// Open opens a connection the the RGB backlight display.
// Once display is no longer in-use, it should be closed by Close.
func Open(o driver.Opener) (*Device, error) {
lcd, err := i2c.Open(o, lcdAddr)
if err != nil {
return nil, fmt.Errorf("cannot open LCD device: %v", err)
}
rgb, err := i2c.Open(o, rgbAddr)
if err != nil {
return nil, fmt.Errorf("cannot open RGB device: %v", err)
}
// two lines, regular 10 dots font.
if err := lcd.Write([]byte{lcdFn, functionSet | displayOn | line2 | dots10}); err != nil {
return nil, err
}
// direction: left to right
if err := lcd.Write([]byte{lcdFn, displayControl | displayOn}); err != nil {
return nil, err
}
// display on
if err := lcd.Write([]byte{lcdFn, entryModeSet | entryLeft | entryShiftDecrement}); err != nil {
return nil, err
}
return &Device{lcd: lcd, rgb: rgb}, nil
}
// Open opens a new PiGlow. A PiGlow must be closed if no longer in use.
// If the PiGlow has not been powered down since last use, it will be opened
// with its last programmed state.
func Open(o driver.Opener) (*PiGlow, error) {
conn, err := i2c.Open(o, addr)
if err != nil {
return nil, err
}
return &PiGlow{conn: conn}, nil
}
// Open opens a new RTC. An RTC must be closed when no longer used.
func Open(o driver.Opener) (*RTC, error) {
c, err := i2c.Open(o, addr)
if err != nil {
return nil, err
}
rtc := &RTC{conn: c}
if err := rtc.setup(); err != nil {
rtc.Close()
return nil, fmt.Errorf("cannot set up: %v", err)
}
return rtc, nil
}