16*2Lcd Display
Dependents: CITY1082-i2c_master
Diff: TextLCD.cpp
- Revision:
- 21:9eb628d9e164
- Parent:
- 20:e0da005a777f
- Child:
- 22:35742ec80c24
diff -r e0da005a777f -r 9eb628d9e164 TextLCD.cpp --- a/TextLCD.cpp Mon May 13 19:29:13 2013 +0000 +++ b/TextLCD.cpp Tue Apr 01 21:30:25 2014 +0000 @@ -7,6 +7,7 @@ * 2013, v05: WH, Added support for 8x2B, added some UDCs * 2013, v06: WH, Added support for devices that use internal DC/DC converters * 2013, v07: WH, Added support for backlight and include portdefinitions for LCD2004 Module from DFROBOT + * 2014, v08: WH, Refactored in Base in Derived Classes to deal with mbed lib change regarding 'NC' defined pins * * Permission is hereby granted, free of charge, to any person obtaining a copy * of this software and associated documentation files (the "Software"), to deal @@ -30,105 +31,23 @@ #include "TextLCD.h" #include "mbed.h" - -/* Create a TextLCD interface for using regular mbed pins - * - * @param rs Instruction/data control line - * @param e Enable line (clock) - * @param d4-d7 Data lines for using as a 4-bit interface - * @param type Sets the panel size/addressing mode (default = LCD16x2) - * @param bl Backlight control line (optional, default = NC) - * @param e2 Enable2 line (clock for second controller, LCD40x4 only) - * @param ctrl LCD controller (default = HD44780) - */ -TextLCD::TextLCD(PinName rs, PinName e, - PinName d4, PinName d5, PinName d6, PinName d7, - LCDType type, PinName bl, PinName e2, LCDCtrl ctrl) : _rs(rs), _e(e), _bl(bl), _e2(e2), - _d(d4, d5, d6, d7), - _cs(NC), - _type(type), - _ctrl(ctrl) { - - _busType = _PinBus; - - _init(); - -} - -/* Create a TextLCD interface using an I2C PC8574 portexpander - * - * @param i2c I2C Bus - * @param deviceAddress I2C slave address (PCF8574) - * @param type Sets the panel size/addressing mode (default = LCD16x2) - * @param ctrl LCD controller (default = HD44780) - */ -TextLCD::TextLCD(I2C *i2c, char deviceAddress, LCDType type, LCDCtrl ctrl) : - _rs(NC), _e(NC), _bl(NC), _e2(NC), - _d(NC), - _i2c(i2c), - _cs(NC), - _type(type), - _ctrl(ctrl) { - - _slaveAddress = deviceAddress; - _busType = _I2CBus; - - - // Init the portexpander bus - _lcd_bus = D_LCD_BUS_DEF; - - // write the new data to the portexpander - _i2c->write(_slaveAddress, &_lcd_bus, 1); - - _init(); - -} - - /* Create a TextLCD interface using an SPI 74595 portexpander +/** Create a TextLCD_Base interface * - * @param spi SPI Bus - * @param cs chip select pin (active low) - * @param type Sets the panel size/addressing mode (default = LCD16x2) - * @param ctrl LCD controller (default = HD44780) + * @param type Sets the panel size/addressing mode (default = LCD16x2) + * @param ctrl LCD controller (default = HD44780) */ -TextLCD::TextLCD(SPI *spi, PinName cs, LCDType type, LCDCtrl ctrl) : - _rs(NC), _e(NC), _bl(NC), _e2(NC), - _d(NC), - _spi(spi), - _cs(cs), - _type(type), - _ctrl(ctrl) { - - _busType = _SPIBus; - - // Setup the spi for 8 bit data, low steady state clock, - // rising edge capture, with a 500KHz or 1MHz clock rate - _spi->format(8,0); - _spi->frequency(500000); - //_spi.frequency(1000000); - - - // Init the portexpander bus - _lcd_bus = D_LCD_BUS_DEF; - - // write the new data to the portexpander - _setCS(false); - _spi->write(_lcd_bus); - _setCS(true); - - _init(); - +TextLCD_Base::TextLCD_Base(LCDType type, LCDCtrl ctrl) : _type(type), _ctrl(ctrl) { } -/* Init the LCD Controller(s) - * Clear display - */ -void TextLCD::_init() { +/** Init