1 | /*
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2 | * File: meinLCD_1.c
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3 | * Author: gerhard hinze
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4 | *
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5 | * Created on 02. April 2017, 16:03
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6 | */
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7 | // CONFIG
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8 | #pragma config FOSC = XT // Oscillator Selection bits (XT oscillator)
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9 | #pragma config WDTE = OFF // Watchdog Timer Enable bit (WDT disabled)
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10 | #pragma config PWRTE = ON // Power-up Timer Enable bit (PWRT enabled)
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11 | #pragma config BOREN = OFF // Brown-out Reset Enable bit (BOR disabled)
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12 | #pragma config LVP = OFF // Low-Voltage (Single-Supply) In-Circuit Serial Programming Enable bit (RB3 is digital I/O, HV on MCLR must be used for programming)
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13 | #pragma config CPD = OFF // Data EEPROM Memory Code Protection bit (Data EEPROM code protection off)
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14 | #pragma config WRT = OFF // Flash Program Memory Write Enable bits (Write protection off; all program memory may be written to by EECON control)
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15 | #pragma config CP = OFF // Flash Program Memory Code Protection bit (Code protection off)
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16 |
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17 | // #pragma config statements should precede project file includes.
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18 | // Use project enums instead of #define for ON and OFF.
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19 | #define _XTAL_FREQ 4000000 //EasyPIC-40 FQ= 4.0MHz
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20 | //#define _XTAL_FREQ 3686400 //EasyPIC-40 FQ= 3.6864MHz
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21 | #include <xc.h>
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22 | /* ========================================================================== */
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23 | /* */
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24 | /* MCU = PIC16F877A XTAL = 4.000 MHz */
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25 | /* */
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26 | /* ========================================================================== */
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27 | /* */
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28 | /* Definitionen LCD 16x2 Anschlüsse */
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29 | /* */
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30 | /* ========================================================================== */
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31 |
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32 | #define RS RA1
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33 | #define RW RA2
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34 | #define EN RA3
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35 |
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36 | #define D0 RD0
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37 | #define D1 RD1
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38 | #define D2 RD2
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39 | #define D3 RD3
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40 | #define D4 RD4
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41 | #define D5 RD5
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42 | #define D6 RD6
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43 | #define D7 RD7
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44 |
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45 | #define SET_CMD_PORT TRISA
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46 | #define SET_DAT_PORT TRISD
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47 | #define DATA_PORT PORTD
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48 | #define CMD_PORT PORTA
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49 |
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50 | #define DELAY_INIT __delay_ms(200)
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51 | #define DELAY_CMD __delay_ms(50)
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52 | #define DELAY_DAT __delay_ms(10)
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53 | /* ========================================================================== */
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54 | /* */
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55 | /* */
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56 | /* */
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57 | /* ========================================================================== */
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58 | void LCD_Init();
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59 | void CMD_Init();
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60 | void CHR_Init();
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61 | void CMD_Write(unsigned char cmd);
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62 | void CHR_Write(unsigned char chr);
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63 | void TXT_Write(char *txt, unsigned char x, unsigned char y);
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64 | void SET_Pos(unsigned char x, unsigned char y);
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65 | /* ========================================================================== */
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66 | /* */
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67 | /* LCD Initialisieren */
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68 | /* */
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69 | /* ========================================================================== */
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70 | void LCD_Init()
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71 | {
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72 | SET_CMD_PORT = 0x00; // PORTA alles OUTPUT
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73 | SET_DAT_PORT = 0x00; // PORTD alles OUTPUT
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74 | CMD_PORT = 0x00; // PORTA alles LOW - Pegel
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75 | DATA_PORT = 0x00; // PORTD alles LOW - Pegel
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76 |
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77 | DELAY_INIT; // Warten bis Ub(LCD) sich stabilisiert hat
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78 | CMD_Write(0x01); // Display clear, Cursor auf Pos. 1.1
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79 | CMD_Init();
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80 |
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81 | CMD_Write(0x38); // 8-BIT 5*7Pkt
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82 | CMD_Init();
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83 |
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84 | CMD_Write(0x0C); // Display ein und Cursor OFF, blinkt nicht
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85 | CMD_Init();
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86 |
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87 | CMD_Write(0x06); // Cursor autoincrement
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88 | CMD_Init();
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89 |
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90 | CMD_Write(0x80); // Setze Cursor Zeile 1, Spalte 0
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91 | CMD_Init();
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92 |
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93 | }
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94 | /* ========================================================================== */
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95 | /* */
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96 | /* Kommando Init zur Kommandouebernahme vom PORTD */
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97 | /* */
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98 | /* ========================================================================== */
