Initial commit for review

ina260/doc.go

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+// Copyright 2018 The Periph Authors. All rights reserved.
+// Use of this source code is governed under the Apache License, Version 2.0
+// that can be found in the LICENSE file.
+
+// Package ina219 controls a Texas Instruments ina260 current,
+// voltage and power monitor IC over an i2c bus.
+//
+// # Datasheet
+//
+// http://www.ti.com/lit/ds/symlink/ina260.pdf
+package ina260

ina260/example.go

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+package ina260_test
+
+import (
+	"fmt"
+	"log"
+
+	"periph.io/x/conn/v3/i2c/i2creg"
+	"periph.io/x/devices/v3/ina260"
+	"periph.io/x/host/v3"
+)
+
+func main() {
+	if _, err := host.Init(); err != nil {
+		fmt.Println(err)
+	}
+
+	busNumber := 0
+	bus, err := i2creg.Open(fmt.Sprintf("/dev/i2c-%d", busNumber))
+	if err != nil {
+		log.Fatal(err)
+	}
+	defer bus.Close()
+
+	// Fuel gauge
+	fuelGauge := ina260.New(bus)
+	if err != nil {
+		log.Fatal(err)
+	}
+	for {
+		f, err := fuelGauge.Read()
+		if err != nil {
+			log.Fatal(err)
+		}
+		log.Printf("%f V    %f A    %f W", f.Voltage, f.Current, f.Power)
+	}
+
+}

ina260/ina260.go

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+package ina260
+
+import (
+	"periph.io/x/conn/v3/i2c"
+)
+
+const (
+	INA260_CHIP_ID     uint8 = 0x40
+	INA260_CONFIG      uint8 = 0x00 // CONFIGURATION REGISTER (R/W)
+	INA260_CURRENT     uint8 = 0x01 // SHUNT VOLTAGE REGISTER (R)
+	INA260_BUSVOLTAGE  uint8 = 0x02 // BUS VOLTAGE REGISTER (R)
+	INA260_POWER       uint8 = 0x03 // POWER REGISTER (R)
+	INA260_MASK_ENABLE uint8 = 0x06 // MASK ENABLE REGISTER (R/W)
+	INA260_ALERT_LIMIT uint8 = 0x07 // ALERT LIMIT REGISTER (R/W)
+	INA260_MFG_UID     uint8 = 0xFE // MANUFACTURER UNIQUE ID REGISTER (R)
+	INA260_DIE_UID     uint8 = 0xFF // DIE UNIQUE ID REGISTER (R)
+
+)
+
+type Power struct {
+	Current float64
+	Voltage float64
+	Power   float64
+}
+
+type ina260 struct {
+	Conn  *i2c.Dev
+	Power Power
+}
+
+func New(bus i2c.Bus) *ina260 {
+
+	dev := &i2c.Dev{Bus: bus, Addr: uint16(INA260_CHIP_ID)}
+	power := Power{
+		Current: 0,
+		Voltage: 0,
+		Power:   0,
+	}
+
+	ina260 := &ina260{
+		Conn:  dev,
+		Power: power,
+	}
+
+	return ina260
+}
+
+func (i *ina260) Read() (Power, error) {
+
+	var power Power
+
+	reg := []byte{byte(INA260_CURRENT)}
+	currentBytes := make([]byte, 2)
+	if err := i.Conn.Tx(reg, currentBytes); err != nil {
+		return power, err
+	}
+
+	reg = []byte{byte(INA260_BUSVOLTAGE)}
+	voltageBytes := make([]byte, 2)
+	if err := i.Conn.Tx(reg, voltageBytes); err != nil {
+		return power, err
+	}
+
+	reg = []byte{byte(INA260_POWER)}
+	powerBytes := make([]byte, 2)
+	if err := i.Conn.Tx(reg, powerBytes); err != nil {
+		return power, err
+	}
+
+	amps := uint16(currentBytes[0])<<8 + uint16(currentBytes[1])
+	volts := uint16(voltageBytes[0])<<8 + uint16(voltageBytes[1])
+	watts := uint16(powerBytes[0])<<8 + uint16(powerBytes[1])
+
+	power.Voltage = 0.00125 * float64(volts)
+	power.Current = 0.00125 * float64(amps)
+	power.Power = 0.01 * float64(watts) // 10mW/bit
+
+	return power, nil
+}
+
+func ManufacturerId(d *i2c.Dev) (uint16, error) {
+	reg := []byte{byte(INA260_MFG_UID)}
+	manufacturerBytes := make([]byte, 2)
+	if err := d.Tx(reg, manufacturerBytes); err != nil {
+		return 0, err
+	}
+	manufacturerID := uint16(manufacturerBytes[0])<<8 + uint16(manufacturerBytes[1])
+	return manufacturerID, nil
+}
+
+func DieId(d *i2c.Dev) (uint16, error) {
+	reg := []byte{byte(INA260_DIE_UID)}
+	dieBytes := make([]byte, 2)
+	if err := d.Tx(reg, dieBytes); err != nil {
+		return 0, err
+	}
+	dieID := uint16(dieBytes[0])<<8 + uint16(dieBytes[1])
+	return dieID, nil
+}