Diff: display.cpp

Revision:

0:d63a63feb104

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/display.cpp	Tue Jun 10 11:05:23 2014 +0000
@@ -0,0 +1,144 @@
+/* University of York Robotics Laboratory MBED Library: Display Driver
+ * 
+ * File: display.cpp
+ *
+ * (C) Dr James Hilder, Dept. Electronics & Computer Science, University of York
+ * 
+ * October 2013
+ *
+ * Driver for the Midas 20x4 I2C LCD Display (MCCOG42005A6W-BNMLWI) LCD
+ *
+ * Farnell part 2218946 
+ *
+ */ 
+ 
+#include "mbed.h"
+#include "display.h"
+
+Display::Display(PinName sda, PinName scl, PinName reset) :  Stream("display"), _i2c(sda,scl), _reset(reset)  {
+  
+}
+
+Display::Display() :  Stream("display"), _i2c(p9,p10), _reset(p12)  {
+  
+}
+
+int Display::i2c_message(char byte){
+   char bytes [2];
+   bytes[0]=0x80;
+   bytes[1]=byte;
+   return _i2c.write(LCD_ADDRESS,bytes,2);  
+}
+
+int Display::disp_putc(int c){
+   char message [2];
+   message[0]=0x40;
+   message[1]=c;
+   _i2c.write(LCD_ADDRESS,message,2);
+   return c;
+}
+
+
+
+void Display::init_display(){
+   //Set initial states: display on, cursor off
+   display_on = 1;
+   cursor_on = 1;
+   blink_on  = 1;
+    
+   _reset=1;
+   wait(0.02);
+   //Set reset low
+   _reset=0;
+   wait(0.001);
+   _reset=1;
+   wait(0.03);
+   i2c_message(0x3a); 
+   i2c_message(0x1e); 
+   i2c_message(0x39); 
+   i2c_message(0x1c); 
+   i2c_message(0x79); 
+   i2c_message(0x5d); 
+   i2c_message(0x6d); 
+   _set_display();
+   clear_display(); 
+} 
+
+void Display::write_string(char * message, char length){
+   char to_send [length+1];
+   to_send[0]=0x40;
+   for(int i=0;i<length;i++){
+     to_send[i+1] = message[i];
+   }
+   _i2c.write(LCD_ADDRESS,to_send,length+1);
+}
+
+void Display::set_position(char row, char column){
+  if(row < 4 && column < 20){
+    char pos = 128 +((row * 32)+column);
+    i2c_message(pos);
+  }
+}
+
+void Display::set_cursor(char enable){
+  cursor_on=enable;
+  _set_display();
+}
+
+void Display::set_blink(char enable){
+  blink_on=enable;
+    _set_display();
+}
+
+void Display::set_display(char enable){
+  display_on=enable;
+    _set_display();
+}
+
+void Display::clear_display(){
+  i2c_message(0x01);
+}
+
+void Display::home(){
+  i2c_message(0x02);
+}
+
+
+void Display::_set_display(){
+    char mode = 8;
+    if(display_on>0) mode += 4;
+    if(cursor_on>0) mode += 2;
+    if(blink_on>0) mode ++;
+    i2c_message(mode);
+}
+
+
+int Display::_putc (int c) {
+    disp_putc(c);
+    return(c);
+}
+
+int Display::_getc (void) {
+    char r = 0;
+    return(r);
+}
+ 
+ 
+/* 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.
+ */
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