Revision 1:c5f7996b1035, committed 2020-08-06

Comitter:

DheerajEtta

Date:

Thu Aug 06 20:32:47 2020 +0000

Parent:

0:f84245f91a5a

Commit message:

IR temperature sensor

Changed in this revision

diff -r f84245f91a5a -r c5f7996b1035 TextLCD_20X4.cpp
--- a/TextLCD_20X4.cpp	Fri May 14 21:19:39 2010 +0000
+++ /dev/null	Thu Jan 01 00:00:00 1970 +0000
@@ -1,170 +0,0 @@
-/* mbed TextLCD Library
- * Copyright (c) 2007-2009 sford
- * Released under the MIT License: http://mbed.org/license/mit
- *
- * TODO: Needs serious rework/neatening up!
- */
-
-/*
- *  2010/05/14 modified for 20X4 LCD by ym1784
- */
-
-#include "TextLCD_20X4.h"
-
-#include "mbed.h"
-#include "error.h"
-
-using namespace mbed;
-
-/*
- * useful info found at http://www.a-netz.de/lcd.en.php
- *
- *
- * Initialization
- * ==============
- *
- * 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 high apart from calling clock
- * _rw is kept 0 (write) apart from actions that uyse it differently
- *  -> on this program, the _rw is not used ... ym1784
- * _rs is set by the data/command writes
- */
-
-TextLCD_20X4::TextLCD_20X4(PinName rs, PinName e, PinName d0, PinName d1,
-    PinName d2, PinName d3, int columns, int rows) : _rs(rs), _e(e), _d(d0, d1, d2, d3),
-    _columns(columns), _rows(rows) {
-
-    _rows = 4;
-    _columns = 20;
-    // Mon, 27 Apr 2009 23:32:34 +0200
-    // Kevin Konradt:
-    // When using a LCD with 1 row x 16 characters
-    // instead of 2x16, try changing _columns to 8.
-    // (display seems to split the 16 characters into 
-    // 2 virtual rows with 8 characters each.)
-    //
-    // 2010/05/14 ym1784
-    // This program is only for 4 rows x 20 characters specific
-
-//  _rw = 0; // on this program, the _rw is not used ... ym1784
-    _e  = 1;
-    _rs = 0; // command mode
-
-    // Should theoretically wait 15ms, but most things will be powered up pre-reset
-    // so i'll disable that for the minute. If implemented, could wait 15ms post reset
-    // instead
-    wait(0.015); // for safety ... ym1784
-        
-    // send "Display Settings" 3 times (Only top nibble of 0x30 as we've got 4-bit bus)
-    for(int i=0; i<3; i++) {
-        writeNibble(0x3);
-        wait(0.00164);  // this command takes 1.64ms, so wait for it
-    }
-    writeNibble(0x2);   // 4-bit mode
-
-    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();
-}
-
-int TextLCD_20X4::_putc(int value) {
-    if(value == '\n') {
-        newline();
-    } else {
-        writeData(value);
-    }
-    return value;
-}
-
-int TextLCD_20X4::_getc() {
-    return 0;
-}
-
-void TextLCD_20X4::newline() {
-    _column = 0;
-    _row++;
-    if(_row >= _rows) {
-        _row = 0;
-    }
-    locate(_column, _row);
-}
-
-void TextLCD_20X4::locate(int column, int row) {
-    if(column < 0 || column >= _columns || row < 0 || row >= _rows) {
-        error("locate(%d,%d) out of range on %dx%d display", column, row, _columns, _rows);
-        return;
-    }
-    _row = row;
-    _column = column;
-// modified for 20X4 LCD
-    switch (_row) {
-        case (0) : address = 0x80 + _column;
-        break;
-        case (1) : address = 0xc0 + _column;
-        break;
-        case (2) : address = 0x94 + _column;
-        break;
-        case (3) : address = 0xd4 + _column;
-        break;
-        } // switch
-    writeCommand(address);
-}
-
-void TextLCD_20X4::cls() {
-    writeCommand(0x01); // Clear Display
-    wait(0.00164f);     // This command takes 1.64 ms
-//    locate(0, 0);     // We don't have to do this here
-}
-
-void TextLCD_20X4::reset() {
-    cls();
-}
-
-void TextLCD_20X4::clock() {
-    wait(0.000040f);
-    _e = 0;
-    wait(0.000040f);  // most instructions take 40us
-    _e = 1;
-}
-
-void TextLCD_20X4::writeNibble(int value) {
-    _d = value;
-    clock();
-}
-
-void TextLCD_20X4::writeByte(int value) {
-    writeNibble(value >> 4);
-    writeNibble(value >> 0);
-}
-
-void TextLCD_20X4::writeCommand(int command) {
-    _rs = 0;
-    writeByte(command);
-}
-
-void TextLCD_20X4::writeData(int data) {
-    _rs = 1;
-    writeByte(data);
-    _column++;
-    if(_column >= _columns) {
-        newline();
-    }
-}

