Added TMC2209 support (#727)

TMC2209: Added TMC2209 support

tmc2209/motor_config.go

@@ -0,0 +1,37 @@
+package tmc2209
+
+func SetMicrostepsPerStep(microsteps uint16) uint8 {
+	exponent := uint8(0)
+	microstepsShifted := microsteps >> 1
+
+	for microstepsShifted > 0 {
+		microstepsShifted = microstepsShifted >> 1
+		exponent++
+	}
+
+	SetMicrostepsPerStepPowerOfTwo(exponent)
+	return exponent
+}
+
+func SetMicrostepsPerStepPowerOfTwo(exponent uint8) {
+	switch exponent {
+	case 0:
+		// Set MRES_001
+	case 1:
+		// Set MRES_002
+	case 2:
+		// Set MRES_004
+	case 3:
+		// Set MRES_008
+	case 4:
+		// Set MRES_016
+	case 5:
+		// Set MRES_032
+	case 6:
+		// Set MRES_064
+	case 7:
+		// Set MRES_128
+	default:
+		// Set MRES_256
+	}
+}