Sai Arunesh V S
/
TextLCD
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Diff: TextLCD.cpp
- Revision:
- 15:b70ebfffb258
- Parent:
- 14:0c32b66b14b8
- Child:
- 16:c276b75e6585
diff -r 0c32b66b14b8 -r b70ebfffb258 TextLCD.cpp
--- a/TextLCD.cpp Sun Feb 10 18:43:51 2013 +0000
+++ b/TextLCD.cpp Tue Feb 19 22:09:09 2013 +0000
@@ -2,6 +2,7 @@
* Copyright (c) 2007-2010, sford, http://mbed.org
* 2013, v01: WH, Added LCD types, fixed LCD address issues, added Cursor and UDCs
* 2013, v02: WH, Added I2C and SPI bus interfaces
+ * 2013, v03: WH, Added support for LCD40x4 which uses 2 controllers
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
@@ -25,13 +26,21 @@
#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 e2 Enable2 line (clock for second controller, LCD40x4 only)
+ */
TextLCD::TextLCD(PinName rs, PinName e,
PinName d4, PinName d5, PinName d6, PinName d7,
- LCDType type): _rs(rs), _e(e),
- _d(d4, d5, d6, d7),
- _cs(NC),
- _type(type) {
-
+ LCDType type, PinName e2) : _rs(rs), _e(e), _e2(e2),
+ _d(d4, d5, d6, d7),
+ _cs(NC),
+ _type(type) {
_busType = _PinBus;
@@ -39,19 +48,25 @@
}
-
+/* 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)
+ */
TextLCD::TextLCD(I2C *i2c, char deviceAddress, LCDType type) :
- _rs(NC), _e(NC), _d(NC),
- _cs(NC),
- _i2c(i2c),
+ _rs(NC), _e(NC), _e2(NC),
+ _d(NC),
+ _i2c(i2c),
+ _cs(NC),
_type(type) {
-
+
_slaveAddress = deviceAddress;
_busType = _I2CBus;
// Init the portexpander bus
- _lcd_bus = 0x80;
+ _lcd_bus = D_LCD_BUS_DEF;
// write the new data to the portexpander
_i2c->write(_slaveAddress, &_lcd_bus, 1);
@@ -60,11 +75,17 @@
}
-
+ /* 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)
+ */
TextLCD::TextLCD(SPI *spi, PinName cs, LCDType type) :
- _rs(NC), _e(NC), _d(NC),
- _spi(spi),
- _cs(cs),
+ _rs(NC), _e(NC), _e2(NC),
+ _d(NC),
+ _spi(spi),
+ _cs(cs),
_type(type) {
_busType = _SPIBus;
@@ -77,7 +98,7 @@
// Init the portexpander bus
- _lcd_bus = 0x80;
+ _lcd_bus = D_LCD_BUS_DEF;
// write the new data to the portexpander
_setCS(false);
@@ -89,47 +110,75 @@
}
-/* Init the LCD controller
- * 4-bit mode, number of lines, no cursor etc
+/* Init the LCD Controller(s)
* Clear display
*/
void TextLCD::_init() {
-// _e = 1;
-// _rs = 0; // command mode
+
+ // Select and configure second LCD controller when needed
+ if(_type==LCD40x4) {
+ _ctrl=TextLCD::_LCDCtrl_1; // Select 2nd controller
+
+ _initCtrl(); // Init 2nd controller
+
+ // Secondary LCD controller Clearscreen
+ _writeCommand(0x01); // cls, and set cursor to 0
+ wait_ms(10); // The CLS command takes 1.64 ms.
+ // Since we are not using the Busy flag, Lets be safe and take 10 ms
+
+ }
+
+ // Select and configure primary LCD controller
+ _ctrl=TextLCD::_LCDCtrl_0; // Select primary controller
- _setEnable(true);
+ _initCtrl(); // Init primary controller
+
+ // Primary LCD controller Clearscreen
+ _writeCommand(0x01); // cls, and set cursor to 0
+
+ wait_ms(10); // The CLS command takes 1.64 ms.
