0x00); //亮度最小
- Write_Max7219_2(0x0b, 0x07); //扫描界限；8个数码管显示
- Write_Max7219_2(0x0c, 0x01); //掉电模式：0，普通模式：1
- Write_Max7219_2(0x0f, 0x00); //显示测试：1；测试结束，正常显示：0
- Write_Max7219_3(0x09, 0x00); //译码方式：不译码
- Write_Max7219_3(0x0a, 0x00); //亮度最小
- Write_Max7219_3(0x0b, 0x07); //扫描界限；8个数码管显示
- Write_Max7219_3(0x0c, 0x01); //掉电模式：0，普通模式：1
- Write_Max7219_3(0x0f, 0x00); //显示测试：1；测试结束，正常显示：0
-
- Write_Max7219_4(0x09, 0x00); //译码方式：不译码
- Write_Max7219_4(0x0a, 0x00); //亮度最小
- Write_Max7219_4(0x0b, 0x07); //扫描界限；8个数码管显示
- Write_Max7219_4(0x0c, 0x01); //掉电模式：0，普通模式：1
- Write_Max7219_4(0x0f, 0x00); //显示测试：1；测试结束，正常显示：
- }
-
- //---------------------------------------------------------------------
- //*********************主程序**************************
- //---------------------------------------------------------------------
- void main(void)
- {
- INT8U i,j=0,k=0;;
- TRISB=0;
- PORTB=0x00;
-
- __delay_ms(50);
- Init_MAX7219();
-
- while(1)
- {
- for(i=1;i<9;i++)
- {
- Write_Max7219_1(i,disp1[j%10][i-1]);
- Write_Max7219_2(i,disp1[j/10%10][i-1]);
- Write_Max7219_3(i,disp1[j/100%10][i-1]);
- Write_Max7219_4(i,disp1[k][i-1]);
- }
- j+=1;
- if(j>254)
- {
- j=0;k+=1;
- if(k>9) k=0;
- }
- __delay_ms(300);
- }
- }
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