set LowDataRateOptimize if symbol time > 16ms.

codes/controller/controller.py

@@ -29,13 +29,13 @@ def __init__(self,
                  pin_id_led = ON_BOARD_LED_PIN_NO, 
                  on_board_led_high_is_on = ON_BOARD_LED_HIGH_IS_ON,
                  pin_id_reset = PIN_ID_FOR_LORA_RESET, 
-                 blink_on_start = (2, 0.5, 0.5)):
-                 
+                 blink_on_start = (2, 0.5, 0.5)):                 
+
         self.pin_led = self.prepare_pin(pin_id_led)
         self.on_board_led_high_is_on = on_board_led_high_is_on
-        self.pin_reset = self.prepare_pin(pin_id_reset)
-        self.spi = self.prepare_spi(self.get_spi())
+        self.pin_reset = self.prepare_pin(pin_id_reset)        
         self.reset_pin(self.pin_reset)
+        self.spi = self.prepare_spi(self.get_spi())        
         self.transceivers = {}
         self.blink_led(*blink_on_start) 
 

codes/demo/LoRaDuplex.py

@@ -40,9 +40,9 @@ def sendMessage(lora, outgoing):
 def receive(lora):
     if lora.receivedPacket():    
         lora.blink_led() 
-        payload = lora.read_payload()
 
-        try:
+        try:	
+			payload = lora.read_payload()
             print("*** Received message ***\n{}".format(payload.decode()))
         except Exception as e:
             print(e)

codes/demo/LoRaReceiver.py

@@ -4,9 +4,9 @@ def receive(lora):
     while True:        
         if lora.receivedPacket():            
             lora.blink_led()
-            payload = lora.read_payload()
 
             try:
+				payload = lora.read_payload()
                 print("*** Received message ***\n{}".format(payload.decode()))
             except Exception as e:
                 print(e)

codes/demo/LoRaSetSpread.py

@@ -43,9 +43,9 @@ def sendMessage(lora, outgoing):
 def receive(lora):
     if lora.receivedPacket(): 
         lora.blink_led() 
-        payload = lora.read_payload()
 
         try:
+			payload = lora.read_payload()
             print("*** Received message ***\n{}".format(payload.decode()))
         except Exception as e:
             print(e)

codes/display/display_ssd1306_i2c.py

@@ -1,5 +1,5 @@
 # https://learn.adafruit.com/micropython-hardware-ssd1306-oled-display/software
-
+import time
 import machine 
 import ssd1306
 

codes/sx127x/sx127x.py

@@ -102,7 +102,7 @@ def init(self, parameters = None):
 
 
         # config
-        self.setFrequency(self.parameters['frequency'])
+        self.setFrequency(self.parameters['frequency']) 
         self.setSignalBandwidth(self.parameters['signal_bandwidth'])
 
         # set LNA boost
@@ -113,13 +113,17 @@ def init(self, parameters = None):
 
         self.setTxPower(self.parameters['tx_power_level'])
         self._implicitHeaderMode = None
-        self.implicitHeaderMode(self.parameters['implicitHeader'])      
+        self.implicitHeaderMode(self.parameters['implicitHeader'])
         self.setSpreadingFactor(self.parameters['spreading_factor'])
         self.setCodingRate(self.parameters['coding_rate'])
         self.setPreambleLength(self.parameters['preamble_length'])
         self.setSyncWord(self.parameters['sync_word'])
         self.enableCRC(self.parameters['enable_CRC'])
 
+        # set LowDataRateOptimize flag if symbol time > 16ms (default disable on reset)
+        if 1000 / (self.parameters['signal_bandwidth'] / 2**self.parameters['spreading_factor']) > 16:
+            self.writeRegister(REG_MODEM_CONFIG_3, 0x04 | 0x08)
+
         # set base addresses
         self.writeRegister(REG_FIFO_TX_BASE_ADDR, FifoTxBaseAddr)
         self.writeRegister(REG_FIFO_RX_BASE_ADDR, FifoRxBaseAddr)
@@ -243,12 +247,14 @@ def setSpreadingFactor(self, sf):
 
     def setSignalBandwidth(self, sbw):        
         bins = (7.8E3, 10.4E3, 15.6E3, 20.8E3, 31.25E3, 41.7E3, 62.5E3, 125E3, 250E3)
-        
+
         bw = 9        
         for i in range(len(bins)):
             if sbw <= bins[i]:
                 bw = i
                 break
+
+        # bw = bins.index(sbw)
 
         self.writeRegister(REG_MODEM_CONFIG_1, (self.readRegister(REG_MODEM_CONFIG_1) & 0x0f) | (bw << 4))
 
