go-embedded/embd
go-embedded/embd
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Karan Misra 2014-03-23 15:47:58 +05:30
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96
README.md
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@ -1,19 +1,99 @@
# embd [![Build Status](https://travis-ci.org/kidoman/embd.png?branch=master)](https://travis-ci.org/kidoman/embd)
# embd [![Build Status](https://travis-ci.org/kidoman/embd.png?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)
Golang Embedded Programming Framework
Supercharged Embedded Programming Framework
## Documentation
[![GoDoc](http://godoc.org/github.com/kidoman/embd?status.png)](http://godoc.org/github.com/kidoman/embd)
## Hosts supported
## Platforms supported
* [RaspberryPi](http://www.raspberrypi.org/)
* [BeagleBone Black](http://beagleboard.org/Products/BeagleBone%20Black)
* [Intel Galileo](http://www.intel.com/content/www/us/en/do-it-yourself/galileo-maker-quark-board.html) **coming soon**
* [Radxa](http://radxa.com/) **coming soon**
* [Cubietruck](http://www.cubietruck.com/) **coming soon**
* Bring Your Own **coming soon**
## How to use
Package embd provides a supercharged hardware abstraction layer for doing embedded programming
on supported platforms like the Raspberry Pi and BeagleBone Black. Most of the examples below
will work without change (i.e. the same binary) on all supported platforms. How cool is that?
Although samples are all present in the [samples](https://github.com/kidoman/embd/tree/master/samples) folder,
we will show a few choice examples here.
Use the LED driver to toggle LEDs on the BBB:
import "github.com/kidoman/embd"
...
embd.InitLED()
defer embd.CloseLED()
...
led, err := embd.NewLED("USR3")
...
led.Toggle()
Even shorter while prototyping:
import "github.com/kidoman/embd"
...
embd.InitLED()
defer embd.CloseLED()
...
embd.ToggleLED(3)
Control GPIO pins on the RaspberryPi / BeagleBone Black:
import "github.com/kidoman/embd"
...
embd.InitGPIO()
defer embd.CloseGPIO()
...
embd.SetDirection(10, embd.Out)
embd.DigitalWrite(10, embd.High)
Could also do:
import "github.com/kidoman/embd"
...
embd.InitGPIO()
defer embd.CloseGPIO()
...
pin, err := embd.NewDigitalPin(10)
...
pin.SetDirection(embd.Out)
pin.Write(embd.High)
Or read data from the Bosch BMP085 barometric sensor:
import "github.com/kidoman/embd"
import "github.com/kidoman/embd/sensor/bmp085"
...
bus := embd.NewI2CBus(1)
...
baro := bmp085.New(bus)
...
temp, err := baro.Temperature()
altitude, err := baro.Altitude()
Even find out the heading from the LSM303 magnetometer:
import "github.com/kidoman/embd"
import "github.com/kidoman/embd/sensor/lsm303"
...
bus := embd.NewI2CBus(1)
...
mag := lsm303.New(bus)
...
heading, err := mag.Heading()
The above two examples depend on I2C and therefore will work without change on almost all
platforms.
## Protocols supported
* **I2C** [Documentation](http://godoc.org/github.com/kidoman/embd/i2c)
* **Digital GPIO** [Documentation](http://godoc.org/github.com/kidoman/embd#DigitalPin)
* **Analog GPIO** [Documentation](http://godoc.org/github.com/kidoman/embd#AnalogPin)
* **I2C** [Documentation](http://godoc.org/github.com/kidoman/embd#I2CBus)
* **LED** [Documentation](http://godoc.org/github.com/kidoman/embd#LED)
## Sensors supported

