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Grumble, grumble... A post vanished in an instant while I was in the process of adding a comment... thank you, Anonymous, your suggested bitmap changes have been integrated. 

/*
 * display text using a 5x7 bitmap font in ASCII letters
 */
static unsigned char font [] [5] = { 
        { 0x00,0x00,0x00,0x00,0x00 },   //   0x20 32
        { 0x00,0x00,0x6f,0x00,0x00 },   // ! 0x21 33
        { 0x00,0x07,0x00,0x07,0x00 },   // " 0x22 34
        { 0x14,0x7f,0x14,0x7f,0x14 },   // # 0x23 35
//      { 0x00,0x07,0x04,0x1e,0x00 },   // $ 0x24 36
        { 0x2e,0x2a,0xff,0x2a,0x3a },   // $ 0x24 36
        { 0x23,0x13,0x08,0x64,0x62 },   // % 0x25 37
        { 0x36,0x49,0x56,0x20,0x50 },   // & 0x26 38
        { 0x00,0x00,0x07,0x00,0x00 },   // ' 0x27 39
        { 0x00,0x1c,0x22,0x41,0x00 },   // ( 0x28 40
        { 0x00,0x41,0x22,0x1c,0x00 },   // ) 0x29 41
        { 0x14,0x08,0x3e,0x08,0x14 },   // * 0x2a 42
        { 0x08,0x08,0x3e,0x08,0x08 },   // + 0x2b 43
        { 0x00,0x50,0x30,0x00,0x00 },   // , 0x2c 44
        { 0x08,0x08,0x08,0x08,0x08 },   // - 0x2d 45
        { 0x00,0x60,0x60,0x00,0x00 },   // . 0x2e 46
        { 0x20,0x10,0x08,0x04,0x02 },   // / 0x2f 47
        { 0x3e,0x51,0x49,0x45,0x3e },   // 0 0x30 48
        { 0x00,0x42,0x7f,0x40,0x00 },   // 1 0x31 49
        { 0x42,0x61,0x51,0x49,0x46 },   // 2 0x32 50
        { 0x21,0x41,0x45,0x4b,0x31 },   // 3 0x33 51
        { 0x18,0x14,0x12,0x7f,0x10 },   // 4 0x34 52
        { 0x27,0x45,0x45,0x45,0x39 },   // 5 0x35 53
        { 0x3c,0x4a,0x49,0x49,0x30 },   // 6 0x36 54
        { 0x01,0x71,0x09,0x05,0x03 },   // 7 0x37 55
        { 0x36,0x49,0x49,0x49,0x36 },   // 8 0x38 56
        { 0x06,0x49,0x49,0x29,0x1e },   // 9 0x39 57
        { 0x00,0x36,0x36,0x00,0x00 },   // : 0x3a 58
        { 0x00,0x56,0x36,0x00,0x00 },   // ; 0x3b 59
        { 0x08,0x14,0x22,0x41,0x00 },   // < 0x3c 60
        { 0x14,0x14,0x14,0x14,0x14 },   // = 0x3d 61
        { 0x00,0x41,0x22,0x14,0x08 },   // > 0x3e 62
        { 0x02,0x01,0x51,0x09,0x06 },   // ? 0x3f 63
        { 0x3e,0x41,0x5d,0x49,0x4e },   // @ 0x40 64
        { 0x7e,0x09,0x09,0x09,0x7e },   // A 0x41 65
        { 0x7f,0x49,0x49,0x49,0x36 },   // B 0x42 66
        { 0x3e,0x41,0x41,0x41,0x22 },   // C 0x43 67
        { 0x7f,0x41,0x41,0x41,0x3e },   // D 0x44 68
        { 0x7f,0x49,0x49,0x49,0x41 },   // E 0x45 69
        { 0x7f,0x09,0x09,0x09,0x01 },   // F 0x46 70
        { 0x3e,0x41,0x49,0x49,0x7a },   // G 0x47 71
        { 0x7f,0x08,0x08,0x08,0x7f },   // H 0x48 72
        { 0x00,0x41,0x7f,0x41,0x00 },   // I 0x49 73
        { 0x20,0x40,0x41,0x3f,0x01 },   // J 0x4a 74
        { 0x7f,0x08,0x14,0x22,0x41 },   // K 0x4b 75
        { 0x7f,0x40,0x40,0x40,0x40 },   // L 0x4c 76
        { 0x7f,0x02,0x0c,0x02,0x7f },   // M 0x4d 77
        { 0x7f,0x04,0x08,0x10,0x7f },   // N 0x4e 78
        { 0x3e,0x41,0x41,0x41,0x3e },   // O 0x4f 79
        { 0x7f,0x09,0x09,0x09,0x06 },   // P 0x50 80
        { 0x3e,0x41,0x51,0x21,0x5e },   // Q 0x51 81
        { 0x7f,0x09,0x19,0x29,0x46 },   // R 0x52 82
        { 0x46,0x49,0x49,0x49,0x31 },   // S 0x53 83
        { 0x01,0x01,0x7f,0x01,0x01 },   // T 0x54 84
        { 0x3f,0x40,0x40,0x40,0x3f },   // U 0x55 85
        { 0x0f,0x30,0x40,0x30,0x0f },   // V 0x56 86
        { 0x3f,0x40,0x30,0x40,0x3f },   // W 0x57 87
        { 0x63,0x14,0x08,0x14,0x63 },   // X 0x58 88