@@ -281,9 +287,9 @@ def setSyncWord(self, sw):
             # self.writeRegister(REG_IRQ_FLAGS_MASK, self.readRegister(REG_IRQ_FLAGS_MASK) | IRQ_RX_DONE_MASK)
 
 
-    def dumpRegisters(self):
-        for i in range(128):
-            print("0x{0:02x}: {1:02x}".format(i, self.readRegister(i)))
+    # def dumpRegisters(self):
+        # for i in range(128):
+            # print("0x{0:02x}: {1:02x}".format(i, self.readRegister(i)))
 
 
     def implicitHeaderMode(self, implicitHeaderMode = False):

examples/DuplexCallback/controller.py

@@ -29,13 +29,13 @@ def __init__(self,
                  pin_id_led = ON_BOARD_LED_PIN_NO, 
                  on_board_led_high_is_on = ON_BOARD_LED_HIGH_IS_ON,
                  pin_id_reset = PIN_ID_FOR_LORA_RESET, 
-                 blink_on_start = (2, 0.5, 0.5)):
-                 
+                 blink_on_start = (2, 0.5, 0.5)):                 
+
         self.pin_led = self.prepare_pin(pin_id_led)
         self.on_board_led_high_is_on = on_board_led_high_is_on
-        self.pin_reset = self.prepare_pin(pin_id_reset)
-        self.spi = self.prepare_spi(self.get_spi())
+        self.pin_reset = self.prepare_pin(pin_id_reset)        
         self.reset_pin(self.pin_reset)
+        self.spi = self.prepare_spi(self.get_spi())        
         self.transceivers = {}
         self.blink_led(*blink_on_start) 
 

examples/DuplexCallback/display_ssd1306_i2c.py

@@ -1,5 +1,5 @@
 # https://learn.adafruit.com/micropython-hardware-ssd1306-oled-display/software
-
+import time
 import machine 
 import ssd1306
 

examples/DuplexCallback/sx127x.py

@@ -102,7 +102,7 @@ def init(self, parameters = None):
 
 
         # config
-        self.setFrequency(self.parameters['frequency'])
+        self.setFrequency(self.parameters['frequency']) 
         self.setSignalBandwidth(self.parameters['signal_bandwidth'])
 
         # set LNA boost
@@ -113,13 +113,17 @@ def init(self, parameters = None):
 
         self.setTxPower(self.parameters['tx_power_level'])
         self._implicitHeaderMode = None
-        self.implicitHeaderMode(self.parameters['implicitHeader'])      
+        self.implicitHeaderMode(self.parameters['implicitHeader'])
         self.setSpreadingFactor(self.parameters['spreading_factor'])
         self.setCodingRate(self.parameters['coding_rate'])
         self.setPreambleLength(self.parameters['preamble_length'])
         self.setSyncWord(self.parameters['sync_word'])
         self.enableCRC(self.parameters['enable_CRC'])
 
+        # set LowDataRateOptimize flag if symbol time > 16ms (default disable on reset)
+        if 1000 / (self.parameters['signal_bandwidth'] / 2**self.parameters['spreading_factor']) > 16:
+            self.writeRegister(REG_MODEM_CONFIG_3, 0x04 | 0x08)
+
         # set base addresses
         self.writeRegister(REG_FIFO_TX_BASE_ADDR, FifoTxBaseAddr)
         self.writeRegister(REG_FIFO_RX_BASE_ADDR, FifoRxBaseAddr)
@@ -243,12 +247,14 @@ def setSpreadingFactor(self, sf):
 
     def setSignalBandwidth(self, sbw):        
         bins = (7.8E3, 10.4E3, 15.6E3, 20.8E3, 31.25E3, 41.7E3, 62.5E3, 125E3, 250E3)
-        
+
         bw = 9        
         for i in range(len(bins)):
             if sbw <= bins[i]:
                 bw = i
                 break
+
+        # bw = bins.index(sbw)
 
         self.writeRegister(REG_MODEM_CONFIG_1, (self.readRegister(REG_MODEM_CONFIG_1) & 0x0f) | (bw << 4))
 
@@ -281,9 +287,9 @@ def setSyncWord(self, sw):
             # self.writeRegister(REG_IRQ_FLAGS_MASK, self.readRegister(REG_IRQ_FLAGS_MASK) | IRQ_RX_DONE_MASK)
 
 
-    def dumpRegisters(self):
-        for i in range(128):
-            print("0x{0:02x}: {1:02x}".format(i, self.readRegister(i)))
+    # def dumpRegisters(self):
+        # for i in range(128):
+            # print("0x{0:02x}: {1:02x}".format(i, self.readRegister(i)))
 
 
     def implicitHeaderMode(self, implicitHeaderMode = False):