Implemented new datasources (modbus,scpi)

internal/datasource/scpi/config.go

@@ -0,0 +1,75 @@
+package scpi
+
+import "github.com/uopi/uopi/internal/datasource"
+
+// Config is the [datasource.scpi] section. Each instrument is polled
+// independently over its own TCP socket.
+type Config struct {
+	Enabled bool `toml:"enabled"`
+	// PollIntervalMs is the default polling period for channels that do not
+	// override it. Zero → 1000 ms.
+	PollIntervalMs int          `toml:"poll_interval_ms"`
+	Instruments    []Instrument `toml:"instruments"`
+}
+
+// Instrument is one SCPI device reachable over a raw TCP socket. Address is
+// "host:port"; the conventional SCPI-raw port 5025 is appended if absent.
+type Instrument struct {
+	Name string `toml:"name"`
+	// Transport selects the link type. "raw" (default) is line-based SCPI over
+	// TCP. Reserved: "vxi11" (not yet implemented).
+	Transport string `toml:"transport"`
+	Address   string `toml:"address"`
+	TimeoutMs int    `toml:"timeout_ms"`
+	// Terminator is appended to every command. Empty → "\n".
+	Terminator string    `toml:"terminator"`
+	Channels   []Channel `toml:"channels"`
+}
+
+// Channel maps a SCPI query/command pair onto a signal named
+// "instrument:channel".
+type Channel struct {
+	Name string `toml:"name"`
+	// Query is the SCPI command whose response is the channel value,
+	// e.g. "MEAS:VOLT?". Required.
+	Query string `toml:"query"`
+	// WriteCmd is a printf-style template used by Write; "%v" is replaced with
+	// the value, e.g. "VOLT %v". Empty → channel is read-only.
+	WriteCmd string `toml:"write_cmd"`
+	// Type is the value type: "float" (default), "string", "int", or "bool".
+	Type           string  `toml:"type"`
+	Unit           string  `toml:"unit"`
+	Min            float64 `toml:"min"`
+	Max            float64 `toml:"max"`
+	PollIntervalMs int     `toml:"poll_interval_ms"`
+	Description    string  `toml:"description"`
+}
+
+func (c Channel) dataType() datasource.DataType {
+	switch c.Type {
+	case "string":
+		return datasource.TypeString
+	case "int":
+		return datasource.TypeInt64
+	case "bool":
+		return datasource.TypeBool
+	default:
+		return datasource.TypeFloat64
+	}
+}
+
+func (c Channel) writable() bool { return c.WriteCmd != "" }
+
+func (c Channel) metadata(instrument string) datasource.Metadata {
+	return datasource.Metadata{
+		Name:        instrument + ":" + c.Name,
+		Type:        c.dataType(),
+		Unit:        c.Unit,
+		Description: c.Description,
+		DisplayLow:  c.Min,
+		DisplayHigh: c.Max,
+		DriveLow:    c.Min,
+		DriveHigh:   c.Max,
+		Writable:    c.writable(),
+	}
+}