65 lines
1.6 KiB
Go
65 lines
1.6 KiB
Go
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package modbus
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import "fmt"
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const (
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maxQuantityDiscreteInput = uint16(2000)
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maxQuantityCoils = uint16(2000)
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maxQuantityInputRegisters = uint16(125)
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maxQuantityHoldingRegisters = uint16(125)
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)
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type configuration interface {
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check() error
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process() (map[byte]requestSet, error)
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sampleConfigPart() string
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}
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func removeDuplicates(elements []uint16) []uint16 {
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encountered := make(map[uint16]bool, len(elements))
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result := make([]uint16, 0, len(elements))
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for _, addr := range elements {
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if !encountered[addr] {
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encountered[addr] = true
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result = append(result, addr)
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}
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}
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return result
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}
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func normalizeInputDatatype(dataType string) (string, error) {
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switch dataType {
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case "BIT", "INT8L", "INT8H", "UINT8L", "UINT8H",
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"INT16", "UINT16", "INT32", "UINT32", "INT64", "UINT64",
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"FLOAT16", "FLOAT32", "FLOAT64", "STRING":
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return dataType, nil
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}
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return "unknown", fmt.Errorf("unknown input type %q", dataType)
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}
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func normalizeOutputDatatype(dataType string) (string, error) {
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switch dataType {
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case "", "native":
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return "native", nil
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case "INT64", "UINT64", "FLOAT64", "STRING":
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return dataType, nil
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}
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return "unknown", fmt.Errorf("unknown output type %q", dataType)
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}
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func normalizeByteOrder(byteOrder string) (string, error) {
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switch byteOrder {
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case "ABCD", "MSW-BE", "MSW": // Big endian (Motorola)
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return "ABCD", nil
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case "BADC", "MSW-LE": // Big endian with bytes swapped
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return "BADC", nil
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case "CDAB", "LSW-BE": // Little endian with bytes swapped
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return "CDAB", nil
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case "DCBA", "LSW-LE", "LSW": // Little endian (Intel)
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return "DCBA", nil
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}
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return "unknown", fmt.Errorf("unknown byte-order %q", byteOrder)
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}
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