mcp23xxx

type Dev ¶

type Dev struct {
	sync.Mutex
	// contains filtered or unexported fields
}

Dev is a handle to an initialized MCP23xxx device.

It implements conn.Resource.

func New(opts *Opts) (*Dev, error)

func (d *Dev) Halt() error

func (d *Dev) String() string

type IFCfg ¶

type IFCfg func(*Dev) error

IFCfg represents a function to configure the communication interface.

func I2C(bus i2c.Bus) IFCfg

func SPI(port spi.Port, f physic.Frequency) IFCfg

type INTPinFunc ¶

type INTPinFunc int

INTPinFunc represents the configuration of INT pin. Refer to datasheet for possible modes.

const (
	// Active driver, active-low (default).
	INTActiveLow INTPinFunc = iota
	// Active driver, active-high.
	INTActiveHigh
	// Open-drain.
	INTOpenDrain
)

type Opts ¶

type Opts struct {
	// Chip model.
	Model string
	// Hardware address (refer to datasheet).
	HWAddr uint8
	// Interface configuration function.
	IFCfg
	// GPIO pin for capturing interrupts. If given, it must be already configured.
	IRQPin gpio.PinIn
	// INT pin configuration.
	INTPinFunc
}

Opts holds the configuration options for the device.