Revision 0:2c5bba968d7c, committed 2010-02-14

Comitter:

bikeNomad

Date:

Sun Feb 14 00:28:08 2010 +0000

Commit message:

Changed in this revision

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/Terminal.cpp	Sun Feb 14 00:28:08 2010 +0000
@@ -0,0 +1,73 @@
+/* mbed Terminal TextDisplay Library
+ * Copyright (c) 2007-2009 sford
+ * Released under the MIT License: http://mbed.org/license/mit
+ */
+
+#include "Terminal.h"
+
+#include "mbed.h"
+
+Terminal::Terminal(PinName tx, PinName rx) : _serial(tx, rx) {
+    cls();
+}
+
+void Terminal::character(uint16_t column, uint16_t row, int c) {
+    // Cursor Home    <ESC>[{ROW};{COLUMN}H 
+    _serial.printf("\033[%u;%uH%c", row + 1, column + 1, c);
+}
+
+uint16_t Terminal::columns() {
+    return 80;
+}
+
+uint16_t Terminal::rows() { 
+    return 35; 
+}
+
+void Terminal::cls() {
+    _serial.printf("\033[2J");
+}
+
+void Terminal::foreground(uint32_t colour) {
+
+    /* Set Attribute Mode    <ESC>[{n}m
+     * - Sets display attribute settings. The following lists standard attributes:
+     * 
+     * Foreground Colours
+     * 30    Black
+     * 31    Red
+     * 32    Green
+     * 33    Yellow
+     * 34    Blue
+     * 35    Magenta
+     * 36    Cyan
+     * 37    White
+     */
+    uint32_t r = (colour >> 23) & 1;
+    uint32_t g = (colour >> 15) & 1;
+    uint32_t b = (colour >> 7) & 1;
+    uint32_t bgr = (b << 2) | (g << 1) | (r << 0);
+    uint32_t c = 30 + bgr;
+    _serial.printf("\033[%um", c);
+}
+
+void Terminal::background(uint32_t colour) {
+
+    /* Background Colours
+     * 40    Black
+     * 41    Red
+     * 42    Green
+     * 43    Yellow
+     * 44    Blue
+     * 45    Magenta
+     * 46    Cyan
+     * 47    White
+     */
+    uint32_t r = (colour >> 23) & 1;
+    uint32_t g = (colour >> 15) & 1;
+    uint32_t b = (colour >> 7) & 1;
+    uint32_t bgr = (b << 2) | (g << 1) | (r << 0);
+    uint32_t c = 40 + bgr;
+    _serial.printf("\033[%um", c);
+}
+

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/Terminal.h	Sun Feb 14 00:28:08 2010 +0000
@@ -0,0 +1,37 @@
+/* mbed Terminal TextDisplay Library
+ * Copyright (c) 2007-2009 sford
+ * Released under the MIT License: http://mbed.org/license/mit
+ *
+ * Modified by Ned Konz
+ * to add baud rate setting
+ *
+ * Implementation of a TextDisplay using a VT100 Terminal and 
+ * escape codes (e.g. Teraterm, Hyperterminal)
+ */
+
+#include "TextDisplay.h"
+
+#ifndef MBED_TERMINAL_H
+#define MBED_TERMINAL_H
+
+class Terminal : public TextDisplay {
+public:
+
+    Terminal(PinName tx, PinName rx);
+
+    virtual void character(uint16_t column, uint16_t row, int c);
+    virtual uint16_t rows(); 
+    virtual uint16_t columns();  
+
+    virtual void cls();
+    virtual void foreground(uint32_t colour);
+    virtual void background(uint32_t colour);
+    virtual void baud(uint16_t newbaud) { _serial.baud(newbaud); }
+
+protected:
+
+    Serial _serial;
+    
+};
+
+#endif

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/TextDisplay.cpp	Sun Feb 14 00:28:08 2010 +0000
@@ -0,0 +1,57 @@
+/* mbed TextDisplay Display Library Base Class
+ * Copyright (c) 2007-2009 sford
+ * Released under the MIT License: http://mbed.org/license/mit
+ */
+ 
+#include "TextDisplay.h"
+
+TextDisplay::TextDisplay() {
+    _row = 0;
+    _column = 0;
+}
+    
+int TextDisplay::_putc(int value) {
+    if(value == '\n') {
+        _column = 0;
+        _row++;
+        if(_row >= rows()) {
+            _row = 0;
+        }
+    } else {
+        character(_column, _row, value);
+        _column++;
+        if(_column >= columns()) {
+            _column = 0;
+            _row++;
+            if(_row >= rows()) {
+                _row = 0;
+            }
+        }
+    }
+    return value;
+}
+
+// crude cls implementation, should generally be overwritten in derived class
+void TextDisplay::cls() {
+    locate(0, 0);
+    for(int i=0; i<columns()*rows(); i++) {
+        putc(' ');
+    }
+}
+
+void TextDisplay::locate(uint16_t column, uint16_t row) {
+    _column = column;
+    _row = row;
+}
+
+int TextDisplay::_getc() {
+    return -1;
+}
+        
+void TextDisplay::foreground(uint32_t colour) {
+    _foreground = colour;
+}
+
+void TextDisplay::background(uint32_t colour) {
+    _background = colour;
+}

