add tests for power management

sx127x/sx127x_test.go

@@ -0,0 +1,51 @@
+package sx127x
+
+import (
+	"math"
+	"testing"
+)
+
+func TestRFOPowReg(t *testing.T) {
+	for txPow := int8(-4); txPow < 17; txPow++ {
+		maxPow, outPow := rfoPowReg(txPow)
+		Pmax := 10.8 + 0.6*float64(maxPow)
+		Pout := Pmax - (15 - float64(outPow))
+		diff := math.Abs(Pout - float64(txPow))
+		if diff > .3 {
+			t.Errorf("wanted %d, got %f", txPow, Pout)
+		}
+	}
+}
+
+func TestPAPowReg(t *testing.T) {
+	for txPow := int8(2); txPow < 20; txPow++ {
+		outPow := paBoostPowReg(txPow)
+		Pout := 17.0 - (15 - float64(outPow))
+		diff := math.Abs(Pout - float64(txPow))
+		if diff > .01 {
+			t.Errorf("wanted %d, got %f", txPow, Pout)
+		}
+	}
+}
+
+func TestOCPTrim(t *testing.T) {
+	for imax := uint8(45); imax < 241; imax++ {
+		var gotImax float64
+		trim := ocpTrim(imax)
+		switch {
+		case trim <= 15:
+			gotImax = 45.0 + 5.0*float64(trim)
+		case trim <= 27:
+			gotImax = -30.0 + 10.0*float64(trim)
+		default:
+			gotImax = 240.0
+		}
+		if trim > 27 {
+			t.Error("trim > 27")
+		}
+		diff := math.Abs(gotImax - float64(imax))
+		if diff > 11 {
+			t.Errorf("wanted %d, got %f", imax, gotImax)
+		}
+	}
+}