zephyr: lora: helper enums

Add helper enums for working with Zephyr LoRa configurations.

Signed-off-by: Jordan Yates <jordan@embeint.com>

Author: JordanYates

src/infuse_iot/zephyr/lora.py

@@ -0,0 +1,41 @@
+#!/usr/bin/env python3
+
+import enum
+
+
+class Bandwidth(enum.IntEnum):
+    """
+    LoRa Bandwidth
+    Higher bandwidths result in faster datarates but lower range
+    """
+
+    BW_125_KHZ = 0
+    BW_250_KHZ = 1
+    BW_500_KHZ = 2
+
+
+class SpreadingFactor(enum.IntEnum):
+    """
+    LoRa Spreading Factor
+    Higher spreading factors result in lower datarates but higher range
+    """
+
+    SF6 = 6
+    SF7 = 7
+    SF8 = 8
+    SF9 = 9
+    SF10 = 10
+    SF11 = 11
+    SF12 = 12
+
+
+class CodingRate(enum.IntEnum):
+    """
+    LoRa Coding Rate
+    Higher coding rates improve error recovery but increase packet overhead
+    """
+
+    CR_4_5 = 1
+    CR_4_6 = 2
+    CR_4_7 = 3
+    CR_4_8 = 4