Entries by Stephen Harrison

    1 /*

    2   Build Indicator (c) Analysis UK Ltd 2008

    4   Digital Pin Assignments:

    5   0 - RX

    6   1 - TX

    7   2 - Project 6 - Green LED

    8   3 - Project 6 - Red LED

    9   4 - Project 5 - Green LED

   10   5 - Project 5 - Red LED

   11   6 - Project 4 - Green LED

   12   7 - Project 4 - Red LED

   13   8 - Project 3 - Green LED

   14   9 - Project 3 - Red LED

   15   10 - Project 2 - Green LED

   16   11 - Project 2 - Red LED

   17   12 - Project 1 - Green LED

   18   13 - Project 1 - Red LED

   19  */

   20 

   21 #define VERSION "1.0"

   22 

   23 // Project not enabled of not connected.

   24 int PROJECT_OFF = 0;

   25 

   26 // Project build failed

   27 int PROJECT_FAIL = 1; // 001

   28 

   29 // Project build good

   30 int PROJECT_GOOD = 2; // 010

   31 

   32 // project building from a failed project.

   33 int PROJECT_BUILDING_FAIL = 5; // 101

   34 

   35 // project building from a good build.

   36 int PROJECT_BUILDING_GOOD = 6; // 110

   37 

   38 // Maximum number of projects.

   39 int maxProjects = 6;

   40 

   41 // Project status codes.  Indexed by project.

   42 int projectStatus[] = {

   43   0, 0, 0, 0, 0, 0};

   44 

   45 // Pins for the Red LEDs.  Indexed by project. 

   46 int redLEDPin[] = {

   47   13, 11, 9, 7, 5, 3};

   48 

   49 // Pins for the Green LEDs.  Indexed by project.

   50 int greenLEDPin[] = {

   51   12, 10, 8, 6, 4, 2}; // pins 0 and 1 reserverd for RS232.

   54 // run once, when the sketch starts

   55 void setup()                   

   56 {

   57   // Initialise the ports for output to drive the LEDs

   58   for (int i=0; i<maxProjects; i++) {

   59     pinMode(greenLEDPin[i], OUTPUT);    // sets the digital pin as output for the green/blue part of the tri color LED

   60     pinMode(redLEDPin[i], OUTPUT);      // sets the digital pin as output for the red part of the tri color LED

   61   }

   62 

   63   // Setup Serial communications

   64   Serial.begin(57600);

   65 }

   67 // Main loop, runs over and over again

   68 void loop()                   

   69 { 

   70   // Check and Read settings from PC

   71   ReadCommands();

   72 

   73   // Update the LED's to indicate project status'

   74   UpdateLEDs();

   75 

   76   // Idle.      

   77   Idle();

   78 }

   79 

   86 // Read commands sent from the PC

   87 void ReadCommands()

   88 {

   89   // Check if serial data available, if so then read this in

   90 

   91   // Read all from the serial port until no more bytes available looking for the

   92   // start byte (1) of a message.

   93   while (Serial.available()) {

   94     //read the incoming byte:

   95     int incomingByte = Serial.read();

   96 

   97     // Start identifier.  STX

   98     if (incomingByte == 2) {

   99       // Found start byte now read in until we get the end of message byte.

  100       ReadSeialCommand();

  101       return;

  102     }

  103   } 

  104 }

  105 

  106 // Read a command from the serial port.  Read until the read byte

  107 // is an end of message (new line) indicator.

  108 void ReadSeialCommand() {

  109   // Expect maximum of 25 bytes (normally 6)

  110   byte buffer[25];

  111   int index=0;

  112 

  113   while (true) {

  114     if (Serial.available()) {

  115       // read the incoming byte:

  116       int incomingByte = Serial.read();

  117 

  118       // Terminating byte

  119       // Wait for ETX (End of text - transmision)

  120       if (incomingByte==3) {

  121         ProcessRequest(buffer);

  122         return;

  123       }

  124       else {

  125         buffer[index] = incomingByte;

  126         index++;

  127       }

  128 

  129       // Check for buffer overflow and give up if it has.

