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soypat
93 lines
2.3 KiB
Go
93 lines
2.3 KiB
Go
// Package adt7410 provides a driver for the adt7410 I2C Temperature Sensor.
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//
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// Datasheet: https://www.analog.com/media/en/technical-documentation/data-sheets/ADT7410.pdf
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package adt7410 // import "tinygo.org/x/drivers/adt7410"
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import (
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"time"
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"tinygo.org/x/drivers"
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"tinygo.org/x/drivers/internal/legacy"
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)
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type Error uint8
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const (
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ErrInvalidID Error = 0x1
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)
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func (e Error) Error() string {
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switch e {
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case ErrInvalidID:
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return "Invalid chip ID"
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default:
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return "Unknown error"
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}
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}
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type Device struct {
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bus drivers.I2C
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buf []byte
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Address uint8
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}
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// New returns ADT7410 device for the provided I2C bus using default address.
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// of 0x48 (1001000). To use multiple ADT7410 devices, the last 2 bits of the address
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// can be set using by connecting to the A1 and A0 pins to VDD or GND (for a
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// total of up to 4 devices on a I2C bus). Also note that 10k pullups are
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// recommended for the SDA and SCL lines.
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func New(i2c drivers.I2C) *Device {
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return &Device{
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bus: i2c,
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buf: make([]byte, 2),
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Address: Address,
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}
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}
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// Configure the ADT7410 device.
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func (d *Device) Configure() (err error) {
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// reset the chip
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d.writeByte(RegReset, 0xFF)
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time.Sleep(10 * time.Millisecond)
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return
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}
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// Connected returns whether sensor has been found.
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func (d *Device) Connected() bool {
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data := []byte{0}
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legacy.ReadRegister(d.bus, uint8(d.Address), RegID, data)
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return data[0]&0xF8 == 0xC8
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}
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// ReadTemperature returns the temperature in celsius milli degrees (°C/1000)
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func (d *Device) ReadTemperature() (temperature int32, err error) {
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return (int32(d.readUint16(RegTempValueMSB)) * 1000) / 128, nil
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}
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// ReadTempC returns the value in the temperature value register, in Celsius.
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func (d *Device) ReadTempC() float32 {
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t := d.readUint16(RegTempValueMSB)
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return float32(int(t)) / 128.0
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}
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// ReadTempF returns the value in the temperature value register, in Fahrenheit.
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func (d *Device) ReadTempF() float32 {
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return d.ReadTempC()*1.8 + 32.0
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}
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func (d *Device) writeByte(reg uint8, data byte) {
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d.buf[0] = reg
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d.buf[1] = data
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d.bus.Tx(uint16(d.Address), d.buf, nil)
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}
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func (d *Device) readByte(reg uint8) byte {
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legacy.ReadRegister(d.bus, d.Address, reg, d.buf)
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return d.buf[0]
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}
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func (d *Device) readUint16(reg uint8) uint16 {
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legacy.ReadRegister(d.bus, d.Address, reg, d.buf)
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return uint16(d.buf[0])<<8 | uint16(d.buf[1])
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}
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