126 lines
2.7 KiB
Go
126 lines
2.7 KiB
Go
package charger
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import (
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"errors"
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"time"
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"github.com/evcc-io/evcc/api"
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"github.com/evcc-io/evcc/util"
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"github.com/evcc-io/evcc/util/modbus"
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)
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// SimpleEVSE charger implementation
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type SimpleEVSE struct {
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log *util.Logger
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conn *modbus.Connection
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current int64
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}
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const (
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evseRegAmpsConfig = 1000
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evseRegVehicleStatus = 1002
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)
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func init() {
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registry.Add("simpleevse", NewSimpleEVSEFromConfig)
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}
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// https://files.ev-power.eu/inc/_doc/attach/StoItem/4418/evse-wb-din_Manual.pdf
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// NewSimpleEVSEFromConfig creates a SimpleEVSE charger from generic config
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func NewSimpleEVSEFromConfig(other map[string]interface{}) (api.Charger, error) {
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cc := modbus.Settings{
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Baudrate: 9600,
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Comset: "8N1",
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ID: 1,
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}
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if err := util.DecodeOther(other, &cc); err != nil {
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return nil, err
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}
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return NewSimpleEVSE(cc.URI, cc.Device, cc.Comset, cc.Baudrate, true, cc.ID)
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}
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// NewSimpleEVSE creates SimpleEVSE charger
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func NewSimpleEVSE(uri, device, comset string, baudrate int, rtu bool, slaveID uint8) (api.Charger, error) {
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log := util.NewLogger("evse")
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conn, err := modbus.NewConnection(uri, device, comset, baudrate, modbus.RtuFormat, slaveID)
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if err != nil {
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return nil, err
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}
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conn.Logger(log.TRACE)
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conn.Delay(200 * time.Millisecond)
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evse := &SimpleEVSE{
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log: log,
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conn: conn,
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current: 6, // assume min current
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}
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return evse, nil
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}
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// Status implements the api.Charger interface
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func (evse *SimpleEVSE) Status() (api.ChargeStatus, error) {
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b, err := evse.conn.ReadHoldingRegisters(evseRegVehicleStatus, 1)
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if err != nil {
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return api.StatusNone, err
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}
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switch b[1] {
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case 1: // ready
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return api.StatusA, nil
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case 2: // EV is present
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return api.StatusB, nil
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case 3: // charging
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return api.StatusC, nil
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case 4: // charging with ventilation
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return api.StatusD, nil
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case 5: // failure (e.g. diode check, RCD failure)
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return api.StatusE, nil
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default:
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return api.StatusNone, errors.New("invalid response")
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}
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}
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// Enabled implements the api.Charger interface
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func (evse *SimpleEVSE) Enabled() (bool, error) {
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b, err := evse.conn.ReadHoldingRegisters(evseRegAmpsConfig, 1)
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if err != nil {
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return false, err
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}
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enabled := b[1] != 0
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if enabled {
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evse.current = int64(b[1])
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}
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return enabled, nil
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}
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// Enable implements the api.Charger interface
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func (evse *SimpleEVSE) Enable(enable bool) error {
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b := []byte{0, 0}
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if enable {
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b[1] = byte(evse.current)
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}
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_, err := evse.conn.WriteMultipleRegisters(evseRegAmpsConfig, 1, b)
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return err
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}
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// MaxCurrent implements the api.Charger interface
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func (evse *SimpleEVSE) MaxCurrent(current int64) error {
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b := []byte{0, byte(current)}
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_, err := evse.conn.WriteMultipleRegisters(evseRegAmpsConfig, 1, b)
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if err == nil {
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evse.current = current
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}
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return err
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}
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