LCD.cpp

00001 #include "LCD.hpp"
00002 #include "DataTypes.hpp"
00003 
00004 //LCD data sheet: https://www.rapidonline.com/pdf/57-2224.pdf
00005 
00006 void LCD::INIT()
00007 {
00008     //All lines default low
00009     _LCD_RS = 0;
00010     _LCD_E  = 0;
00011     
00012     //LCD Initialise
00013     wait_ms(45); //Wait for LCD startup
00014     /*Step 1*/
00015         wait_us(40);      //Wait whilst LCD busy
00016         _LCD_RS = control;   
00017         LCD_DDRAM = 0;  //Clear data line
00018         LCD_DDRAM = (FUNC|bit8)>>4;  //Put data on line
00019         LCD_strobe();
00020     
00021     /*Step 2*/ cmdLCD(FUNC|lines2);  //Function Set 0x20|0x08 = 0x28
00022     /*Step 3*/ cmdLCD(FUNC|lines2);  //Function Set 0x20|0x08 = 0x28
00023     /*Step 4*/ cmdLCD(DISPLAY|on);    //Display Control 0x08|0x0x04 = 0x0c
00024     /*Step 5*/ cmdLCD(CLEAR);         //Clear Display 0x01
00025     /*Step 6*/ cmdLCD(ENTRYMODE|I);   //Set entry mode 0x04|0x02 = 0x06
00026 
00027     cmdLCD(RETURN); //return home location
00028 }
00029 
00030 void LCD::clear()
00031 {
00032     cmdLCD(CLEAR);   
00033 }
00034 
00035 void LCD::display(BYTE* str, UINT_16 location)
00036 {
00037     if(location != NULL)
00038     {
00039         pos(location);
00040     }
00041     U_BYTE p = 0;
00042     while((str[p]!= NULL)&&(p<16))
00043     {
00044         putt(str[p]);
00045         p++; 
00046     }
00047 }
00048 
00049 void LCD::pos(UINT_16 location)
00050 {
00051     cmdLCD(0x80|location);   
00052 }
00053 
00054 void LCD::putt(U_BYTE c)
00055 {
00056     wait_us(3000);
00057     _LCD_RS = text;
00058     set_LCD_data(c);
00059 }
00060 
00061 void LCD::cmdLCD(U_BYTE cmd)
00062 {
00063     wait_us(3000);      //Wait whilst LCD busy
00064     _LCD_RS = control;   
00065     set_LCD_data(cmd);  //set data on bus
00066 }
00067 
00068 void LCD::LCD_strobe(void)
00069 {
00070     wait_us(10);
00071     _LCD_E = 1;
00072     wait_us(10);
00073     _LCD_E = 0;
00074 }
00075 
00076 void LCD::set_LCD_data(U_BYTE d)
00077 {
00078     // Send upper 4 bits then lower for bits
00079     // e.g. 11110000 => 1111 -> 0000
00080     
00081     LCD_DDRAM = 0;  //Clear data line
00082     LCD_DDRAM = d>>4;  //Put data on line
00083     LCD_strobe();
00084     wait_us(1000);
00085     LCD_DDRAM = 0;  //Clear
00086     LCD_DDRAM = d; //Put remaining data on line
00087     LCD_strobe();   
00088 }
00089 
00090 void LCD::enableCursor()
00091 {
00092     cmdLCD(DISPLAY|on|cursor);
00093 }
00094 
00095 void LCD::disableCursor()
00096 {
00097     cmdLCD(DISPLAY|on);
00098 }