4
controller/pca9685/pca9685.go
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@ -6,6 +6,7 @@ import (
"math"
"sync"
"time"
"github.com/kidoman/embd"
"github.com/kidoman/embd/util"
)
@ -155,11 +156,14 @@ func (d *PCA9685) SetPwm(channel, onTime, offTime int) (err error) {
return
}
// SetMicroseconds is a convinience method which allows easy servo control.
func (d *PCA9685) SetMicroseconds(channel, us int) (err error) {
offTime := us * d.Freq * pwmControlPoints / 1000000
return d.SetPwm(channel, 0, offTime)
}
// SetAnalog is a convinience method which allows easy manipulation of the PWM
// based on a (0-255) range value.
func (d *PCA9685) SetAnalog(channel int, value byte) (err error) {
offTime := util.Map(int64(value), minAnalogValue, maxAnalogValue, 0, pwmControlPoints-1)
return d.SetPwm(channel, 0, int(offTime))

85
doc.go
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@ -1,29 +1,74 @@
/*
Package rpi provides modules which will help gophers deal with various sensors.
Package embd provides a supercharged hardware abstraction layer for doing embedded programming
on supported platforms like the Raspberry Pi and BeagleBone Black. Most of the examples below
will work without change (i.e. the same binary) on all supported platforms. How cool is that?
Use the default i2c bus to read/write data:
Use the LED driver to toggle LEDs on the BBB:
import "github.com/kidoman/embd/i2c"
...
value, err := i2c.ReadInt(0x1E, 0x03)
...
value := make([]byte, 6)
err := i2c.ReadFromReg(0x77, 0xF6, value)
...
err := i2c.WriteToReg(0x1E, 0x02, 0x00)
import "github.com/kidoman/embd"
...
embd.InitLED()
defer embd.CloseLED()
...
led, err := embd.NewLED("USR3")
...
led.Toggle()
Read data from the BMP085 sensor:
Even shorter while prototyping:
import "github.com/kidoman/embd/sensor/bmp085"
...
temp, err := bmp085.Temperature()
...
altitude, err := bmp085.Altitude()
import "github.com/kidoman/embd"
...
embd.InitLED()
defer embd.CloseLED()
...
embd.ToggleLED(3)
Find out the heading from the LSM303 magnetometer:
Control GPIO pins on the RaspberryPi / BeagleBone Black:
import "github.com/kidoman/embd/sensor/lsm303"
...
heading, err := lsm303.Heading()
import "github.com/kidoman/embd"
...
embd.InitGPIO()
defer embd.CloseGPIO()
...
embd.SetDirection(10, embd.Out)
embd.DigitalWrite(10, embd.High)
Could also do:
import "github.com/kidoman/embd"
...
embd.InitGPIO()
defer embd.CloseGPIO()
...
pin, err := embd.NewDigitalPin(10)
...
pin.SetDirection(embd.Out)
pin.Write(embd.High)
Or read data from the Bosch BMP085 barometric sensor:
import "github.com/kidoman/embd"
import "github.com/kidoman/embd/sensor/bmp085"
...
bus := embd.NewI2CBus(1)
...
baro := bmp085.New(bus)
...
temp, err := baro.Temperature()
altitude, err := baro.Altitude()
Even find out the heading from the LSM303 magnetometer:
import "github.com/kidoman/embd"
import "github.com/kidoman/embd/sensor/lsm303"
...
bus := embd.NewI2CBus(1)
...
mag := lsm303.New(bus)
...
heading, err := mag.Heading()
The above two examples depend on I2C and therefore will work without change on almost all
platforms.
*/
package embd

2
samples/led.go
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@ -1,5 +1,7 @@
// +build ignore
// LED example, works OOTB on a BBB.
package main
import (

2
samples/ledshort.go
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@ -1,5 +1,7 @@
// +build ignore
// Short LED example, works OOTB on a BBB.
package main
import (

