MASAJI EGAWA / TextLCD

Modified TextLCD lib. The RW signal is also connected to a IO pin. This enable to read out the display memory and the busy flag. The timing is switched from delays to wait for the busy flag. Added writeCGRAM function to define user chars 0-7.

Fork of TextLCD by Peter Drescher

Files at this revision

API Documentation at this revision

Revision 4:a7c74d4c6911, committed 2010-12-14

Comitter:
dreschpe
Date:
Tue Dec 14 16:47:47 2010 +0000
Parent:
3:8582013914a0
Commit message:
0.2 change small delays to __nop();

Changed in this revision

TextLCD.cpp Show annotated file Show diff for this revision Revisions of this file 
--- a/TextLCD.cpp	Mon Dec 06 00:07:57 2010 +0000
+++ b/TextLCD.cpp	Tue Dec 14 16:47:47 2010 +0000
@@ -36,16 +36,16 @@
     // send "Display Settings" 3 times (Only top nibble of 0x30 as we've got 4-bit bus)
     for (int i=0; i<3; i++) {
         _e = 1;
-        wait(0.000001f);
+        __nop();
         _d = 0x3;
-        wait(0.000001f); 
+        __nop();
         _e = 0;
         wait(0.004f); // 4ms
        }
     _e = 1;
-    wait(0.000001f);
+    __nop();
     _d = 0x2;           // 4 Bit mode
-    wait(0.000001f); 
+    __nop(); 
     _e = 0;
     
     writeCommand(0x28); // Function set 4 Bit, 2Line, 5*7
@@ -102,15 +102,15 @@
 
 void TextLCD::writeByte(int value) {
     _e = 1;
-    wait(0.000001f);    
+    __nop();    
     _d = value >> 4;
-    wait(0.000001f);
+    __nop();
     _e = 0;
-    wait(0.000001f);
+    __nop();
     _e = 1;
-    wait(0.000001f);
+    __nop();
     _d = value >> 0;
-    wait(0.000001f);
+    __nop();
     _e = 0;
 }
 
@@ -125,15 +125,15 @@
     waitBusy();
     _rw = 1;
     _rs = 1;
-     wait(0.000001f);
+    __nop();
     _d.input();  // switch Data port to input
     _e = 1;
-    wait(0.000001f);
+    __nop();
     input = _d.read() << 4; // high nibble
     _e = 0;
-     wait(0.000001f);
+    __nop();
     _e = 1;
-    wait(0.000001f);
+    __nop();
     input = input | _d.read(); // low nibble
     _e = 0;   
     return (input);
@@ -143,16 +143,16 @@
     int input;
     _rw = 1;
     _rs = 0;
-    wait(0.000001f);
+    __nop();
     _d.input();      // switch Data port to input
     do{ 
         _e = 1;
-        wait(0.000001f);
+        __nop();
         input = _d.read();              
         _e = 0;
-        wait(0.000001f);
+        __nop();
         _e = 1;
-        wait(0.000001f);  
+        __nop();
         _e = 0;
        }while((0x8 & input) == 0x8);  // wait until display is ready
     _rw = 0;