Config for Dragino LoRa + GPS Board

The config was adjusted according to [1], to support the Dragino
LoRa + GPS Board on the Raspberry Pi 3.

[1] mayeranalytics#21

SX127x/LoRa.py

@@ -77,6 +77,8 @@ def wrapper(self, val):
 class LoRa(object):
 
     spi = BOARD.SpiDev()              # init and get the baord's SPI
+    spi.max_speed_hz = SPI_BAUD_RATE.MAX_SPEED_HZ
+    spi.mode = SPI_MODE.SPI_MODE
     mode = None                       # the mode is backed up here
     backup_registers = []
     verbose = True

SX127x/board_config.py

@@ -33,12 +33,12 @@ class BOARD:
         This is the Raspberry Pi board with one LED and a modtronix inAir9B.
     """
     # Note that the BCOM numbering for the GPIOs is used.
-    DIO0 = 22   # RaspPi GPIO 22
+    DIO0 = 4    # RaspPi GPIO 22
     DIO1 = 23   # RaspPi GPIO 23
     DIO2 = 24   # RaspPi GPIO 24
-    DIO3 = 25   # RaspPi GPIO 25
+    DIO3 = 21   # RaspPi GPIO 25
     LED  = 18   # RaspPi GPIO 18 connects to the LED on the proto shield
-    SWITCH = 4  # RaspPi GPIO 4 connects to a switch
+    SWITCH = 7  # RaspPi GPIO 4 connects to a switch
 
     # The spi object is kept here
     spi = None

SX127x/constants.py

@@ -188,3 +188,13 @@ class FSK:
         IMAGE_CAL          = 0x3B
         DIO_MAPPING_1      = 0x40
         DIO_MAPPING_2      = 0x41
+
+
+@add_lookup
+class SPI_BAUD_RATE:
+    MAX_SPEED_HZ = 5000
+
+
+@add_lookup
+class SPI_MODE:
+    SPI_MODE = 0b01