Documentation
¶
Overview ¶
Package tca95xx provides an interface to the Texas Instruments TCA95 series of 8-bit I²C extenders.
The following variants are supported:
- PCA9536 - address: 0x41
- TCA6408A - addresses: 0x20, 0x21
- TCA6416 - addresses: 0x20, 0x21
- TCA6416A - addresses: 0x20, 0x21
- TCA9534 - addresses: 0x20, 0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27
- TCA9534A - addresses: 0x38, 0x39, 0x3a, 0x3b, 0x3c, 0x3d, 0x3e, 0x3f
- TCA9535 - addresses: 0x20, 0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27
- TCA9537 - address: 0x49
- TCA9538 - address: 0x70, 0x71, 0x72, 0x73
- TCA9539 - address: 0x74, 0x75, 0x76, 0x77
- TCA9554 - addresses: 0x20, 0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27
- TCA9555 - addresses: 0x20, 0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27
Both gpio.Pin and conn.Conn interfaces are supported.
Example ¶
// Make sure periph is initialized.
if _, err := host.Init(); err != nil {
log.Fatal(err)
}
// Open default I²C bus.
bus, err := i2creg.Open("")
if err != nil {
log.Fatalf("failed to open I²C: %v", err)
}
defer bus.Close()
// Create a new I2C IO extender
extender, err := tca95xx.New(bus, tca95xx.TCA9534, 0x20)
if err != nil {
log.Fatalln(err)
}
for _, port := range extender.Pins {
for _, pin := range port {
err = pin.In(gpio.Float, gpio.NoEdge)
if err != nil {
log.Fatalln(err)
}
level := pin.Read()
fmt.Printf("%s\t%s\n", pin.Name(), level.String())
}
}
if err != nil {
log.Fatalln(err)
}
Output:
Index ¶
Examples ¶
Constants ¶
This section is empty.
Variables ¶
This section is empty.
Functions ¶
This section is empty.
Types ¶
type Dev ¶
type Dev struct {
Pins [][]Pin // Pins is a double array structured as: [port][pin].
Conns []conn.Conn // Conns uses the same [port] array structure.
}
Dev is a TCA95xx series I²C extender with two ways to interact with the pins on the extender chip - as per pin gpio.Pin, or as per port conn.Conn connections.
type Pin ¶
type Pin interface {
gpio.PinIO
// SetPolarityInverted if set to true, GPIO register bit reflects the same logic state of the input pin.
SetPolarityInverted(p bool) error
// IsPolarityInverted returns true if the value of the input pin reflects inverted logic state.
IsPolarityInverted() (bool, error)
}
Pin extends gpio.PinIO interface with features supported by tca95xx devices.
type Variant ¶
type Variant string
Variant is the type denoting a specific variant of the family.
const ( PCA9536 Variant = "PCA9536" // PCA9536 8-bit I²C extender. Datasheet: https://www.ti.com/lit/gpn/pca9536 TCA6408A Variant = "TCA6408A" // TCA6408A 8-bit I²C extender. Datasheet: https://www.ti.com/lit/gpn/tca6408a TCA6416 Variant = "TCA6416" // TCA6416 8-bit I²C extender. Datasheet: https://www.ti.com/lit/gpn/tca6416 TCA6416A Variant = "TCA6416A" // TCA6416A 8-bit I²C extender. Datasheet: https://www.ti.com/lit/gpn/tca6416a TCA9534 Variant = "TCA9534" // TCA9534 8-bit I²C extender. Datasheet: https://www.ti.com/lit/gpn/tca9534 TCA9534A Variant = "TCA9534A" // TCA9534A 8-bit I²C extender. Datasheet: https://www.ti.com/lit/gpn/tca9534a TCA9535 Variant = "TCA9535" // TCA9535 8-bit I²C extender. Datasheet: https://www.ti.com/lit/gpn/tca9535 TCA9537 Variant = "TCA9537" // TCA9537 8-bit I²C extender. Datasheet: https://www.ti.com/lit/gpn/tca9537 TCA9538 Variant = "TCA9538" // TCA9538 8-bit I²C extender. Datasheet: https://www.ti.com/lit/gpn/tca9538 TCA9539 Variant = "TCA9539" // TCA9539 8-bit I²C extender. Datasheet: https://www.ti.com/lit/gpn/tca9539 TCA9554 Variant = "TCA9554" // TCA9554 8-bit I²C extender. Datasheet: https://www.ti.com/lit/gpn/tca9554 TCA9555 Variant = "TCA9555" // TCA9555 8-bit I²C extender. Datasheet: https://www.ti.com/lit/gpn/tca9555 )
Source Files
Click to show internal directories.
Click to hide internal directories.