EU868 Compile Issue

[patmolloy]

I am trying to use OTAA_DHT11.ino on the Heltec Wireless Stick

In LoRaMac-definitions.h is the line ..

#define USE_BAND_915

If I compile everything (in the arduino compiler) it all works, and loads to the board correctly -- but of course on the wrong frequency for my region (915).

So I change this line to

#define USE_BAND_868

and re-compile, I get the following error ...

C:\Users\patmo\OneDrive\Documents\Arduino\libraries\ESP32_LoRaWAN-master\src\LoRaMac.c: In function 'SetNextChannel':

C:\Users\patmo\OneDrive\Documents\Arduino\libraries\ESP32_LoRaWAN-master\src\LoRaMac.c:2038:60: error: expected expression before '==' token

                         if( ( JOIN_CHANNELS & ( 1 << j ) ) == 0 )

                                                            ^

C:\Users\patmo\OneDrive\Documents\Arduino\libraries\ESP32_LoRaWAN-master\src\LoRaMac.c:2038:65: error: expected statement before ')' token

                         if( ( JOIN_CHANNELS & ( 1 << j ) ) == 0 )

                                                                 ^

Can you help?

[patmolloy]

I have resolved this by including the #defines here https://stackforce.github.io/LoRaMac-doc/group___r_e_g_i_o_n_e_u868.html and changing JOIN_CHANNELS to EU868_JOIN_CHANNELS

This works for EU868 but is NOT a general solution

[legapi]

I am trying to use OTAA_DHT11.ino on the Heltec Wireless Stick

In LoRaMac-definitions.h is the line ..

#define USE_BAND_915

If I compile everything (in the arduino compiler) it all works, and loads to the board correctly -- but of course on the wrong frequency for my region (915).

So I change this line to

#define USE_BAND_868

and re-compile, I get the following error ...

C:\Users\patmo\OneDrive\Documents\Arduino\libraries\ESP32_LoRaWAN-master\src\LoRaMac.c: In function 'SetNextChannel':

C:\Users\patmo\OneDrive\Documents\Arduino\libraries\ESP32_LoRaWAN-master\src\LoRaMac.c:2038:60: error: expected expression before '==' token

                         if( ( JOIN_CHANNELS & ( 1 << j ) ) == 0 )

                                                            ^

C:\Users\patmo\OneDrive\Documents\Arduino\libraries\ESP32_LoRaWAN-master\src\LoRaMac.c:2038:65: error: expected statement before ')' token

                         if( ( JOIN_CHANNELS & ( 1 << j ) ) == 0 )

                                                                 ^

Can you help?

This error comes from the definition of "JOIN_CHANNELS" at line 490 of LoRaMac-definition.h.
If you compare the 868MHz frequency to 433MHz and 780MHz frequency, you may see more parentheses.

868MHz (line 490)
#define JOIN_CHANNELS ( uint16_t )( LC( 1 ) )| LC( 2 ) | LC( 3 ) )
...where maybe it should be...
#define JOIN_CHANNELS ( uint16_t )( LC( 1 ) | LC( 2 ) | LC( 3 ) )

433MHz (line 142)
#define JOIN_CHANNELS ( uint16_t )( LC( 1 ) | LC( 2 ) | LC( 3 ) )

780MHz (line 361)
#define JOIN_CHANNELS ( uint16_t )( LC( 1 ) | LC( 2 ) | LC( 3 ) )

[patmolloy]

Brilliant !! Thanks :) That is definitely the issue and your solution is much better than my bodge!