Add LED controls in ui/beepberry subpackage

go.mod

@@ -27,6 +27,8 @@ require (
 	maunium.net/go/mauflag v1.0.0
 	maunium.net/go/mautrix v0.11.1
 	mvdan.cc/xurls/v2 v2.4.0
+	periph.io/x/conn/v3 v3.7.0
+	periph.io/x/host/v3 v3.8.2
 )
 
 require (

go.sum

@@ -15,6 +15,7 @@ github.com/gorilla/mux v1.8.0 h1:i40aqfkR1h2SlN9hojwV5ZA91wcXFOvkdNIeFDP5koI=
 github.com/gorilla/mux v1.8.0/go.mod h1:DVbg23sWSpFRCP0SfiEN6jmj59UnW/n46BH5rLB71So=
 github.com/gorilla/websocket v1.5.0 h1:PPwGk2jz7EePpoHN/+ClbZu8SPxiqlu12wZP/3sWmnc=
 github.com/gorilla/websocket v1.5.0/go.mod h1:YR8l580nyteQvAITg2hZ9XVh4b55+EU/adAjf1fMHhE=
+github.com/jonboulle/clockwork v0.3.0 h1:9BSCMi8C+0qdApAp4auwX0RkLGUjs956h0EkuQymUhg=
 github.com/kr/pretty v0.1.0 h1:L/CwN0zerZDmRFUapSPitk6f+Q3+0za1rQkzVuMiMFI=
 github.com/kr/pretty v0.1.0/go.mod h1:dAy3ld7l9f0ibDNOQOHHMYYIIbhfbHSm3C4ZsoJORNo=
 github.com/kr/pty v1.1.1/go.mod h1:pFQYn66WHrOpPYNljwOMqo10TkYh1fy3cYio2l3bCsQ=
@@ -127,3 +128,7 @@ maunium.net/go/mautrix v0.11.1 h1:S5TZGY3M1/bJcd6Y5SUWsNvqQAgFjgFYk5ULm/NCkqk=
 maunium.net/go/mautrix v0.11.1/go.mod h1:K29EcHwsNg6r7fMfwvi0GHQ9o5wSjqB9+Q8RjCIQEjA=
 mvdan.cc/xurls/v2 v2.4.0 h1:tzxjVAj+wSBmDcF6zBB7/myTy3gX9xvi8Tyr28AuQgc=
 mvdan.cc/xurls/v2 v2.4.0/go.mod h1:+GEjq9uNjqs8LQfM9nVnM8rff0OQ5Iash5rzX+N1CSg=
+periph.io/x/conn/v3 v3.7.0 h1:f1EXLn4pkf7AEWwkol2gilCNZ0ElY+bxS4WE2PQXfrA=
+periph.io/x/conn/v3 v3.7.0/go.mod h1:ypY7UVxgDbP9PJGwFSVelRRagxyXYfttVh7hJZUHEhg=
+periph.io/x/host/v3 v3.8.2 h1:ayKUDzgUCN0g8+/xM9GTkWaOBhSLVcVHGTfjAOi8OsQ=
+periph.io/x/host/v3 v3.8.2/go.mod h1:yFL76AesNHR68PboofSWYaQTKmvPXsQH2Apvp/ls/K4=

ui/beepberry/led.go

@@ -0,0 +1,93 @@
+package beepberry
+
+import (
+	"periph.io/x/conn/v3/i2c"
+	"periph.io/x/conn/v3/i2c/i2creg"
+	"periph.io/x/host/v3"
+)
+
+const (
+	write = 0x80
+
+	power = 0x20
+	red   = 0x21
+	green = 0x22
+	blue  = 0x23
+)
+
+type LED struct {
+	bus  i2c.BusCloser
+	chip *i2c.Dev
+}
+
+func NewLED() (*LED, error) {
+	if _, err := host.Init(); err != nil {
+		return nil, err
+	}
+
+	i, err := i2creg.Open("1")
+	if err != nil {
+		return nil, err
+	}
+
+	return &LED{
+		bus:  i,
+		chip: &i2c.Dev{Addr: 0x1F, Bus: i},
+	}, nil
+}
+
+func (l *LED) Close() error {
+	return l.bus.Close()
+}
+
+func (l *LED) On() error {
+	_, err := l.chip.Write([]byte{power + write, 0x01})
+	return err
+}
+
+func (l *LED) Off() error {
+	_, err := l.chip.Write([]byte{power + write, 0x00})
+	return err
+}
+
+func (l *LED) SetColor(r, g, b uint16) error {
+	if _, err := l.chip.Write([]byte{red + write, byte(r)}); err != nil {
+		return err
+	}
+
+	if _, err := l.chip.Write([]byte{green + write, byte(g)}); err != nil {
+		return err
+	}
+
+	if _, err := l.chip.Write([]byte{blue + write, byte(b)}); err != nil {
+		return err
+	}
+
+	return nil
+}
+
+func (l *LED) IsOn() (bool, error) {
+	p := make([]byte, 1)
+	if err := l.chip.Tx([]byte{power}, p); err != nil {
+		return false, err
+	}
+
+	return p[0] > 0, nil
+}
+
+func (l *LED) Color() ([]byte, error) {
+	r := make([]byte, 1)
+	if err := l.chip.Tx([]byte{red}, r); err != nil {
+		return nil, err
+	}
+	g := make([]byte, 1)
+	if err := l.chip.Tx([]byte{green}, g); err != nil {
+		return nil, err
+	}
+	b := make([]byte, 1)
+	if err := l.chip.Tx([]byte{blue}, b); err != nil {
+		return nil, err
+	}
+
+	return []byte{r[0], g[0], b[0]}, nil
+}