Diff: displayMaster/displayMaster.cpp

Revision:

3:e84fa53173e6

Child:

4:d463eafbabed

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/displayMaster/displayMaster.cpp	Thu Dec 28 12:14:53 2017 +0000
@@ -0,0 +1,71 @@
+#include "mbed.h"
+#include "displayMaster.hpp"
+
+/* Instructions on using the 16x2 LCD panel are found here:
+[https://www.8051projects.net/lcd-interfacing/lcd-4-bit.php] */
+
+/* N.B. This class contains blocking function */
+
+C_displayMaster::C_displayMaster(PinName D1, PinName D2, PinName D3 , PinName D4 , PinName RS , PinName RW, PinName EN)
+    :
+    _commsBus(D1, D2, D3, D4),
+    _registerSel(RS),
+    _modeSel(RW),
+    _enable(EN)
+{
+    _enable      = DISABLE;          // DISABLE at start
+    _commsBus[3].output();           // Reconfigure pin as output (MSB)
+    Thread::wait(20);                // Powerup time
+    _commsBus = 0x03;                // Pannel config instruction 1
+    _enable      = ENABLE;           // Validate instruction
+    _enable      = DISABLE;
+    Thread::wait(15);                // Wait since BUSY flag not available yet
+    _commsBus = 0x03;                // Pannel config instruction 2
+    _enable      = ENABLE;           // Validate instruction
+    _enable      = DISABLE;
+    Thread::wait(5);                 // Wait since BUSY flag not available yet
+    _commsBus = 0x03;                // Pannel config instruction 3
+    _enable      = ENABLE;           // Validate instruction
+    _enable      = DISABLE;
+    Thread::wait(2);                 // Wait since BUSY flag not available yet
+    _commsBus = 0x02;                // Pannel config instruction (4 bit mode)
+    _enable      = ENABLE;           // Validate instruction
+    _enable      = DISABLE;
+    Thread::wait(2);                 // Wait since BUSY flag not available yet
+    writeChar(0x28, INSTRUCTION);    // Function Set: 4-bit, 2 Line, 5x7 Dots
+    writeChar(0x01, INSTRUCTION);    // Clear Display (also clear DDRAM content)
+    writeChar(0x0C, INSTRUCTION);    // Display = on, Cursor = off
+    writeChar(0x06, INSTRUCTION);    // Entry Mode (Auto increment)
+    
+    writeChar(0x23, DATA);
+
+}
+
+void C_displayMaster::busyCheck()
+{
+    _enable      = DISABLE;          // DISABLE at start
+    _commsBus[3].input();            // Input to listen for BUSY flag (MSB)
+    _registerSel = INSTRUCTION;      // Comunicate with INSTRUCTION register
+    _modeSel     = READ;             // READ from register
+    _enable      = ENABLE;           // Listen for BUSY flag
+    while(_commsBus[3]) {
+        _enable != _enable;          // Repeat read while BUSY flag is set
+    }
+    _enable      = DISABLE;          // Leave DISABLED upon exit
+    _modeSel     = WRITE;            // Return to WRITE mode
+    _commsBus[3].output();           // Reconfigure pin as output (MSB)
+}
+
+void C_displayMaster::writeChar(char instructions, bool REGISTER)
+{
+    _enable      = DISABLE;          // DISABLE at start
+    _commsBus[3].output();           // Reconfigure pin as output (MSB)
+    _registerSel = REGISTER;         // Chose register to comunicate with
+    _modeSel     = WRITE;            // WRITE to register
+    _commsBus    = (instructions>>4);// Top nibble
+    _enable      = ENABLE;           // validate signal
+    busyCheck();
+    _commsBus    = (instructions);   // Bottom nibble
+    _enable      = ENABLE;           // validate signal
+    busyCheck();
+}
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