        { 0x07,0x08,0x70,0x08,0x07 },   // Y 0x59 89
        { 0x61,0x51,0x49,0x45,0x43 },   // Z 0x5a 90
//      { 0x3c,0x4a,0x49,0x29,0x1e },   // [ 0x5b 91
        { 0x00,0x00,0x7f,0x41,0x00 },   // [ 0x5b 91
        { 0x02,0x04,0x08,0x10,0x20 },   // \ 0x5c 92
        { 0x00,0x41,0x7f,0x00,0x00 },   // ] 0x5d 93
        { 0x04,0x02,0x01,0x02,0x04 },   // ^ 0x5e 94
        { 0x40,0x40,0x40,0x40,0x40 },   // _ 0x5f 95
        { 0x00,0x00,0x03,0x04,0x00 },   // ` 0x60 96
        { 0x20,0x54,0x54,0x54,0x78 },   // a 0x61 97
        { 0x7f,0x48,0x44,0x44,0x38 },   // b 0x62 98
//      { 0x38,0x44,0x44,0x44,0x20 },   // c 0x63 99
        { 0x38,0x44,0x44,0x44,0x44 },   // c 0x63 99
        { 0x38,0x44,0x44,0x48,0x7f },   // d 0x64 100
        { 0x38,0x54,0x54,0x54,0x18 },   // e 0x65 101
        { 0x08,0x7e,0x09,0x01,0x02 },   // f 0x66 102
        { 0x0c,0x52,0x52,0x52,0x3e },   // g 0x67 103
        { 0x7f,0x08,0x04,0x04,0x78 },   // h 0x68 104
        { 0x00,0x44,0x7d,0x40,0x00 },   // i 0x69 105
        { 0x20,0x40,0x44,0x3d,0x00 },   // j 0x6a 106
        { 0x00,0x7f,0x10,0x28,0x44 },   // k 0x6b 107
        { 0x00,0x41,0x7f,0x40,0x00 },   // l 0x6c 108
        { 0x7c,0x04,0x18,0x04,0x78 },   // m 0x6d 109
        { 0x7c,0x08,0x04,0x04,0x78 },   // n 0x6e 110
        { 0x38,0x44,0x44,0x44,0x38 },   // o 0x6f 111
        { 0x7c,0x14,0x14,0x14,0x08 },   // p 0x70 112
//      { 0x08,0x14,0x14,0x18,0x7c },   // q 0x71 113
        { 0x08,0x14,0x14,0x14,0x7c },   // q 0x71 113
        { 0x7c,0x08,0x04,0x04,0x08 },   // r 0x72 114
        { 0x48,0x54,0x54,0x54,0x20 },   // s 0x73 115
        { 0x04,0x3f,0x44,0x40,0x20 },   // t 0x74 116
        { 0x3c,0x40,0x40,0x20,0x7c },   // u 0x75 117
        { 0x1c,0x20,0x40,0x20,0x1c },   // v 0x76 118
        { 0x3c,0x40,0x30,0x40,0x3c },   // w 0x77 119
        { 0x44,0x28,0x10,0x28,0x44 },   // x 0x78 120
        { 0x0c,0x50,0x50,0x50,0x3c },   // y 0x79 121
        { 0x44,0x64,0x54,0x4c,0x44 },   // z 0x7a 122
        { 0x00,0x08,0x36,0x41,0x41 },   // { 0x7b 123
        { 0x00,0x00,0x7f,0x00,0x00 },   // | 0x7c 124
        { 0x41,0x41,0x36,0x08,0x00 },   // } 0x7d 125
//      { 0x04,0x02,0x04,0x08,0x04 },   // ~ 0x7e 126
        { 0x08,0x0c,0x08,0x18,0x08 }    // ~ 0x7e 126
};

int main (int argc, char ** argv) {
        int arg, chr, col, shift;
        char c, * p;
        unsigned char * bits;

        for (arg = 1; arg < argc; ++ arg) {
                for (shift = 1; shift < 128; shift <<= 1) {
                        p = argv [arg];
                        while (c = * p ++) {
                                bits = font [c - ' '];
                                for (col = 0; col < 5; col ++) {
                                        putchar ((bits [col] & shift) ? '#' : '_');
                                }
                                putchar (' ');
                        }
                        putchar ('\n');
                }
                putchar ('\n');
        }
        return 0;
};

/* end: font.c */

Comments

Unknown said…
I don't get this.
18 September, 2012 14:56
austux said…
My original response to the Anonymous commenter vanished within seconds of being posted.
19 September, 2012 15:08
austux said…
(this is WRT the “5x7 text dot-matrix” post a few before this one)
19 September, 2012 15:13
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