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POPython- Firmata and Arduino, script structure effecting firmata
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  1. POPython- Firmata and Arduino, script structure effecting firmata
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    copied!<p>When using this script to blink an LED on pin12, the script will not get past line27 where pin12 is set high. There is no error message.</p> <pre><code> import json import urllib from firmata import * from pprint import pprint import time import serial countTweet = 0 a = Arduino('COM13') #Insert this before the while loop = it never actually works a.delay(2) while True: try: response = urllib.urlopen('http://search.twitter.com/search.json?q=%23happy&amp;result_type=recent&amp;rpp=1&amp;filter:retweets').read() except IOError: pprint('no internet connection') time.sleep(5) continue j = json.loads(response) if j['results']: text = j['results'][0]['text'] tID = j['results'][0]['id'] else: pprint('bad JSON') if countTweet != 0 and lastID != tID: pprint('new ID') a.pin_mode(12, firmata.OUTPUT) #Gets stuck here a.delay(2) a.digital_write(12, firmata.HIGH) a.delay(2) a.digital_write(12, firmata.LOW) pprint('done firmata') lastID = tID pprint (text) pprint ('1') else: pprint("FLC") #First loop complete: To gather the existing tweet before we start lastID = tID countTweet += 1 time.sleep(15) </code></pre> <p>How do I structure this script so that Firmata/Serial works on each loop? I am interested to learn why the above script doesn't work at all but the LED example below will.</p> <pre><code> from firmata import * a = Arduino('COM13') a.pin_mode(12, firmata.OUTPUT) a.delay(2) while True: a.digital_write(12, firmata.HIGH) a.delay(2) a.digital_write(12, firmata.LOW) a.delay(2) </code></pre> <p>The Arduino is running oldStandardFirmata </p> <pre><code>#include &lt;EEPROM.h&gt; #include &lt;Firmata.h&gt; /*============================================================================== * GLOBAL VARIABLES *============================================================================*/ /* analog inputs */ int analogInputsToReport = 0; // bitwise array to store pin reporting int analogPin = 0; // counter for reading analog pins /* digital pins */ byte reportPINs[TOTAL_PORTS]; // PIN == input port byte previousPINs[TOTAL_PORTS]; // PIN == input port byte pinStatus[TOTAL_PINS]; // store pin status, default OUTPUT byte portStatus[TOTAL_PORTS]; /* timer variables */ unsigned long currentMillis; // store the current value from millis() unsigned long previousMillis; // for comparison with currentMillis /*============================================================================== * FUNCTIONS *============================================================================*/ void outputPort(byte portNumber, byte portValue) { portValue = portValue &amp;~ portStatus[portNumber]; if(previousPINs[portNumber] != portValue) { Firmata.sendDigitalPort(portNumber, portValue); previousPINs[portNumber] = portValue; Firmata.sendDigitalPort(portNumber, portValue); } } /* ----------------------------------------------------------------------------- * check all the active digital inputs for change of state, then add any events * to the Serial output queue using Serial.print() */ void checkDigitalInputs(void) { byte i, tmp; for(i=0; i &lt; TOTAL_PORTS; i++) { if(reportPINs[i]) { switch(i) { case 0: outputPort(0, PIND &amp;~ B00000011); break; // ignore Rx/Tx 0/1 case 1: outputPort(1, PINB); break; case 2: outputPort(2, PINC); break; } } } } // ----------------------------------------------------------------------------- /* sets the pin mode to the correct state and sets the relevant bits in the * two bit-arrays that track Digital I/O and PWM status */ void setPinModeCallback(byte pin, int mode) { byte port = 0; byte offset = 0; if (pin &lt; 8) { port = 0; offset = 0; } else if (pin &lt; 14) { port = 1; offset = 8; } else if (pin &lt; 22) { port = 2; offset = 14; } if(pin &gt; 1) { // ignore RxTx (pins 0 and 1) pinStatus[pin] = mode; switch(mode) { case INPUT: pinMode(pin, INPUT); portStatus[port] = portStatus[port] &amp;~ (1 &lt;&lt; (pin - offset)); break; case OUTPUT: digitalWrite(pin, LOW); // disable PWM case PWM: pinMode(pin, OUTPUT); portStatus[port] = portStatus[port] | (1 &lt;&lt; (pin - offset)); break; //case ANALOG: // TODO figure this out default: Firmata.sendString(""); } // TODO: save status to EEPROM here, if changed } } void analogWriteCallback(byte pin, int value) { setPinModeCallback(pin,PWM); analogWrite(pin, value); } void digitalWriteCallback(byte port, int value) { switch(port) { case 0: // pins 2-7 (don't change Rx/Tx, pins 0 and 1) // 0xFF03 == B1111111100000011 0x03 == B00000011 PORTD = (value &amp;~ 0xFF03) | (PORTD &amp; 0x03); break; case 1: // pins 8-13 (14,15 are disabled for the crystal) PORTB = (byte)value; break; case 2: // analog pins used as digital PORTC = (byte)value; break; } } // ----------------------------------------------------------------------------- /* sets bits in a bit array (int) to toggle the reporting of the analogIns */ //void FirmataClass::setAnalogPinReporting(byte pin, byte state) { //} void reportAnalogCallback(byte pin, int value) { if(value == 0) { analogInputsToReport = analogInputsToReport &amp;~ (1 &lt;&lt; pin); } else { // everything but 0 enables reporting of that pin analogInputsToReport = analogInputsToReport | (1 &lt;&lt; pin); } // TODO: save status to EEPROM here, if changed } void reportDigitalCallback(byte port, int value) { reportPINs[port] = (byte)value; if(port == 2) // turn off analog reporting when used as digital analogInputsToReport = 0; } /*============================================================================== * SETUP() *============================================================================*/ void setup() { byte i; Firmata.setFirmwareVersion(2, 0); Firmata.attach(ANALOG_MESSAGE, analogWriteCallback); Firmata.attach(DIGITAL_MESSAGE, digitalWriteCallback); Firmata.attach(REPORT_ANALOG, reportAnalogCallback); Firmata.attach(REPORT_DIGITAL, reportDigitalCallback); Firmata.attach(SET_PIN_MODE, setPinModeCallback); portStatus[0] = B00000011; // ignore Tx/RX pins portStatus[1] = B11000000; // ignore 14/15 pins portStatus[2] = B00000000; // for(i=0; i&lt;TOTAL_PINS; ++i) { // TODO make this work with analogs for(i=0; i&lt;14; ++i) { setPinModeCallback(i,OUTPUT); } // set all outputs to 0 to make sure internal pull-up resistors are off PORTB = 0; // pins 8-15 PORTC = 0; // analog port PORTD = 0; // pins 0-7 // TODO rethink the init, perhaps it should report analog on default for(i=0; i&lt;TOTAL_PORTS; ++i) { reportPINs[i] = false; } // TODO: load state from EEPROM here /* send digital inputs here, if enabled, to set the initial state on the * host computer, since once in the loop(), this firmware will only send * digital data on change. */ if(reportPINs[0]) outputPort(0, PIND &amp;~ B00000011); // ignore Rx/Tx 0/1 if(reportPINs[1]) outputPort(1, PINB); if(reportPINs[2]) outputPort(2, PINC); Firmata.begin(115200); } /*============================================================================== * LOOP() *============================================================================*/ void loop() { /* DIGITALREAD - as fast as possible, check for changes and output them to the * FTDI buffer using Serial.print() */ checkDigitalInputs(); currentMillis = millis(); if(currentMillis - previousMillis &gt; 20) { previousMillis += 20; // run this every 20ms /* SERIALREAD - Serial.read() uses a 128 byte circular buffer, so handle * all serialReads at once, i.e. empty the buffer */ while(Firmata.available()) Firmata.processInput(); /* SEND FTDI WRITE BUFFER - make sure that the FTDI buffer doesn't go over * 60 bytes. use a timer to sending an event character every 4 ms to * trigger the buffer to dump. */ /* ANALOGREAD - right after the event character, do all of the * analogReads(). These only need to be done every 4ms. */ for(analogPin=0;analogPin&lt;TOTAL_ANALOG_PINS;analogPin++) { if( analogInputsToReport &amp; (1 &lt;&lt; analogPin) ) { Firmata.sendAnalog(analogPin, analogRead(analogPin)); } } } } </code></pre>
 

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