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Build-for-RPi2-Linux.md

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IoT.js supports two build types:

  1. Build on your desktop. We support Linux(Ubuntu) and macOS. - Cross compile
  2. Build on Raspberry Pi 2.

Setting Raspberry Pi

IoT.js officially supports Raspbian. For more information, please visit the official site.

Enable the I2C interface

To use I2C module, the I2C interface must be enabled.

From the command line type:

sudo raspi-config

This will launch raspi-config utility.

  • Select "9 Advanced Options"
  • Select "A6 I2C"

The screen will ask you to enable I2C interface.

  • Select "Yes"
  • Select "Ok"
  • Select "Finish" to return to the command line.

Reboot your Raspberry Pi.

Enable the PWM interface

Raspberry Pi2 has two PWM outputs on the following pins.

PWM Number GPIO PIN(FUNC)
PWM0 GPIO12(4), GPIO18(2)
PWM1 GPIO13(4), GPIO19(2)

To use PWM module, you must add PWM overlays in /boot/config.txt file.

For example, to get a single PWM on GPIO18, add overlays like below.

dtoverlay=pwm,pin=18,func=2

For example, to get multi PWM on GPIO18 and GPIO19, add overlays like below.

dtoverlay=pwm-2chan,pin=18,func=2,pin2=19,func2=2

For more information about overlays, refer to README.

  • Note that it is necessary to have root privileges in order to run PWM module.

Enable the UART interface

To use UART module, the UART interface must be enabled.

In /boot/config.txt file, change the value of enable_uart from 0 to 1.

enable_uart=1

To disable the serial console, edit the file /boot/cmdline.txt. remove the word phase "console=serial0,115200" or "console=ttyAMA0,115200"

To enable the serial console, edit the file /boot/cmdline.txt. add the word phase "console=serial0,115200" or "console=ttyAMA0,115200"

Reboot your Raspberry Pi.

  • Note for Raspberry Pi 3 : You should use /dev/ttyS0 instead of /dev/ttyAMA0 in RPI3.

Build IoT.js on your desktop.

Prerequisite

Linux

Install arm linux cross compiler.

sudo apt-get install gcc-arm-linux-gnueabihf
macOS

Install arm linux cross compiler via this site.

The default location for arm linux compiler toolchain is "/usr/local/linaro/arm-linux-gnueabihf-raspbian".

Then you need to locate c_compiler. In "./cmake/config/arm-linux.cmake",

SET(EXTERNAL_CMAKE_C_COMPILER
    /usr/local/linaro/arm-linux-gnueabihf-raspbian/bin/arm-linux-gnueabihf-gcc)

In "./deps/libtuv/cmake/config/config_arm-linux.cmake",

SET(CMAKE_C_COMPILER
    /usr/local/linaro/arm-linux-gnueabihf-raspbian/bin/arm-linux-gnueabihf-gcc)

Build IoT.js (Cross compile)

Give target-arch, target-os and target-board options to the script named 'build.py', then the script do the rest for you.

./tools/build.py --buildtype=[release|debug] --target-arch=arm \
 --target-os=linux --target-board=rpi2

Running in Raspberry Pi 2

This script gives you build/arm-linux/release/bin/iotjs or build/arm-linux/debug/bin/iotjs. Copy this binary with your favorite tool or scp like below.

scp build/arm-linux/release/bin/iotjs pi@(your RPi2 IP):/home/pi/.

Lastly, open a shell and run with your test program.

ssh pi@(your RPi2 IP)
./iotjs (your test program)

Build IoT.js on Raspberry Pi 2

Prerequisite

Install cmake.

sudo apt-get update
sudo apt-get install cmake

Build IoT.js

Executing below command will build IoT.js and run our testsuite.

./tools/build.py --target-board=rpi2