PROJ515 / Mbed OS ELEC-351-GROUP-E-CW

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Dependencies:   BMP280

DriverLCD.cpp@23:a6bb5298346c, 2018-01-10 (annotated)

Committer:
mwthewsey
Date:
Wed Jan 10 02:36:50 2018 +0000
Revision:
23:a6bb5298346c
Added Custom LCD Driver

Who changed what in which revision?

UserRevisionLine numberNew contents of line
mwthewsey 23:a6bb5298346c 1 #include "DriverLCD.h"
mwthewsey 23:a6bb5298346c 2 #include "mbed.h"
mwthewsey 23:a6bb5298346c 3
mwthewsey 23:a6bb5298346c 4 DriverLCD::DriverLCD(PinName rs, PinName e, PinName d4, PinName d5, PinName d6, PinName d7) : _rs(rs),_e(e), _d(d4, d5, d6, d7)
mwthewsey 23:a6bb5298346c 5 {
mwthewsey 23:a6bb5298346c 6
mwthewsey 23:a6bb5298346c 7 _e = 1; //Enable high, rs low to enter command mode
mwthewsey 23:a6bb5298346c 8 _rs = 0;
mwthewsey 23:a6bb5298346c 9
mwthewsey 23:a6bb5298346c 10 wait(0.015); //Wait 15ms for LCD to powerup
mwthewsey 23:a6bb5298346c 11
mwthewsey 23:a6bb5298346c 12 for (int i=0; i<3; i++) { //Send command 3 times
mwthewsey 23:a6bb5298346c 13 LCD_DATA(0x3,INIT);
mwthewsey 23:a6bb5298346c 14 wait(0.002); //Wait 2ms, so wait for it
mwthewsey 23:a6bb5298346c 15 }
mwthewsey 23:a6bb5298346c 16 LCD_DATA(0x2,INIT); //4-bit mode
mwthewsey 23:a6bb5298346c 17 wait(0.000040f); //Wait 40us
mwthewsey 23:a6bb5298346c 18
mwthewsey 23:a6bb5298346c 19 LCD_DATA(0x28,CMD); //Function set. 2 lines, 5x8 dots, 1/16 dusy factor
mwthewsey 23:a6bb5298346c 20 LCD_DATA(0x0C,CMD); //Turn Display on
mwthewsey 23:a6bb5298346c 21 LCD_DATA(0x6,CMD); //Entry mode setting. Standard increment
mwthewsey 23:a6bb5298346c 22 cls(); //Clear display
mwthewsey 23:a6bb5298346c 23 }
mwthewsey 23:a6bb5298346c 24
mwthewsey 23:a6bb5298346c 25 void DriverLCD::cls()
mwthewsey 23:a6bb5298346c 26 {
mwthewsey 23:a6bb5298346c 27 LCD_DATA(0x01,CMD); //Clear display command.
mwthewsey 23:a6bb5298346c 28 wait(0.002); //Wait 2ms
mwthewsey 23:a6bb5298346c 29 locate(0, 0); //Resets cursor to 0,0
mwthewsey 23:a6bb5298346c 30 }
mwthewsey 23:a6bb5298346c 31
mwthewsey 23:a6bb5298346c 32 void DriverLCD::locate(int column, int row)
mwthewsey 23:a6bb5298346c 33 {
mwthewsey 23:a6bb5298346c 34 _column = column; //Set new column and row data to internal variables
mwthewsey 23:a6bb5298346c 35 _row = row;
mwthewsey 23:a6bb5298346c 36 }
mwthewsey 23:a6bb5298346c 37
mwthewsey 23:a6bb5298346c 38 void DriverLCD::LCD_DATA(int data,int command)
mwthewsey 23:a6bb5298346c 39 {
mwthewsey 23:a6bb5298346c 40 if(command == 0) { //CMD = 0, enter command mode
mwthewsey 23:a6bb5298346c 41 _rs = 0;
mwthewsey 23:a6bb5298346c 42 } else if (command == 1) { //STR = 1
mwthewsey 23:a6bb5298346c 43 _rs = 1;
mwthewsey 23:a6bb5298346c 44 }
mwthewsey 23:a6bb5298346c 45
mwthewsey 23:a6bb5298346c 46 _d = data >> 4; //Send most significant nibble first
mwthewsey 23:a6bb5298346c 47 wait(0.00004); //Wait 40us
mwthewsey 23:a6bb5298346c 48 _e = 0; //Clock enable line to put in data
mwthewsey 23:a6bb5298346c 49 wait(0.00004);
mwthewsey 23:a6bb5298346c 50 _e = 1;
mwthewsey 23:a6bb5298346c 51
mwthewsey 23:a6bb5298346c 52 _d = data >> 0; //Send least significant nibble seccond
mwthewsey 23:a6bb5298346c 53 wait(0.00004);
mwthewsey 23:a6bb5298346c 54 _e = 0;
mwthewsey 23:a6bb5298346c 55 wait(0.00004);
mwthewsey 23:a6bb5298346c 56 _e = 1;
mwthewsey 23:a6bb5298346c 57 }
mwthewsey 23:a6bb5298346c 58
mwthewsey 23:a6bb5298346c 59 void DriverLCD::character(int column, int row, int data)
mwthewsey 23:a6bb5298346c 60 {
mwthewsey 23:a6bb5298346c 61 int addr = 0x80 + (row * 0x40) + column; //Calculate address of segment
mwthewsey 23:a6bb5298346c 62 LCD_DATA(addr,CMD); //Move cursor to new address
mwthewsey 23:a6bb5298346c 63 LCD_DATA(data,STR); //Write data
mwthewsey 23:a6bb5298346c 64 }
mwthewsey 23:a6bb5298346c 65
mwthewsey 23:a6bb5298346c 66
mwthewsey 23:a6bb5298346c 67 int DriverLCD::_putc(int data)
mwthewsey 23:a6bb5298346c 68 {
mwthewsey 23:a6bb5298346c 69 if (data == '\n') { //If new line is found, move down a row
mwthewsey 23:a6bb5298346c 70 _column = 0; //Reset to first column
mwthewsey 23:a6bb5298346c 71 _row++; //inc row
mwthewsey 23:a6bb5298346c 72 if (_row >= 2) {//Only two rows on this LCD, move up a row instead.
mwthewsey 23:a6bb5298346c 73 _row = 0;
mwthewsey 23:a6bb5298346c 74 }
mwthewsey 23:a6bb5298346c 75 } else {
mwthewsey 23:a6bb5298346c 76 character(_column, _row, data); //Write char
mwthewsey 23:a6bb5298346c 77 _column++; //Then increment column and row to next location
mwthewsey 23:a6bb5298346c 78 if (_column >= 16) {
mwthewsey 23:a6bb5298346c 79 _column = 0;
mwthewsey 23:a6bb5298346c 80 _row++;
mwthewsey 23:a6bb5298346c 81 if (_row >= 2) {
mwthewsey 23:a6bb5298346c 82 _row = 0;
mwthewsey 23:a6bb5298346c 83 }
mwthewsey 23:a6bb5298346c 84 }
mwthewsey 23:a6bb5298346c 85 }
mwthewsey 23:a6bb5298346c 86 return data;
mwthewsey 23:a6bb5298346c 87 }
mwthewsey 23:a6bb5298346c 88
mwthewsey 23:a6bb5298346c 89 int DriverLCD::_getc()
mwthewsey 23:a6bb5298346c 90 {
mwthewsey 23:a6bb5298346c 91 return -1;
mwthewsey 23:a6bb5298346c 92 }
mwthewsey 23:a6bb5298346c 93
mwthewsey 23:a6bb5298346c 94