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#Node.js Sample Learn to run node.js on a galileo and call APIs from a javscript file.

##Running Node on Galileo

1. Make sure you are using the latest windows image{:target="_blank"}.
2. Make a directory in the root of your image named node:
   • Using File Explorer on your PC, open \\mygalileo\c$ then right click and create a new folder called node
3. Download the 32-bit Windows Binary (.exe) of node from nodejs.org{:target="_blank"} and place it inside the new node directory.
4. Download the latest zipped version of npm from nodejs.org{:target="_blank"} and extract the contents into the new node directory.
5. Build User32.dll using the Forwarders project.
6. Copy User32.dll from the Forwarders project release directory into the node directory.
7. Using Telnet, add this node folder to your Galileo image's path and restart using the following commands:

setx path "%path%;c:\node" /M
shutdown /r /t 0

• Create a main.js with contents from the code section below.
  • Using File Explorer on your PC, open \\mygalileo\c$ then right click and create a new text file called main.js
  • You can open this file directly from a text editor by navigating to \\mygalileo\c$\main.js in a File Explorer.
• Install the ms-iot-wiring package into the location of main.js using npm:

npm install ms-iot-wiring

• Using a telnet connection to your galileo, change directories to the location of main.js.
• Run the command: node main.js

##Code The code below shows usage of the APIs available through the ms-iot-wiring extension.

{% highlight Javascript %} var galileo = require("./ms-iot-wiring"); // adds the ms-iot-wiring module

var led = 13;

// setup galileo.ioInit(); // needs to be done in order to initialize the board and pins galileo.pinMode(led, galileo.OUTPUT); // sets pin 13 to output

// loop while (1) { // Global Variables console.log('----- Global Variables -----'); console.log("LOW: %d", galileo.LOW); console.log("HIGH: %d", galileo.HIGH);

console.log("INPUT: %d", galileo.INPUT); console.log("OUTPUT: %d", galileo.OUTPUT); console.log("INPUT_PULLUP: %d", galileo.INPUT_PULLUP);

console.log("CHANGE: %d", galileo.CHANGE); console.log("FALLING: %d", galileo.FALLING); console.log("RISING: %d", galileo.RISING);

console.log("LSBFIRST: %d", galileo.LSBFIRST); console.log("MSBFIRST: %d", galileo.MSBFIRST);

console.log("WLED: %d", galileo.WLED); console.log("LED_BUILTIN: %d", galileo.LED_BUILTIN);

console.log("PI: %d", galileo.PI); console.log("HALF_PI: %d", galileo.HALF_PI); console.log("TWO_PI: %d", galileo.TWO_PI);

// Digital Tests console.log('\n----- Digital Tests -----'); console.log('Digital Write'); galileo.digitalWrite(13, 0); console.log("LED OFF"); console.log('Delay 1 seconds'); galileo.delay(1000); galileo.digitalWrite(13, 1); console.log("LED ON"); console.log('DelayMicroseconds for 1 second'); galileo.delayMicroseconds(1000000);

console.log('Digital Read'); galileo.digitalRead(2);

console.log('Millis: %d', galileo.millis()); console.log('Micros: %d', galileo.micros());

// shift in: datapin, clockpin, bitorder console.log('ShiftIn'); galileo.shiftIn(1, 2, galileo.LSBFIRST); console.log('ShiftOut'); galileo.shiftOut(1, 2, galileo.LSBFIRST, 10);

// Analog Tests console.log('\n----- Analog Tests -----'); console.log('AnalogWriteResolution'); galileo.analogWriteResolution(12); console.log('AnalogReadResolution'); galileo.analogReadResolution(12); console.log('AnalogWrite'); galileo.analogWrite(3, 4095);

console.log("Temperature: "); var temp = galileo.analogRead(-1); console.log(temp); console.log("\n");

console.log('Tone with 2 arguments on pin 10'); galileo.tone(10, 300); console.log('1 second delay'); galileo.delay(1000); console.log('NoTone on pin 10:'); galileo.noTone(10); console.log('1 second delay'); galileo.delay(1000); console.log('Tone with 3 arguments on pin 10 duration is 1 second'); galileo.tone(10, 300, 1000); console.log('5 second delay'); galileo.delay(5000);

// SPI Tests console.log('\n----- SPI Tests -----'); var spi = galileo.Spi(); console.log('Checking whether SPI is defined: ' + spi); console.log('Calling Spi Begin'); spi.begin(); console.log('Calling Spi SetDataMode'); spi.setDataMode(galileo.SPI_MODE1); console.log('Calling Spi SetClockDivider'); spi.setClockDivider(galileo.SPI_CLOCK_DIV64); console.log('Calling Spi SetBitOrder'); spi.setBitOrder(galileo.LSBFIRST); console.log('Calling Spi Transfer'); spi.transfer(10); console.log('Calling Spi End'); spi.end();

// Wire/I2C Tests console.log('\n----- Wire/I2C Tests -----'); var wire = galileo.Wire(); console.log('Wire Begin'); wire.begin();

console.log('\nWire BeginTransmission'); wire.beginTransmission(0x20); // transmit to device, device address is specified in datasheet console.log('Wire Write: 1 integer argument'); console.log('Wrote: ' + wire.write(10) + ' bytes'); console.log('Wire Write: 1 string argument'); console.log('Wrote: ' + wire.write("Hello") + ' bytes'); console.log('Wire Write: 2 arguments'); var array = [0x01, 0x02, 0x03, 0x04]; console.log('Wrote ' + wire.write(array, 4) + ' bytes');

console.log('\nWire EndTransmission'); console.log('Status of transmission: ' + wire.endTransmission()); console.log('Wire EndTransmission with true stop'); console.log('Status of transmission: ' + wire.endTransmission(true)); console.log('Wire EndTransmission with false stop'); console.log('Status of transmission: ' + wire.endTransmission(false)); console.log('Return values:'); console.log('0:success'); console.log('1:data too long to fit in transmit buffer'); console.log('2:received NACK on transmit of address'); console.log('3:received NACK on transmit of data'); console.log('4:other error\n');

console.log('Wire RequestFrom with 2 paramaters: address and quantity'); console.log('bytes ready: ' + wire.requestFrom(0x20, 1)); console.log('Wire RequestFrom with 2 paramaters: address and quantity'); console.log('bytes ready: ' + wire.requestFrom(0x20, 1)); console.log('Wire RequestFrom with 3 paramaters: address, quantity, and true stop'); console.log('bytes ready: ' + wire.requestFrom(0x20, 1, true)); // stop is a boolean. true will send a stop message where false will restart the connection keeping it active console.log('Wire RequestFrom with 3 paramaters: address, quantity, and false stop'); console.log('bytes ready: ' + wire.requestFrom(0x20, 1, false));

console.log('Wire Available'); console.log('Available bytes: ' + wire.available()); console.log('Wire Read'); console.log('Read: ' + wire.read()); console.log('Wire OnReceive'); wire.onReceive(); console.log('Wire OnRequest'); wire.onRequest();

console.log('\n----- End of Loop -----\n\n'); galileo.delay(5000); }

{% endhighlight %}

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