Documentation
¶
Index ¶
- type Config
- type Controller
- type Expander
- type ExpanderConfig
- type Font
- type HD44780
- func (lcd *HD44780) Clear() error
- func (lcd *HD44780) Home() error
- func (lcd *HD44780) SetBacklight(v bool) error
- func (lcd *HD44780) SetCursorXY(x, y int) error
- func (lcd *HD44780) SetDisplay(displayOn, cursorOn, cursorBlink bool) error
- func (lcd *HD44780) SetEntryMode(increment, shiftDisplay bool) error
- func (lcd *HD44780) SetFunction(eightBitMode, twoLines, fiveByTen bool) error
- func (lcd *HD44780) Write(p []byte) (int, error)
- func (lcd *HD44780) WriteByte(b byte) error
Constants ¶
This section is empty.
Variables ¶
This section is empty.
Functions ¶
This section is empty.
Types ¶
type Controller ¶
type Controller interface {
// IsEightBitMode should return true if the controller supports 8-bit communication.
IsEightBitMode() bool
// SetBacklight should update the state of the backlight.
SetBacklight(bool) error
// WriteByteIR writes to the instruction register.
WriteByteIR(byte) error
// ReadByteIR reads from the instruction register.
ReadByteIR() (byte, error)
// WriteByte writes to the data register.
io.ByteWriter
// ReadByte reads from the data register.
io.ByteReader
}
The Controller interface is the main interface for interacting with a LCD display.
type Expander ¶
type Expander struct {
ExpanderConfig
// contains filtered or unexported fields
}
func NewExpander ¶
func NewExpander(cfg ExpanderConfig) *Expander
func (*Expander) IsEightBitMode ¶
func (*Expander) ReadByteIR ¶
func (*Expander) SetBacklight ¶
func (*Expander) WriteByteIR ¶
type ExpanderConfig ¶
type ExpanderConfig struct {
RS driver.OutputPin
RW driver.OutputPin
E driver.OutputPin
BL driver.OutputPin
// Read operations will only be enabled if the DB_ pins also implement
// the ioexp.InputPin interface.
DB4 driver.OutputPin
DB5 driver.OutputPin
DB6 driver.OutputPin
DB7 driver.OutputPin
// optional
DB0 driver.OutputPin
DB1 driver.OutputPin
DB2 driver.OutputPin
DB3 driver.OutputPin
// Flush, if set, will be called after updating pins for writing.
Flush func() error
// Refresh, if set, will be called before reading pins.
Refresh func() error
}
type HD44780 ¶
type HD44780 struct {
// contains filtered or unexported fields
}
func NewHD44780 ¶
func NewHD44780(c Controller, cfg Config) (*HD44780, error)
func (*HD44780) Clear ¶
Clear clears the entire display and sets DDRAM address 0 in the address counter.
func (*HD44780) Home ¶
Home sets DDRAM address 0 in the address counter and returns the cursor to the home position.
func (*HD44780) SetBacklight ¶
func (*HD44780) SetCursorXY ¶
SetCursorXY sets the cursor position to the specified coordinates starting from top-left.
func (*HD44780) SetDisplay ¶
func (*HD44780) SetEntryMode ¶
func (*HD44780) SetFunction ¶
SetFunction sets the number of display lines, character font, and data transmission length.
If eightBitMode is false, 4-bit communication will be used. If twoLines is false, only one line will be displayed. If fiveByTen is false, the character font will be 5x8.
Source Files
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