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Support for HD44780 via PCF8574

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This commit is contained in:
Tony Corbett G0WFV 2016-06-27 18:48:13 +01:00
parent 084e39c1de
commit 04b297de20
3 changed files with 85 additions and 8 deletions
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36
HD44780.cpp
View file

@ -206,12 +206,16 @@ bool CHD44780::open()
adafruitLCDSetup();
#endif
#ifdef PCF8574_DISPLAY
pcf8574LCDSetup();
#endif
m_fd = ::lcdInit(m_rows, m_cols, 4, m_rb, m_strb, m_d0, m_d1, m_d2, m_d3, 0, 0, 0, 0);
if (m_fd == -1) {
LogError("Unable to open the HD44780");
return false;
}
::lcdDisplay(m_fd, 1);
::lcdCursor(m_fd, 0);
::lcdCursorBlink(m_fd, 0);
@ -296,6 +300,36 @@ void CHD44780::adafruitLCDColour(ADAFRUIT_COLOUR colour)
}
#endif
#ifdef PCF8574_DISPLAY
void CHD44780::pcf8574LCDSetup()
{
// Initalize PFC8574
::pcf8574Setup(AF_BASE, PCF8574);
// Initialise LCD
m_fd = ::lcdInit(m_rows, m_cols, 4, AF_RS, AF_E, AF_D1, AF_D2, AF_D3, AF_D4, 0, 0, 0, 0);
if (m_fd == -1) {
LogError("Unable to open the HD44780 via I2C");
return false;
}
m_rb = AF_RS;
m_strb = AF_E;
m_d0 = AF_D1;
m_d1 = AF_D2;
m_d2 = AF_D3;
m_d3 = AF_D4;
// Turn on backlight
::pinMode (AF_BL, OUTPUT);
::digitalWrite (AF_BL, 1);
// Set LCD to write mode.
::pinMode (AF_RW, OUTPUT);
::digitalWrite (AF_RW, 0);
}
#endif
void CHD44780::setIdleInt()
{
m_dmrScrollTimer1.stop(); // Stop the scroll timer on slot 1

33
HD44780.h
View file

@ -26,6 +26,7 @@
#include <vector>
#include <mcp23017.h>
#include <pcf8574.h>
enum ADAFRUIT_COLOUR {
AC_OFF,
@ -40,14 +41,28 @@ enum ADAFRUIT_COLOUR {
// Defines for the Adafruit Pi LCD interface board
#ifdef ADAFRUIT_DISPLAY
#define AF_BASE 100
#define AF_RED (AF_BASE + 6)
#define AF_GREEN (AF_BASE + 7)
#define AF_BLUE (AF_BASE + 8)
#define AF_RW (AF_BASE + 14)
#define AF_ON LOW
#define AF_BASE 100
#define AF_RED (AF_BASE + 6)
#define AF_GREEN (AF_BASE + 7)
#define AF_BLUE (AF_BASE + 8)
#define AF_RW (AF_BASE + 14)
#define AF_ON LOW
#define AF_OFF HIGH
#define MCP23017 0x20
#define MCP23017 0x20
#endif
// Define for HD44780 connected via a PCF8574 GPIO extender
#ifdef PCF8574_DISPLAY
#define AF_BASE 100
#define AF_RS (AF_BASE + 0)
#define AF_RW (AF_BASE + 1)
#define AF_E (AF_BASE + 2)
#define AF_BL (AF_BASE + 3)
#define AF_D1 (AF_BASE + 4)
#define AF_D2 (AF_BASE + 5)
#define AF_D3 (AF_BASE + 6)
#define AF_D4 (AF_BASE + 7)
#define PCF8547 0x27
#endif
class CHD44780 : public CDisplay
@ -105,6 +120,10 @@ private:
void adafruitLCDSetup();
void adafruitLCDColour(ADAFRUIT_COLOUR colour);
#endif
#ifdef PCF8574_DISPLAY
void pcf8574LCDSetup();
#endif
};
#endif

24
Makefile.Pi.PCF8574 Normal file
View file

@ -0,0 +1,24 @@
+# This makefile is for use with the Raspberry Pi when using an HD44780 compatible display. The wiringpi library is needed.
+# Support for the HD44780 connected via a PCF8574 8-bit GPIO expander IC
+CC = gcc
+CXX = g++
+CFLAGS = -g -O3 -Wall -std=c++0x -pthread -DHD44780 -DPCF8574_DISPLAY -I/usr/local/include
+LIBS = -lwiringPi -lwiringPiDev -lpthread
+LDFLAGS = -g -L/usr/local/lib
+
+OBJECTS = \
+ AMBEFEC.o BPTC19696.o Conf.o CRC.o Display.o DMRControl.o DMRCSBK.o DMRData.o DMRDataHeader.o DMREMB.o DMREmbeddedLC.o DMRFullLC.o DMRIPSC.o DMRLookup.o DMRLC.o \
+ DMRShortLC.o DMRSlot.o DMRSlotType.o DStarControl.o DStarHeader.o DStarNetwork.o DStarSlowData.o Golay2087.o Golay24128.o Hamming.o HD44780.o Log.o MMDVMHost.o \
+ Modem.o Nextion.o NullDisplay.o QR1676.o RS129.o SerialController.o SHA256.o StopWatch.o Sync.o TFTSerial.o Thread.o Timer.o UDPSocket.o Utils.o YSFControl.o \
+ YSFConvolution.o YSFFICH.o YSFNetwork.o YSFPayload.o
+
+all: MMDVMHost
+
+MMDVMHost: $(OBJECTS)
+ $(CXX) $(OBJECTS) $(CFLAGS) $(LIBS) -o MMDVMHost
+
+%.o: %.cpp
+ $(CXX) $(CFLAGS) -c -o $@ $<
+
+clean:
+ $(RM) MMDVMHost *.o *.d *.bak *~