the LCD Controller(s) + * Clear display + */ +void TextLCD_Base::_init() { // Select and configure second LCD controller when needed if(_type==LCD40x4) { - _ctrl_idx=TextLCD::_LCDCtrl_1; // Select 2nd controller + _ctrl_idx=_LCDCtrl_1; // Select 2nd controller _initCtrl(); // Init 2nd controller @@ -140,7 +59,7 @@ } // Select and configure primary LCD controller - _ctrl_idx=TextLCD::_LCDCtrl_0; // Select primary controller + _ctrl_idx=_LCDCtrl_0; // Select primary controller _initCtrl(); // Init primary controller @@ -152,13 +71,13 @@ } -/* Init the LCD controller - * 4-bit mode, number of lines, fonttype, no cursor etc - * - */ -void TextLCD::_initCtrl() { +/** Init the LCD controller + * 4-bit mode, number of lines, fonttype, no cursor etc + * + */ +void TextLCD_Base::_initCtrl() { - _setRS(false); // command mode + this->_setRS(false); // command mode wait_ms(20); // Wait 20ms to ensure powered up @@ -275,20 +194,21 @@ // _writeCommand(0x0C); // Display Ctrl 0000 1 D C B // // Display On, Cursor Off, Blink Off - setCursor(TextLCD::CurOff_BlkOff); - setMode(TextLCD::DispOn); + setCursor(CurOff_BlkOff); + setMode(DispOn); } -// Clear the screen, Cursor home. -void TextLCD::cls() { +/** Clear the screen, Cursor home. + */ +void TextLCD_Base::cls() { // Select and configure second LCD controller when needed if(_type==LCD40x4) { - _ctrl_idx=TextLCD::_LCDCtrl_1; // Select 2nd controller + _ctrl_idx=_LCDCtrl_1; // Select 2nd controller // Second LCD controller Cursor always Off - _setCursorAndDisplayMode(_currentMode, TextLCD::CurOff_BlkOff); + _setCursorAndDisplayMode(_currentMode, CurOff_BlkOff); // Second LCD controller Clearscreen _writeCommand(0x01); // cls, and set cursor to 0 @@ -297,7 +217,7 @@ // Since we are not using the Busy flag, Lets be safe and take 10 ms - _ctrl_idx=TextLCD::_LCDCtrl_0; // Select primary controller + _ctrl_idx=_LCDCtrl_0; // Select primary controller } // Primary LCD controller Clearscreen @@ -315,8 +235,9 @@ _column=0; } -// Move cursor to selected row and column -void TextLCD::locate(int column, int row) { +/** Move cursor to selected row and column + */ +void TextLCD_Base::locate(int column, int row) { // setAddress() does all the heavy lifting: // check column and row sanity, @@ -328,8 +249,9 @@ } -// Write a single character (Stream implementation) -int TextLCD::_putc(int value) { +/** Write a single character (Stream implementation) + */ +int TextLCD_Base::_putc(int value) { int addr; if (value == '\n') { @@ -366,250 +288,19 @@ // get a single character (Stream implementation) -int TextLCD::_getc() { +int TextLCD_Base::_getc() { return -1; } -// Set E pin (or E2 pin) -// Used for mbed pins, I2C bus expander or SPI shifregister -void TextLCD::_setEnable(bool value) { - - switch(_busType) { - case _PinBus : - if(_ctrl_idx==TextLCD::_LCDCtrl_0) { - if (value) - _e = 1; // Set E bit - else - _e = 0; // Reset E bit - } - else { - if (value) - _e2 = 1; // Set E2 bit - else - _e2 = 0; // Reset E2 bit - } - - break; - - case _I2CBus : - - if(_ctrl_idx==TextLCD::_LCDCtrl_0) { - if (value) - _lcd_bus |= D_LCD_E; // Set E bit - else - _lcd_bus &= ~D_LCD_E; // Reset E bit - } - else { - if (value) - _lcd_bus |= D_LCD_E2; // Set E2 bit - else - _lcd_bus &= ~D_LCD_E2; // Reset E2bit - } - - // write the new data to the I2C portexpander - _i2c->write(_slaveAddress, &_lcd_bus, 1); - - break; - - case _SPIBus : - if(_ctrl_idx==TextLCD::_LCDCtrl_0) { - if (value) - _lcd_bus |= D_LCD_E; // Set E bit - else - _lcd_bus &= ~D_LCD_E; // Reset E bit - } - else { - if (value) - _lcd_bus |= D_LCD_E2; // Set E2 bit - else - _lcd_bus &= ~D_LCD_E2; // Reset E2 bit - } - - // write the new data to the SPI portexpander - _setCS(false); - _spi->write(_lcd_bus); - _setCS(true); - - break; - } -} - -// Set RS pin -// Used for mbed pins, I2C bus expander or SPI shifregister -void TextLCD::_setRS(bool value) { - - switch(_busType) { - case _PinBus : - if (value) - _rs = 1; // Set RS bit - else - _rs = 0; // Reset RS bit - - break; - - case _I2CBus : - if (value) - _lcd_bus |= D_LCD_RS; // Set RS bit - else - _lcd_bus &= ~D_LCD_RS; // Reset RS bit - - // write the new data to the I2C portexpander - _i2c->write(_slaveAddress, &_lcd_bus, 1); - - break; - - case _SPIBus : - if (value) - _lcd_bus |= D_LCD_RS; // Set RS bit - else - _lcd_bus &= ~D_LCD_RS; // Reset RS bit - - // write the new data to the SPI portexpander - _setCS(false); - _spi->write(_lcd_bus); - _setCS(true); - - break; - } - -} - -// Set BL pin -// Used for mbed pins, I2C bus expander or SPI shifregister -void TextLCD::_setBL(bool value) { - - switch(_busType) { - case _PinBus : - if (value) - _bl = 1; // Set BL bit - else - _bl = 0; // Reset BL bit - - break; - - case _I2CBus : - if (value) - _lcd_bus |= D_LCD_BL; // Set BL bit - else - _lcd_bus &= ~D_LCD_BL; // Reset BL bit - - // write the new data to the I2C portexpander - _i2c->write(_slaveAddress, &_lcd_bus, 1); - - break; - - case _SPIBus : - if (value) - _lcd_bus |= D_LCD_BL; // Set BL bit - else - _lcd_bus &= ~D_LCD_BL; // Reset BL bit - - // write the new data to the SPI portexpander - _setCS(false); - _spi->write(_lcd_bus); - _setCS(true); - - break; - } - -} - - - -// Place the 4bit data on the databus -// Used for mbed pins, I2C bus expander or SPI shifregister -void TextLCD::_setData(int value) { - int data; - - switch(_busType) { - case _PinBus : - _d = value & 0x0F; // Write Databits - - break; - - case _I2CBus : - data = value & 0x0F; - if (data & 0x01) - _lcd_bus |= D_LCD_D4; // Set Databit - else - _lcd_bus &= ~D_LCD_D4; // Reset Databit - - if (data & 0x02) - _lcd_bus |= D_LCD_D5; // Set Databit - else - _lcd_bus &= ~D_LCD_D5; // Reset Databit - - if (data & 0x04) - _lcd_bus |= D_LCD_D6; // Set Databit - else - _lcd_bus &= ~D_LCD_D6; // Reset Databit - - if (data & 0x08) - _lcd_bus |= D_LCD_D7; // Set Databit - else - _lcd_bus &= ~D_LCD_D7; // Reset Databit - - // write the new data to the I2C portexpander - _i2c->write(_slaveAddress, &_lcd_bus, 1); - - break; - - case _SPIBus : - - data = value & 0x0F; - if (data & 0x01) - _lcd_bus |= D_LCD_D4; // Set Databit - else - _lcd_bus &= ~D_LCD_D4; // Reset Databit - - if (data & 0x02) - _lcd_bus |= D_LCD_D5; // Set Databit - else - _lcd_bus &= ~D_LCD_D5; // Reset Databit - - if (data & 0x04) - _lcd_bus |= D_LCD_D6; // Set Databit - else - _lcd_bus &= ~D_LCD_D6; // Reset Databit - - if (data & 0x08) - _lcd_bus |= D_LCD_D7; // Set Databit - else - _lcd_bus &= ~D_LCD_D7; // Reset Databit - - // write the new data to the SPI portexpander - _setCS(false); - _spi->write(_lcd_bus); - _setCS(true); - - break; - } - -} - - -// Set CS line. -// Only used for SPI bus -void TextLCD::_setCS(bool value) { - - if (value) { - _cs = 1; // Set CS pin - } - else - _cs = 0; // Reset CS pin - -} - // Write a nibble using the 4-bit interface -// Used for mbed pins, I2C bus expander or SPI shifregister -void TextLCD::_writeNibble(int value) { +void TextLCD_Base::_writeNibble(int value) { // Enable