1 | #include <avr/io.h>
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2 | #include <util/delay.h>
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3 | #include "lcd-routines.h"
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4 |
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5 | static void lcd_enable( void )
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6 | {
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7 | LCD_PORT |= (1<<LCD_EN); // Enable auf 1 setzen
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8 | _delay_us( LCD_ENABLE_US ); // kurze Pause
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9 | LCD_PORT &= ~(1<<LCD_EN); // Enable auf 0 setzen
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10 | }
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11 |
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12 | static void lcd_out( uint8_t data )
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13 | {
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14 | data &= 0xF0; // obere 4 Bit maskieren
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15 |
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16 | LCD_PORT &= ~(0xF0>>(4-LCD_DB)); // Maske löschen
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17 | LCD_PORT |= (data>>(4-LCD_DB)); // Bits setzen
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18 | lcd_enable();
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19 | }
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20 |
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21 | void lcd_init( void )
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22 | {
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23 | // verwendete Pins auf Ausgang schalten
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24 | uint8_t pins = (0x0F << LCD_DB) | // 4 Datenleitungen
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25 | (1<<LCD_RS) | // R/S Leitung
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26 | (1<<LCD_EN); // Enable Leitung
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27 | LCD_DDR |= pins;
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28 |
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29 | LCD_PORT &= ~pins;
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30 |
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31 | _delay_ms( LCD_BOOTUP_MS );
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32 |
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33 | lcd_out( LCD_SOFT_RESET );
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34 | _delay_ms( LCD_SOFT_RESET_MS1 );
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35 |
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36 | lcd_enable();
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37 | _delay_ms( LCD_SOFT_RESET_MS2 );
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38 |
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39 | lcd_enable();
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40 | _delay_ms( LCD_SOFT_RESET_MS3 );
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41 |
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42 | // 4-bit Modus aktivieren
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43 | lcd_out( LCD_SET_FUNCTION |
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44 | LCD_FUNCTION_4BIT );
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45 | _delay_ms( LCD_SET_4BITMODE_MS );
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46 |
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47 | // 4-bit Modus / 2 Zeilen / 5x7
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48 | lcd_command( LCD_SET_FUNCTION |
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49 | LCD_FUNCTION_4BIT |
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50 | LCD_FUNCTION_2LINE |
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51 | LCD_FUNCTION_5X7 );
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52 |
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53 | // Display ein / Cursor aus / Blinken aus
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54 | lcd_command( LCD_SET_DISPLAY |
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55 | LCD_DISPLAY_ON |
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56 | LCD_CURSOR_OFF |
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57 | LCD_BLINKING_OFF);
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58 |
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59 | // Cursor inkrement / kein Scrollen
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60 | lcd_command( LCD_SET_ENTRY |
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61 | LCD_ENTRY_INCREASE |
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62 | LCD_ENTRY_NOSHIFT );
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63 |
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64 | lcd_clear();
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65 | }
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66 |
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67 | void lcd_data( uint8_t data )
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68 | {
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69 | LCD_PORT |= (1<<LCD_RS); // RS auf 1 setzen
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70 |
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71 | lcd_out( data ); // zuerst die oberen,
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72 | lcd_out( data<<4 ); // dann die unteren 4 Bit senden
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73 |
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74 | _delay_us( LCD_WRITEDATA_US );
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75 | }
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76 |
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77 | void lcd_command( uint8_t data )
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78 | {
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79 | LCD_PORT &= ~(1<<LCD_RS); // RS auf 0 setzen
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80 |
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81 | lcd_out( data ); // zuerst die oberen,
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82 | lcd_out( data<<4 ); // dann die unteren 4 Bit senden
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83 |
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84 | _delay_us( LCD_COMMAND_US );
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85 | }
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86 |
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87 | void lcd_clear( void )
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88 | {
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89 | lcd_command( LCD_CLEAR_DISPLAY );
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90 | _delay_ms( LCD_CLEAR_DISPLAY_MS );
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91 | }
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92 |
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93 | void lcd_home( void )
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94 | {
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95 | lcd_command( LCD_CURSOR_HOME );
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96 | _delay_ms( LCD_CURSOR_HOME_MS );
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97 | }
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98 |
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99 | void lcd_setcursor( uint8_t x, uint8_t y )
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100 | {
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101 | uint8_t data;
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102 |
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103 | switch (y)
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104 | {
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105 | case 1: // 1. Zeile
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106 | data = LCD_SET_DDADR + LCD_DDADR_LINE1 + x;
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107 | break;
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108 |
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109 | case 2: // 2. Zeile
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110 | data = LCD_SET_DDADR + LCD_DDADR_LINE2 + x;
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111 | break;
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112 |
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113 | case 3: // 3. Zeile
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114 | data = LCD_SET_DDADR + LCD_DDADR_LINE3 + x;
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115 | break;
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116 |
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117 | case 4: // 4. Zeile
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118 | data = LCD_SET_DDADR + LCD_DDADR_LINE4 + x;
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119 | break;
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120 |
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121 | default:
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122 | return; // für den Fall einer falschen Zeile
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123 | }
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124 |
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125 | lcd_command( data );
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126 | }
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127 |
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128 | void lcd_string( const char *data )
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129 | {
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130 | while( *data != '\0' )
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131 | lcd_data( *data++ );
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132 | }
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133 |
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134 | void lcd_generatechar( uint8_t code, const uint8_t *data )
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135 | {
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136 | // Startposition des Zeichens einstellen
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137 | lcd_command( LCD_SET_CGADR | (code<<3) );
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138 |
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139 | // Bitmuster übertragen
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140 | for ( uint8_t i=0; i<8; i++ )
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141 | {
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142 | lcd_data( data[i] );
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143 | }
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144 | }/*
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