+ // Since we are not using the Busy flag, Lets be safe and take 10 ms
+
+}
+
+/* Init the LCD controller
+ * 4-bit mode, number of lines, fonttype, no cursor etc
+ *
+ */
+void TextLCD::_initCtrl() {
+
_setRS(false); // command mode
-// wait(0.015); // Wait 15ms to ensure powered up
- wait_ms(15); // Wait 15ms to ensure powered up
+ wait_ms(20); // Wait 20ms to ensure powered up
// send "Display Settings" 3 times (Only top nibble of 0x30 as we've got 4-bit bus)
for (int i=0; i<3; i++) {
_writeByte(0x3);
-// wait(0.00164); // this command takes 1.64ms, so wait for it
- wait_ms(10); // this command takes 1.64ms, so wait for it
+ wait_ms(15); // this command takes 1.64ms, so wait for it
}
_writeByte(0x2); // 4-bit mode
-// wait(0.000040f); // most instructions take 40us
wait_us(40); // most instructions take 40us
// Display is now in 4-bit mode
switch (_type) {
case LCD8x1:
- _writeCommand(0x20); // Function set 001 BW N F - -
+ _writeCommand(0x20); // Function set 001 DL N F - -
+ // DL=0 (4 bits bus)
// N=0 (1 line)
// F=0 (5x7 dots font)
break;
case LCD24x4:
// Special mode for KS0078
- _writeCommand(0x2A); // Function set 001 BW N RE DH REV
+ _writeCommand(0x2A); // Function set 001 DL N RE DH REV
+ // DL=0 (4 bits bus)
// N=1 (Dont care for KS0078)
// RE=0 (Extended Regs, special mode for KS0078)
// DH=1 (Disp shift, special mode for KS0078)
// REV=0 (Reverse, special mode for KS0078)
- _writeCommand(0x2E); // Function set 001 BW N RE DH REV
+ _writeCommand(0x2E); // Function set 001 DL N RE DH REV
+ // DL=0 (4 bits bus)
// N=1 (Dont care for KS0078)
// RE=1 (Ena Extended Regs, special mode for KS0078)
// DH=1 (Disp shift, special mode for KS0078)
@@ -140,17 +189,20 @@
// BW=0 (Cur BW invert disable, special mode for KS0078)
// NW=1 (4 Line, special mode for KS0078)
- _writeCommand(0x2A); // Function set 001 BW N RE DH REV
+ _writeCommand(0x2A); // Function set 001 DL N RE DH REV
+ // DL=0 (4 bits bus)
// N=1 (Dont care for KS0078)
// RE=0 (Dis. Extended Regs, special mode for KS0078)
// DH=1 (Disp shift, special mode for KS0078)
// REV=0 (Reverse, special mode for KS0078)
break;
+// All other LCD types are initialised as 2 Line displays (including LCD40x4)
default:
- _writeCommand(0x28); // Function set 001 BW N F - -
+ _writeCommand(0x28); // Function set 001 DL N F - -
+ // DL=0 (4 bits bus)
// N=1 (2 lines)
- // F=0 (5x7 dots font)
+ // F=0 (5x7 dots font, only option for 2 line display)
// - (Don't care)
break;
@@ -163,33 +215,117 @@
// _writeCommand(0x0C); // Display Ctrl 0000 1 D C B
// // Display On, Cursor Off, Blink Off
- setCursor(TextLCD::CurOff_BlkOff);
-
- cls();
+ setCursor(TextLCD::CurOff_BlkOff);
+
}
-void TextLCD::_character(int column, int row, int c) {
- int addr = getAddress(column, row);
-
- _writeCommand(0x80 | addr);
- _writeData(c);
+
+#if(LCD40x4Test)
+void TextLCD::cls() {
+
+ // Select and configure second LCD controller when needed
+ if(_type==LCD40x4) {
+ _ctrl=TextLCD::_LCDCtrl_1; // Select 2nd controller
+
+ // Second LCD controller Cursor always Off
+ _setCursor(TextLCD::CurOff_BlkOff);
+
+ // Second LCD controller Clearscreen
+ _writeCommand(0x01); // cls, and set cursor to 0
+
+ wait_ms(10); // The CLS command takes 1.64 ms.
+ // Since we are not using the Busy flag, Lets be safe and take 10 ms
+
+
+ _ctrl=TextLCD::_LCDCtrl_0; // Select primary controller
+ }
+
+ // Primary LCD controller Clearscreen
+ _writeCommand(0x01); // cls, and set cursor to 0
+
+ wait_ms(10); // The CLS command takes 1.64 ms.
+ // Since we are not using the Busy flag, Lets be safe and take 10 ms
+
+ // Restore cursormode on primary LCD controller when needed
+ if(_type==LCD40x4) {
+ _setCursor(_currentCursor);
+ }
+
+ _row=0; // Reset Cursor location
+ _column=0;
}
-
+#else
+//standard
void TextLCD::cls() {
_writeCommand(0x01); // cls, and set cursor to 0
-// wait(0.00164f); // This command takes 1.64 ms
+
wait_ms(10); // The CLS command takes 1.64 ms.
