1 | /****************************************************************
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2 | * LCD Ausgabe für Hitachi HD44780 kompatible LCD Controller *
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3 | * *
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4 | * Mikroontroller: AT90PWM316 *
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5 | * Clock: 8MHz intern *
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6 | * LCD-Display: Displaytech 162B *
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7 | * LCD-Controller: KS0070B *
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8 | * *
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9 | * Konfiguration: PORT D7 = LCD D7 *
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10 | * PORT D6 = LCD D6 *
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11 | * PORT D5 = LCD D5 *
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12 | * PORT D4 = LCD D4 *
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13 | * PORT D3 = LCD E *
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14 | * PORT D2 = LCD RS *
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15 | * GND = LCD Vss + LCD R/W + LCD K *
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16 | * +5V = LCD Vdd *
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17 | * Poti = LCD V0 *
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18 | * +5V (über R = 1kOhm) = LCD A *
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19 | ****************************************************************/
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20 |
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21 | #define F_CPU 8000000
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22 |
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23 | #include <avr/io.h>
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24 | #include <util/delay.h>
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25 |
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26 | #define LCDPORT PORTD
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27 | #define LCDDDR DDRD
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28 | #define LCD_PIN_RS 2
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29 | #define LCD_PIN_E 3
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30 | #define LCD_PIN_D4 4
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31 | #define LCD_PIN_D5 5
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32 | #define LCD_PIN_D6 6
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33 | #define LCD_PIN_D7 7
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34 |
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35 |
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36 | /***** LCD STEUERBEFEHLE *****/
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37 |
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38 | #define LCD_CLEAR 0x01 // Display löschen
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39 | #define LCD_HOME 0x02 // Cursor an den Anfang zurück
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40 | #define LCD_ON 0x0C // 0x0C = LCD ON, Cursor OFF
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41 | //#define LCD_ON 0x0E // 0x0E = LCD ON, Cursor ON
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42 | #define LCD_OFF 0x08 // Display OFF
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43 |
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44 | /***** HILFSDEFINITIONEN *****/
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45 |
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46 | #define BEFEHL 0
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47 | #define DATEN 1
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48 | #define sbi(sfr, bit) (sfr |= (1<<bit))
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49 | #define cbi(sfr, bit) (sfr &= ~(1<<bit))
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50 |
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51 |
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52 | /****** Sendet ein Byte an den LCD Controller ******/
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53 | void lcd_send(unsigned char type, unsigned char c)
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54 | {
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55 | if (type==BEFEHL)
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56 | cbi(LCDPORT, LCD_PIN_RS); /* RS=0: Befehl folgt ... ******/
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57 | else
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58 | sbi(LCDPORT, LCD_PIN_RS); /* RS=1: Daten folgen ... ******/
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59 |
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60 | /* (1) HIGH NIBBLE wird gesendet ******/
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61 | if (bit_is_set(c, 7))
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62 | sbi(LCDPORT, LCD_PIN_D7);
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63 | else cbi(LCDPORT, LCD_PIN_D7);
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64 |
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65 | if (bit_is_set(c, 6))
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66 | sbi(LCDPORT, LCD_PIN_D6);
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67 | else cbi(LCDPORT, LCD_PIN_D6);
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68 |
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69 | if (bit_is_set(c, 5))
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70 | sbi(LCDPORT, LCD_PIN_D5);
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71 | else cbi(LCDPORT, LCD_PIN_D5);
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72 |
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73 | if (bit_is_set(c, 4))
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74 | sbi(LCDPORT, LCD_PIN_D4);
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75 | else cbi(LCDPORT, LCD_PIN_D4);
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76 |
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77 | /* Flanke zur Übernahme der Daten senden ... ******/
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78 | sbi(LCDPORT, LCD_PIN_E);
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79 | _delay_ms(1);
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80 | cbi(LCDPORT, LCD_PIN_E);
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81 |
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82 |
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83 | /* (2) LOW NIBBLE wird gesendet ******/
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84 | if (bit_is_set(c, 3))
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85 | sbi(LCDPORT, LCD_PIN_D7);
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86 | else cbi(LCDPORT, LCD_PIN_D7);
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87 |
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88 | if (bit_is_set(c, 2))
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89 | sbi(LCDPORT, LCD_PIN_D6);
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90 | else cbi(LCDPORT, LCD_PIN_D6);
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91 |
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92 | if (bit_is_set(c, 1))
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93 | sbi(LCDPORT, LCD_PIN_D5);
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94 | else cbi(LCDPORT, LCD_PIN_D5);
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95 |
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96 | if (bit_is_set(c, 0))
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97 | sbi(LCDPORT, LCD_PIN_D4);
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98 | else cbi(LCDPORT, LCD_PIN_D4);
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99 |
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100 | /* Flanke zur Übernahme der Daten senden ... ******/
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101 | sbi(LCDPORT, LCD_PIN_E);
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102 | _delay_ms(1);
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103 | cbi(LCDPORT, LCD_PIN_E);
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104 |
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105 | /* (3) Auf den LCD Controller warten ...******/
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106 | _delay_ms(5);
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107 | }
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108 |
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109 |
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110 | /****** Stellt eine Zeichenkette am LCD dar ******/
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111 | void lcd_write_zeile1(char *t)
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112 | {
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113 | unsigned char i;
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114 | for (i=0;i<255;i++)
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115 | {
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116 | if (t[i]==0) // String-Ende? Dann raus hier ...