is Low - _setEnable(true); - _setData(value & 0x0F); // Low nibble + this->_setEnable(true); + this->_setData(value & 0x0F); // Low nibble wait_us(1); // Data setup time - _setEnable(false); + this->_setEnable(false); wait_us(1); // Datahold time // Enable is Low @@ -618,41 +309,42 @@ // Write a byte using the 4-bit interface -// Used for mbed pins, I2C bus expander or SPI shifregister -void TextLCD::_writeByte(int value) { +void TextLCD_Base::_writeByte(int value) { // Enable is Low - _setEnable(true); - _setData(value >> 4); // High nibble + this->_setEnable(true); + this->_setData(value >> 4); // High nibble wait_us(1); // Data setup time - _setEnable(false); + this->_setEnable(false); wait_us(1); // Data hold time - _setEnable(true); - _setData(value >> 0); // Low nibble + this->_setEnable(true); + this->_setData(value >> 0); // Low nibble wait_us(1); // Data setup time - _setEnable(false); + this->_setEnable(false); wait_us(1); // Datahold time // Enable is Low } -void TextLCD::_writeCommand(int command) { +// Write a command byte to the LCD controller +void TextLCD_Base::_writeCommand(int command) { - _setRS(false); + this->_setRS(false); wait_us(1); // Data setup time for RS - _writeByte(command); + this->_writeByte(command); wait_us(40); // most instructions take 40us } -void TextLCD::_writeData(int data) { +// Write a data byte to the LCD controller +void TextLCD_Base::_writeData(int data) { - _setRS(true); + this->_setRS(true); wait_us(1); // Data setup time for RS - _writeByte(data); + this->_writeByte(data); wait_us(40); // data writes take 40us } @@ -662,7 +354,7 @@ // It is confusing since it returns the memoryaddress or-ed with the set memorycommand 0x80. // Left it in here for compatibility with older code. New applications should use getAddress() instead. // -int TextLCD::_address(int column, int row) { +int TextLCD_Base::_address(int column, int row) { switch (_type) { case LCD20x4: switch (row) { @@ -688,13 +380,13 @@ // This replaces the original _address() method. // Left it in here for compatibility with older code. New applications should use getAddress() instead. -int TextLCD::_address(int column, int row) { +int TextLCD_Base::_address(int column, int row) { return 0x80 | getAddress(column, row); } // This is new method to return the memory address based on row, column and displaytype. // -int TextLCD::getAddress(int column, int row) { +int TextLCD_Base::getAddress(int column, int row) { switch (_type) { case LCD8x1: @@ -784,7 +476,7 @@ if (_ctrl_idx != _LCDCtrl_0) { // Second LCD controller Cursor Off - _setCursorAndDisplayMode(_currentMode, TextLCD::CurOff_BlkOff); + _setCursorAndDisplayMode(_currentMode, CurOff_BlkOff); // Select primary controller _ctrl_idx = _LCDCtrl_0; @@ -800,7 +492,7 @@ // Test to see if we need to switch between controllers if (_ctrl_idx != _LCDCtrl_1) { // Primary LCD controller Cursor Off - _setCursorAndDisplayMode(_currentMode, TextLCD::CurOff_BlkOff); + _setCursorAndDisplayMode(_currentMode, CurOff_BlkOff); // Select secondary controller _ctrl_idx = _LCDCtrl_1; @@ -821,7 +513,7 @@ // Set row, column and update memoryaddress. // -void TextLCD::setAddress(int column, int row) { +void TextLCD_Base::setAddress(int column, int row) { // Sanity Check column if (column < 0) { @@ -848,7 +540,7 @@ _writeCommand(0x80 | addr); } -int TextLCD::columns() { +int TextLCD_Base::columns() { switch (_type) { case LCD8x1: case LCD8x2: @@ -883,7 +575,7 @@ } } -int TextLCD::rows() { +int