func main() { flag.Parse() if err := embd.InitI2C(); err != nil { panic(err) } defer embd.CloseI2C() bus := embd.NewI2CBus(1) controller, err := hd44780.NewI2C( bus, 0x20, hd44780.PCF8574PinMap, hd44780.RowAddress20Col, hd44780.TwoLine, hd44780.BlinkOn, ) if err != nil { panic(err) } display := characterdisplay.New(controller, 20, 4) defer display.Close() display.Clear() display.Message("Hello, world!\n@embd | characterdisplay") time.Sleep(10 * time.Second) display.BacklightOff() }
func main() { flag.Parse() if err := embd.InitI2C(); err != nil { panic(err) } defer embd.CloseI2C() bus := embd.NewI2CBus(1) hd, err := hd44780.NewI2C( bus, 0x20, hd44780.PCF8574PinMap, hd44780.RowAddress20Col, hd44780.TwoLine, hd44780.BlinkOn, ) if err != nil { panic(err) } defer hd.Close() hd.Clear() message := "Hello, world!" bytes := []byte(message) for _, b := range bytes { hd.WriteChar(b) } hd.SetCursor(0, 1) message = "@embd | hd44780" bytes = []byte(message) for _, b := range bytes { hd.WriteChar(b) } time.Sleep(10 * time.Second) hd.BacklightOff() }
// NewLcd create and init new lcd output func NewLcd() *Lcd { var l *Lcd defer func() { if e := recover(); e != nil { glog.Infof("NewLcd failed create - recover: %v", e) } }() l = &Lcd{ Lines: 2, Width: lcdWidth, lastLines: make([]string, 2, 2), } if configuration.DisplayConf.Display == "i2c" { l.addr = configuration.DisplayConf.I2CAddr glog.V(1).Infof("Starting hd44780 on i2c addr=%d", l.addr) if err := embd.InitI2C(); err != nil { glog.Error("Can't open lcd: ", err.Error()) return nil } bus := embd.NewI2CBus(1) var err error l.hd, err = hd44780.NewI2C( bus, l.addr, hd44780.PCF8574PinMap, hd44780.RowAddress16Col, hd44780.TwoLine, // hd44780.BlinkOff, hd44780.CursorOff, hd44780.EntryIncrement, ) if err != nil { glog.Fatal("Can't open i2c lcd: ", err.Error()) return nil } } else { glog.V(1).Infof("Starting hd44780 on GPIO") var err error l.hd, err = hd44780.NewGPIO( configuration.DisplayConf.GpioRs, configuration.DisplayConf.GpioEn, configuration.DisplayConf.GpioD4, configuration.DisplayConf.GpioD5, configuration.DisplayConf.GpioD6, configuration.DisplayConf.GpioD7, configuration.DisplayConf.GpioBl, hd44780.Positive, hd44780.RowAddress16Col, hd44780.TwoLine, // hd44780.BlinkOff, hd44780.CursorOff, hd44780.EntryIncrement, ) if err != nil { glog.Fatal("Can't open gpio lcd: ", err.Error()) return nil } } l.hd.Clear() l.hd.BacklightOn() l.backlight = true l.active = true // Custom characters // play l.setChar(0, []byte{0x0, 0x8, 0xc, 0xe, 0xc, 0x8, 0x0, 0x0}) // pause l.setChar(1, []byte{0x0, 0x1b, 0x1b, 0x1b, 0x1b, 0x1b, 0x0, 0x0}) // stop l.setChar(2, []byte{0x0, 0x1f, 0x1f, 0x1f, 0x1f, 0x1f, 0x0, 0x0}) return l }