// Since we are not using the Busy flag, Lets be safe and take 10 ms
locate(0, 0);
}
+#endif
void TextLCD::locate(int column, int row) {
- _column = column;
- _row = row;
+
+ // setAddress() does all the heavy lifting:
+ // check column and row sanity,
+ // switch controllers for LCD40x4 if needed
+ // switch cursor for LCD40x4 if needed
+ // set the new memory address to show cursor at correct location
+ setAddress(column, row);
+
+}
+
+
+//Not needed in new version, is now part of _putc()
+void TextLCD::_character(int column, int row, int c) {
+ int addr = getAddress(column, row);
+
+ _writeCommand(0x80 | addr);
+ _writeData(c);
}
+
+#if(LCD40x4Test)
+
+int TextLCD::_putc(int value) {
+ int addr;
+
+ if (value == '\n') {
+ //No character to write
+
+ //Update Cursor
+ _column = 0;
+ _row++;
+ if (_row >= rows()) {
+ _row = 0;
+ }
+ }
+ else {
+ //Character to write
+ _writeData(value);
+
+ //Update Cursor
+ _column++;
+ if (_column >= columns()) {
+ _column = 0;
+ _row++;
+ if (_row >= rows()) {
+ _row = 0;
+ }
+ }
+ } //else
+
+ //Set next memoryaddress, make sure cursor blinks at next location
+ addr = getAddress(_column, _row);
+ _writeCommand(0x80 | addr);
+
+ return value;
+}
+#else
+//Standard
int TextLCD::_putc(int value) {
if (value == '\n') {
_column = 0;
@@ -208,9 +344,16 @@
}
}
}
+
return value;
}
+#endif
+
+
+
+
+
int TextLCD::_getc() {
return -1;
}
@@ -220,31 +363,79 @@
switch(_busType) {
case _PinBus :
+#if(LCD40x4Test)
+ if(_ctrl==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
+ }
+
+#else
if (value)
_e = 1; // Set E bit
else
_e = 0; // Reset E bit
-
+#endif
break;
case _I2CBus :
+
+#if(LCD40x4Test)
+ if(_ctrl==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
+ }
+
+#else
if (value)
_lcd_bus |= D_LCD_E; // Set E bit
else
_lcd_bus &= ~D_LCD_E; // Reset E bit
- // write the new data to the portexpander
+#endif
+ // write the new data to the I2C portexpander
_i2c->write(_slaveAddress, &_lcd_bus, 1);
-
+
break;
case _SPIBus :
+#if(LCD40x4Test)
+ if(_ctrl==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
+ }
+
+#else
if (value)
_lcd_bus |= D_LCD_E; // Set E bit
else
_lcd_bus &= ~D_LCD_E; // Reset E bit
-
- // write the new data to the portexpander
+#endif
+
+ // write the new data to the SPI portexpander
_setCS(false);
_spi->write(_lcd_bus);
_setCS(true);
@@ -270,7 +461,7 @@
else
_lcd_bus &= ~D_LCD_RS; // Reset RS bit
- // write the new data to the portexpander
+ // write the new data to the I2C portexpander
_i2c->write(_slaveAddress, &_lcd_bus, 1);
break;
@@ -281,7 +472,7 @@
else
_lcd_bus &= ~D_LCD_RS; // Reset RS bit
- // write the new data to the portexpander
+ // write the new data to the SPI portexpander
_setCS(false);
_spi->write(_lcd_bus);
_setCS(true);
@@ -322,7 +513,7 @@
else
_lcd_bus &= ~D_LCD_D7; // Reset Databit
- // write the new data to the portexpander
+ // write the new data to the I2C portexpander
_i2c->write(_slaveAddress, &_lcd_bus, 1);
break;
@@ -350,7 +541,7 @@
else
_lcd_bus &= ~D_LCD_D7; // Reset Databit
- // write the new data to the portexpander
+ // write the new data to the SPI portexpander
_setCS(false);
_spi->write(_lcd_bus);
_setCS(true);
@@ -364,48 +555,51 @@
// Set CS line. Only used for SPI bus
void TextLCD::_setCS(bool value) {
- if (value)
+ if (value) {
_cs = 1; // Set CS pin
+ }
else
_cs = 0; // Reset CS pin
-
+
}
void TextLCD::_writeByte(int value) {
-// _d = value >> 4;
- _setData(value >> 4);