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117 | return;
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118 | else
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119 | lcd_send(DATEN, t[i]);
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120 | }
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121 | }
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122 |
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123 | /****** Initialisierung des LCD Controllers *****/
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124 | void lcd_init()
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125 | {
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126 | /* Port auf Ausgang schalten */
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127 | LCDPORT = 0x00;
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128 | LCDDDR = 0xFF;
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129 |
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130 | _delay_ms(40); // Warten bis LCD bereit ...
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131 |
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132 | /* 4-bit Modus konfigurieren ------Function-Set 1*/
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133 | sbi(LCDPORT, LCD_PIN_D5);
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134 | cbi(LCDPORT, LCD_PIN_D4);
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135 |
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136 | _delay_ms(40);
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137 | /* 4-bit Modus konfigurieren ------Function-Set 2*/
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138 | sbi(LCDPORT, LCD_PIN_D5);
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139 | cbi(LCDPORT, LCD_PIN_D4);
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140 |
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141 | _delay_ms(5);
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142 | /* 4-bit Modus konfigurieren ------Function-Set 3*/
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143 | sbi(LCDPORT, LCD_PIN_D5);
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144 | cbi(LCDPORT, LCD_PIN_D4);
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145 |
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146 | /* 4-Bit Modus starten ... */
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147 | sbi(PORTD, LCD_PIN_E);
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148 | cbi(PORTD, LCD_PIN_E);
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149 | _delay_ms(5);
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150 |
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151 | /* 2 Zeilen, 4-Bit Modus */
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152 | lcd_send(BEFEHL, 0x28);
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153 | //lcd_send(BEFEHL, 0x14);
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154 |
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155 | lcd_send(BEFEHL, LCD_OFF);
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156 | lcd_send(BEFEHL, LCD_CLEAR);
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157 |
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158 | lcd_send(BEFEHL, 0x06);
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159 | lcd_send(BEFEHL, LCD_ON);
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160 | }
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161 |
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162 |
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163 | /****** Hilfsfunktion: Warte i Sekunden ******/
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164 | void sekunde(char i)
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165 | {
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166 | unsigned char k;
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167 | for (;i>0;i--)
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168 | {
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169 | for (k=0;k<10;k++)
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170 | _delay_ms(50);
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171 | }
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172 | }
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173 |
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174 | /***** HAUPTPROGRAMM *****/
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175 |
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176 | int main(void)
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177 | {
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178 | _delay_ms(50);
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179 | lcd_init();
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180 | lcd_write_zeile1("Starting LCD...");
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181 |
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182 | while (1)
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183 | {
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184 | sekunde(5);
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185 | lcd_send(BEFEHL, LCD_CLEAR);
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186 | lcd_write_zeile1("LCD-Test");
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187 |
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188 | sekunde(5);
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189 | lcd_send(BEFEHL, LCD_CLEAR);
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190 | lcd_write_zeile1("LCD-Test Zeile2");
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191 | }
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192 | }
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