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type_conversions16.go
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type_conversions16.go
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package modbus
import (
"encoding/binary"
"fmt"
)
type convert16 func([]byte) uint16
func endianessConverter16(byteOrder string) (convert16, error) {
switch byteOrder {
case "ABCD", "CDAB": // Big endian (Motorola)
return binary.BigEndian.Uint16, nil
case "DCBA", "BADC": // Little endian (Intel)
return binary.LittleEndian.Uint16, nil
}
return nil, fmt.Errorf("invalid byte-order: %s", byteOrder)
}
// I16 - no scale
func determineConverterI16(outType, byteOrder string) (fieldConverterFunc, error) {
tohost, err := endianessConverter16(byteOrder)
if err != nil {
return nil, err
}
switch outType {
case "native":
return func(b []byte) interface{} {
return int16(tohost(b))
}, nil
case "INT64":
return func(b []byte) interface{} {
return int64(int16(tohost(b)))
}, nil
case "UINT64":
return func(b []byte) interface{} {
return uint64(int16(tohost(b)))
}, nil
case "FLOAT64":
return func(b []byte) interface{} {
return float64(int16(tohost(b)))
}, nil
}
return nil, fmt.Errorf("invalid output data-type: %s", outType)
}
// U16 - no scale
func determineConverterU16(outType, byteOrder string) (fieldConverterFunc, error) {
tohost, err := endianessConverter16(byteOrder)
if err != nil {
return nil, err
}
switch outType {
case "native":
return func(b []byte) interface{} {
return tohost(b)
}, nil
case "INT64":
return func(b []byte) interface{} {
return int64(tohost(b))
}, nil
case "UINT64":
return func(b []byte) interface{} {
return uint64(tohost(b))
}, nil
case "FLOAT64":
return func(b []byte) interface{} {
return float64(tohost(b))
}, nil
}
return nil, fmt.Errorf("invalid output data-type: %s", outType)
}
// I16 - scale
func determineConverterI16Scale(outType, byteOrder string, scale float64) (fieldConverterFunc, error) {
tohost, err := endianessConverter16(byteOrder)
if err != nil {
return nil, err
}
switch outType {
case "native":
return func(b []byte) interface{} {
in := int16(tohost(b))
return int16(float64(in) * scale)
}, nil
case "INT64":
return func(b []byte) interface{} {
in := int16(tohost(b))
return int64(float64(in) * scale)
}, nil
case "UINT64":
return func(b []byte) interface{} {
in := int16(tohost(b))
return uint64(float64(in) * scale)
}, nil
case "FLOAT64":
return func(b []byte) interface{} {
in := int16(tohost(b))
return float64(in) * scale
}, nil
}
return nil, fmt.Errorf("invalid output data-type: %s", outType)
}
// U16 - scale
func determineConverterU16Scale(outType, byteOrder string, scale float64) (fieldConverterFunc, error) {
tohost, err := endianessConverter16(byteOrder)
if err != nil {
return nil, err
}
switch outType {
case "native":
return func(b []byte) interface{} {
in := tohost(b)
return uint16(float64(in) * scale)
}, nil
case "INT64":
return func(b []byte) interface{} {
in := tohost(b)
return int64(float64(in) * scale)
}, nil
case "UINT64":
return func(b []byte) interface{} {
in := tohost(b)
return uint64(float64(in) * scale)
}, nil
case "FLOAT64":
return func(b []byte) interface{} {
in := tohost(b)
return float64(in) * scale
}, nil
}
return nil, fmt.Errorf("invalid output data-type: %s", outType)
}