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/TextDisplay.h	Sun Feb 14 00:28:08 2010 +0000
@@ -0,0 +1,52 @@
+/* mbed TextDisplay Library Base Class
+ * Copyright (c) 2007-2009 sford
+ * Released under the MIT License: http://mbed.org/license/mit
+ *
+ * A common base class for Text displays
+ * To port a new display, derive from this class and implement
+ * the constructor (setup the display), character (put a character
+ * at a location), rows and columns (number of rows/cols) functions.
+ * Everything else (locate, printf, putc, cls) will come for free
+ *
+ * The model is the display will wrap at the right and bottom, so you can
+ * keep writing and will always get valid characters. The location is 
+ * maintained internally to the class to make this easy
+ */
+
+#ifndef MBED_TEXTDISPLAY_H
+#define MBED_TEXTDISPLAY_H
+
+#include "mbed.h"
+
+class TextDisplay : public Stream {
+public:
+
+    // functions needing implementation in derived implementation class
+    TextDisplay();
+    virtual void character(uint16_t column, uint16_t row, int c) = 0;
+    virtual uint16_t rows() = 0;
+    virtual uint16_t columns() = 0;
+    
+    // functions that come for free, but can be overwritten
+    virtual void cls();
+    virtual void locate(uint16_t column, uint16_t row);
+    virtual void foreground(uint32_t colour);
+    virtual void background(uint32_t colour);
+    // putc (from Stream)
+    // printf (from Stream)
+    
+protected:
+
+    virtual int _putc(int value);
+    virtual int _getc();
+
+    // character location
+    uint16_t _column;
+    uint16_t _row;
+
+    // colours
+    uint32_t _foreground;
+    uint32_t _background;
+};
+
+#endif

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/TextDisplays.h	Sun Feb 14 00:28:08 2010 +0000
@@ -0,0 +1,20 @@
+/* mbed Text Displays Collection Library
+ * Copyright (c) 2007-2009 sford
+ * Released under the MIT License: http://mbed.org/license/mit
+ *
+ * A library for providing a common base class for Text 
+ * displays, to provide commonality and simplify porting of new displays 
+ */
+
+#ifndef MBED_TEXT_DISPLAYS_H
+#define MBED_TEXT_DISPLAYS_H
+
+// Display Base Class
+#include "TextDisplay.h"
+
+// Text Displays
+#include "TextLCD.h"
+#include "Terminal.h"
+
+
+#endif

