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/**
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/**
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 * draw a compass rose at <x>/<y> for <heading>
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 * draw a compass rose at <x>/<y> for <heading>
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 */
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 */
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void draw_compass(uint8_t x, uint8_t y, uint16_t heading) {
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void draw_compass(uint8_t x, uint8_t y, uint16_t heading) {
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    //char* rose = "---N---O---S---W---N---O---S---W---N---O---S---W";
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    //char* rose = "---N---O---S---W---N---O---S---W---N---O---S---W";
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    char rose[48] = {216, 215, 216, 211, 216, 215, 216, 213, 216, 215, 216, 212,
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    static char rose[48] PROGMEM = {216, 215, 216, 211, 216, 215, 216, 213, 216, 215, 216, 212,
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                    216, 215, 216, 214, 216, 215, 216, 211, 216, 215, 216, 213,
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                    216, 215, 216, 214, 216, 215, 216, 211, 216, 215, 216, 213,
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                    216, 215, 216, 212, 216, 215, 216, 214, 216, 215, 216, 211,
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                    216, 215, 216, 212, 216, 215, 216, 214, 216, 215, 216, 211,
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                    216, 215, 216, 213, 216, 215, 216, 212, 216, 215, 216, 214};
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                    216, 215, 216, 213, 216, 215, 216, 212, 216, 215, 216, 214};
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        // the center is char 19 (north), we add the current heading in 8th
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        // the center is char 19 (north), we add the current heading in 8th
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        // which would be 22.5 degrees, but float would bloat up the code
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        // which would be 22.5 degrees, but float would bloat up the code
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        // and *10 / 225 would take ages... so we take the uncorrect way
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        // and *10 / 225 would take ages... so we take the uncorrect way
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    uint8_t front = 19 + (heading / 22);
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    uint8_t front = 19 + (heading / 22);
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    for (uint8_t i = 0; i < 9; i++) {
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    for (uint8_t i = 0; i < 9; i++) {
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                write_char_xy(x++, y, rose[front - 4 + i]);
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                write_char_xy(x++, y, pgm_read_byte(&rose[front - 4 + i]));
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    }
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    }
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}
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}
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/* ##########################################################################
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/* ##########################################################################
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                }
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                }
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        }
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        }
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}
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}
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// big vario arrays
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// big vario arrays
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char vario_00[5] PROGMEM = {0x00, 0x00, 0xc2, 0xff, 0xff};
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const char vario_00[5] PROGMEM = {0x00, 0x00, 0xc2, 0xff, 0xff};
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char vario_01[5] PROGMEM = {0x00, 0x00, 0xc2, 0xff, 0xc0};
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const char vario_01[5] PROGMEM = {0x00, 0x00, 0xc2, 0xff, 0xc0};
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char vario_02[5] PROGMEM = {0x00, 0x00, 0xc2, 0xff, 0xc1};
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const char vario_02[5] PROGMEM = {0x00, 0x00, 0xc2, 0xff, 0xc1};
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char vario_03[5] PROGMEM = {0x00, 0x00, 0xc2, 0xff, 0x00};
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const char vario_03[5] PROGMEM = {0x00, 0x00, 0xc2, 0xff, 0x00};
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char vario_04[5] PROGMEM = {0x00, 0x00, 0xc2, 0xc0, 0x00};
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const char vario_04[5] PROGMEM = {0x00, 0x00, 0xc2, 0xc0, 0x00};
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char vario_05[5] PROGMEM = {0x00, 0x00, 0xc2, 0xc1, 0x00};
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const char vario_05[5] PROGMEM = {0x00, 0x00, 0xc2, 0xc1, 0x00};
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char vario_06[5] PROGMEM = {0x00, 0x00, 0xc2, 0x00, 0x00};
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const char vario_06[5] PROGMEM = {0x00, 0x00, 0xc2, 0x00, 0x00};
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char vario_07[5] PROGMEM = {0x00, 0x00, 0xbb, 0x00, 0x00};
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const char vario_07[5] PROGMEM = {0x00, 0x00, 0xbb, 0x00, 0x00};
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char vario_08[5] PROGMEM = {0x00, 0x00, 0xc3, 0x00, 0x00};
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const char vario_08[5] PROGMEM = {0x00, 0x00, 0xc3, 0x00, 0x00};
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char vario_09[5] PROGMEM = {0x00, 0xc4, 0xc3, 0x00, 0x00};
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const char vario_09[5] PROGMEM = {0x00, 0xc4, 0xc3, 0x00, 0x00};
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char vario_10[5] PROGMEM = {0x00, 0xc5, 0xc3, 0x00, 0x00};
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const char vario_10[5] PROGMEM = {0x00, 0xc5, 0xc3, 0x00, 0x00};
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char vario_11[5] PROGMEM = {0x00, 0xff, 0xc3, 0x00, 0x00};
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const char vario_11[5] PROGMEM = {0x00, 0xff, 0xc3, 0x00, 0x00};
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char vario_12[5] PROGMEM = {0xc4, 0xff, 0xc3, 0x00, 0x00};
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const char vario_12[5] PROGMEM = {0xc4, 0xff, 0xc3, 0x00, 0x00};
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char vario_13[5] PROGMEM = {0xc5, 0xff, 0xc3, 0x00, 0x00};
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const char vario_13[5] PROGMEM = {0xc5, 0xff, 0xc3, 0x00, 0x00};
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char vario_14[5] PROGMEM = {0xff, 0xff, 0xc3, 0x00, 0x00};
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const char vario_14[5] PROGMEM = {0xff, 0xff, 0xc3, 0x00, 0x00};
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char* vario_pnt[15] PROGMEM = {vario_00, vario_01, vario_02, vario_03, vario_04,
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const char* vario_pnt[15] PROGMEM = {vario_00, vario_01, vario_02, vario_03, vario_04,
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                                vario_05, vario_06, vario_07, vario_08,
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                                vario_05, vario_06, vario_07, vario_08,
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                                vario_09, vario_10, vario_11, vario_12,
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                                vario_09, vario_10, vario_11, vario_12,
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                                vario_13, vario_14};
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                                vario_13, vario_14};
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        if (index > 14) index = 14;
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        if (index > 14) index = 14;
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        else if (index < 0) index = 0;
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        else if (index < 0) index = 0;
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        // TODO: why does write_string_pgm_down(x, y-2, vario_pnt[index], 5);
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        // TODO: why does write_string_pgm_down(x, y-2, vario_pnt[index], 5);
- 
 
