Revision 0:0a05dbed4fed, committed 2010-11-26

Comitter:

marcbax

Date:

Fri Nov 26 20:35:49 2010 +0000

Commit message:

Changed in this revision

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/TextLCD.cpp	Fri Nov 26 20:35:49 2010 +0000
@@ -0,0 +1,159 @@
+/* mbed TextLCD Library, for a 4-bit LCD based on HD44780
+ * Copyright (c) 2007-2010, sford
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#include "TextLCD.h"
+#include "mbed.h"
+
+TextLCD::TextLCD(PinName rs, PinName e, PinName d0, PinName d1,
+                 PinName d2, PinName d3, LCDType type) : _rs(rs),
+        _e(e), _d(d0, d1, d2, d3),
+        _type(type) {
+
+    _e  = 1;
+    _rs = 0;            // command mode
+
+    wait(0.015);        // Wait 15ms 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
+    }
+    writeByte(0x2);     // 4-bit mode
+    wait(0.000040f);    // most instructions take 40us
+
+    writeCommand(0x28); // Function set 001 BW N F - -
+    writeCommand(0x0C);
+    writeCommand(0x6);  // Cursor Direction and Display Shift : 0000 01 CD S (CD 0-left, 1-right S(hift) 0-no, 1-yes
+    cls();
+}
+
+void TextLCD::character(int column, int row, int c) {
+    int a = address(column, row);
+    writeCommand(a);
+    writeData(c);
+}
+
+void TextLCD::cls() {
+    writeCommand(0x01); // cls, and set cursor to 0
+    wait(0.00164f);     // This command takes 1.64 ms
+    locate(0, 0);
+}
+
+void TextLCD::locate(int column, int row) {
+    _column = column;
+    _row = row;
+}
+
+int TextLCD::_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;
+}
+
+int TextLCD::_getc() {
+    return -1;
+}
+
+void TextLCD::writeByte(int value) {
+    _d = value >> 4;
+    wait(0.000040f); // most instructions take 40us
+    _e = 0;
+    wait(0.000040f);
+    _e = 1;
+    _d = value >> 0;
+    wait(0.000040f);
+    _e = 0;
+    wait(0.000040f);  // most instructions take 40us
+    _e = 1;
+}
+
+void TextLCD::writeCommand(int command) {
+    _rs = 0;
+    writeByte(command);
+}
+
+void TextLCD::writeData(int data) {
+    _rs = 1;
+    writeByte(data);
+}
+
+int TextLCD::address(int column, int row) {
+    switch (_type) {
+        case LCD20x4:
+            switch (row) {
+                case 0:
+                    return 0x80 + column;
+                case 1:
+                    return 0xc0 + column;
+                case 2:
+                    return 0x94 + column;
+                case 3:
+                    return 0xd4 + column;
+            }
+        case LCD16x2B:
+            return 0x80 + (row * 40) + column;
+        case LCD16x2:
+        case LCD20x2:
+        default:
+            return 0x80 + (row * 0x40) + column;
+    }
+}
+
+int TextLCD::columns() {
+    switch (_type) {
+        case LCD20x4:
+        case LCD20x2:
+            return 20;
+        case LCD16x2:
+        case LCD16x2B:
+        default:
+            return 16;
+    }
+}
+
+int TextLCD::rows() {
+    switch (_type) {
+        case LCD20x4:
+            return 4;
+        case LCD16x2:
+        case LCD16x2B:
+        case LCD20x2:
+        default:
+            return 2;
+    }
+}

