Diff: TextLCD.cpp

Revision:

9:05c9b97e4a91

Parent:

7:44f34c09bd37

diff -r 308d188a2d3a -r 05c9b97e4a91 TextLCD.cpp
--- a/TextLCD.cpp	Thu Jan 02 21:07:01 2014 +0000
+++ b/TextLCD.cpp	Mon Jul 02 17:58:56 2018 +0000
@@ -19,51 +19,60 @@
  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  * THE SOFTWARE.
  */
-
+ 
 #include "TextLCD.h"
 #include "mbed.h"
-
-TextLCD::TextLCD(PinName rs, PinName e, PinName d4, PinName d5,
-                 PinName d6, PinName d7, LCDType type) : _rs(rs),
-        _e(e), _d(d4, d5, d6, d7),
-        _type(type) {
-
-    _e  = 1;
+ 
+TextLCD::TextLCD(PinName rs, PinName rw, PinName e, PinName d0, PinName d1,
+                 PinName d2, PinName d3, LCDType type) : _rs(rs), _rw(rw),
+        _e(e), _d(d0, d1, d2, d3), _type(type) {
     _rs = 0;            // command mode
-
-    wait(0.015);        // Wait 15ms to ensure powered up
-
+    _rw = 0;
+    _e  = 0;            
+    _d.output();        // data out
+ 
+    wait(0.05);        // Wait 50ms 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
-    }
-    writeByte(0x2);     // 4-bit mode
-    wait(0.000040f);    // 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();
+        _e = 1;
+        wait(0.000001f);
+        _d = 0x3;
+        wait(0.000001f); 
+        _e = 0;
+        wait(0.004f); // 4ms
+       }
+    _e = 1;
+    wait(0.000001f);
+    _d = 0x2;           // 4 Bit mode
+    wait(0.000001f); 
+    _e = 0;
+    
+    writeCommand(0x28); // Function set 4 Bit, 2Line, 5*7
+    writeCommand(0x08); // Display off
+    writeCommand(0x01); // clear Display
+    writeCommand(0x04); // cursor right, Display is not shifted
+    writeCommand(0x0C); // Display on , Cursor off 
 }
-
+ 
 void TextLCD::character(int column, int row, int c) {
     int a = address(column, row);
     writeCommand(a);
     writeData(c);
 }
-
+ 
 void TextLCD::cls() {
     writeCommand(0x01); // cls, and set cursor to 0
-    wait(0.00164f);     // This command takes 1.64 ms
     locate(0, 0);
 }
-
+ 
 void TextLCD::locate(int column, int row) {
     _column = column;
     _row = row;
 }
-
+ 
+ 
+ 
 int TextLCD::_putc(int value) {
     if (value == '\n') {
         _column = 0;
@@ -84,34 +93,92 @@
     }
     return value;
 }
-
+ 
 int TextLCD::_getc() {
-    return -1;
+    int a = address(_column, _row);
+    writeCommand(a);
+    return (readData());
 }
-
+ 
 void TextLCD::writeByte(int value) {
+    _e = 1;
+    wait(0.000001f);    
     _d = value >> 4;
-    wait(0.000040f); // most instructions take 40us
+    wait(0.000001f);
     _e = 0;
-    wait(0.000040f);
+    wait(0.000001f);
     _e = 1;
+    wait(0.000001f);
     _d = value >> 0;
-    wait(0.000040f);
+    wait(0.000001f);
     _e = 0;
-    wait(0.000040f);  // most instructions take 40us
-    _e = 1;
 }
-
+ 
 void TextLCD::writeCommand(int command) {
+    waitBusy();  // check if display is ready 
     _rs = 0;
     writeByte(command);
 }
-
+ 
+int TextLCD::readData(){
+    int input;
+    waitBusy();
+    _rw = 1;
+    _rs = 1;
+     wait(0.000001f);
+    _d.input();  // switch Data port to input
+    _e = 1;
+    wait(0.000001f);
+    input = _d.read() << 4; // high nibble
+    _e = 0;
+     wait(0.000001f);
+    _e = 1;
+    wait(0.000001f);
+    input = input | _d.read(); // low nibble
+    _e = 0;   
+    return (input);
+}
+ 
+ void TextLCD::waitBusy(){
+    int input;
+    _rw = 1;
+    _rs = 0;
+    wait(0.000001f);
+    _d.input();      // switch Data port to input
+    do{ 
+        _e = 1;
+        wait(0.000001f);
+        input = _d.read();              
+        _e = 0;
+        wait(0.000001f);
+        _e = 1;
+        wait(0.000001f);  
+        _e = 0;
+       }while((0x8 & input) == 0x8);  // wait until display is ready
+    _rw = 0;
+    _d.output();      // switch port back to output  
+ }
+ 
 void TextLCD::writeData(int data) {
+    waitBusy();
     _rs = 1;
     writeByte(data);
 }
-
+ 
+ 
+// set user defined char 
+void  TextLCD::writeCGRAM(int address, int pattern[8]){
+    int i;
+    address = address & 0x07;  //max 8 char
+    for(i=0;i<8;i++){
+        waitBusy();  // check if display is ready 
+        _rs = 0;
+        writeByte(0x40 + address * 8 + i);
+        writeData(pattern[i]);
+        }
+}   
+        
+ 
 int TextLCD::address(int column, int row) {
     switch (_type) {
         case LCD20x4:
@@ -133,7 +200,7 @@
             return 0x80 + (row * 0x40) + column;
     }
 }
-
+ 
 int TextLCD::columns() {
     switch (_type) {
         case LCD20x4:
@@ -145,7 +212,7 @@
             return 16;
     }
 }
-
+ 
 int TextLCD::rows() {
     switch (_type) {
         case LCD20x4:
@@ -156,4 +223,4 @@
         default:
             return 2;
     }
-}
+}
\ No newline at end of file