Luka Danilovic / ELEC351_LIBRARY

Contains necessary classes and functions for ELEC351

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displayMaster/displayMaster.cpp@3:e84fa53173e6, 2017-12-28 (annotated)

Committer:
Luka_Danilovic
Date:
Thu Dec 28 12:14:53 2017 +0000
Revision:
3:e84fa53173e6
Child:
4:d463eafbabed
ELEC315 Library by student 10497267

Who changed what in which revision?

UserRevisionLine numberNew contents of line
Luka_Danilovic 3:e84fa53173e6 1 #include "mbed.h"
Luka_Danilovic 3:e84fa53173e6 2 #include "displayMaster.hpp"
Luka_Danilovic 3:e84fa53173e6 3
Luka_Danilovic 3:e84fa53173e6 4 /* Instructions on using the 16x2 LCD panel are found here:
Luka_Danilovic 3:e84fa53173e6 5 [https://www.8051projects.net/lcd-interfacing/lcd-4-bit.php] */
Luka_Danilovic 3:e84fa53173e6 6
Luka_Danilovic 3:e84fa53173e6 7 /* N.B. This class contains blocking function */
Luka_Danilovic 3:e84fa53173e6 8
Luka_Danilovic 3:e84fa53173e6 9 C_displayMaster::C_displayMaster(PinName D1, PinName D2, PinName D3 , PinName D4 , PinName RS , PinName RW, PinName EN)
Luka_Danilovic 3:e84fa53173e6 10 :
Luka_Danilovic 3:e84fa53173e6 11 _commsBus(D1, D2, D3, D4),
Luka_Danilovic 3:e84fa53173e6 12 _registerSel(RS),
Luka_Danilovic 3:e84fa53173e6 13 _modeSel(RW),
Luka_Danilovic 3:e84fa53173e6 14 _enable(EN)
Luka_Danilovic 3:e84fa53173e6 15 {
Luka_Danilovic 3:e84fa53173e6 16 _enable = DISABLE; // DISABLE at start
Luka_Danilovic 3:e84fa53173e6 17 _commsBus[3].output(); // Reconfigure pin as output (MSB)
Luka_Danilovic 3:e84fa53173e6 18 Thread::wait(20); // Powerup time
Luka_Danilovic 3:e84fa53173e6 19 _commsBus = 0x03; // Pannel config instruction 1
Luka_Danilovic 3:e84fa53173e6 20 _enable = ENABLE; // Validate instruction
Luka_Danilovic 3:e84fa53173e6 21 _enable = DISABLE;
Luka_Danilovic 3:e84fa53173e6 22 Thread::wait(15); // Wait since BUSY flag not available yet
Luka_Danilovic 3:e84fa53173e6 23 _commsBus = 0x03; // Pannel config instruction 2
Luka_Danilovic 3:e84fa53173e6 24 _enable = ENABLE; // Validate instruction
Luka_Danilovic 3:e84fa53173e6 25 _enable = DISABLE;
Luka_Danilovic 3:e84fa53173e6 26 Thread::wait(5); // Wait since BUSY flag not available yet
Luka_Danilovic 3:e84fa53173e6 27 _commsBus = 0x03; // Pannel config instruction 3
Luka_Danilovic 3:e84fa53173e6 28 _enable = ENABLE; // Validate instruction
Luka_Danilovic 3:e84fa53173e6 29 _enable = DISABLE;
Luka_Danilovic 3:e84fa53173e6 30 Thread::wait(2); // Wait since BUSY flag not available yet
Luka_Danilovic 3:e84fa53173e6 31 _commsBus = 0x02; // Pannel config instruction (4 bit mode)
Luka_Danilovic 3:e84fa53173e6 32 _enable = ENABLE; // Validate instruction
Luka_Danilovic 3:e84fa53173e6 33 _enable = DISABLE;
Luka_Danilovic 3:e84fa53173e6 34 Thread::wait(2); // Wait since BUSY flag not available yet
Luka_Danilovic 3:e84fa53173e6 35 writeChar(0x28, INSTRUCTION); // Function Set: 4-bit, 2 Line, 5x7 Dots
Luka_Danilovic 3:e84fa53173e6 36 writeChar(0x01, INSTRUCTION); // Clear Display (also clear DDRAM content)
Luka_Danilovic 3:e84fa53173e6 37 writeChar(0x0C, INSTRUCTION); // Display = on, Cursor = off
Luka_Danilovic 3:e84fa53173e6 38 writeChar(0x06, INSTRUCTION); // Entry Mode (Auto increment)
Luka_Danilovic 3:e84fa53173e6 39
Luka_Danilovic 3:e84fa53173e6 40 writeChar(0x23, DATA);
Luka_Danilovic 3:e84fa53173e6 41
Luka_Danilovic 3:e84fa53173e6 42 }
Luka_Danilovic 3:e84fa53173e6 43
Luka_Danilovic 3:e84fa53173e6 44 void C_displayMaster::busyCheck()
Luka_Danilovic 3:e84fa53173e6 45 {
Luka_Danilovic 3:e84fa53173e6 46 _enable = DISABLE; // DISABLE at start
Luka_Danilovic 3:e84fa53173e6 47 _commsBus[3].input(); // Input to listen for BUSY flag (MSB)
Luka_Danilovic 3:e84fa53173e6 48 _registerSel = INSTRUCTION; // Comunicate with INSTRUCTION register
Luka_Danilovic 3:e84fa53173e6 49 _modeSel = READ; // READ from register
Luka_Danilovic 3:e84fa53173e6 50 _enable = ENABLE; // Listen for BUSY flag
Luka_Danilovic 3:e84fa53173e6 51 while(_commsBus[3]) {
Luka_Danilovic 3:e84fa53173e6 52 _enable != _enable; // Repeat read while BUSY flag is set
Luka_Danilovic 3:e84fa53173e6 53 }
Luka_Danilovic 3:e84fa53173e6 54 _enable = DISABLE; // Leave DISABLED upon exit
Luka_Danilovic 3:e84fa53173e6 55 _modeSel = WRITE; // Return to WRITE mode
Luka_Danilovic 3:e84fa53173e6 56 _commsBus[3].output(); // Reconfigure pin as output (MSB)
Luka_Danilovic 3:e84fa53173e6 57 }
Luka_Danilovic 3:e84fa53173e6 58
Luka_Danilovic 3:e84fa53173e6 59 void C_displayMaster::writeChar(char instructions, bool REGISTER)
Luka_Danilovic 3:e84fa53173e6 60 {
Luka_Danilovic 3:e84fa53173e6 61 _enable = DISABLE; // DISABLE at start
Luka_Danilovic 3:e84fa53173e6 62 _commsBus[3].output(); // Reconfigure pin as output (MSB)
Luka_Danilovic 3:e84fa53173e6 63 _registerSel = REGISTER; // Chose register to comunicate with
Luka_Danilovic 3:e84fa53173e6 64 _modeSel = WRITE; // WRITE to register
Luka_Danilovic 3:e84fa53173e6 65 _commsBus = (instructions>>4);// Top nibble
Luka_Danilovic 3:e84fa53173e6 66 _enable = ENABLE; // validate signal
Luka_Danilovic 3:e84fa53173e6 67 busyCheck();
Luka_Danilovic 3:e84fa53173e6 68 _commsBus = (instructions); // Bottom nibble
Luka_Danilovic 3:e84fa53173e6 69 _enable = ENABLE; // validate signal
Luka_Danilovic 3:e84fa53173e6 70 busyCheck();
Luka_Danilovic 3:e84fa53173e6 71 }