1 | #define LCD_CLEAR 0x01 // clear display 0b 0000 0001
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2 | #define LCD_HOME 0x02 // cursor home 0b 0000 0010
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3 | #define LCD_ON 0x0C // cursor invisible 0b 0000 1100
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4 | #define LCD_OFF 0x08 // display off 0b 0000 1000
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5 | #define POS_01 0x80 // line 1 - column 0 0b 1000 0000
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6 | #define POS_02 0xC0 // line 2 - column 0 0b 1100 0000
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7 |
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8 | #define LCDPORT PORTC // define port with LCD attached
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9 | #define LCDDDR DDRC // and its data direction
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10 |
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11 | // define pins of LCD port
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12 | #define LCD_PIN_RS 2
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13 | #define LCD_PIN_E 3
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14 | #define LCD_PIN_D4 4
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15 | #define LCD_PIN_D5 5
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16 | #define LCD_PIN_D6 6
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17 | #define LCD_PIN_D7 7
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18 |
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19 | // DEFINITIONS
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20 | #define sbi(PORT, bit) (PORT|=(1<<bit)) // set bit
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21 | #define cbi(PORT, bit) (PORT&=~(1<<bit)) // claear bit
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22 | #define tbi(PORT, bit) (PORT^=(1<<bit)) // toggle bit
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23 |
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24 | #define COMMAND 0
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25 | #define DATA 1
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26 |
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27 | // Function: Toggle enable pin
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28 | void toggle_enable_pin(void)
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29 | {
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30 | sbi(LCDPORT, LCD_PIN_E);
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31 | cbi(LCDPORT, LCD_PIN_E);
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32 | }
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33 |
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34 | // Send Byte to LCD Controller
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35 | void lcd_send(unsigned char type, unsigned char c)
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36 | {
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37 | unsigned char sic_c; // Backup for c
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38 | // send high nibble
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39 | sic_c = c; // save original c
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40 | sic_c &= ~0x0f; // set bit 0-3 == 0
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41 | if (type==DATA)
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42 | sic_c |= (1<<LCD_PIN_RS); // Data: RS = 1
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43 | LCDPORT = sic_c; // send high nibble
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44 | toggle_enable_pin();
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45 | // send low nibble
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46 | sic_c = c; // save original c
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47 | sic_c = sic_c<<4; // exchange nibbles
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48 | sic_c &= ~0x0f; // set bit 0-3 == 0
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49 | if (type==DATA)
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50 | sic_c |= (1<<LCD_PIN_RS); // Data: RS = 1
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51 | LCDPORT = sic_c; // send low nibble
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52 | toggle_enable_pin();
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53 | _delay_ms(5); // Wait for LCD controller
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54 | }
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55 |
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56 | // set cursor to line x and column y
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57 | void lcd_set_cursor(uint8_t x, uint8_t y)
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58 | {
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59 | uint8_t i;
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60 |
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61 | switch (x)
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62 | {
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63 | case 1: i=0x80+0x00+y; break; // 1. line
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64 | case 2: i=0x80+0x40+y; break; // 2. line
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65 | default: return; // invalid line
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66 | }
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67 | lcd_send(COMMAND, i);
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68 | }
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69 |
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70 | // Display String on LCD
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71 | void lcd_write(char *t)
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72 | {
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73 | unsigned char i;
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74 | for (i=0;i<255;i++)
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75 | {
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76 | if (t[i]==0) // End of String -> EXIT
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77 | return;
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78 | else
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79 | lcd_send(DATA, t[i]);
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80 | }
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81 | }
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82 |
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83 |
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84 | // initializing LCD Controller see data sheet for details
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85 | void lcd_init()
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86 | {
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87 | // Set LCD port to Output
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88 | LCDPORT = 0x00;
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89 | LCDDDR = 0xFF;
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90 |
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91 | _delay_ms(50); // wait for LCD
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92 |
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93 | // 4-bit Modus config
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94 | sbi(LCDPORT, LCD_PIN_D5);
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95 | cbi(LCDPORT, LCD_PIN_D4);
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96 |
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97 | // 4-Bit mode start
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98 | sbi(LCDPORT, LCD_PIN_E);
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99 | cbi(LCDPORT, LCD_PIN_E);
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100 | _delay_ms(5);
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101 |
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102 | // 2 Lines, 4-Bit Mode
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103 | lcd_send(COMMAND, 0x28);
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104 |
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105 | lcd_send(COMMAND, LCD_OFF);
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106 | lcd_send(COMMAND, LCD_CLEAR);
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107 |
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108 | lcd_send(COMMAND, 0x06);
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109 | lcd_send(COMMAND, LCD_ON);
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110 | }
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