8
sensor/bh1750fvi/bh1750fvi.go
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@ -1,4 +1,4 @@
// Package BH1750FVI allows interfacing with the BH1750FVI ambient light sensor through I2C protocol.
// Package BH1750FVI allows interfacing with the BH1750FVI ambient light sensor through I2C.
package bh1750fvi
import (
@ -25,6 +25,7 @@ const (
pollDelay = 150
)
// BH1750FVI represents a BH1750FVI ambient light sensor.
type BH1750FVI struct {
Bus embd.I2CBus
Poll int
@ -38,6 +39,7 @@ type BH1750FVI struct {
operationCode byte
}
// New returns a BH1750FVI sensor at the specific resolution mode.
func New(mode string, bus embd.I2CBus) *BH1750FVI {
switch mode {
case High:
@ -49,12 +51,12 @@ func New(mode string, bus embd.I2CBus) *BH1750FVI {
}
}
// NewHighMode returns a BH1750FVI inteface on high resolution mode (1lx resolution)
// NewHighMode returns a BH1750FVI sensor on high resolution mode (1lx resolution)
func NewHighMode(bus embd.I2CBus) *BH1750FVI {
return New(High, bus)
}
// NewHighMode returns a BH1750FVI inteface on high resolution mode2 (0.5lx resolution)
// NewHighMode returns a BH1750FVI sensor on high resolution mode2 (0.5lx resolution)
func NewHigh2Mode(bus embd.I2CBus) *BH1750FVI {
return New(High2, bus)
}

2
sensor/bmp085/bmp085.go
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@ -38,6 +38,7 @@ const (
pollDelay = 250
)
// BMP085 represents a Bosch BMP085 barometric sensor.
type BMP085 struct {
Bus embd.I2CBus
Poll int
@ -59,6 +60,7 @@ type BMP085 struct {
quit chan struct{}
}
// New returns a handle to a BMP085 sensor.
func New(bus embd.I2CBus) *BMP085 {
return &BMP085{Bus: bus, Poll: pollDelay}
}

2
sensor/bmp180/bmp180.go
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@ -38,6 +38,7 @@ const (
pollDelay = 250
)
// BMP180 represents a Bosch BMP180 barometric sensor.
type BMP180 struct {
Bus embd.I2CBus
Poll int
@ -59,6 +60,7 @@ type BMP180 struct {
quit chan struct{}
}
// New returns a handle to a BMP180 sensor.
func New(bus embd.I2CBus) *BMP180 {
return &BMP180{Bus: bus, Poll: pollDelay}
}

2
sensor/doc.go
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@ -1,2 +1,2 @@
// Package sensor contains the various sensors modules for use on your Raspberry Pi.
// Package sensor contains the various sensors modules for use on your platform.
package sensor

2
sensor/l3gd20/l3gd20.go
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@ -316,6 +316,7 @@ func (d *L3GD20) Temperature() (temp int, err error) {
return
}
// Orientations returns a channel which will have the current temperature reading.
func (d *L3GD20) Orientations() (orientations <-chan Orientation, err error) {
if err = d.setup(); err != nil {
return
@ -366,6 +367,7 @@ func (d *L3GD20) Start() (err error) {
return
}
// Stop the data acquisition loop.
func (d *L3GD20) Stop() (err error) {
if d.closing != nil {
waitc := make(chan struct{})

1
sensor/lsm303/lsm303.go
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@ -42,6 +42,7 @@ const (
pollDelay = 250
)
// LSM303 represents a LSM303 magnetometer.
type LSM303 struct {
Bus embd.I2CBus
Poll int

1
sensor/tmp006/tmp006.go
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@ -8,6 +8,7 @@ import (
"math"
"sync"
"time"
"github.com/kidoman/embd"
)

3
sensor/watersensor/watersensor.go
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@ -1,4 +1,4 @@
// Package watersensor allows interfacing with the water sensor
// Package watersensor allows interfacing with the water sensor.
package watersensor
import (
@ -8,6 +8,7 @@ import (
"github.com/kidoman/embd"
)
// WaterSensor represents a water sensor.
type WaterSensor struct {
Pin embd.DigitalPin