diff -r f84245f91a5a -r c5f7996b1035 TextLCD_20X4.h
--- a/TextLCD_20X4.h	Fri May 14 21:19:39 2010 +0000
+++ /dev/null	Thu Jan 01 00:00:00 1970 +0000
@@ -1,114 +0,0 @@
-/* mbed TextLCD Library
- * Copyright (c) 2007-2009 sford
- * Released under the MIT License: http://mbed.org/license/mit
- *
- * TODO: Needs serious rework/neatening up!
- */
-
-/*
- *  2010/05/14 modified for 20X4 LCD by ym1784
- */
-
-#ifndef MBED_TEXTLCD_20X4_H
-#define MBED_TEXTLCD_20X4_H
-
-#include "Stream.h"
-#include "DigitalOut.h"
-#include "BusOut.h"
-
-namespace mbed {
-
-/* Class: TextLCD_20X4
- * A 20x4 Text LCD controller ... ym1784
- *
- * Allows you to print to a Text LCD screen, and locate/cls. Could be
- * turned in to a more generic libray.
- *
- * If you are connecting multiple displays, you can connect them all in
- * parallel except for the enable (e) pin, which must be unique for each
- * display.
- *
- * Example:
- * > #include "mbed.h"
- * > #include "TextLCD_20X4.h"
- * >
- * > TextLCD_20X4 lcd(p21, p22, p23, p24, p25, p26); // rs, e, d0, d1, d2, d3
- * >
- * > int main() {
- * >     lcd.printf("Hello World!");
- * > }
- */
-class TextLCD_20X4 : public Stream {
-
-public:
-    /* Constructor: TextLCD_20X4
-     * Create a TextLCD_20X4 object, connected to the specified pins
-     *
-     * All signals must be connected to DigitalIn compatible pins.
-     *
-     * Variables:
-     *  rs -  Used to specify data or command
-     *  e - enable
-     *  d0..d3 - The data lines
-     */
-    TextLCD_20X4(PinName rs, PinName e, PinName d0, PinName d1,
-        PinName d2, PinName d3, int columns = 20, int rows = 4);
-
-#if 0 // Inhereted from Stream, for documentation only
-    /* Function: putc
-     *  Write a character
-     *
-     * Variables:
-     *  c - The character to write to the serial port
-     */
-    int putc(int c);
-
-    /* Function: printf
-     *  Write a formated string
-     *
-     * Variables:
-     *  format - A printf-style format string, followed by the
-     *      variables to use in formating the string.
-     */
-    int printf(const char* format, ...);
-#endif
-
-    /* Function: locate
-     * Locate to a certian position
-     *
-     * Variables:
-     *  column - the column to locate to, from 0..19
-     *  row - the row to locate to, from 0..3
-     */
-    virtual void locate(int column, int row);
-
-    /* Function: cls
-     * Clear the screen
-     */
-    virtual void cls();
-
-    virtual void reset();
-
-//protected:
-
-    void clock();
-    void writeData(int data);
-    void writeCommand(int command);
-    void writeByte(int value);
-    void writeNibble(int value);
-    virtual int _putc(int c);
-    virtual int _getc();
-    virtual void newline();
-
-    int _row;
-    int _column;
-    DigitalOut _rs, _e;
-    BusOut _d;
-    int _columns;
-    int _rows;
-    int address;
-};
-
-}
-
-#endif

