mirror of
https://github.com/kidoman/embd
synced 2024-09-20 22:41:41 +02:00
223 lines
8.4 KiB
Markdown
223 lines
8.4 KiB
Markdown
# embd [![Build Status](https://travis-ci.org/kidoman/embd.svg?branch=master)](https://travis-ci.org/kidoman/embd) [![GoDoc](http://godoc.org/github.com/kidoman/embd?status.png)](http://godoc.org/github.com/kidoman/embd)
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A superheroic hardware abstraction layer for doing embedded programming on supported platforms like the Raspberry Pi and BeagleBone Black.
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Development supported and sponsored by [**ThoughtWorks**](http://www.thoughtworks.com/)
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## Getting Started
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After installing Go* and setting up your [GOPATH](http://golang.org/doc/code.html#GOPATH), create your first .go file. We'll call it ```simpleblinker.go```.
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```
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package main
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import (
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"time"
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"github.com/kidoman/embd"
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_ "github.com/kidoman/embd/host/rpi"
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)
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func main() {
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for {
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embd.LEDToggle(0)
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time.Sleep(250 * time.Millisecond)
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}
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}
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```
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Then install the EMBD package+dependency (go1.2 and greater is required):
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$ go get github.com/golang/glog
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$ go get github.com/kidoman/embd
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Build the binary*:
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$ export GOOS=linux
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$ export GOARCH=arm
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$ go build simpleblinker.go
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Copy the cross-compiled binary to your RaspberryPi*:
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$ scp simpleblinker pi@192.168.2.2:~
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Then run the program with ```sudo```*:
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$ sudo ./simpleblinker
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You will now see the green LED (next to the always on power LED) blink every 1/4 sec.
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**<nowiki>*</nowiki> Notes**
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* Please install the cross compilers. Mac users: ```brew install go --cross-compile-common```. [goxc](https://github.com/laher/goxc) can be a big help as well
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* We are instructing the ```go``` compiler to create a binary which will run on the RaspberryPi processor
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* Assuming your RaspberryPi has an IP address of ```192.168.2.2```. Substitute as necessary
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* ```sudo``` (root) permission is required as we are controlling the hardware by writing to special files
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* This sample program is optimized for brevity and does not clean up after itself. Click here to see the [full version](https://github.com/kidoman/embd/blob/master/samples/fullblinker.go)
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## Getting Help
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Join the [mailing list](https://groups.google.com/forum/#!forum/go-embd)
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## Platforms Supported
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* [RaspberryPi](http://www.raspberrypi.org/)
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* [BeagleBone Black](http://beagleboard.org/Products/BeagleBone%20Black)
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* [Intel Galileo](http://www.intel.com/content/www/us/en/do-it-yourself/galileo-maker-quark-board.html) **coming soon**
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* [Radxa](http://radxa.com/) **coming soon**
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* [Cubietruck](http://www.cubietruck.com/) **coming soon**
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* Bring Your Own **coming soon**
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## The command line tool
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go get github.com/kidoman/embd/embd
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will install a command line utility ```embd``` which will allow you to quickly get started with prototyping. The binary should be available in your ```$GOPATH/bin```. However, to be able to run this on a ARM based device, you will need to build it with ```GOOS=linux``` and ```GOARCH=arm``` environment variables set.
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But, since I am feeling so generous, a prebuilt/tested version is available for direct download and deployment [here](https://dl.dropboxusercontent.com/u/6727135/Binaries/embd/linux-arm/embd).
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For example, if you run ```embd detect``` on a **BeagleBone Black**:
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root@beaglebone:~# embd detect
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detected host BeagleBone Black (rev 0)
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Run ```embd``` without any arguments to discover the various commands supported by the utility.
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## How to use the framework
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Package **embd** provides a hardware abstraction layer for doing embedded programming
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on supported platforms like the Raspberry Pi and BeagleBone Black. Most of the examples below
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will work without change (i.e. the same binary) on all supported platforms. How cool is that?
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Although samples are all present in the [samples](https://github.com/kidoman/embd/tree/master/samples) folder,
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we will show a few choice examples here.
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Use the **LED** driver to toggle LEDs on the BBB:
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import "github.com/kidoman/embd"
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...
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embd.InitLED()
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defer embd.CloseLED()
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...
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led, err := embd.NewLED("USR3")
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...
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led.Toggle()
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Even shorter while prototyping:
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import "github.com/kidoman/embd"
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...
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embd.InitLED()
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defer embd.CloseLED()
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...
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embd.ToggleLED(3)
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NB: **3** == **USR3** for all intents and purposes. The driver is smart enough to figure all this out.
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BBB + **PWM**:
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import "github.com/kidoman/embd"
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...
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embd.InitGPIO()
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defer embd.CloseGPIO()
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...
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pwm, _ := embd.NewPWMPin("P9_14")
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defer pwm.Close()
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...
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pwm.SetDuty(1000)
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Control **GPIO** pins on the RaspberryPi / BeagleBone Black:
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import "github.com/kidoman/embd"
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...