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/TextLCD.h	Fri Nov 26 20:35:49 2010 +0000
@@ -0,0 +1,111 @@
+/* mbed TextLCD Library, for a 4-bit LCD based on HD44780
+ * Copyright (c) 2007-2010, sford
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#ifndef MBED_TEXTLCD_H
+#define MBED_TEXTLCD_H
+
+#include "mbed.h"
+
+/** A TextLCD interface for driving 4-bit HD44780-based LCDs
+ *
+ * Currently supports 16x2, 20x2 and 20x4 panels
+ *
+ * @code
+ * #include "mbed.h"
+ * #include "TextLCD.h"
+ * 
+ * TextLCD lcd(p10, p12, p15, p16, p29, p30); // rs, e, d0-d3
+ * 
+ * int main() {
+ *     lcd.printf("Hello World!\n");
+ * }
+ * @endcode
+ */
+class TextLCD : public Stream {
+public:
+
+    /** LCD panel format */
+    enum LCDType {
+        LCD16x2     /**< 16x2 LCD panel (default) */
+        , LCD16x2B  /**< 16x2 LCD panel alternate addressing */
+        , LCD20x2   /**< 20x2 LCD panel */
+        , LCD20x4   /**< 20x4 LCD panel */
+    };
+
+    /** Create a TextLCD interface
+     *
+     * @param rs    Instruction/data control line
+     * @param e     Enable line (clock)
+     * @param d0-d3 Data lines
+     * @param type  Sets the panel size/addressing mode (default = LCD16x2)
+     */
+    TextLCD(PinName rs, PinName e, PinName d0, PinName d1, PinName d2, PinName d3, LCDType type = LCD16x2);
+
+#if DOXYGEN_ONLY
+    /** Write a character to the LCD
+     *
+     * @param c The character to write to the display
+     */
+    int putc(int c);
+
+    /** Write a formated string to the LCD
+     *
+     * @param format A printf-style format string, followed by the
+     *               variables to use in formating the string.
+     */
+    int printf(const char* format, ...);
+#endif
+
+    /** Locate to a screen column and row
+     *
+     * @param column  The horizontal position from the left, indexed from 0
+     * @param row     The vertical position from the top, indexed from 0
+     */
+    void locate(int column, int row);
+
+    /** Clear the screen and locate to 0,0 */
+    void cls();
+
+    int rows();
+    int columns();
+
+protected:
+
+    // Stream implementation functions
+    virtual int _putc(int value);
+    virtual int _getc();
+
+    int address(int column, int row);
+    void character(int column, int row, int c);
+    void writeByte(int value);
+    void writeCommand(int command);
+    void writeData(int data);
+
+    DigitalOut _rs, _e;
+    BusOut _d;
+    LCDType _type;
+
+    int _column;
+    int _row;
+};
+
+#endif

