1 | void lcd_init(uint8_t dispAttr)
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2 | {
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3 | #if LCD_IO_MODE
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4 | /*
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5 | * Initialize LCD to 4 bit I/O mode
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6 | */
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7 |
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8 | if ( ( &LCD_DATA0_PORT == &LCD_DATA1_PORT) && ( &LCD_DATA1_PORT == &LCD_DATA2_PORT ) && ( &LCD_DATA2_PORT == &LCD_DATA3_PORT )
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9 | && ( &LCD_RS_PORT == &LCD_DATA0_PORT) && ( &LCD_RW_PORT == &LCD_DATA0_PORT) && (&LCD_E_PORT == &LCD_DATA0_PORT)
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10 | && (LCD_DATA0_PIN == 0 ) && (LCD_DATA1_PIN == 1) && (LCD_DATA2_PIN == 2) && (LCD_DATA3_PIN == 3)
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11 | && (LCD_RS_PIN == 4 ) && (LCD_RW_PIN == 5) && (LCD_E_PIN == 6 ) )
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12 | {
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13 | /* configure all port bits as output (all LCD lines on same port) */
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14 | DDR(LCD_DATA0_PORT) |= 0x7F;
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15 | }
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16 | else if ( ( &LCD_DATA0_PORT == &LCD_DATA1_PORT) && ( &LCD_DATA1_PORT == &LCD_DATA2_PORT ) && ( &LCD_DATA2_PORT == &LCD_DATA3_PORT )
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17 | && (LCD_DATA0_PIN == 0 ) && (LCD_DATA1_PIN == 1) && (LCD_DATA2_PIN == 2) && (LCD_DATA3_PIN == 3) )
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18 | {
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19 | /* configure all port bits as output (all LCD data lines on same port, but control lines on different ports) */
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20 | DDR(LCD_DATA0_PORT) |= 0x0F;
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21 | DDR(LCD_RS_PORT) |= _BV(LCD_RS_PIN);
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22 | DDR(LCD_RW_PORT) |= _BV(LCD_RW_PIN);
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23 | DDR(LCD_E_PORT) |= _BV(LCD_E_PIN);
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24 | }
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25 | else
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26 | {
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27 | /* configure all port bits as output (LCD data and control lines on different ports */
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28 | DDR(LCD_RS_PORT) |= _BV(LCD_RS_PIN);
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29 | DDR(LCD_RW_PORT) |= _BV(LCD_RW_PIN);
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30 | DDR(LCD_E_PORT) |= _BV(LCD_E_PIN);
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31 | DDR(LCD_DATA0_PORT) |= _BV(LCD_DATA0_PIN);
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32 | DDR(LCD_DATA1_PORT) |= _BV(LCD_DATA1_PIN);
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33 | DDR(LCD_DATA2_PORT) |= _BV(LCD_DATA2_PIN);
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34 | DDR(LCD_DATA3_PORT) |= _BV(LCD_DATA3_PIN);
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35 | }
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36 | delay(16000); /* wait 16ms or more after power-on */
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37 |
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38 | /* initial write to lcd is 8bit */
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39 | LCD_DATA1_PORT |= _BV(LCD_DATA1_PIN); // _BV(LCD_FUNCTION)>>4;
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40 | LCD_DATA0_PORT |= _BV(LCD_DATA0_PIN); // _BV(LCD_FUNCTION_8BIT)>>4;
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41 | lcd_e_toggle();
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42 | delay(4992); /* delay, busy flag can't be checked here */
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43 |
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44 | /* repeat last command */
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45 | lcd_e_toggle();
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46 | delay(64); /* delay, busy flag can't be checked here */
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47 |
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48 | /* repeat last command a third time */
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49 | lcd_e_toggle();
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50 | delay(64); /* delay, busy flag can't be checked here */
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51 |
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52 | /* now configure for 4bit mode */
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53 | LCD_DATA0_PORT &= ~_BV(LCD_DATA0_PIN); // LCD_FUNCTION_4BIT_1LINE>>4
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54 | lcd_e_toggle();
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55 | delay(64); /* some displays need this additional delay */
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56 |
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57 | /* from now the LCD only accepts 4 bit I/O, we can use lcd_command() */
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58 | #else
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59 | /*
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60 | * Initialize LCD to 8 bit memory mapped mode
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61 | */
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62 |
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63 | /* enable external SRAM (memory mapped lcd) and one wait state */
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64 | MCUCR = _BV(SRE) | _BV(SRW);
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65 |
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66 | /* reset LCD */
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67 | delay(16000); /* wait 16ms after power-on */
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68 | lcd_write(LCD_FUNCTION_8BIT_1LINE,0); /* function set: 8bit interface */
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69 | delay(4992); /* wait 5ms */
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70 | lcd_write(LCD_FUNCTION_8BIT_1LINE,0); /* function set: 8bit interface */
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71 | delay(64); /* wait 64us */
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72 | lcd_write(LCD_FUNCTION_8BIT_1LINE,0); /* function set: 8bit interface */
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73 | delay(64); /* wait 64us */
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74 | #endif
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75 |
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76 | #if KS0073_4LINES_MODE
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77 | /* Display with KS0073 controller requires special commands for enabling 4 line mode */
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78 | lcd_command(KS0073_EXTENDED_FUNCTION_REGISTER_ON);
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79 | lcd_command(KS0073_4LINES_MODE);
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80 | lcd_command(KS0073_EXTENDED_FUNCTION_REGISTER_OFF);
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81 | #else
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82 | lcd_command(LCD_FUNCTION_DEFAULT); /* function set: display lines */
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83 | #endif
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84 | lcd_command(LCD_DISP_OFF); /* display off */
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85 | lcd_clrscr(); /* display clear */
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86 | lcd_command(LCD_MODE_DEFAULT); /* set entry mode */
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87 | lcd_command(dispAttr); /* display/cursor control */
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88 |
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89 | }/* lcd_init */
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