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99 | void CMD_Init()
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100 | {
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101 | RS = 0; // Kommando
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102 | RW = 0;
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103 | EN = 0;
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104 | DELAY_CMD;
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105 | EN = 1;
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106 | DELAY_CMD;
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107 | }
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108 |
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109 | /* ========================================================================== */
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110 | /* */
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111 | /* Kommando Init zur Datenuebernahme vom PORTD */
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112 | /* */
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113 | /* ========================================================================== */
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114 | void CHR_Init()
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115 | {
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116 | RS = 1; //Daten
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117 | RW = 0;
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118 | EN = 0;
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119 | DELAY_DAT;
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120 | EN = 1;
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121 | DELAY_DAT;
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122 | }
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123 | /* ========================================================================== */
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124 | /* */
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125 | /* Kommando Schreiben */
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126 | /* */
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127 | /* ========================================================================== */
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128 | void CMD_Write(unsigned char cmd)
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129 | {
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130 | DATA_PORT = cmd; //PORTD = cmd(Befehlswert)
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131 | CMD_Init();
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132 | }
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133 | /* ========================================================================== */
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134 | /* */
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135 | /* 1 Zeichen schreiben */
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136 | /* */
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137 | /* ========================================================================== */
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138 | void CHR_Write(unsigned char chr)
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139 | {
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140 | DATA_PORT = chr; //PORTD = chr (Zeichen/Byte)
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141 | CHR_Init();
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142 |
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143 | }
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144 |
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145 | /* ========================================================================== */
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146 | /* */
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147 | /* Cursor Position schreiben */
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148 | /* */
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149 | /* ========================================================================== */
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150 | void SET_Pos(unsigned char x, unsigned char y)
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151 | {
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152 | if(y == 1) // Zeile 1
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153 | CMD_Write(0x80 + x); // Setze RAM-Adresse + X-position
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154 | else if(y == 2) // Zeile 2
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155 | CMD_Write(0xC0 + x); // Setze RAM-Adresse + X-position
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156 | }
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157 |
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158 | /* ========================================================================== */
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159 | /* */
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160 | /* Text schreiben */
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161 | /* */
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162 | /* ========================================================================== */
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163 | void TXT_Write(char *txt, unsigned char x, unsigned char y)
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164 | { SET_Pos(x,y);
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165 | int i;
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166 | for(i=0;i<=16;i++)
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167 | {// Durchlauf Textstring bis Stringende: "0"
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168 | if (txt[i]== 0)
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169 | return;
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170 | else
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171 | CHR_Write(txt[i]);
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172 | }// Char ("Zeichen") schreiben
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173 | }
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174 |
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175 | /* ========================================================================== */
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176 | /* */
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177 | /* */
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178 | /* */
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179 | /* */
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180 | /* ========================================================================== */
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181 |
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182 |
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183 | void init()
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184 | {
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185 | ADCON1 = 0x07; // PORTA als digitaler I/O
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186 |
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187 | }
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188 |
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189 | /* ========================================================================== */
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190 | /* */
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191 | /* Mainroutine/Hauptprogramm */
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192 | /* */
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193 | /* ========================================================================== */
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194 |
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195 |
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196 | void main(void) {
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197 | init();
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198 | LCD_Init();
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199 | __delay_ms(200);
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200 | TXT_Write("Hallo",6,1); // Schreibe in Zeile 1 ab Spalte 5
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201 | TXT_Write("PIC16F877A",3,2); // Schreibe in Zeile 2 ab Spalte 3
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202 |
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203 | while(1);
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204 | }
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