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embd.InitGPIO()
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defer embd.CloseGPIO()
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...
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embd.SetDirection(10, embd.Out)
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embd.DigitalWrite(10, embd.High)
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Could also do:
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import "github.com/kidoman/embd"
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...
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embd.InitGPIO()
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defer embd.CloseGPIO()
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...
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pin, err := embd.NewDigitalPin(10)
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...
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pin.SetDirection(embd.Out)
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pin.Write(embd.High)
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Or read data from the **Bosch BMP085** barometric sensor:
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import "github.com/kidoman/embd"
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import "github.com/kidoman/embd/sensor/bmp085"
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...
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bus := embd.NewI2CBus(1)
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...
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baro := bmp085.New(bus)
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...
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temp, err := baro.Temperature()
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altitude, err := baro.Altitude()
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Even find out the heading from the **LSM303** magnetometer:
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import "github.com/kidoman/embd"
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import "github.com/kidoman/embd/sensor/lsm303"
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...
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bus := embd.NewI2CBus(1)
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...
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mag := lsm303.New(bus)
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...
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heading, err := mag.Heading()
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The above two examples depend on **I2C** and therefore will work without change on almost all
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platforms.
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## Protocols Supported
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* **Digital GPIO** [Documentation](http://godoc.org/github.com/kidoman/embd#DigitalPin)
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* **Analog GPIO** [Documentation](http://godoc.org/github.com/kidoman/embd#AnalogPin)
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* **PWM** [Documentation](http://godoc.org/github.com/kidoman/embd#PWMPin)
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* **I2C** [Documentation](http://godoc.org/github.com/kidoman/embd#I2CBus)
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* **LED** [Documentation](http://godoc.org/github.com/kidoman/embd#LED)
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## Sensors Supported
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* **TMP006** Thermopile sensor [Documentation](http://godoc.org/github.com/kidoman/embd/sensor/tmp006), [Datasheet](http://www.adafruit.com/datasheets/tmp006.pdf), [Userguide](http://www.adafruit.com/datasheets/tmp006ug.pdf)
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* **BMP085** Barometric pressure sensor [Documentation](http://godoc.org/github.com/kidoman/embd/sensor/bmp085), [Datasheet](https://www.sparkfun.com/datasheets/Components/General/BST-BMP085-DS000-05.pdf)
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* **BMP180** Barometric pressure sensor [Documentation](http://godoc.org/github.com/kidoman/embd/sensor/bmp180), [Datasheet](http://www.adafruit.com/datasheets/BST-BMP180-DS000-09.pdf)
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* **LSM303** Accelerometer and magnetometer [Documentation](http://godoc.org/github.com/kidoman/embd/sensor/lsm303), [Datasheet](https://www.sparkfun.com/datasheets/Sensors/Magneto/LSM303%20Datasheet.pdf)
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* **L3GD20** Gyroscope [Documentation](http://godoc.org/github.com/kidoman/embd/sensor/l3gd20), [Datasheet](http://www.adafruit.com/datasheets/L3GD20.pdf)
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* **US020** Ultrasonic proximity sensor [Documentation](http://godoc.org/github.com/kidoman/embd/sensor/us020), [Product Page](http://www.digibay.in/sensor/object-detection-and-proximity?product_id=239)
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* **BH1750FVI** Luminosity sensor [Documentation](http://godoc.org/github.com/kidoman/embd/sensor/us020), [Datasheet](http://www.elechouse.com/elechouse/images/product/Digital%20light%20Sensor/bh1750fvi-e.pdf)
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## Interfaces
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* **Keypad(4x3)** [Product Page](http://www.adafruit.com/products/419#Learn)
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## Controllers
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* **PCA9685** 16-channel, 12-bit PWM Controller with I2C protocol [Documentation](http://godoc.org/github.com/kidoman/embd/controller/pca9685), [Datasheet](http://www.adafruit.com/datasheets/PCA9685.pdf), [Product Page](http://www.adafruit.com/products/815)
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* **MCP4725** 12-bit DAC [Documentation](http://godoc.org/github.com/kidoman/embd/controller/mcp4725), [Datasheet](http://www.adafruit.com/datasheets/mcp4725.pdf), [Product Page](http://www.adafruit.com/products/935)
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* **ServoBlaster** RPi PWM/PCM based PWM controller [Documentation](http://godoc.org/github.com/kidoman/embd/controller/servoblaster), [Product Page](https://github.com/richardghirst/PiBits/tree/master/ServoBlaster)
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## Contributing
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We look forward to your pull requests, but contributions which abide by the [guidelines](https://github.com/kidoman/embd/blob/master/CONTRIBUTING.md) will get a free beer!
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File an [issue](https://github.com/kidoman/embd/issues), open a [pull request](https://github.com/kidoman/embd/pulls). We are waiting.
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## About
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EMBD is affectionately designed/developed by Karan Misra ([kidoman](https://github.com/kidoman)), Kunal Powar ([kunalpowar](https://github.com/kunalpowar)) and [FRIENDS](https://github.com/kidoman/embd/blob/master/AUTHORS).
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