Pranav Sawant
Oct122012mbedLab
Fork of
TextLCD
by 
Simon Ford
Diff: TextLCD.cpp
- Revision:
- 8:bd49ebdd4f64
- Parent:
- 4:bf5b706f8d32
--- a/TextLCD.cpp Sat May 29 10:15:04 2010 +0000
+++ b/TextLCD.cpp Fri Oct 12 16:02:26 2012 +0000
@@ -1,159 +1,159 @@
-/* mbed TextLCD Library, for a 4-bit LCD based on HD44780
- * Copyright (c) 2007-2010, sford
- *
- * Permission is hereby granted, free of charge, to any person obtaining a copy
- * of this software and associated documentation files (the "Software"), to deal
- * in the Software without restriction, including without limitation the rights
- * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
- * copies of the Software, and to permit persons to whom the Software is
- * furnished to do so, subject to the following conditions:
- *
- * The above copyright notice and this permission notice shall be included in
- * all copies or substantial portions of the Software.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
- * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
- * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
- * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
- * 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 d0, PinName d1,
- PinName d2, PinName d3, LCDType type) : _rs(rs),
- _e(e), _d(d0, d1, d2, d3),
- _type(type) {
-
- _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
- cls();
-}
-
-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;
- _row++;
- if (_row >= rows()) {
- _row = 0;
- }
- } else {
- character(_column, _row, value);
- _column++;
- if (_column >= columns()) {
- _column = 0;
- _row++;
- if (_row >= rows()) {
- _row = 0;
- }
- }
- }
- return value;
-}
-
-int TextLCD::_getc() {
- return -1;
-}
-
-void TextLCD::writeByte(int value) {
- _d = value >> 4;
- wait(0.000040f); // most instructions take 40us
- _e = 0;
- wait(0.000040f);
- _e = 1;
- _d = value >> 0;
- wait(0.000040f);
- _e = 0;
- wait(0.000040f); // most instructions take 40us
- _e = 1;
-}
-
-void TextLCD::writeCommand(int command) {
- _rs = 0;
- writeByte(command);
-}
-
-void TextLCD::writeData(int data) {
- _rs = 1;
- writeByte(data);
-}
-
-int TextLCD::address(int column, int row) {
- switch (_type) {
- case LCD20x4:
- switch (row) {
- case 0:
- return 0x80 + column;
- case 1:
- return 0xc0 + column;
- case 2:
- return 0x94 + column;
- case 3:
- return 0xd4 + column;
- }
- case LCD16x2B:
- return 0x80 + (row * 40) + column;
- case LCD16x2:
- case LCD20x2:
- default:
- return 0x80 + (row * 0x40) + column;
- }
-}
-
-int TextLCD::columns() {
- switch (_type) {
- case LCD20x4:
- case LCD20x2:
- return 20;
- case LCD16x2:
- case LCD16x2B:
- default:
- return 16;
- }
-}
-
-int TextLCD::rows() {
- switch (_type) {
- case LCD20x4:
- return 4;
- case LCD16x2:
- case LCD16x2B:
- case LCD20x2:
- default:
- return 2;
- }
-}
+/* mbed TextLCD Library, for a 4-bit LCD based on HD44780
+ * Copyright (c) 2007-2010, sford
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * 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 d0, PinName d1,
+ PinName d2, PinName d3, LCDType type) : _rs(rs),
+ _e(e), _d(d0, d1, d2, d3),
+ _type(type) {
+
+ _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
+ cls();
+}
+
+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;
+ _row++;
+ if (_row >= rows()) {
+ _row = 0;
+ }
+ } else {
+ character(_column, _row, value);
+ _column++;
+ if (_column >= columns()) {
+ _column = 0;
+ _row++;
+ if (_row >= rows()) {
+ _row = 0;
+ }
+ }
+ }
+ return value;
+}
+
+int TextLCD::_getc() {
+ return -1;
+}
+
+void TextLCD::writeByte(int value) {
+ _d = value >> 4;
+ wait(0.000040f); // most instructions take 40us
+ _e = 0;
+ wait(0.000040f);
+ _e = 1;
+ _d = value >> 0;
+ wait(0.000040f);
+ _e = 0;
+ wait(0.000040f); // most instructions take 40us
+ _e = 1;
+}
+
+void TextLCD::writeCommand(int command) {
+ _rs = 0;
+ writeByte(command);
+}
+
+void TextLCD::writeData(int data) {
+ _rs = 1;
+ writeByte(data);
+}
+
+int TextLCD::address(int column, int row) {
+ switch (_type) {
+ case LCD20x4:
+ switch (row) {
+ case 0:
+ return 0x80 + column;
+ case 1:
+ return 0xc0 + column;
+ case 2:
+ return 0x94 + column;
+ case 3:
+ return 0xd4 + column;
+ }
+ case LCD16x2B:
+ return 0x80 + (row * 40) + column;
+ case LCD16x2:
+ case LCD20x2:
+ default:
+ return 0x80 + (row * 0x40) + column;
+ }
+}
+
+int TextLCD::columns() {
+ switch (_type) {
+ case LCD20x4:
+ case LCD20x2:
+ return 20;
+ case LCD16x2:
+ case LCD16x2B:
+ default:
+ return 16;
+ }
+}
+
+int TextLCD::rows() {
+ switch (_type) {
+ case LCD20x4:
+ return 4;
+ case LCD16x2:
+ case LCD16x2B:
+ case LCD20x2:
+ default:
+ return 2;
+ }
+}