TextLCD_Base::rows() { switch (_type) { case LCD8x1: case LCD16x1: @@ -914,7 +606,7 @@ // Set the Cursor Mode (Cursor Off & Blink Off, Cursor On & Blink Off, Cursor Off & Blink On, Cursor On & Blink On -void TextLCD::setCursor(TextLCD::LCDCursor cursorMode) { +void TextLCD_Base::setCursor(LCDCursor cursorMode) { // Save new cursor mode, needed when 2 controllers are in use or when display is switched off/on _currentCursor = cursorMode; @@ -925,35 +617,35 @@ } // Set the Displaymode (On/Off) -void TextLCD::setMode(TextLCD::LCDMode displayMode) { +void TextLCD_Base::setMode(LCDMode displayMode) { // Save new displayMode, needed when 2 controllers are in use or when cursor is changed _currentMode = displayMode; // Select and configure second LCD controller when needed if(_type==LCD40x4) { - if (_ctrl_idx==TextLCD::_LCDCtrl_0) { + if (_ctrl_idx==_LCDCtrl_0) { // Configure primary LCD controller _setCursorAndDisplayMode(_currentMode, _currentCursor); // Select 2nd controller - _ctrl_idx=TextLCD::_LCDCtrl_1; + _ctrl_idx=_LCDCtrl_1; // Configure secondary LCD controller - _setCursorAndDisplayMode(_currentMode, TextLCD::CurOff_BlkOff); + _setCursorAndDisplayMode(_currentMode, CurOff_BlkOff); // Restore current controller - _ctrl_idx=TextLCD::_LCDCtrl_0; + _ctrl_idx=_LCDCtrl_0; } else { // Select primary controller - _ctrl_idx=TextLCD::_LCDCtrl_0; + _ctrl_idx=_LCDCtrl_0; // Configure primary LCD controller - _setCursorAndDisplayMode(_currentMode, TextLCD::CurOff_BlkOff); + _setCursorAndDisplayMode(_currentMode, CurOff_BlkOff); // Restore current controller - _ctrl_idx=TextLCD::_LCDCtrl_1; + _ctrl_idx=_LCDCtrl_1; // Configure secondary LCD controller _setCursorAndDisplayMode(_currentMode, _currentCursor); @@ -969,38 +661,38 @@ // Set the Displaymode (On/Off) and Cursortype for current controller -void TextLCD::_setCursorAndDisplayMode(TextLCD::LCDMode displayMode, TextLCD::LCDCursor cursorType) { +void TextLCD_Base::_setCursorAndDisplayMode(LCDMode displayMode, LCDCursor cursorType) { // Configure current LCD controller _writeCommand(0x08 | displayMode | cursorType); } // Set the Backlight mode (Off/On) -void TextLCD::setBacklight(TextLCD::LCDBacklight backlightMode) { +void TextLCD_Base::setBacklight(LCDBacklight backlightMode) { if (backlightMode == LightOn) { - _setBL(true); + this->_setBL(true); } else { - _setBL(false); + this->_setBL(false); } } -void TextLCD::setUDC(unsigned char c, char *udc_data) { +void TextLCD_Base::setUDC(unsigned char c, char *udc_data) { // Select and configure second LCD controller when needed if(_type==LCD40x4) { _LCDCtrl_Idx current_ctrl_idx = _ctrl_idx; // Temp save current controller // Select primary controller - _ctrl_idx=TextLCD::_LCDCtrl_0; + _ctrl_idx=_LCDCtrl_0; // Configure primary LCD controller _setUDC(c, udc_data); // Select 2nd controller - _ctrl_idx=TextLCD::_LCDCtrl_1; + _ctrl_idx=_LCDCtrl_1; // Configure secondary LCD controller _setUDC(c, udc_data); @@ -1015,7 +707,7 @@ } -void TextLCD::_setUDC(unsigned char c, char *udc_data) { +void TextLCD_Base::_setUDC(unsigned char c, char *udc_data) { // Select CG RAM for current LCD controller _writeCommand(0x40 + ((c & 0x07) << 3)); //Set CG-RAM address, @@ -1030,3 +722,350 @@ _writeCommand(0x80 | addr); } + + +///------------------------------------------------------------------- + + +/* Create a TextLCD interface for using regular mbed pins + * + * @param rs Instruction/data control line + * @param e Enable line (clock) + * @param d4-d7 Data lines