Diff: TextLCD_4x40/TextLCD_4x40.cpp

Revision:

0:18d40dac71ff

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/TextLCD_4x40/TextLCD_4x40.cpp	Tue May 29 09:30:20 2012 +0000
@@ -0,0 +1,131 @@
+/*Modification de :" mbed TextLCD Library, for a 4-bit LCD based on HD44780........"
+  pour la commande d'un afficheur 4x40 (M4024)
+ */
+#include "TextLCD_4x40.h"
+#include "mbed.h"
+
+TextLCD_4x40::TextLCD_4x40(PinName rs, PinName e, PinName d0, PinName d1, PinName d2, PinName d3) :
+                        _rs(rs),_e(e), _d(d0, d1, d2, d3) {
+
+//-------------------------------------
+char  euro_v1[8]={0x06,0x09,0x1c,0x08,0x1C,0x09,0x06,0}//symbole euro
+     ,e_aigu[8] ={0x02,0x04,0x0e,0x11,0x1f,0x10,0x0e,0}//e accent aigu
+       ;
+//-------------------------------------
+char i;
+    _e  = 1;
+    _rs = 0;            // command mode
+
+    wait_ms(15);        // Wait 15ms to ensure powered up
+
+    // send "Display Settings" 3 times (Only top nibble of 0x30 as we've got 4-bit bus)
+    for (char i=0; i<3; i++) {
+        writeByte(0x3);
+        wait_us(1640);  // this command takes 1.64ms, so wait for it
+    }
+    writeByte(0x2);     // 4-bit mode
+    wait_us(40);    // most instructions take 40us
+
+    writeCommand(0x28); // Function set 001 BW N F - -
+    writeCommand(0x0C);
+    writeCommand(0x6);  // Cursor Direction and Display Shift : 0000 01 CD S (CD 0-left, 1-right S(hift) 0-no, 1-yes
+    cls();
+wait_ms(6);
+
+////////////////////// Generateur de caracteres ////////////////////////////////
+//........ chargement du 1er caractere .........
+   for(i=0;i<=7;i++){
+         writeCommand(0x40+i);
+         writeData(e_aigu[i]);
+                        }
+//........ chargement du 2eme caractere .........
+   for(i=0;i<=7;i++){
+         writeCommand(0x48+i);
+         writeData(euro_v1[i]);
+                        }
+/////////////////////// Fin du generateur de caracteres ///////////////////////
+
+writeCommand(2);// "home" pour que l'afficheur soit pret a afficher,
+                // pour sortir du generateur de caracteres
+}
+
+void TextLCD_4x40::character(char column, char row, char c) {
+    char a = address(column, row);
+    writeCommand(a);
+    writeData(c);
+}
+
+void TextLCD_4x40::cls() {
+    writeCommand(0x01); // cls, and set cursor to 0
+    wait_us(1640);     // This command takes 1.64 ms
+//    locate(0, 0);
+}
+
+void TextLCD_4x40::locate(char column, char row) {
+    _column = column;
+    _row = row;
+}
+
+//-----------------------------
+int TextLCD_4x40::_putc(int value) {
+ switch(value)
+   {
+    case '\f':
+      cls();
+      break;
+
+    case '\n':
+         _column = 0;
+        _row++;
+        if (_row >= 2) {
+            _row = 0;
+        }
+       break;
+
+    case '\b':
+       writeCommand(0x10);
+       break;
+
+    case '\1':
+       writeData(0);
+       break;
+    case '\2':
+       writeData(1);
+       break;
+    default:
+       writeData(value);
+       break;    
+   }
+ return value;
+}
+//-----------------------------
+int TextLCD_4x40::_getc() {
+    return -1;
+}
+
+void TextLCD_4x40::writeByte(char value) {
+    _d = value >> 4;
+    wait_us(40); // most instructions take 40us
+    _e = 0;
+    wait_us(40);
+    _e = 1;
+    _d = value >> 0;
+    wait_us(40);
+    _e = 0;
+    wait_us(40);  // most instructions take 40us
+    _e = 1;
+}
+
+void TextLCD_4x40::writeCommand(char command) {
+    _rs = 0;
+    writeByte(command);
+}
+
+void TextLCD_4x40::writeData(char data) {
+    _rs = 1;
+    writeByte(data);
+}
+
+char TextLCD_4x40::address(char column, char row) {   
+            return 0x80 + (row * 0x40) + column;
+}