func connect(device string) (*connection.Connection, error) {
// Connect to the board
// s := &connection.Serial{DeviceName: device, BaudRate: syscall.B115200}
s := &connection.Serial{DeviceName: device, BaudRate: syscall.B9600}
conn, err := connection.New(s)
if err != nil {
return nil, err
}
defer func() {
conn.Disconnect()
}()
log.Printf("Establishing connection to device:\n%s\n", conn)
err = conn.Connect()
if err != nil {
// TODO: if no connection, keep trying periodically
return nil, err
}
log.Printf("Connected to device:\n%s\n", conn)
return conn, nil
}
func main() {
/*
// conn, err := connect("/dev/expresscarduino")
conn, err := connect("/dev/arduinoMetro328")
if err != nil {
panic(err) // TODO
}
toggleData(conn) // TODO: specify type of data to toggle
*/
// s := &connection.Serial{DeviceName: device, BaudRate: syscall.B115200}
// s := &connection.Serial{DeviceName: device, BaudRate: syscall.B9600}
s := &connection.Serial{DeviceName: "/dev/arduinoMetro328", BaudRate: syscall.B9600}
conn, err := connection.New(s)
if err != nil {
panic(err)
}
defer func() {
conn.Disconnect()
}()
log.Printf("Establishing connection to device:\n%s\n", conn)
err = conn.Connect()
if err != nil {
// TODO: if no connection, keep trying periodically
panic(err)
}
log.Printf("Connected to device:\n%s\n", conn)
// Toggle button data
_, err = conn.Write([]byte("B"))
if err != nil {
panic(err)
}
// TODO: Kick off a routine that just reads bytes
log.Printf("Reading stream...\n")
cmd := make([]byte, 1)
for conn.State == connection.Active {
n, err := conn.Read(cmd)
if err != nil {
log.Fatal(err)
}
if string(cmd[:n]) == "B" {
buf := make([]byte, 2)
n, err := conn.Read(buf)
log.Printf("Got %d bytes\n", n)
if err != nil {
log.Fatal(err)
}
if n != 2 {
log.Fatal("Did not read correct number of bytes!")
}
var val int16
binary.LittleEndian.PutUint16(buf, uint16(val)) // Arduino is little endian, like most uCs
log.Print("Button: %d", val)
}
// log.Printf("(%d) %q", n, buf[:n])
}
log.Printf("Ended connection to device:\n%s\n", conn)
// TODO: Attempt to reconnect
}