Revision 9:496c520855a1, committed 2018-01-08

Comitter:

ritarosakai

Date:

Mon Jan 08 07:21:35 2018 +0000

Parent:

8:308d188a2d3a

Child:

10:cec91d426d65

Commit message:

Added lcd.start()

Changed in this revision

--- a/TextLCD.cpp	Thu Jan 02 21:07:01 2014 +0000
+++ b/TextLCD.cpp	Mon Jan 08 07:21:35 2018 +0000
@@ -25,9 +25,13 @@
 
 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(e), _d(d4, d5, d6, d7),
+    _type(type)
+{
+}
 
+void TextLCD::start()
+{
     _e  = 1;
     _rs = 0;            // command mode
 
@@ -47,24 +51,44 @@
     cls();
 }
 
-void TextLCD::character(int column, int row, int c) {
+void TextLCD::character(int column, int row, int c)
+{
     int a = address(column, row);
     writeCommand(a);
     writeData(c);
 }
 
-void TextLCD::cls() {
+void TextLCD::cls()
+{
+    _e  = 1;
+    _rs = 0;            // command mode
+
+    wait(0.015);        // 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
+    }
+    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
     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) {
+void TextLCD::locate(int column, int row)
+{
     _column = column;
     _row = row;
 }
 
-int TextLCD::_putc(int value) {
+int TextLCD::_putc(int value)
+{
     if (value == '\n') {
         _column = 0;
         _row++;
@@ -85,11 +109,13 @@
     return value;
 }
 
-int TextLCD::_getc() {
+int TextLCD::_getc()
+{
     return -1;
 }
 
-void TextLCD::writeByte(int value) {
+void TextLCD::writeByte(int value)
+{
     _d = value >> 4;
     wait(0.000040f); // most instructions take 40us
     _e = 0;
@@ -102,17 +128,20 @@
     _e = 1;
 }
 
-void TextLCD::writeCommand(int command) {
+void TextLCD::writeCommand(int command)
+{
     _rs = 0;
     writeByte(command);
 }
 
-void TextLCD::writeData(int data) {
+void TextLCD::writeData(int data)
+{
     _rs = 1;
     writeByte(data);
 }
 
-int TextLCD::address(int column, int row) {
+int TextLCD::address(int column, int row)
+{
     switch (_type) {
         case LCD20x4:
             switch (row) {
@@ -134,7 +163,8 @@
     }
 }
 
-int TextLCD::columns() {
+int TextLCD::columns()
+{
     switch (_type) {
         case LCD20x4:
         case LCD20x2:
@@ -146,7 +176,8 @@
     }
 }
 
-int TextLCD::rows() {
+int TextLCD::rows()
+{
     switch (_type) {
         case LCD20x4:
             return 4;

--- a/TextLCD.h	Thu Jan 02 21:07:01 2014 +0000
+++ b/TextLCD.h	Mon Jan 08 07:21:35 2018 +0000
@@ -32,15 +32,16 @@
  * @code
  * #include "mbed.h"
  * #include "TextLCD.h"
- * 
+ *
  * TextLCD lcd(p10, p12, p15, p16, p29, p30); // rs, e, d4-d7
- * 
+ *
  * int main() {
  *     lcd.printf("Hello World!\n");
  * }
  * @endcode
  */
-class TextLCD : public Stream {
+class TextLCD : public Stream
+{
 public:
 
     /** LCD panel format */
@@ -84,7 +85,7 @@
 
     /** Clear the screen and locate to 0,0 */
     void cls();
-
+    void start();
     int rows();
     int columns();