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package main
import (
"encoding/hex"
"flag"
"image"
"log"
"os"
"time"
"pm3.dev/cvend"
"pm3.dev/fb"
)
type cvendState struct {
ready bool
hasCard bool
}
type displayState struct {
now time.Time
cvend cvendState
}
func main() {
flag.Parse()
log.SetFlags(log.Lshortfile | log.Ldate | log.Ltime | log.Lmicroseconds)
log.Println(os.Args[0], "start")
displayStateCh := make(chan displayState)
go displayTask(displayStateCh)
displayState := displayState{
now: time.Now(),
}
displayStateCh <- displayState
cvendStateCh := make(chan cvendState)
go cvendTask(cvendStateCh)
tickerCh := wallTicker(time.Minute).C
for {
select {
case now := <-tickerCh:
displayState.now = now
case cvendState := <-cvendStateCh:
displayState.cvend = cvendState
}
displayStateCh <- displayState
}
}
// wallTicker returns a ticker that fires whenever time.Now().Truncate(d) changes
func wallTicker(d time.Duration) *time.Ticker {
first := time.Until(time.Now().Add(d).Truncate(d))
ticker := time.NewTicker(first)
go func() {
time.Sleep(first)
ticker.Reset(d)
}()
return ticker
}
func displayTask(in <-chan displayState) {
fb, err := fb.Open()
if err != nil {
log.Fatalf("open fb: %v", err)
}
defer fb.Close()
for state := range in {
start := time.Now()
img := image.NewRGBA(fb.Bounds())
drawDisplay(img, state)
fb.WriteRGBA(img)
dur := time.Now().Sub(start)
log.Printf("display update %s %+v", dur, state)
}
}
func cvendTask(out chan<- cvendState) {
var state cvendState
cv, err := cvend.Open()
if err != nil {
log.Fatalf("cvend Open: %s", err)
}
status, err := cv.AwaitStatus()
if err != nil {
log.Fatalf("cvend AwaitStatus: %s", err)
}
log.Printf("cvend status: %q", string(status))
reply, err := cv.ProxCardFunction(7, true)
if err != nil {
log.Fatalf("cvend ProxCardFunction: %s", err)
}
log.Printf("enabled DESFire %s", hex.EncodeToString(reply))
state.ready = true
out <- state
go func() { // send periodic status requests to keep cvend from going to sleep
for {
time.Sleep(30 * time.Second)
if err := cv.SendIPP(0x04, 0, nil); err != nil {
log.Printf("failed to send Status: %s", err)
}
}
}()
for {
cardRaw, err := cv.AwaitCard()
if err != nil {
log.Println("error awaiting card: %s", err)
continue
}
card := cardRaw.(*cvend.DESFireCard) // todo other types
log.Println("got card %+v", card)
state.hasCard = true
out <- state
card.AwaitRemoved()
log.Println("card removed")
state.hasCard = false
out <- state
}
}
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