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    <hostdev mode='subsystem' type='usb' managed='no'>
      <source>
        <address bus='2' device='4'/>
      </source>
    </hostdev>

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from arduino_proxy.proxy import ArduinoProxy

proxy = ArduinoProxy('/dev/ttyACM0')
print "Memoria libre:", proxy.getFreeMemory()

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class ArduinoProxy(object):

    (...)

    def getFreeMemory(self):
        val = self.send_cmd("_gFM")
        return val
    
    getFreeMemory.arduino_function_name = '_gFM'
    getFreeMemory.arduino_code = """

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var ram = proxy.globalData()['arduino_type_struct']['ram_size_bytes'];
var free = proxy.getFreeMemory();
var pc = Math.floor((free/ram)*100);
logMessage("Free ram: " + free + " bytes of " + ram + " bytes (" + pc + "% free).");

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/***********************************************************************
 * First example. Testing how to use LM335 to read temperature,
 * using PyArduinoProxy.
 ***********************************************************************/

var value = proxy.analogRead(0);
logMessage("analogRead(): " + value);

var volt = (5.0/1024.0) * value;
logMessage("volt: +" + volt +"V");

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/*
 * FIRST EXAMPLE
 */

var i;
for(i=2; i<=5; i++) {
    proxy.pinMode(i, OUTPUT);
}

var j;

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# Test 74HC164 shift register
import time
from arduino_proxy import ArduinoProxy

def blink():
    print "blink()"
    proxy.shiftOut(10, 11, ArduinoProxy.LSBFIRST, 0)
    time.sleep(0.5)
    proxy.shiftOut(10, 11, ArduinoProxy.LSBFIRST, 255)
    time.sleep(0.5)

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#define PIN_ONBOARD_LED 13  // DIGITAL
#define PIN_START_BUTTON 12 // DIGITAL

void setup() {                
  // Pin 13 has an LED connected on most Arduino boards.
  pinMode(PIN_ONBOARD_LED, OUTPUT);
  pinMode(PIN_START_BUTTON, INPUT);

  wait_start();

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import random

def rnd_byte():
    return chr(random.randint(0, 255))

class FakeReadOnlyBinaryFile:
    """
    File-like object for reading random data. The ammount of data to generate
    is specified when the object is created.
    

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class SomeTest(unittest.TestCase):

    .
    .
    .

    def test_queue(self):
        
        .