-// wait(0.000040f); // most instructions take 40us
- wait_us(40); // most instructions take 40us
-// _e = 0;
- _setEnable(false);
-// wait(0.000040f);
- wait_us(40); // most instructions take 40us
-// _e = 1;
+
+// Enable is Low
+ _setEnable(true);
+ _setData(value >> 4);
+ wait_us(1); // Data setup time
+ _setEnable(false);
+ wait_us(1); // Data hold time
+
_setEnable(true);
-// _d = value >> 0;
_setData(value >> 0);
-// wait(0.000040f);
- wait_us(40); // most instructions take 40us
-// _e = 0;
+ wait_us(1); // Data setup time
_setEnable(false);
-// wait(0.000040f); // most instructions take 40us
- wait_us(40); // most instructions take 40us
-// _e = 1;
- _setEnable(true);
+ wait_us(1); // Datahold time
+
+// Enable is Low
+
}
void TextLCD::_writeCommand(int command) {
-// _rs = 0;
+
_setRS(false);
- _writeByte(command);
+ wait_us(1); // Data setup time
+
+ _writeByte(command);
+ wait_us(40); // most instructions take 40us
}
void TextLCD::_writeData(int data) {
-// _rs = 1;
+
_setRS(true);
+ wait_us(1); // Data setup time
+
_writeByte(data);
+ wait_us(40); // data writes take 40us
}
@@ -459,6 +653,18 @@
else
return 0x40 + (column - 8);
+ case LCD12x4:
+ switch (row) {
+ case 0:
+ return 0x00 + column;
+ case 1:
+ return 0x40 + column;
+ case 2:
+ return 0x0C + column;
+ case 3:
+ return 0x4C + column;
+ }
+
case LCD16x4:
switch (row) {
case 0:
@@ -501,11 +707,50 @@
return 0x00 + (row * 40) + column;
case LCD8x2:
+ case LCD12x2:
case LCD16x2:
case LCD20x2:
case LCD24x2:
case LCD40x2:
return 0x00 + (row * 0x40) + column;
+
+#if(LCD40x4Test)
+ case LCD40x4:
+ // LCD40x4 is a special case since it has 2 controllers
+ // Each controller is configured as 40x2
+ if (row<2) {
+ // Test to see if we need to switch between controllers
+ if (_ctrl != _LCDCtrl_0) {
+ // Second LCD controller Cursor Off
+ _setCursor(TextLCD::CurOff_BlkOff);
+
+ // Select primary controller
+ _ctrl = _LCDCtrl_0;
+
+ // Restore cursormode on primary LCD controller
+ _setCursor(_currentCursor);
+ }
+
+ return 0x00 + (row * 0x40) + column;
+ }
+ else {
+
+ // Test to see if we need to switch between controllers
+ if (_ctrl != _LCDCtrl_1) {
+ // Primary LCD controller Cursor Off
+ _setCursor(TextLCD::CurOff_BlkOff);
+
+ // Select secondary controller
+ _ctrl = _LCDCtrl_1;
+
+ // Restore cursormode on secondary LCD controller
+ _setCursor(_currentCursor);
+ }
+
+ return 0x00 + ((row-2) * 0x40) + column;
+ }
+
+#endif
// Should never get here.
default:
@@ -514,13 +759,31 @@
}
-// Added for consistency. Set row, column and update memoryaddress.
+// Set row, column and update memoryaddress.
//
void TextLCD::setAddress(int column, int row) {
-
- locate(column, row);
+
+// Sanity Check column
+ if (column < 0) {
+ _column = 0;
+ }
+ else if (column >= columns()) {
+ _column = columns() - 1;
+ } else _column = column;
- int addr = getAddress(column, row);
+// Sanity Check row
+ if (row < 0) {
+ _row = 0;
+ }
+ else if (row >= rows()) {
+ _row = rows() - 1;
+ } else _row = row;
+
+
+// Compute the memory address
+// For LCD40x4: switch controllers if needed
+// switch cursor if needed
+ int addr = getAddress(_column, _row);
_writeCommand(0x80 | addr);
}
@@ -530,6 +793,10 @@
case LCD8x1:
case LCD8x2:
return 8;
+
+ case LCD12x2:
+ case LCD12x4:
+ return 12;
case LCD16x1:
case LCD16x2:
@@ -546,6 +813,10 @@
return 24;
case LCD40x2:
+
+#if(LCD40x4Test)
+ case LCD40x4:
+#endif
return 40;
// Should never get here.
