Development
Newbie level 2
Hello All,
I am using 8051 and shift register for led matrix scrolling, at start I want scroll two characters in 8*8 matrix.
However, I could not manage the gap between these characters, My one character scroll complete and then second character start...
And if i put both characters in single array, they get overlap...
Could anyone help me for the solution...
Below is my code and attach is circuit diagram for the same.
I am using 8051 and shift register for led matrix scrolling, at start I want scroll two characters in 8*8 matrix.
However, I could not manage the gap between these characters, My one character scroll complete and then second character start...
And if i put both characters in single array, they get overlap...
Could anyone help me for the solution...
Below is my code and attach is circuit diagram for the same.
Code C - [expand] 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 #include <reg51.h> char row[8]={0x80,0x40,0x20,0x10,0x08,0x04,0x02,0x01}; char colp[8]={0x00,0x0f,0x09,0x09,0x0f,0x08,0x08,0x00}; // to print P char cola[8]={0x00,0x06,0x09,0x09,0x0f,0x09,0x09,0x00}; // to print A sbit SH_CP = P2^0; sbit DS = P2^1; sbit ST_CP = P2^2; void delay_us(unsigned int us_count); void pulse(char pin); void SIPO(unsigned char byte); void init(void); void delay_us(unsigned int us_count) { us_count = us_count; while(us_count!=0) { us_count--; } } void pulse(char pin) { if(pin=='S') { SH_CP=0; delay_us(1); SH_CP= 1; } else if(pin=='R') { ST_CP=1; delay_us(1); ST_CP= 0; } } void SIPO(unsigned int byte) { unsigned int Mask = 0x0001, t, Flag; for (t=0; t<12; t++) { Flag = byte & Mask; if(Flag==0) { DS = 0; } else { DS = 1; } SH_CP = 1; SH_CP = 0; Mask = Mask << 1; } ST_CP = 1; ST_CP = 0; } void init(void){ DS=0; SH_CP=0; ST_CP=0; } void delay(unsigned int a) { unsigned int i,j; for(i=0;i<a;i++) for(j=0;j<1000;j++); } void main() { unsigned int i=0,j,k=0,l,x,y,z=0,u,a=0; P2=0x00; P3=0x00; init(); while(1) { a=0; for(l=0;l<12;l++) { for(j=0;j<24;j++) { for(k=0;k<8;k++) { if(i==8) { i=0; } P3=row[i]; // column //SIPO(0x01<<l); SIPO(cola[k]<<l); pulse('R'); // row //delay(1); SIPO(0x00); pulse('R'); // row // delay(1); i++; } delay(1); } if(a==0) { for(u=0; u<12; u++){ for(x=0;x<24;x++) { for(y=0;y<8;y++) { if(z==8) {z=0; } P3=row[z]; // column //SIPO(0x01<<l); SIPO(colp[y]<<u); pulse('R'); // row //delay(1); SIPO(0x00); pulse('R'); // row // delay(1); z++; } delay(1); } } } a++; } } }