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
}