for using as a 4-bit interface + * @param type Sets the panel size/addressing mode (default = LCD16x2) + * @param bl Backlight control line (optional, default = NC) + * @param e2 Enable2 line (clock for second controller, LCD40x4 only) + * @param ctrl LCD controller (default = HD44780) + */ +TextLCD::TextLCD(PinName rs, PinName e, + PinName d4, PinName d5, PinName d6, PinName d7, + LCDType type, PinName bl, PinName e2, LCDCtrl ctrl) : + TextLCD_Base(type, ctrl), + _rs(rs), _e(e), _bl(bl), _e2(e2), + _d(d4, d5, d6, d7) { + + _init(); + +} + +// Set E pin (or E2 pin) +// Used for mbed pins, I2C bus expander or SPI shiftregister +void TextLCD::_setEnable(bool value) { + + if(_ctrl_idx==_LCDCtrl_0) { + if (value) + _e = 1; // Set E bit + else + _e = 0; // Reset E bit + } + else { + if (value) + _e2 = 1; // Set E2 bit + else + _e2 = 0; // Reset E2 bit + } + +} + +// Set RS pin +// Used for mbed pins, I2C bus expander or SPI shiftregister +void TextLCD::_setRS(bool value) { + + if (value) + _rs = 1; // Set RS bit + else + _rs = 0; // Reset RS bit + +} + +// Set BL pin +// Used for mbed pins, I2C bus expander or SPI shiftregister +void TextLCD::_setBL(bool value) { + + if (value) + _bl = 1; // Set BL bit + else + _bl = 0; // Reset BL bit + +} + + + +// Place the 4bit data on the databus +// Used for mbed pins, I2C bus expander or SPI shifregister +void TextLCD::_setData(int value) { + _d = value & 0x0F; // Write Databits +} + + + + +///---------------------------------------------------------------------------------------- + + +/* Create a TextLCD interface using an I2C PC8574 portexpander + * + * @param i2c I2C Bus + * @param deviceAddress I2C slave address (PCF8574) + * @param type Sets the panel size/addressing mode (default = LCD16x2) + * @param ctrl LCD controller (default = HD44780) + */ +TextLCD_I2C::TextLCD_I2C(I2C *i2c, char deviceAddress, LCDType type, LCDCtrl ctrl) : + TextLCD_Base(type, ctrl), + _i2c(i2c){ + + _slaveAddress = deviceAddress; + + // Init the portexpander bus + _lcd_bus = D_LCD_BUS_DEF; + + // write the new data to the portexpander + _i2c->write(_slaveAddress, &_lcd_bus, 1); + + _init(); + +} + +// Set E pin (or E2 pin) +// Used for mbed pins, I2C bus expander or SPI shiftregister +void TextLCD_I2C::_setEnable(bool value) { + + if(_ctrl_idx==_LCDCtrl_0) { + if (value) + _lcd_bus |= D_LCD_E; // Set E bit + else + _lcd_bus &= ~D_LCD_E; // Reset E bit + } + else { + if (value) + _lcd_bus |= D_LCD_E2; // Set E2 bit + else + _lcd_bus &= ~D_LCD_E2; // Reset E2bit + } + + // write the new data to the I2C portexpander + _i2c->write(_slaveAddress, &_lcd_bus, 1); + +} + +// Set RS pin +// Used for mbed pins, I2C bus expander or SPI shiftregister +void TextLCD_I2C::_setRS(bool value) { + + if (value) + _lcd_bus |= D_LCD_RS; // Set RS bit + else + _lcd_bus &= ~D_LCD_RS; // Reset RS bit + + // write the new data to the I2C portexpander + _i2c->write(_slaveAddress, &_lcd_bus, 1); + +} + +// Set BL pin +// Used for mbed pins, I2C bus expander or SPI shiftregister +void TextLCD_I2C::_setBL(bool value) { + + if (value) + _lcd_bus |= D_LCD_BL; // Set BL bit + else + _lcd_bus &= ~D_LCD_BL; // Reset BL bit + + // write the new data to the I2C portexpander + _i2c->write(_slaveAddress, &_lcd_bus, 1); + +} + + + +// Place the 4bit data on the databus +// Used for mbed pins, I2C bus expander or SPI shifregister +void TextLCD_I2C::_setData(int value) { + int data; + + data = value & 0x0F; + if (data & 0x01) + _lcd_bus |= D_LCD_D4; // Set