Implemented new datasources (modbus,scpi)

2026-06-24 06:12:52 +02:00
parent 999a1510d4
commit cf9da3df0a
13 changed files with 1967 additions and 0 deletions
@@ -0,0 +1,115 @@
+package modbus
+
+import (
+	"math"
+	"testing"
+
+	"github.com/uopi/uopi/internal/datasource"
+)
+
+func TestDecodeEncodings(t *testing.T) {
+	cases := []struct {
+		name  string
+		reg   Register
+		words []uint16
+		want  any
+	}{
+		{"uint16", Register{Encoding: "uint16"}, []uint16{42}, int64(42)},
+		{"int16 neg", Register{Encoding: "int16"}, []uint16{0xFFFF}, int64(-1)},
+		{"uint32", Register{Encoding: "uint32"}, []uint16{0x0001, 0x0000}, int64(65536)},
+		{"int32 neg", Register{Encoding: "int32"}, []uint16{0xFFFF, 0xFFFF}, int64(-1)},
+		{"scaled", Register{Encoding: "int16", Scale: 0.1}, []uint16{235}, 23.5},
+		{"float32", Register{Encoding: "float32"}, f32Words(3.5), 3.5},
+		{"float64", Register{Encoding: "float64"}, f64Words(2.25), 2.25},
+	}
+	for _, tc := range cases {
+		got, err := tc.reg.decode(tc.words)
+		if err != nil {
+			t.Errorf("%s: decode error %v", tc.name, err)
+			continue
+		}
+		switch w := tc.want.(type) {
+		case int64:
+			if got != w {
+				t.Errorf("%s: got %v (%T), want %v", tc.name, got, got, w)
+			}
+		case float64:
+			gf, ok := got.(float64)
+			if !ok || math.Abs(gf-w) > 1e-6 {
+				t.Errorf("%s: got %v (%T), want %v", tc.name, got, got, w)
+			}
+		}
+	}
+}
+
+func TestWordOrder(t *testing.T) {
+	big := Register{Encoding: "uint32", WordOrder: "big"}
+	little := Register{Encoding: "uint32", WordOrder: "little"}
+	words := []uint16{0x0001, 0x0002} // big: 0x00010002, little reverses to 0x00020001
+	gb, _ := big.decode(words)
+	gl, _ := little.decode(words)
+	if gb != int64(0x00010002) {
+		t.Errorf("big = %v, want %d", gb, 0x00010002)
+	}
+	if gl != int64(0x00020001) {
+		t.Errorf("little = %v, want %d", gl, 0x00020001)
+	}
+}
+
+func TestEncodeRoundTrip(t *testing.T) {
+	for _, enc := range []string{"uint16", "int16", "uint32", "int32", "float32", "float64"} {
+		reg := Register{Encoding: enc}
+		words, err := reg.encode(123)
+		if err != nil {
+			t.Fatalf("%s encode: %v", enc, err)
+		}
+		got, err := reg.decode(words)
+		if err != nil {
+			t.Fatalf("%s decode: %v", enc, err)
+		}
+		var f float64
+		switch v := got.(type) {
+		case int64:
+			f = float64(v)
+		case float64:
+			f = v
+		}
+		if math.Abs(f-123) > 1e-3 {
+			t.Errorf("%s round-trip = %v, want 123", enc, f)
+		}
+	}
+}
+
+func TestDataTypeAndWritable(t *testing.T) {
+	if got := (Register{Kind: "coil"}).dataType(); got != datasource.TypeBool {
+		t.Errorf("coil type = %v, want bool", got)
+	}
+	if got := (Register{Encoding: "float32"}).dataType(); got != datasource.TypeFloat64 {
+		t.Errorf("float type = %v, want float64", got)
+	}
+	if got := (Register{Encoding: "uint16", Scale: 0.5}).dataType(); got != datasource.TypeFloat64 {
+		t.Errorf("scaled int type = %v, want float64", got)
+	}
+	if got := (Register{Encoding: "uint16"}).dataType(); got != datasource.TypeInt64 {
+		t.Errorf("plain int type = %v, want int64", got)
+	}
+	if (Register{Kind: "input", Writable: true}).writable() {
+		t.Error("input register must be read-only")
+	}
+	if (Register{Kind: "discrete", Writable: true}).writable() {
+		t.Error("discrete input must be read-only")
+	}
+	if !(Register{Kind: "holding", Writable: true}).writable() {
+		t.Error("writable holding should be writable")
+	}
+}
+
+func f32Words(v float32) []uint16 {
+	u := math.Float32bits(v)
+	return []uint16{uint16(u >> 16), uint16(u)}
+}
+
+func f64Words(v float64) []uint16 {
+	u := math.Float64bits(v)
+	return []uint16{uint16(u >> 48), uint16(u >> 32), uint16(u >> 16), uint16(u)}
+}