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Fri Nov 26 20:35:49 2010 +0000
@@ -0,0 +1,107 @@
+#include "mbed.h"
+#include "TextLCD.h"
+
+DigitalOut led1(LED1);                                      //Set up all 4 LEDs for debugging purposes
+DigitalOut led2(LED2);
+DigitalOut led3(LED3);
+DigitalOut led4(LED4);
+PwmOut clk(p22);                                            //CLK signal to pin 2 of S9226
+DigitalOut start(p23);                                      //ST signal to pin 4 of S9226
+DigitalOut vgain(p24);                                      //Video gain - 0=high, 1=low
+DigitalOut itrcheck(p5);                                    //itrcheck is "1" during A-to-D conversion - debugging purpose
+DigitalIn EOS(p17);                                         //EOS signal from pin 7 of S9226
+DigitalIn clkin(p21);                                       //loopback CLK input to count integration time
+DigitalIn button1(p14);                                     //Define start/stop button
+AnalogIn video(p20);                                        //analog input signal - output from pin 6 on S9226
+InterruptIn trigger(p18);                                   //Trig signal from pin 3 of S9226
+TextLCD lcd(p8, p9, p10, p11, p12, p13);                    //Define 16 x 2 character LCD
+LocalFileSystem local("local");                             //Define file system on mbed thumbdrive
+int i,j,k, pixvalue, avnumber, avarray, avdiv, clkperiod;
+int pixels[1024], avpixels[1024];
+
+void readpixel() {                                          //ISR that takes one pixel reading, called on falling flank of "trigger"
+    itrcheck=1;
+    pixels[i] = video.read_u16()/avnumber;
+    i++;
+    itrcheck=0;
+}
+
+//void counttrig() {
+//    i++;
+//}
+
+int main() {
+    clkperiod = 40;                                         //clock period in microseconds - must be a multiple of 10
+    clk.period_us(clkperiod);                               //set clock frequency
+    clk.write(0.5);                                         //set duty cycle to 50%
+    start = 1;                                              //set start line "high"
+    vgain = 1;                                              //set video gain to "low"
+
+    //USER SETTINGS
+    avnumber = 32;                                          //THIS IS WHERE YOU SET THE NUMBER OF AVERAGES
+    avdiv = 1024/avnumber;                                  //AVNUMBER MUST BE A POWER OF 2: 2,4,8,16,32,64,128
+    //END USER SETTINGS
+
+    itrcheck=0;
+    lcd.cls();
+    while (1) {
+        lcd.locate(0,0);
+        lcd.printf("Scan __ of%3i  ", avnumber);            //Show avnumber on display
+        while (!button1)                                    //waiting till start button is pressed
+            lcd.locate(0,1);
+        lcd.printf("Preparing scans   ");
+        for (i=0; i<1025; i++) {                            //clear array of average pixel values
+            avpixels [i] = 0;
+        }
+        while (!clkin)                                      //wait for clkin to go "high" - start condition
+            wait_us(clkperiod/10);                          //give start pulse of half a clock period, while start is low
+        start = 0;
+        wait_us(clkperiod/2);
+        start = 1;
+        led1=1;
+        avarray=0;
+        i=0;
+        while (EOS) {                                       //read pixels for dummy scan until EOS goes "low"
+            trigger.fall(&readpixel);
+        }
+        wait(0.1);                                          //0.1s delay to make sure all interrupts are handled
+        lcd.cls();                                          //Clear display
+        for (int j=0; j<avnumber; j++) {                    //make "avnumber" scans and put average results in the avpixel array
+            wait(0.1);
+            lcd.locate(0,0);
+            lcd.printf("Scan%3i of%3i", j+1, avnumber);
+            while (!clkin)
+                wait_us(clkperiod/10);
+            start = 0;
+            wait_us(clkperiod/2);
+            start = 1;
+            led1 = !led1;                                   //Blink LED1 while scanning
+            i=0;
+            while (EOS) {
+                trigger.fall(&readpixel);
+            }
+            wait(0.1);
+            avarray = 0;
+            for (int i=0; i<1024; i++) {                    //divide the result by avnumber then add to sum
+                avpixels [i] = avpixels [i] + pixels [i];
+                avarray = avarray + (pixels[i]/avdiv);      //Calculate average value over entire array over this scan
+            }
+            lcd.locate(0,1);
+            lcd.printf("ArrayAv: %6i", avarray);
+        }
+        wait(0.1);
+        led1 = 0;
+        lcd.locate(0,1);
+        FILE *fp = fopen("/local/data.csv", "w");           //create or overwrite file "data.csv" on the mbed thumbdrive
+        lcd.printf("File opened     ");
+        for (int i=10; i<1014; i++) {                       //write pixel numbers and average values, skipping first and last 10 pixels
+            fprintf(fp, "%6i,%8i\n", i, avpixels[i]);
+        }
+        fclose(fp);                                         //close file "data.csv" so it can be read by the PC
+        lcd.locate(0,0);
+        lcd.printf("ArrayAv: %6i", avarray);
+        lcd.locate(0,1);
+        lcd.printf("DATA.CSV ready");
+        wait(5);
+    }
+}

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mbed.bld	Fri Nov 26 20:35:49 2010 +0000
@@ -0,0 +1,1 @@
+http://mbed.org/users/mbed_official/code/mbed/builds/e2ac27c8e93e