106 lines
1.7 KiB
Go
106 lines
1.7 KiB
Go
package ina3221
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import (
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"encoding/binary"
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"log"
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"periph.io/x/conn/v3/i2c"
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"periph.io/x/conn/v3/i2c/i2creg"
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"periph.io/x/conn/v3/mmr"
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"periph.io/x/host/v3"
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)
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type Channel uint8
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const (
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Channel_1 Channel = 1
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Channel_2 Channel = 3
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Channel_3 Channel = 5
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current_factor float64 = 40e-6
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voltage_factor float64 = 8e-3
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)
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var (
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logger log.Logger = *log.Default()
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mem_dev mmr.Dev8
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bus i2c.BusCloser
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i2c_dev i2c.Dev
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)
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func Start(slave_addr uint16) error {
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logger.SetPrefix("ina3112: ")
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logger.Println("Starting")
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var err error
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_, err = host.Init()
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if err != nil {
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logger.Println(err)
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}
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bus, err = i2creg.Open("")
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if err != nil {
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logger.Println(err)
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}
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i2c_dev = i2c.Dev{
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Bus: bus,
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Addr: slave_addr,
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}
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mem_dev = mmr.Dev8{
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Conn: &i2c_dev,
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Order: binary.BigEndian,
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}
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return err
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}
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func Stop() error {
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return bus.Close()
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}
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func Current(channel Channel) (float64, error) {
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res, err := shunt_voltage(channel)
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if err != nil {
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logger.Println(err)
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return 0.0, err
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}
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return res * current_factor, err
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}
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func Voltage(channel Channel) (float64, error) {
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res, err := bus_voltage(channel)
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if err != nil {
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logger.Println(err)
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return 0.0, err
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}
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return res * voltage_factor, err
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}
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func ManufacturerID() (uint16, error) {
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return read_register(0xfe)
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}
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func read_register(address uint8) (uint16, error) {
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return mem_dev.ReadUint16(address)
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}
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func shunt_voltage(channel Channel) (float64, error) {
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res, err := read_register(uint8(channel))
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if err != nil {
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logger.Println(err)
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return 0.0, err
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}
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res >>= 3
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return float64(res), err
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}
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func bus_voltage(channel Channel) (float64, error) {
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res, err := read_register(uint8(channel) + 1)
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if err != nil {
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logger.Println(err)
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return 0.0, err
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}
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res >>= 3
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return float64(res), err
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}
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