Diff: LCD.cpp

Revision:

0:4ccd12e1d789

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/LCD.cpp	Tue Jan 08 16:21:39 2019 +0000
@@ -0,0 +1,107 @@
+/*------------------------------------------------------------------------------
+Creator : Ben Gordon
+Date : 
+Module : ELEC351
+Project : ELEC351_GroupA
+Dependencies : 
+Purpose : 
+------------------------------------------------------------------------------*/
+#include "LCD.hpp"
+#include "General.hpp"
+
+//LCD data sheet: https://www.rapidonline.com/pdf/57-2224.pdf
+
+void LCD::INIT()
+{
+    //All lines default low
+    _LCD_RS = 0;
+    _LCD_E  = 0;
+    
+    //LCD Initialise
+    wait_ms(45); //Wait for LCD startup
+    /*Step 1*/
+        wait_us(40);      //Wait whilst LCD busy
+        _LCD_RS = control;   
+        LCD_DDRAM = 0;  //Clear data line
+        LCD_DDRAM = (FUNC|bit8)>>4;  //Put data on line
+        LCD_strobe();
+    
+    /*Step 2*/ cmdLCD(FUNC|lines2);  //Function Set 0x20|0x08 = 0x28
+    /*Step 3*/ cmdLCD(FUNC|lines2);  //Function Set 0x20|0x08 = 0x28
+    /*Step 4*/ cmdLCD(DISPLAY|on);    //Display Control 0x08|0x0x04 = 0x0c
+    /*Step 5*/ cmdLCD(CLEAR);         //Clear Display 0x01
+    /*Step 6*/ cmdLCD(ENTRYMODE|I);   //Set entry mode 0x04|0x02 = 0x06
+
+    cmdLCD(RETURN); //return home location
+}
+
+void LCD::clear()
+{
+    cmdLCD(CLEAR);
+    disableCursor();  
+}
+
+void LCD::display(BYTE* str, UINT_16 location)
+{
+    if(location != NULL)
+    {
+        pos(location);
+    }
+    U_BYTE p = 0;
+    while((str[p]!= NULL)&&(p<16))
+    {
+        putt(str[p]);
+        p++; 
+    }
+}
+
+void LCD::pos(UINT_16 location)
+{
+    cmdLCD(0x80|location);   
+}
+
+void LCD::putt(U_BYTE c)
+{
+    wait_us(3000);
+    _LCD_RS = text;
+    set_LCD_data(c);
+}
+
+void LCD::cmdLCD(U_BYTE cmd)
+{
+    wait_us(3000);      //Wait whilst LCD busy
+    _LCD_RS = control;   
+    set_LCD_data(cmd);  //set data on bus
+}
+
+void LCD::LCD_strobe(void)
+{
+    wait_us(10);
+    _LCD_E = 1;
+    wait_us(10);
+    _LCD_E = 0;
+}
+
+void LCD::set_LCD_data(U_BYTE d)
+{
+    // Send upper 4 bits then lower for bits
+    // e.g. 11110000 => 1111 -> 0000
+    
+    LCD_DDRAM = 0;  //Clear data line
+    LCD_DDRAM = d>>4;  //Put data on line
+    LCD_strobe();
+    wait_us(1000);
+    LCD_DDRAM = 0;  //Clear
+    LCD_DDRAM = d; //Put remaining data on line
+    LCD_strobe();   
+}
+
+void LCD::enableCursor()
+{
+    cmdLCD(DISPLAY|on|cursor);
+}
+
+void LCD::disableCursor()
+{
+    cmdLCD(DISPLAY|on);
+}