  130       if (index>25) {

  131         Serial.print("Error:Buffer Overflow.\n\r");

  132         return;

  133       }

  134     }

  135   }

  136 }

  137 

  138 void ProcessRequest(byte request[]) {

  139 

  140   boolean processed = false;

  141 

  142   // Check for Query commands (? at the start)

  143   if (request[0] == 63) {

  144     // Query

  145     processed = ProcessQuery(request);

  146   }

  147   else if (request[0] == 64) {

  148     // Set (@P[x]=0) - Set Project x = status.

  149     processed = ProcessSetValue(request);

  150   }

  151 

  152   if (!processed) {

  153     Serial.print ("Error:Unknown Request.\n\r");

  154   }

  155 }

  156 

  157 boolean ProcessQuery(byte request[]) {

  158 

  159   boolean processed = false;

  160 

  161   switch (request[1]) {

  162   case 86: // ?V - version

  163     processed = SendVersion();

  164   default:

  165     Serial.print ("Error:Unknown Query.\n\r");

  166   }   

  167   return processed;

  168 }

  169 

  170 boolean ProcessSetValue(byte request[]) {

  171 

  172   boolean processed = false;

  173   byte command = request[1];

  174   // Allow ascii version of the fan number.

  175   //Position 2 should be [

  176   byte project = request[3] - 48; // 48 = 0

  177   //position 4 should be ]

  178   //position 5 should be =

  179   //position 6 should be the raw value.

  180   byte value = request[6];

  181 

  182   switch (command) {

  183   case 80: //@P[x]=y Set project x status y.  y is ascii version of the status (0-9).  so subtract 48.

  184     processed = SetProjectStatus((int)project, (int)value - 48);

  185     break;

  186   default:

  187     Serial.print ("Error:Unknown set command.");

  188   }

  189 

  190   return processed;

  191 }

  192 

  193 boolean SendVersion() {

  194   Serial.print ("Version=");

  195   Serial.print (VERSION);

  196   Serial.print ("\n\r");

  197   return true;

  198 }

  199 

  200 // Set the status for the project.

  201 boolean SetProjectStatus(int project, int status) {

  202 

  203   if (projectStatus[project-1] != status) {

  204     projectStatus[project-1] = status;

  205 

  206     // Build failed.  Flash the red LED briefly to get attention.

  207     if (status == 1) {

  208       digitalWrite(greenLEDPin[project-1], LOW);

  209 

  210       for (int i=0; i<6; i++) {

  211         digitalWrite(redLEDPin[project-1], HIGH);

  212         delay(100);

  213         digitalWrite(redLEDPin[project-1], LOW);

  214         delay(100);

  215       }

  216     }

  217   }

  218 

  219   return true;

  220 }

  221 

  222 boolean UpdateLEDs() {

  223 

  224   for (int i=0; i<maxProjects; i++) {

  225     int greenLEDStatus = LOW;

  226     int redLEDStatus = LOW;

  227 

  228     switch (projectStatus[i]) {

  229     case 0: // NC

  230       // No acton

  231       break;

  232     case 1: // Fail

  233       redLEDStatus = HIGH;

  234       break;

  235     case 2: // Good

  236       greenLEDStatus = HIGH;

  237       break;

  238     case 5: // Building from a Fail build

  239     case 6: // Building from a good build

  240       greenLEDStatus = HIGH;

  241       redLEDStatus = HIGH;

  242       break;

  243     default:

  244       redLEDStatus = HIGH;

  245       break;

  246     }

  247 

  248     // Determine project LED pins and set them appropriatly.

  249     digitalWrite(redLEDPin[i], redLEDStatus);

  250     digitalWrite(greenLEDPin[i], greenLEDStatus);

  251   }

  252 }