diff -r f84245f91a5a -r c5f7996b1035 main.cpp
--- a/main.cpp	Fri May 14 21:19:39 2010 +0000
+++ b/main.cpp	Thu Aug 06 20:32:47 2020 +0000
@@ -1,48 +1,59 @@
-// test for 20X4 LCD displaying RAM address by locate()
-//   ym1784 2010/05/14
-//
-// e.g.
-//     01234567890123456789
-//    +--------------------+
-//   0|80    TextLCD     93|(0,0) .. (19,0)
-//   1|C0                D3|(0,1) .. (19,1)
-//   2|94      20X4      A7|(0,2) .. (19,2)
-//   3|D4                E7|(0,3) .. (19,3)
-//    +--------------------+
+#include "mbed.h"
+#include "SPI.h"
+Serial pc (USBTX, USBRX); 
+SPI spi_temp(PB_15, PB_14, PB_13); // mosi, miso, sclk
+DigitalOut spi_cs(PB_12); // chip select
 
-#include "mbed.h"
-#include "TextLCD_20X4.h"
-
-TextLCD_20X4 lcd(p21, p22, p26, p25, p24, p23); // rs, e, d0, d1, d2, d3
-
-int main() {
-    lcd.locate(0,0);
-    lcd.printf("80");
-
-    lcd.locate(18,0);
-    lcd.printf("93");
+void temp_read ()
+{
+    spi_cs=0;
+    wait(1);
+    float data0[9], data1[9];
+    float temp[9];
+    spi_temp.write(0xA0);            // Sensor Temperature
+    wait_us(200);
+    data0[0] = spi_temp.write(0xFF); // Higher Byte
+//    if (data0[0] < 128)             // Inside temp range
+        wait_us(200);
+        data1[0] = spi_temp.write(0xFF);     // Lower Byte 
+        temp[0] = (256*data0[0] + data1[0]) / 10;    
+         
+//    else                            // Overshooting temp range
+//        data1[0] = 0;
+//        temp[0] = 85.0;   }       
+    printf("Sensor %0.2f\n",temp[0]);    // Maximum Limit reached
+    wait_us(200);
+    for (int i = 1; i<=8; i++)      // For rest 8-pixels
+    {
+        uint8_t p = 0xA0 + i ;
 
-    lcd.locate(0,1);
-    lcd.printf("C0");
-
-    lcd.locate(18,1);
-    lcd.printf("D3");
-
-    lcd.locate(0,2);
-    lcd.printf("94");
-
-    lcd.locate(18,2);
-    lcd.printf("A7");
+        spi_temp.write(p);              // Deciding from 1st - 8th pixel
+        wait_us(200);
+        data0[i] = spi_temp.write(0xFF); // Higher Byte
+        
+//        if (data0[i] < 128)             // Inside temp range
+//        {
+            wait_us(200);
+            data1[i] = spi_temp.write(0xFF);     // Lower Byte 
+            temp[i] = (256*data0[i] + data1[i]) / 10;
+//        }
+//        else                            // Overshooting temp. range
+//        {   data1[i] = 0;
+//            temp[i] = 120.0;  }       
+        printf("Pixel %d %0.2f\n",i,temp[i]);    // Maximum limit reached
+    }
+    spi_cs=1;      
+}   
 
-    lcd.locate(0,3);
-    lcd.printf("D4");
-
-    lcd.locate(18,3);
-    lcd.printf("E7");
+void spi_initialise()
+{   spi_temp.format(8, 1);          //8-bits, Mode 1
+    spi_temp.frequency(100000);     // 100 KHz frequency of SCLK
+    spi_cs=1;
+}
 
-    lcd.locate(6,0);
-    lcd.printf("TextLCD");
-
-    lcd.locate(8,2);
-    lcd.printf("20X4");
-}
+int main()
+{
+    printf("Temp Check\n");
+    spi_initialise();
+    temp_read();
+}
\ No newline at end of file

diff -r f84245f91a5a -r c5f7996b1035 mbed.bld
--- a/mbed.bld	Fri May 14 21:19:39 2010 +0000
+++ b/mbed.bld	Thu Aug 06 20:32:47 2020 +0000
@@ -1,1 +1,1 @@
-http://mbed.org/users/mbed_official/code/mbed/builds/49a220cc26e0
+https://os.mbed.com/users/mbed_official/code/mbed/builds/65be27845400
\ No newline at end of file