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        // not work??? WTF?!
- 
 
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        write_string_pgm_down(x, y-2, (const char *) (pgm_read_word ( &(vario_pnt[index]))), 5);
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        // not work??? WTF?!
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#if 0
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        switch (index) {
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        switch (index) {
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                case 0: write_string_pgm_down(x, y-2, vario_pnt[0], 5);
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                case 0: write_string_pgm_down(x, y-2, vario_pnt[0], 5);
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                        break;
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                        break;
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                case 1: write_string_pgm_down(x, y-2, vario_pnt[1], 5);
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                case 1: write_string_pgm_down(x, y-2, vario_pnt[1], 5);
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                case 12: write_string_pgm_down(x, y-2, vario_pnt[12], 5);
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                case 12: write_string_pgm_down(x, y-2, vario_pnt[12], 5);
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                        break;
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                        break;
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                case 13: write_string_pgm_down(x, y-2, vario_pnt[13], 5);
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                case 13: write_string_pgm_down(x, y-2, vario_pnt[13], 5);
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                        break;
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                        break;
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                default: write_string_pgm_down(x, y-2, vario_pnt[14], 5);
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                default: write_string_pgm_down(x, y-2, vario_pnt[14], 5);
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        }              
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        }
- 
 
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#endif
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}
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}
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/* ##########################################################################
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/* ##########################################################################
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 * artificial horizon
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 * artificial horizon