@@ -560,7 +831,8 @@
case LCD16x1:
return 1;
- case LCD8x2:
+ case LCD8x2:
+ case LCD12x2:
case LCD16x2:
case LCD16x2B:
case LCD20x2:
@@ -568,9 +840,13 @@
case LCD40x2:
return 2;
+ case LCD12x4:
case LCD16x4:
case LCD20x4:
case LCD24x4:
+#if(LCD40x4Test)
+ case LCD40x4:
+#endif
return 4;
// Should never get here.
@@ -580,27 +856,33 @@
}
+
+#if(LCD40x4Test)
+
void TextLCD::setCursor(TextLCD::LCDCursor show) {
+
+ // Save new cursor mode, needed when 2 controllers are in use
+ _currentCursor = show;
+ // Configure current LCD controller
+ _setCursor(_currentCursor);
+
+}
+
+void TextLCD::_setCursor(TextLCD::LCDCursor show) {
+
+ // Configure current LCD controller
switch (show) {
case CurOff_BlkOff : _writeCommand(0x0C); // Cursor off and Blink Off
- wait_us(40);
- _cursor = show;
break;
- case CurOn_BlkOff : _writeCommand(0x0E); // Cursor on and Blink Off
- wait_us(40);
- _cursor = show;
+ case CurOn_BlkOff : _writeCommand(0x0E); // Cursor on and Blink Off
break;
case CurOff_BlkOn : _writeCommand(0x0D); // Cursor off and Blink On
- wait_us(40);
- _cursor = show;
break;
- case CurOn_BlkOn : _writeCommand(0x0F); // Cursor on and Blink char
- wait_us(40);
- _cursor = show;
+ case CurOn_BlkOn : _writeCommand(0x0F); // Cursor on and Blink char
break;
// Should never get here.
@@ -611,13 +893,96 @@
}
+#else
+//standard
+void TextLCD::setCursor(TextLCD::LCDCursor show) {
+
+ switch (show) {
+ case CurOff_BlkOff : _writeCommand(0x0C); // Cursor off and Blink Off
+ break;
+ case CurOn_BlkOff : _writeCommand(0x0E); // Cursor on and Blink Off
+ break;
+
+ case CurOff_BlkOn : _writeCommand(0x0D); // Cursor off and Blink On
+ break;
+
+ case CurOn_BlkOn : _writeCommand(0x0F); // Cursor on and Blink char
+ break;
+
+// Should never get here.
+ default :
+ break;
+
+ }
+
+}
+
+#endif
+
+
+
+
+#if(LCD40x4Test)
void TextLCD::setUDC(unsigned char c, char *udc_data) {
- _writeCommand(0x40 + ((c & 0x07) << 3)); //Set CG-RAM address
+
+ // Select and configure second LCD controller when needed
+ if(_type==LCD40x4) {
+ _LCDCtrl current_ctrl = _ctrl; // Temp save current controller
+
+ // Select primary controller
+ _ctrl=TextLCD::_LCDCtrl_0;
+
+ // Configure primary LCD controller
+ _setUDC(c, udc_data);
+
+ // Select 2nd controller
+ _ctrl=TextLCD::_LCDCtrl_1;
+
+ // Configure secondary LCD controller
+ _setUDC(c, udc_data);
+ // Restore current controller
+ _ctrl=current_ctrl;
+ }
+ else {
+ // Configure primary LCD controller
+ _setUDC(c, udc_data);
+ }
+
+}
+
+void TextLCD::_setUDC(unsigned char c, char *udc_data) {
+
+ // Select CG RAM for current LCD controller
+ _writeCommand(0x40 + ((c & 0x07) << 3)); //Set CG-RAM address,
+ //8 sequential locations needed per UDC
+ // Store UDC pattern
for (int i=0; i<8; i++) {
_writeData(*udc_data++);
}
+
+ //Select DD RAM again for current LCD controller
+ int addr = getAddress(_column, _row);
+ _writeCommand(0x80 | addr);
+
}
+#else
+//standard
+void TextLCD::setUDC(unsigned char c, char *udc_data) {
+ // Select CG RAM for current LCD controller
+ _writeCommand(0x40 + ((c & 0x07) << 3)); //Set CG-RAM address
+ //8 sequential locations needed per UDC
+ // Store UDC pattern
+ for (int i=0; i<8; i++) {
+ _writeData(*udc_data++);
+ }
+
+ //Select DD RAM again for current LCD controller
+ addr = getAddress(_column, _row);
+ _writeCommand(0x80 | addr);
+
+}
+#endif