877a驅動max7219驅動4塊8*8級聯成4*32,顯示時在第三塊總是有殘影,另外3塊確沒有,請問是代碼問題嗎?謝謝了!
51hei圖片_20191012204718 (2)_LI.jpg (1.17 MB, 下載次數: 50)
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51hei圖片_20191012204731 (2)_LI.jpg (1.85 MB, 下載次數: 60)
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51hei圖片_20191012204745 (2).jpg (357.75 KB, 下載次數: 64)
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單片機源程序如下:
- #include <pic.h>
- __CONFIG(HS&WDTDIS&LVPDIS);
- #define INT8U unsigned char
- #define _XTAL_FREQ 4000000UL
- //定義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寫入字節
- //-----------------------------------------------------------------------------
- void Write_Max7219_byte(INT8U DATA)
- {
- INT8U i;
- CS=0; //CS=0有效,CS=1鎖存
- for(i=8;i>=1;i--)
- {
- CLK=0;
- if(DATA & 0x80) DIN=1; else DIN=0;
- //DIN=(DATA&0x80); //&10000000, 編譯器對位操作的理解:非0即為1
- DATA=DATA<<1;
- CLK=1; //上升沿把數據送出去
- }
- }
- //------------------------------------------------------------------
- //向M第一片MAX7219寫入數據
- //------------------------------------------------------------------
- void Write_Max7219_1(INT8U add1,INT8U dat1)
- {
- CS=0;
- Write_Max7219_byte(add1); //寫入地址,即數碼管編號
- Write_Max7219_byte(dat1); //寫入數據,即數碼管顯示數字
- CS=1;
- }
- //---------------------------------------------------------------------
- //第二片MAX7219的寫入數據
- //---------------------------------------------------------------------
- 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寫入空
- Write_Max7219_byte(0x00);
- CS=1;
- }
- //---------------------------------------------------------------------
- //第三片MAX7219的寫入數據
- //---------------------------------------------------------------------
- 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寫入空
- Write_Max7219_byte(0x00);
- Write_Max7219_byte(0x00); //片2寫入空
- Write_Max7219_byte(0x00);
- CS=1;
- }
- //---------------------------------------------------------------------
- //第四片MAX7219的寫入數據
- //---------------------------------------------------------------------
- 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寫入空
- Write_Max7219_byte(0x00);
- Write_Max7219_byte(0x00); //片2寫入空
- Write_Max7219_byte(0x00);
- Write_Max7219_byte(0x00); //片3寫入空
- Write_Max7219_byte(0x00);
- CS=1;
- }
- //---------------------------------------------------------------------
- //初始化芯片
- //---------------------------------------------------------------------
- void Init_MAX7219(void)
- {
- Write_Max7219_1(0x09, 0x00); //譯碼方式:不譯碼
- Write_Max7219_1(0x0a, 0x00); //亮度最小
- Write_Max7219_1(0x0b, 0x07); //掃描界限;8個數碼管顯示
- Write_Max7219_1(0x0c, 0x01); //掉電模式:0,普通模式:1
- Write_Max7219_1(0x0f, 0x00); //顯示測試:1;測試結束,正常顯示:0
- Write_Max7219_2(0x09, 0x00); //譯碼方式:不譯碼
- Write_Max7219_2(0x0a, 0x00); //亮度最小
- Write_Max7219_2(0x0b, 0x07); //掃描界限;8個數碼管顯示
- Write_Max7219_2(0x0c, 0x01); //掉電模式:0,普通模式:1
- Write_Max7219_2(0x0f, 0x00); //顯示測試:1;測試結束,正常顯示:0
- Write_Max7219_3(0x09, 0x00); //譯碼方式:不譯碼
- Write_Max7219_3(0x0a, 0x00); //亮度最小
- Write_Max7219_3(0x0b, 0x07); //掃描界限;8個數碼管顯示
- Write_Max7219_3(0x0c, 0x01); //掉電模式:0,普通模式:1
- Write_Max7219_3(0x0f, 0x00); //顯示測試:1;測試結束,正常顯示:0
-
- Write_Max7219_4(0x09, 0x00); //譯碼方式:不譯碼
- Write_Max7219_4(0x0a, 0x00); //亮度最小
- Write_Max7219_4(0x0b, 0x07); //掃描界限;8個數碼管顯示
- Write_Max7219_4(0x0c, 0x01); //掉電模式:0,普通模式:1
- Write_Max7219_4(0x0f, 0x00); //顯示測試:1;測試結束,正常顯示:
- }
-
- //---------------------------------------------------------------------
- //*********************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);
- }
- }
復制代碼
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