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gpio.go
executable file
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gpio.go
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// +build ignore
//+build !linux,!arm
// Ignore this file for now, but it would be nice to get GPIO going natively
package main
import (
"encoding/json"
"io/ioutil"
"log"
"os"
"os/signal"
)
var (
gpio GPIO
)
type GPIO struct {
pinStates map[string]PinState
pinStateChanged chan PinState
pinAdded chan PinState
pinRemoved chan string
}
type Direction int
type PullUp int
type PinState struct {
Pin interface{} `json:"-"`
PinId string
Dir Direction
State byte
Pullup PullUp
Name string
}
type PinDef struct {
ID string
Aliases []string
Capabilities []string
DigitalLogical int
AnalogLogical int
}
const STATE_FILE = "pinstates.json"
const (
In Direction = 0
Out Direction = 1
PWM Direction = 2
Pull_None PullUp = 0
Pull_Up PullUp = 1
Pull_Down PullUp = 2
)
type GPIOInterface interface {
PreInit()
Init(chan PinState, chan PinState, chan string, map[string]PinState) error
Close() error
PinMap() ([]PinDef, error)
Host() (string, error)
PinStates() (map[string]PinState, error)
PinInit(string, Direction, PullUp, string) error
PinSet(string, byte) error
PinRemove(string) error
}
func (g *GPIO) CleanupGpio() {
pinStates, err := gpio.PinStates()
if err != nil {
log.Println("Error getting pinstates on cleanup: " + err.Error())
} else {
data, err := json.Marshal(pinStates)
if err != nil {
log.Println("Error marshalling pin states : " + err.Error())
}
ioutil.WriteFile(STATE_FILE, data, 0644)
}
gpio.Close()
os.Exit(1)
}
// I took what Ben had in his main.go file and moved it here
func (g *GPIO) PreInit() {
c := make(chan os.Signal, 1)
signal.Notify(c, os.Interrupt)
go func() {
for sig := range c {
// sig is a ^C, handle it
log.Printf("captured %v, cleaning up gpio and exiting..", sig)
gpio.CleanupGpio()
}
}()
stateChanged := make(chan PinState)
pinRemoved := make(chan string)
pinAdded := make(chan PinState)
go func() {
for {
// start listening on stateChanged and pinRemoved channels and update hub as appropriate
select {
case pinState := <-stateChanged:
go h.sendMsg("PinState", pinState)
case pinName := <-pinRemoved:
go h.sendMsg("PinRemoved", pinName)
case pinState := <-pinAdded:
go h.sendMsg("PinAdded", pinState)
}
}
}()
pinStates := make(map[string]PinState)
// read existing pin states
if _, err := os.Stat(STATE_FILE); err == nil {
log.Println("Reading prexisting pinstate file : " + STATE_FILE)
dat, err := ioutil.ReadFile(STATE_FILE)
if err != nil {
log.Println("Failed to read state file : " + STATE_FILE + " : " + err.Error())
return
}
err = json.Unmarshal(dat, &pinStates)
if err != nil {
log.Println("Failed to unmarshal json : " + err.Error())
return
}
}
gpio.Init(stateChanged, pinAdded, pinRemoved, pinStates)
}
func (g *GPIO) Init(pinStateChanged chan PinState, pinAdded chan PinState, pinRemoved chan string, states map[string]PinState) error {
g.pinStateChanged = pinStateChanged
g.pinRemoved = pinRemoved
g.pinAdded = pinAdded
g.pinStates = states
// now init pins
for key, pinState := range g.pinStates {
if pinState.Name == "" {
pinState.Name = pinState.PinId
}
g.PinInit(key, pinState.Dir, pinState.Pullup, pinState.Name)
g.PinSet(key, pinState.State)
}
return nil
}
func (g *GPIO) Close() error {
return nil
}
func (g *GPIO) PinMap() ([]PinDef, error) {
// return a mock pinmap for this mock interface
pinmap := []PinDef{
{
"P8_07",
[]string{"66", "GPIO_66", "TIMER4"},
[]string{"analog", "digital", "pwm"},
66,
0,
}, {
"P8_08",
[]string{"67", "GPIO_67", "TIMER7"},
[]string{"analog", "digital", "pwm"},
67,
0,
}, {
"P8_09",
[]string{"69", "GPIO_69", "TIMER5"},
[]string{"analog", "digital", "pwm"},
69,
0,
}, {
"P8_10",
[]string{"68", "GPIO_68", "TIMER6"},
[]string{"analog", "digital", "pwm"},
68,
0,
}, {
"P8_11",
[]string{"45", "GPIO_45"},
[]string{"analog", "digital", "pwm"},
45,
0,
},
}
return pinmap, nil
}
func (g *GPIO) Host() (string, error) {
return "fake", nil
}
func (g *GPIO) PinStates() (map[string]PinState, error) {
return g.pinStates, nil
}
func (g *GPIO) PinInit(pinId string, dir Direction, pullup PullUp, name string) error {
// add a pin
// look up internal ID (we're going to assume its correct already)
// make a pinstate object
pinState := PinState{
nil,
pinId,
dir,
0,
pullup,
name,
}
g.pinStates[pinId] = pinState
g.pinAdded <- pinState
return nil
}
func (g *GPIO) PinSet(pinId string, val byte) error {
// change pin state
if pin, ok := g.pinStates[pinId]; ok {
// we have a value....
pin.State = val
g.pinStates[pinId] = pin
// notify channel of new pinstate
g.pinStateChanged <- pin
}
return nil
}
func (g *GPIO) PinRemove(pinId string) error {
// remove a pin
if _, ok := g.pinStates[pinId]; ok {
// normally you would close the pin here
delete(g.pinStates, pinId)
g.pinRemoved <- pinId
}
return nil
}