Make I2C address configurable for HD44780 LCD variations
Also add a basic README with some pointers on how to connect and configure the LCDs
This commit is contained in:
Tony Corbett G0WFV
parent
ef0ebb4d49
commit
ce367f73cb
8
Conf.cpp
8
Conf.cpp
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@ -130,6 +130,7 @@ m_tftSerialBrightness(50U),
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m_hd44780Rows(2U),
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m_hd44780Columns(16U),
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m_hd44780Pins(),
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m_hd44780i2cAddress,
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m_hd44780PWM(false),
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m_hd44780PWMPin(),
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m_hd44780PWMBright(),
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@ -438,6 +439,8 @@ bool CConf::read()
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m_hd44780Rows = (unsigned int)::atoi(value);
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else if (::strcmp(key, "Columns") == 0)
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m_hd44780Columns = (unsigned int)::atoi(value);
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else if (::strcmp(key, "I2CAddress") == 0)
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m_hd44780i2cAddress = value;
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else if (::strcmp(key, "PWM") == 0)
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m_hd44780PWM = ::atoi(value) == 1;
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else if (::strcmp(key, "PWMPin") == 0)
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@ -889,6 +892,11 @@ std::vector<unsigned int> CConf::getHD44780Pins() const
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return m_hd44780Pins;
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}
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std::string CConf::getHD44780i2cAddress() const
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{
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return m_hd44780i2cAddress;
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}
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bool CConf::getHD44780PWM() const
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{
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return m_hd44780PWM;
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2
Conf.h
2
Conf.h
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@ -137,6 +137,7 @@ public:
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unsigned int getHD44780Rows() const;
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unsigned int getHD44780Columns() const;
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std::vector<unsigned int> getHD44780Pins() const;
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std::string getHD44780i2cAddress() const;
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bool getHD44780PWM() const;
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unsigned int getHD44780PWMPin() const;
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unsigned int getHD44780PWMBright() const;
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@ -252,6 +253,7 @@ private:
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unsigned int m_hd44780Rows;
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unsigned int m_hd44780Columns;
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std::vector<unsigned int> m_hd44780Pins;
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std::string m_hd44780i2cAddress;
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bool m_hd44780PWM;
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unsigned int m_hd44780PWMPin;
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unsigned int m_hd44780PWMBright;
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@ -36,7 +36,7 @@ char m_buffer2[128U];
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char m_buffer3[128U];
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char m_buffer4[128U];
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CHD44780::CHD44780(unsigned int rows, unsigned int cols, const std::string& callsign, unsigned int dmrid, const std::vector<unsigned int>& pins, bool pwm, unsigned int pwmPin, unsigned int pwmBright, unsigned int pwmDim, bool displayClock, bool utc, bool duplex) :
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CHD44780::CHD44780(unsigned int rows, unsigned int cols, const std::string& callsign, unsigned int dmrid, const std::vector<unsigned int>& pins, const std::string& i2cAddress, bool pwm, unsigned int pwmPin, unsigned int pwmBright, unsigned int pwmDim, bool displayClock, bool utc, bool duplex) :
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CDisplay(),
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m_rows(rows),
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m_cols(cols),
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@ -48,6 +48,7 @@ m_d0(pins.at(2U)),
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m_d1(pins.at(3U)),
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m_d2(pins.at(4U)),
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m_d3(pins.at(5U)),
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m_i2cAddress(i2cAddress),
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m_pwm(pwm),
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m_pwmPin(pwmPin),
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m_pwmBright(pwmBright),
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@ -239,7 +240,7 @@ bool CHD44780::open()
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void CHD44780::adafruitLCDSetup()
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{
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// The other control pins are initialised with lcdInit()
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::mcp23017Setup(AF_BASE, MCP23017);
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::mcp23017Setup(AF_BASE, m_i2caddress);
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// Backlight LEDs
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::pinMode(AF_RED, OUTPUT);
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@ -311,7 +312,7 @@ void CHD44780::adafruitLCDColour(ADAFRUIT_COLOUR colour)
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void CHD44780::pcf8574LCDSetup()
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{
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// Initalize PFC8574
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::pcf8574Setup(AF_BASE, PCF8574);
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::pcf8574Setup(AF_BASE, m_i2cAddress);
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// Turn on backlight
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::pinMode (AF_BL, OUTPUT);
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@ -67,7 +67,7 @@ enum ADAFRUIT_COLOUR {
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#define AF_ON LOW
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#define AF_OFF HIGH
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#define MCP23017 0x20
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// #define MCP23017 0x20
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#endif
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// Define for HD44780 connected via a PCF8574 GPIO extender
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@ -83,13 +83,13 @@ enum ADAFRUIT_COLOUR {
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#define AF_D2 (AF_BASE + 6)
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#define AF_D3 (AF_BASE + 7)
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#define PCF8574 0x27
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// #define PCF8574 0x27
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#endif