Databit + else + _lcd_bus &= ~D_LCD_D4; // Reset Databit + + if (data & 0x02) + _lcd_bus |= D_LCD_D5; // Set Databit + else + _lcd_bus &= ~D_LCD_D5; // Reset Databit + + if (data & 0x04) + _lcd_bus |= D_LCD_D6; // Set Databit + else + _lcd_bus &= ~D_LCD_D6; // Reset Databit + + if (data & 0x08) + _lcd_bus |= D_LCD_D7; // Set Databit + else + _lcd_bus &= ~D_LCD_D7; // Reset Databit + + // write the new data to the I2C portexpander + _i2c->write(_slaveAddress, &_lcd_bus, 1); + + +} + + + + + +///------------------------------------------------------------------------------------ + + + + + + +// TextLCD_SPI Implementation + + + /* Create a TextLCD interface using an SPI 74595 portexpander + * + * @param spi SPI Bus + * @param cs chip select pin (active low) + * @param type Sets the panel size/addressing mode (default = LCD16x2) + * @param ctrl LCD controller (default = HD44780) + */ +TextLCD_SPI::TextLCD_SPI(SPI *spi, PinName cs, LCDType type, LCDCtrl ctrl) : + TextLCD_Base(type, ctrl), + _spi(spi), + _cs(cs) { + + // Setup the spi for 8 bit data, low steady state clock, + // rising edge capture, with a 500KHz or 1MHz clock rate + _spi->format(8,0); + _spi->frequency(500000); + //_spi.frequency(1000000); + + + // Init the portexpander bus + _lcd_bus = D_LCD_BUS_DEF; + + // write the new data to the portexpander + _setCS(false); + _spi->write(_lcd_bus); + _setCS(true); + + _init(); + +} + +// Set E pin (or E2 pin) +// Used for mbed pins, I2C bus expander or SPI shiftregister +void TextLCD_SPI::_setEnable(bool value) { + + if(_ctrl_idx==_LCDCtrl_0) { + if (value) + _lcd_bus |= D_LCD_E; // Set E bit + else + _lcd_bus &= ~D_LCD_E; // Reset E bit + } + else { + if (value) + _lcd_bus |= D_LCD_E2; // Set E2 bit + else + _lcd_bus &= ~D_LCD_E2; // Reset E2 bit + } + + // write the new data to the SPI portexpander + _setCS(false); + _spi->write(_lcd_bus); + _setCS(true); + +} + +// Set RS pin +// Used for mbed pins, I2C bus expander or SPI shiftregister +void TextLCD_SPI::_setRS(bool value) { + + if (value) + _lcd_bus |= D_LCD_RS; // Set RS bit + else + _lcd_bus &= ~D_LCD_RS; // Reset RS bit + + // write the new data to the SPI portexpander + _setCS(false); + _spi->write(_lcd_bus); + _setCS(true); + +} + +// Set BL pin +// Used for mbed pins, I2C bus expander or SPI shiftregister +void TextLCD_SPI::_setBL(bool value) { + + if (value) + _lcd_bus |= D_LCD_BL; // Set BL bit + else + _lcd_bus &= ~D_LCD_BL; // Reset BL bit + + // write the new data to the SPI portexpander + _setCS(false); + _spi->write(_lcd_bus); + _setCS(true); + +} + + + +// Place the 4bit data on the databus +// Used for mbed pins, I2C bus expander or SPI shiftregister +void TextLCD_SPI::_setData(int value) { + int data; + + data = value & 0x0F; + if (data & 0x01) + _lcd_bus |= D_LCD_D4; // Set Databit + else + _lcd_bus &= ~D_LCD_D4; // Reset Databit + + if (data & 0x02) + _lcd_bus |= D_LCD_D5; // Set Databit + else + _lcd_bus &= ~D_LCD_D5; // Reset Databit + + if (data & 0x04) + _lcd_bus |= D_LCD_D6; // Set Databit + else + _lcd_bus &= ~D_LCD_D6; // Reset Databit + + if (data & 0x08) + _lcd_bus |= D_LCD_D7; // Set Databit + else + _lcd_bus &= ~D_LCD_D7; // Reset Databit + + // write the new data to the SPI portexpander + _setCS(false); + _spi->write(_lcd_bus); + _setCS(true); + +} + + +// Set CS line. +// Only used for SPI bus +void TextLCD_SPI::_setCS(bool value) { + + if (value) { + _cs = 1; // Set CS pin + } + else + _cs = 0; // Reset CS pin + +} + + + + + + + + + + +