This repository has been archived by the owner on Feb 18, 2024. It is now read-only.
Can not open input device on Raspberry Pi 3B+ anymore #15
Comments
|
Hi, can you give a try to : https://github.com/MaitreDede/golang-evdev/tree/err-checks ? |
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@maitredede Yes, your fork/branch seems to work as it should. Got my RPi accessible via: https://6ea712a77b3b247831fcc102c606a54a.balena-devices.com/ Currently running codepackage main
import (
"context"
"encoding/json"
"flag"
"fmt"
"image/png"
"io/ioutil"
"log"
"net/http"
"os"
"os/signal"
"time"
evdev "github.com/MaitreDede/golang-evdev"
ble "github.com/go-ble/ble"
dev "github.com/go-ble/ble/examples/lib/dev"
screen "github.com/nathany/bobblehat/sense/screen"
color "github.com/nathany/bobblehat/sense/screen/color"
ruuvitag "github.com/peterhellberg/ruuvitag"
)
var (
rawData = map[string]timestampedRAWv1{}
framebuffer = screen.NewFrameBuffer()
)
type timestampedRAWv1 struct {
ruuvitag.RAWv1
Time time.Time
}
func clear() {
framebuffer = screen.NewFrameBuffer()
// Clear the Sense HAT screen
screen.Clear()
}
func main() {
var path string
flag.StringVar(&path, "path", "/dev/input/event0", "path to the event device")
flag.Parse()
clear()
// Setup the logger
logger := log.New(os.Stdout, "", 0)
handleSignals(logger)
hs := setup(logger)
device, err := openInputDevice(path)
if err != nil {
logger.Printf("Unable to open input device: %s\nError: %v\n", path, err)
os.Exit(1)
}
logger.Println(device)
go hs.ListenAndServe()
go bleScan(context.Background(), logger)
for {
events, err := device.Read()
if err != nil {
fmt.Printf("device.Read() Error: %v\n", err)
os.Exit(1)
}
for _, ev := range events {
switch ev.Type {
case evdev.EV_KEY:
ke := evdev.NewKeyEvent(&ev)
if ke.State != evdev.KeyDown {
continue
}
// Create a new framebuffer
fb := screen.NewFrameBuffer()
switch ke.Scancode {
case evdev.KEY_ENTER:
fmt.Println("⏎ ")
case evdev.KEY_UP:
fmt.Println("↑")
draw(fb, 0, 0, 8, 4, color.New(255, 255, 0))
case evdev.KEY_DOWN:
fmt.Println("↓")
draw(fb, 0, 4, 8, 8, color.New(255, 0, 0))
case evdev.KEY_LEFT:
fmt.Println("←")
draw(fb, 0, 0, 4, 8, color.New(0, 0, 255))
case evdev.KEY_RIGHT:
fmt.Println("→")
draw(fb, 4, 0, 8, 8, color.New(0, 255, 0))
}
framebuffer = fb
screen.Draw(fb)
}
}
}
}
func openInputDevice(path string) (*evdev.InputDevice, error) {
if !evdev.IsInputDevice(path) {
return nil, fmt.Errorf("not an input device")
}
return evdev.Open(path)
}
func handleSignals(logger *log.Logger) {
c := make(chan os.Signal, 1)
signal.Notify(c, os.Interrupt)
go func() {
for range c {
logger.Println("Clearing the screen...")
clear()
os.Exit(0)
}
}()
}
func bleScan(ctx context.Context, logger *log.Logger) {
d, err := dev.DefaultDevice()
if err != nil {
logger.Printf("DefaultDevice error: %v\n", err)
return
}
ble.SetDefaultDevice(d)
handler := func(a ble.Advertisement) {
raw, err := ruuvitag.ParseRAWv1(a.ManufacturerData())
if err == nil {
rawData[a.Addr().String()] = timestampedRAWv1{raw, time.Now()}
}
}
ctx = ble.WithSigHandler(context.WithCancel(ctx))
ble.Scan(ctx, true, handler, func(a ble.Advertisement) bool {
return ruuvitag.IsRAWv1(a.ManufacturerData())
})
}
func draw(fb *screen.FrameBuffer, a, b, m, n int, c color.Color) {
for i := a; i < m; i++ {
for j := b; j < n; j++ {
fb.SetPixel(i, j, c)
}
}
}
func setup(logger *log.Logger) *http.Server {
return &http.Server{
Addr: getAddr(),
Handler: newServer(logWith(logger)),
ReadTimeout: 5 * time.Second,
WriteTimeout: 10 * time.Second,
IdleTimeout: 60 * time.Second,
}
}
func getAddr() string {
if port := os.Getenv("PORT"); port != "" {
return ":" + port
}
return ":80"
}
func newServer(options ...Option) *Server {
s := &Server{logger: log.New(ioutil.Discard, "", 0)}
for _, o := range options {
o(s)
}
s.mux = http.NewServeMux()
s.mux.HandleFunc("/", s.index)
s.mux.HandleFunc("/framebuffer.png", s.framebuffer)
s.mux.HandleFunc("/favicon.ico", s.favicon)
return s
}
type Option func(*Server)
func logWith(logger *log.Logger) Option {
return func(s *Server) {
s.logger = logger
}
}
type Server struct {
mux *http.ServeMux
logger *log.Logger
}
func (s *Server) ServeHTTP(w http.ResponseWriter, r *http.Request) {
if r.Method != "GET" {
w.WriteHeader(http.StatusMethodNotAllowed)
return
}
s.log("%s %s", r.Method, r.URL.Path)
s.mux.ServeHTTP(w, r)
}
func (s *Server) log(format string, v ...interface{}) {
s.logger.Printf(format+"\n", v...)
}
func (s *Server) index(w http.ResponseWriter, r *http.Request) {
w.Header().Set("Content-Type", "application/json; charset=utf-8")
json.NewEncoder(w).Encode(map[string]interface{}{
"ruuvitags": rawData,
})
}
func (s *Server) framebuffer(w http.ResponseWriter, r *http.Request) {
if framebuffer == nil {
w.WriteHeader(http.StatusNoContent)
return
}
png.Encode(w, framebuffer)
}
func (s *Server) favicon(w http.ResponseWriter, r *http.Request) {
w.Write(faviconData)
}
var faviconData = []byte{
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} |
|
@gvalkov Should I close this issue, or do you want to incorporate the changes made in https://github.com/MaitreDede/golang-evdev/tree/err-checks? |
|
Hi, I made a pull request : #17 |
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After b6f418b there was some change that broke the usage of
golang-evdevon my Raspberry Pi 3B+ running balenaOS. (With resin/scratch containers built with balenalib/raspberrypi3-alpine-golang)In the latest version of this package the input device list is empty
(
[]*evdev.InputDevice{}) and/dev/input/event0doesn’t exist.For now my workaround is to lock the version of this package to b6f418b but just wanted to give you a heads up.
(I’m using this package in combination with https://github.com/nathany/bobblehat on a RPi connected to a SenseHAT)
The text was updated successfully, but these errors were encountered: