CubeCell AB01 v1.2 - SX1262 init errors

[d00m178]

hi!

Im checking how to make CubeCell devices work with RadioLib library.
Im using AB01 v1.2 and this example - SX126x_Receive_Interrupt.ino

I changed code to use it with Cubecell - commented line 32 and uncommented line 39:

// or using CubeCell
SX1262 radio = new Module(RADIOLIB_BUILTIN_MODULE);

if I use:

int state = radio.begin(915.0, 125.0, 7, 1, 0x12, 10, 8, 0, false);
or
int state = radio.begin(868.0, 125.0, 7, 1, 0x12, 10, 8, 0, false);

I receive:

Copyright @2019-2020 Heltec Automation.All rights reserved.
[SX1262] Initializing ... failed, code -707

if I use:

int state = radio.begin(868.0, 125.0, 7, 1, 0x12, 10, 8, 1.6, false);

init error is:

Copyright @2019-2020 Heltec Automation.All rights reserved.
[SX1262] Initializing ... failed, code -10

if I use default int state = radio.begin();
it seems start to work:

[SX1262] Initializing ... success!
[SX1262] Starting to listen ... success!

but how to check what the current LoRa settings?

when I run second AB01 device with code examples/SX126x/SX126x_Transmit_Interrupt/SX126x_Transmit_Interrupt.ino and default radio.begin() - these two devices starts communication between each other - I can see in terminaloutput:

"[SX1262] Sending another packet ... transmission finished!"
in the terminal of sender device and

[SX1262] Received packet!
[SX1262] Data:		Hello World! #15
[SX1262] RSSI:		-110.00 dBm
[SX1262] SNR:		3.75 dB
[SX1262] Frequency error:	-17.44 Hz

in the terminal of receiver device.

but how to check this current settings which devices using for communication?
and how to configure my own settings? at least Frequency and SyncWord - I need use CubeCell devices with another LoRaWAN device so Im checking the examples to know how to prepare my own firmware.
any inputs would be useful.
thank you.

[jgromes]

if I use:

int state = radio.begin(868.0, 125.0, 7, 1, 0x12, 10, 8, 1.6, false);

init error is:

Copyright @2019-2020 Heltec Automation.All rights reserved.
[SX1262] Initializing ... failed, code -10

Have you investigated this -10 error code? It doesn't seem so, because doing that you will find this page. That will tell you -10 is RADIOLIB_ERR_INVALID_CODING_RATE - unsurprising, since you have set the coding rate value to 1, while the accepted range is 5 to 8. The -707 error is also explained on that same page.

but how to check what the current LoRa settings?

By reading the intro to the example(s), which says:

  For default module settings, see the wiki page
  https://github.com/jgromes/RadioLib/wiki/Default-configuration#sx126x---lora-modem

Following that link will take you to a wiki page that lists exactly what you're looking for.

[d00m178]

That will tell you -10 is RADIOLIB_ERR_INVALID_CODING_RATE - unsurprising, since you have set the coding rate value to 1, while the accepted range is 5 to 8

thank you!
but how to find the full list of coding rates values? which rates means "5-8" values?
I set up 1 because I took this value from Heltec examples:

#define LORA_CODINGRATE                             1         // [1: 4/5,
                                                              //  2: 4/6,
                                                              //  3: 4/7,
                                                              //  4: 4/8]

and I didnt realize that for RadioLib library this values maybe different..

UPD:
ok I found this:
https://jgromes.github.io/RadioLib/class_s_x126x.html#afd3113858966e878e9c67a1e710bd586
and seems 5-8 it is the denominators for 4/*

so if I set 5 it would be 4/5

also - code start to work with
int state = radio.begin(868.0, 125.0, 7, 5, 0x34, 10, 8, 1.6, false);
Im still not sure if "1.6" is correct value for CubeCell but at least AB01 print output:
[SX1262] Sending another packet ... transmission finished!

the only issue so far - I can not receive this on my receiver (RPI4 + Waveshare LoRaWAN SX1262 HAT) side but I will create new post about this.
thank you again for you work on this library.