concertina

pcf8575.go

 1package pcf8575
 2
 3import (
 4	"encoding/binary"
 5	"tinygo.org/x/drivers"
 6)
 7
 8type Device struct {
 9	Addr uint16
10	I2C  drivers.I2C
11}
12
13// Read value of all pins
14func (c *Device) Get() uint16 {
15	rxbuf := make([]byte, 2)
16	// If len(w) == 0, the low bit gets set
17	// see /usr/local/lib/tinygo/src/machine/machine_atsamd21.go
18	c.I2C.Tx(c.Addr, nil, rxbuf)
19	return binary.LittleEndian.Uint16(rxbuf)
20}
21
22// Put val onto all pins
23func (c *Device) Put(val uint16) {
24	txbuf := binary.LittleEndian.AppendUint16(nil, val)
25	rxbuf := []byte{}
26	c.I2C.Tx(c.Addr, txbuf, rxbuf)
27}