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File: arduino/testSerial.ino

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  Classes of Marco Sillano   Arduino PHP Serial Linux   arduino/testSerial.ino   Download  
File: arduino/testSerial.ino
Role: Auxiliary data
Content type: text/plain
Description: Auxiliary data
Class: Arduino PHP Serial Linux
Communicate with a Arduino board via serial port
Author: By
Last change:
Date: 5 years ago
Size: 2,910 bytes
 

Contents

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// Lo sketch usa 7144 byte (24%) dello spazio disponibile per i programmi. Il massimo 28672 byte. // Le variabili globali usano 208 byte (8%) di memoria dinamica, lasciando altri 2352 byte liberi per le variabili locali. Il massimo 2560 byte. // To test ArduinoLinuxSerial.php class, use this with testSerial.php int ledPin = 13; // Arduino yun red led // for serial messages (first char = <x>, place for <order>) char r1[] = "LED ON"; char r2[] = "LED OFF"; char err[] = "ERROR CODE"; String inputString = ""; // a String to hold incoming data boolean stringComplete = false; // whether the string is complete void setup() { pinMode(ledPin, OUTPUT); // reserve 64 bytes for the inputString (same as Serial buffer) inputString.reserve(64); // initialize serial: Serial.begin(115200); while (!Serial) { ; // wait for serial port to connect. Needed for native USB port only } } // This simple serial protocol: // Input message "3xxxxcc" - sintax: <0..9: command> [<moredata>]<crc-hex><\n> // Output message "LED ONcc" - sintax: <payload><crc-hex><\n> void loop_messages() { inputString.trim(); String inmess = cutCRC(inputString); // tests and cts CRC String payload = inmess; if (!inmess.startsWith("ERR")) { switch (inmess.charAt(0)) // here commands switch { case '1': payload = do_command1(); break; case '2': payload = do_command2(); break; /* ... more ...*/ default: payload = String(err); } } Serial.print(addCRC(payload)); Serial.write(10); // Serial.write(4); } void loop() { while (Serial.available()) { // get the new byte: char inChar = (char)Serial.read(); if (inChar == '\n') { // if the incoming character is a newline, set a flag so the main loop can do something about it: stringComplete = true; } else // add it to the inputString: inputString += inChar; } if (stringComplete) { loop_messages(); // clear the string: inputString = ""; stringComplete = false; } // more loop actions } // ============================ locals, used by loop_messages String addCRC(String txmess) { byte crc = 0; for (unsigned int i = 0; i < txmess.length(); i++) crc ^= (byte)txmess.charAt(i); // the simplest CRC, only XOR String str_crc = String(crc, HEX); if (str_crc.length() == 1) return txmess + "0" + str_crc; return txmess + str_crc; } String cutCRC(String rxmess) { String clean = rxmess.substring(0, rxmess.length() - 2); if ( rxmess.equals(addCRC(clean))) return clean; return String("ERROR LCRC"); } //==================================== do commands functions // command 1: LED13 ON String do_command1() { digitalWrite(ledPin, HIGH); return String(r1); } // command 2: LED13 OFF String do_command2() { digitalWrite(ledPin, LOW); return String(r2); }