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/TextLCD.cpp	Sun Feb 14 00:28:08 2010 +0000
@@ -0,0 +1,161 @@
+/* mbed TextLCD Library
+ * Copyright (c) 2007-2009 sford
+ * Released under the MIT License: http://mbed.org/license/mit
+ *
+ * Modified by Ned Konz to provide better support for 4-line LCDs and ones with other controller chips.
+ */
+
+#include "TextLCD.h"
+#include "mbed.h"
+
+/*
+ * useful info found at http://www.a-netz.de/lcd.en.php
+ *
+ * Initialisation
+ * ==============
+ *
+ * After attaching the supply voltage/after a reset, the display needs to be brought in to a defined state
+ *
+ * - wait approximately 15 ms so the display is ready to execute commands
+ * - Execute the command 0x30 ("Display Settings") three times (wait 1,64ms after each command, the busy flag cannot be queried now).
+ * - The display is in 8 bit mode, so if you have only connected 4 data pins you should only transmit the higher nibble of each command.
+ * - If you want to use the 4 bit mode, now you can execute the command to switch over to this mode now.
+ * - Execute the "clear display" command
+ *
+ * Timing
+ * ======
+ *
+ * Nearly all commands transmitted to the display need 40us for execution.
+ * Exceptions are the commands "Clear Display and Reset" and "Set Cursor to Start Position"
+ * These commands need 1.64ms for execution. These timings are valid for all displays working with an
+ * internal clock of 250kHz. But I do not know any displays that use other frequencies. Any time you
+ * can use the busy flag to test if the display is ready to accept the next command.
+ *
+ * _e is kept low except when being used.
+ * _rw is kept 0 (write) apart from actions that use it differently
+ * _rs is set by the data/command writes
+ */
+
+TextLCD::TextLCD(PinName rs, PinName rw, PinName e, PinName d0, PinName d1,
+                 PinName d2, PinName d3, uint16_t rows, uint16_t cols) : _rw(rw), _rs(rs),
+        _e(e), _d(d0, d1, d2, d3), _rows(rows), _columns(cols) {
+
+    _rw = 0;
+    wait_us(1);     // min. 100nsec delay
+    _e  = 0;
+    _rs = 0;    // command mode
+    _d.output();
+
+    reset();
+    cls();
+}
+
+void TextLCD::reset() {
+    wait_ms(15);
+    // e is low at this point, as is rw.
+    // 2. Send 0x3 and wait 150 ms (will stay in 8-bit mode if already there)
+    writeHalfByte(0x3);
+    wait_ms(5);
+    // 3. Send 0x3 and wait 150 ms (will go to 8-bit mode if was in 4-bit without any garbage nibble)
+    writeHalfByte(0x3);
+    wait_ms(5);
+    // 4. Send 0x3 and wait 250 ms (will go to 8-bit mode even if garbage nibble was previously received)
+    writeHalfByte(0x3);
+    wait_ms(5);
+    // 5. Send 0x2 and wait 200 ms (should go to 4-bit mode now)
+    writeHalfByte(0x2);
+    wait_ms(5);
+    // 7. Send LCD setup sequence (eg 0x2, 0x8 (=0x28), 0x0, 0x8 (=0x08), etc.)
+    writeCommand(0x28);    // Function set 001 BW N F - -
+    wait_ms(15);
+
+    writeCommand(0x08);     // display off, cursor invisible
+    wait_ms(15);
+
+    writeCommand(0x01);
+    wait_ms(15);      // 1.64ms command
+
+    writeCommand(0x0C);     // display enabled, cursor invisible
+    wait_ms(15);
+
+    writeCommand(0x6);  //  Cursor Direction and Display Shift : 0000 01 CD S (CD 0-left, 1-right S(hift) 0-no, 1-yes
+    wait_ms(15);
+
+    locate(0,0);
+}
+
+// memory starts at 0x80, and is 0x40 chars long per row
+// However, rows 2 and 3 of 4-line displays are actually adjacent to rows 0 and 1.
+// 16x4 displays are addressed the same way as 20x4 ones.
+
+void TextLCD::character(uint16_t column, uint16_t row, int c) {
+    int address;
+    address = 0x80 + ((row & ~2) * 0x40) + column;
+    if (row > 1)
+        address += 20;
+    writeCommand(address);
+    writeData(c);
+}
+
+void TextLCD::writeHalfByte(uint16_t value) {
+    _e = 1;
+    wait_us(1);
+    _d = value & 0x0F;    // send data on bus
+    wait_us(1); // setup time
+    _e = 0; // strobe
+    wait_us(1); // hold time
+}
+
+void TextLCD::writeByte(uint16_t value) {
+    writeHalfByte(value>>4);
+    writeHalfByte(value);
+}
+
+void TextLCD::writeCommand(uint16_t command) {
+    _rs = 0;
+    writeByte(command);
+    waitUntilDone();
+}
+
+void TextLCD::writeData(uint16_t data) {
+    _rs = 1;
+    writeByte(data);
+    waitUntilDone();
+}
+
+void TextLCD::cls() {
+    writeCommand(0x01);
+    wait_us(2000);      // 1.64ms command
+    locate(0,0);
+}
+
+// This should be changed to use readAddressAndBusy() when that works.
+void TextLCD::waitUntilDone() {
+    wait_us(60);
+}
+
+// Return the busy/address byte.
+// The busy flag is the high bit.
+// Not yet working reliably.
+uint16_t TextLCD::readAddressAndBusy() {
+    _d.input();
+    _rw = 1;
+    wait_us(1);
+    _e = 1;
+    wait_us(1);
+    _e = 0;
+
+    uint16_t retval = _d.read() << 4;
+
+    wait_us(1);
+    _e = 1;
+    wait_us(1);
+    _e = 0;
+
+    retval |= _d.read();
+    _rw = 0;
+
+    _d.output();
+    return retval;
+}
+

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/TextLCD.h	Sun Feb 14 00:28:08 2010 +0000
@@ -0,0 +1,37 @@
+/* mbed TextLCD Library Base Class
+ * Copyright (c) 2007-2009 sford
+ * Released under the MIT License: http://mbed.org/license/mit
+ * Modified by Ned Konz to provide better support for 4-line LCDs and ones with other controller chips.
+ */
+#include "TextDisplay.h"
+
+#ifndef MBED_TEXTLCD_H
+#define MBED_TEXTLCD_H
+
+class TextLCD : public TextDisplay {
+	public:
+		TextLCD(PinName rs, PinName rw, PinName e,
+			    PinName d0, PinName d1, PinName d2, PinName d3,
+				uint16_t rows = 2, uint16_t columns = 16);
+		virtual void character(uint16_t column, uint16_t row, int c);
+		virtual uint16_t rows() { return _rows; }
+		virtual uint16_t columns() { return _columns; }
+		virtual void reset();
+		virtual void cls();
+
+		// locate, putc, printf come from parent class
+
+	protected:
+		void writeByte(uint16_t value);
+		void writeHalfByte(uint16_t value);
+		void writeCommand(uint16_t command);
+		void writeData(uint16_t data);
+		uint16_t readAddressAndBusy();
+		void waitUntilDone();
+
+		DigitalOut _rw, _rs, _e;
+		BusInOut _d;
+		uint16_t _rows, _columns;
+};
+
+#endif