TextLCD library for controlling various LCD panels based on the HD44780 4-bit interface (does not contain blocking code)

Fork of TextLCD by Simon Ford

Files at this revision

API Documentation at this revision

Comitter:
abiswas25
Date:
Mon Nov 02 17:52:25 2015 +0000
Parent:
8:308d188a2d3a
Commit message:
Removed wait statements (blocking code) which was causing problems while using with Ticker class (or any other class which prohibits use of blocking code)

Changed in this revision

TextLCD.cpp Show annotated file Show diff for this revision Revisions of this file
diff -r 308d188a2d3a -r 057d7d076a35 TextLCD.cpp
--- a/TextLCD.cpp	Thu Jan 02 21:07:01 2014 +0000
+++ b/TextLCD.cpp	Mon Nov 02 17:52:25 2015 +0000
@@ -31,15 +31,15 @@
     _e  = 1;
     _rs = 0;            // command mode
 
-    wait(0.015);        // Wait 15ms to ensure powered up
+    for(int z=0;z<240000;z++);        // Wait 15ms to ensure powered up
 
     // send "Display Settings" 3 times (Only top nibble of 0x30 as we've got 4-bit bus)
     for (int i=0; i<3; i++) {
         writeByte(0x3);
-        wait(0.00164);  // this command takes 1.64ms, so wait for it
+        for(int z=0;z<78720;z++);  // this command takes 1.64ms, so wait for it
     }
     writeByte(0x2);     // 4-bit mode
-    wait(0.000040f);    // most instructions take 40us
+    for(int z=0;z<1920;z++);    // most instructions take 40us
 
     writeCommand(0x28); // Function set 001 BW N F - -
     writeCommand(0x0C);
@@ -55,7 +55,7 @@
 
 void TextLCD::cls() {
     writeCommand(0x01); // cls, and set cursor to 0
-    wait(0.00164f);     // This command takes 1.64 ms
+    for(int z=0;z<78720;z++);     // This command takes 1.64 ms
     locate(0, 0);
 }
 
@@ -91,14 +91,14 @@
 
 void TextLCD::writeByte(int value) {
     _d = value >> 4;
-    wait(0.000040f); // most instructions take 40us
+    for(int z=0;z<1920;z++); // most instructions take 40us
     _e = 0;
-    wait(0.000040f);
+    for(int z=0;z<1920;z++);
     _e = 1;
     _d = value >> 0;
-    wait(0.000040f);
+    for(int z=0;z<1920;z++);
     _e = 0;
-    wait(0.000040f);  // most instructions take 40us
+    for(int z=0;z<1920;z++);  // most instructions take 40us
     _e = 1;
 }