Send sample with lora not working in custom board with nrf52832

RE: Send sample with lora not working in custom board with nrf52832

Simonr — Wed, 08 Jan 2025 15:02:38 GMT

The transfers become faster and you're also now able to actually see LORA transmissions?

When the radio is running, the 32MHz crystal should indeed be on, but this is generally something the controller handles itself. Since it works at lower speeds, maybe the crystal(s) aren't tuned correctly. Do you have the datasheets of the crystals and I will take a look at their load capacitance and come back to you with some suggested load capacitor values.

Just for reference, what speed is your SPI running at now?

Best regards,

Simon

RE: Send sample with lora not working in custom board with nrf52832

Illia Alexandrov — Wed, 08 Jan 2025 14:17:43 GMT

I have two crystals, one at 32 kHz, the other at 32 MHz. Maybe the module needs more frequency and can't turn on 32 MHz or something. By the way, I reduced the SPI frequency by half and the transfers became noticeably faster.

RE: Send sample with lora not working in custom board with nrf52832

Simonr — Wed, 08 Jan 2025 13:43:35 GMT

What do you mean by "missing clock speed" in this context? What clock are you referring to, and do you mean that it's incorrectly calibrated or that it's configured incorrectly/not at all somewhere?

Best regards,

Simon

RE: Send sample with lora not working in custom board with nrf52832

Illia Alexandrov — Tue, 07 Jan 2025 16:15:04 GMT

Hello. Thanks for the answer. If you look at the driver code, it seems that this occurs through the calculation of airtime (transmission takes too long). If you take the function without checking, the transmission will take 2-3 times longer than in the picture from the receiver. I thought maybe this is due to the missing clock speed or something like that?

RE: Send sample with lora not working in custom board with nrf52832

Simonr — Tue, 07 Jan 2025 15:07:26 GMT

LORA is not really supported by Nordic in particular, and this is a Zephyr specific sample project, so we're not too familiar with it. I would say the first step here would be to enable some debugging in your config files to get some more logging information, as these error messages don't provide any error message or code that points to why the transmission fails.

Then, if you can't get anywhere by debugging, please try asking in the Zephyr Discord channel for example which is a great place to get help or information on Zephyr related matters.

Best regards,

Simon