Exemple de code source pour un Arduino fonction enregistreur de données de temps-événement. Montre interruptions, journalisation asynchrone et contact de rebondissent. Destinés à un interrupteur de position roue, enregistre les temps au cours de laquelle la touche est enfoncée.
Nous utilisons un interrupteur reed qui rebondit lorsque engagés et lorsque dis-engagés. Cela lève plusieurs interruptions. Anneau tampon entrée vérifie si la durée de l’événement est considérablement plus courte que l’événement temps précédemment connecté. Dans l’affirmative, déclenchement court est rejeté comme rebond de contact. Événements rejetés sont stockés, et en cas de nombreux rejets d’affilée, ils sont tous connectés, en supposant que quelque chose s’est passé et ils peuvent être des événements importants. La motivation, c’est qu’il vaut mieux se connecter quelques rebonds qu’afin de manquer un événement pour cette application. Les données peuvent être nettoyées plus loin en post traitement, mais nous ne voulons pas encombrer nos bûches avec tous les événements de rebondissements de contacts.
/* $URL: svn+ssh://aaron $ $Id: vLogger.ino 62 2012-06-03 20:11:13Z aaron $ Log the times when a wheel position sensor triggers, as an indirect method of logging time and distance, which can be used to estimate velocity and acceleration in a coast-down wind resistance experiment. User flips switch to record to a ring buffer. Main loop prints ring buffer contents to serial port, asynch. Each time the record operation cycles, the time is reset to start at zero. Sensor switch must be on pin 2, since this pin uses standard external interrupt 0 */ #define PIN_RECORD 4 // record on/off switch #define PIN_LED_RECORD 8 // on when recording #define PIN_LED_SENSOR 13 // toggles as sensor turns #define BUF_LEN 256 // samples in data ring buffer #define MAX_SHORT 10 // max "short" events before assuming they are NOT contact bounce typedef long DATATYPE; #include // sprintf // Diagnostic output logger. Call log from ISR, print outside ISR #define MAX_LOG_LEN 40 #define LOG_BUF_LEN 8 class Logger { protected: volatile int nIn; int nOut; char buf[LOG_BUF_LEN][MAX_LOG_LEN]; public: char msgBuf[MAX_LOG_LEN]; Logger() { nIn=nOut=0; } void print() { if (nOut >= nIn) return; int i = nOut % LOG_BUF_LEN; nOut++; Serial.println(buf[i]);Serial.flush(); } void log(const char *msg) { int i,k; k = nIn % LOG_BUF_LEN; for (i=0; (msg[i]!=0) && (i < MAX_LOG_LEN-1); i++) buf[k][i]=msg[i]; buf[k][i]=0; nIn++; } void log() { log(msgBuf); } // for using provided msgBuf } Log; class RingBuffer { protected: volatile int nIn; int nOut; volatile DATATYPE buf[BUF_LEN]; public: void reset() { nIn=nOut=0; } RingBuffer() { reset(); } volatile void push(DATATYPE x) { if (nOut <= nIn - BUF_LEN) { sprintf(Log.msgBuf,"RingBuffer Overflow %d",x);Log.log(); //Serial.println("RingBuffer Overflow ");Serial.println(x);//Serial.flush(); return; } int i = nIn % BUF_LEN; buf[i]=x; nIn++; } inline bool empty() const { return(nOut >= nIn); } DATATYPE pop() { if (nOut >= nIn) return(0xffff); int i = nOut % BUF_LEN; nOut++; return(buf[i]); } DATATYPE peek() // peek at last OUTPUT { int i = nOut % BUF_LEN; return(buf[i]); } DATATYPE peek(const int nBack) // peak at indicated prev INPUT, 0 is most recent { int i=nIn-1-nBack; if (i < 0) return 0; return(buf[i]); } inline int nPush() const { return(nIn); } inline int nPop() const { return(nOut);} inline int depth() const { return(nIn-nOut); } inline int maxDepth() const { return(BUF_LEN); } }; class TimeEventRingBuffer : public RingBuffer { protected: unsigned long t0; volatile int nShort; volatile DATATYPE shortBuf[MAX_SHORT]; public: void reset() { setZero(); nShort=0; RingBuffer::reset(); } TimeEventRingBuffer() { nShort=t0=0; } void push() { unsigned long tt = millis(); DATATYPE tNow = (DATATYPE)(tt-t0); // check for contact bounce DATATYPE t1 = peek(0); // prev recorded input DATATYPE t2 = peek(1); if ( tNow-t1 < 0.1 * (t1-t2) ) { // short trigger, likely contact bounce if (nShort < MAX_SHORT) { shortBuf[nShort++]=tNow; return; } // Too many short triggers in a row, dump them for (int i=0; i < MAX_SHORT; i++) RingBuffer::push(shortBuf[i]); } // record the time of this event RingBuffer::push(tNow); nShort=0; // this event was good. reset short-trigger counter } void setZero() { t0 = millis(); } }; TimeEventRingBuffer Data; bool RecordingOn; // ISR when wheel sensor event is detected void wheelSense() { if (RecordingOn) { Data.push(); } digitalWrite(PIN_LED_SENSOR,digitalRead(PIN_LED_SENSOR)?LOW:HIGH); } void setup() { pinMode(2,INPUT); // hard-coded to pin 2, since using standard ext. interrupt 0 pinMode(PIN_RECORD,INPUT); digitalWrite(PIN_RECORD,HIGH); // enable pull-up resistor digitalWrite(2,HIGH); pinMode(PIN_LED_RECORD, OUTPUT); pinMode(PIN_LED_SENSOR, OUTPUT); digitalWrite(PIN_LED_RECORD,HIGH); digitalWrite(PIN_LED_SENSOR,HIGH); RecordingOn = true;//false; attachInterrupt(0,wheelSense,RISING); // INT0 is on pin 2 (INT1 on pin 3) Serial.begin(9600); // may want a different serial monitor, which can be faster } void loop() { Log.print(); // check if any log messages need to be printed if (!Data.empty()) { Serial.print(Data.nPop()); Serial.print("\t"); Serial.println(Data.pop()); Serial.flush(); } // check if recording is currently enabled bool rec = (digitalRead(PIN_RECORD)==LOW)?true:false; //rec=true;// always record for testing if (RecordingOn) { if (!rec) { // turn recording OFF digitalWrite(PIN_LED_RECORD,LOW); RecordingOn = false; delay(2); // avoid contact bounce } } else { // recording is off if (rec) { // transition from off to on, start recording digitalWrite(PIN_LED_RECORD,HIGH); Data.setZero(); if (Data.empty()) Data.reset(); RecordingOn = true; delay(2); // avoid contact bounce } } }
Voici un script LINUX pratique pour afficher et enregistrer les données d’une connexion série. Ce code est défini pour une connexion au port série/USB, mais si vous changez le périphérique, il cherche quelque chose comme /dev/rfcomm0, il peut être mis en place pour travailler sur un appareil Bluetooth/SPP.
#!/usr/bin/perl -w # Logs output from an arduino at typical 9600 8-n-1 # assume most recently created tty is the Arduino. # for most users, this should usually work $devName = `ls -t /dev/tty* | head -1`; chomp($devName); print "Listening on $devName\n"; # set up port for typical Arduino (SerialMonitor-like) settings system("stty -F $devName cs8 9600 ignbrk -brkint -icrnl -imaxbel -opost -onlcr -isig -icanon -iexten -echo -echoe -echok -echoctl -echoke noflsh -ixon -crtscts"); $logFileName = ($#ARGV>=0) ? $ARGV[0] : "/tmp/serial.log"; print "Logging to $logFileName\n"; $pid = fork(); if ($pid==0) { # this is the child. local $cmd = "tail -f $devName > $logFileName"; # for some reason, the above did not work on a netbook, but this did: #local $cmd = "cat $devName > $logFileName"; print "$cmd\n"; exec($cmd); } else { # this is the parent, display log. # hopefully when this is ^C'ed or killed, it will kill child too sleep 2; local $cmd = "tail -f $logFileName"; print "$cmd\n"; exec($cmd); }