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class CHD44780 : public CDisplay
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{
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public:
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CHD44780(unsigned int rows, unsigned int cols, const std::string& callsign, unsigned int dmrid, const std::vector<unsigned int>& pins, bool pwm, unsigned int pwmPin, unsigned int pwmBright, unsigned int pwmDim, bool displayClock, bool utc, bool duplex);
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CHD44780(unsigned int rows, unsigned int cols, const std::string& callsign, unsigned int dmrid, const std::vector<unsigned int>& pins, const std::string& i2cAddress, bool pwm, unsigned int pwmPin, unsigned int pwmBright, unsigned int pwmDim, bool displayClock, bool utc, bool duplex);
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virtual ~CHD44780();
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virtual bool open();
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@ -123,6 +123,7 @@ private:
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unsigned int m_d1;
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unsigned int m_d2;
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unsigned int m_d3;
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std::string m_i2cAddress;
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bool m_pwm;
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unsigned int m_pwmPin;
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unsigned int m_pwmBright;
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@ -107,15 +107,20 @@ Brightness=50
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[HD44780]
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Rows=2
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Columns=16
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# For basic HD44780 displays (4-bit connection)
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# rs, strb, d0, d1, d2, d3
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# For basic HD44780 displays
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Pins=11,10,0,1,2,3
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# Device address for I2C
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I2CAddress=0x20
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# PWM backlight
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PWM=0
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PWMPin=21
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PWMBright=100
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PWMDim=16
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DisplayClock=1
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UTC=0
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@ -875,6 +875,7 @@ void CMMDVMHost::createDisplay()
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unsigned int rows = m_conf.getHD44780Rows();
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unsigned int columns = m_conf.getHD44780Columns();
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std::vector<unsigned int> pins = m_conf.getHD44780Pins();
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std::string i2cAddress = m_conf.getHD44780i2cAddress();
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bool pwm = m_conf.getHD44780PWM();
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unsigned int pwmPin = m_conf.getHD44780PWMPin();
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unsigned int pwmBright = m_conf.getHD44780PWMBright();
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@ -898,7 +899,7 @@ void CMMDVMHost::createDisplay()
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if (displayClock)
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LogInfo(" Display UTC: %s", utc ? "yes" : "no");
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m_display = new CHD44780(rows, columns, m_callsign, dmrid, pins, pwm, pwmPin, pwmBright, pwmDim, displayClock, utc, m_duplex);
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m_display = new CHD44780(rows, columns, m_callsign, dmrid, pins, i2cAddress, pwm, pwmPin, pwmBright, pwmDim, displayClock, utc, m_duplex);
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}
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#endif
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#if defined(OLED)
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46
README.HD44780
Normal file
46
README.HD44780
Normal file
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@ -0,0 +1,46 @@
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- HD44780 LCD SUPPORT -
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Support for the HD44780 LCD is via the wiringPi library available at
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http://wiringpi.com/download-and-install/ which must be installed in all cases.
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The HD44780 in 4-bit mode is probably the most common connection method and
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wiring details can be found at http://wiringpi.com/dev-lib/lcd-library/
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To compile MMDVMHost with support for the HD44780 use the following commands.
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# cp Makefile.Pi.HD44780 Makefile
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# make clean
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# make
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Other HD44780 variations exist that connect via I2C. Support is also via
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wiringPi, but to compile for each I2C device requires a different Makefile
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depending on the IC attached to the LCD.
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- ADAFRUIT RGB LCD SHIELD -
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The Adafruit RGB LCD Shield is available from https://www.adafruit.com/product/714
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I2C is via the MCP23017 IC and is enabled with Makefile.Pi.Adafruit. The
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I2C device address in MMDVM.ini should be set to 0x20.
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- PCF8574 IC -
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HD44780 LCDs connected via a PCF8574 Remote 8-Bit I/O Expander are available on
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eBay for very little money! This IC uses Makefile.Pi.PCF8574 and the I2C
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device address should be set to 0x27.
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- BEWARE -
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The I2C device address can be manually configured on some devices!
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- CHECK YOUR ACTUAL DEVICE ADDRESS -
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More information on configuring and using I2C on the RPi including how to probe
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the I2C bus for device addresses can be found at
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https://learn.sparkfun.com/tutorials/raspberry-pi-spi-and-i2c-tutorial#i2c-on-pi
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- PWM BACKLIGHT CONTROL -
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Whilst connected in 4-bit mode or via the PCF8574 IC, the LED backlight can be
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wired for control via PWM. Connect the backlight +ve pin to any spare GPIO pin
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and configure MMDVM.ini as appropriate. By default, wiringPi pin 21 is
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configured.
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