Merge pull request #36 from imliubo/master

TTN frequency plan support China 470(uplink).

Author: brentru

adafruit_tinylora/adafruit_tinylora.py

@@ -166,6 +166,10 @@ def __init__(self, spi, cs, irq, rst, ttn_config, channel=None):
         elif ttn_config.country == "EU":
             from adafruit_tinylora.ttn_eu import TTN_FREQS
 
+            self._frequencies = TTN_FREQS
+        elif ttn_config.country == "CN":
+            from adafruit_tinylora.ttn_cn import TTN_FREQS
+
             self._frequencies = TTN_FREQS
         else:
             raise TypeError("Country Code Incorrect/Unsupported")

adafruit_tinylora/ttn_cn.py

@@ -0,0 +1,21 @@
+# SPDX-FileCopyrightText: 2018 Brent Rubell for Adafruit Industries
+# SPDX-FileCopyrightText: 2021 IAMLIUBO
+#
+# SPDX-License-Identifier: MIT
+
+"""
+`ttn_cn.py`
+======================================================
+The Things Network Frequency Plans - CN470
+* Author(s): IAMLIUBO
+"""
+TTN_FREQS = {
+    0: (0x79, 0x93, 0x33),  # 486.3 MHz
+    1: (0x79, 0xA0, 0x00),  # 486.5 MHz
+    2: (0x79, 0xAC, 0xCC),  # 486.7 MHz
+    3: (0x79, 0xB9, 0x99),  # 486.9 MHz
+    4: (0x79, 0xC6, 0x66),  # 487.1 MHz
+    5: (0x79, 0xD3, 0x33),  # 487.3 MHz
+    6: (0x79, 0xE0, 0x00),  # 487.5 MHz
+    7: (0x79, 0xEC, 0xCC),
+}  # 487.7 MHz