Preamble Length in LoRaWAN_End_Node application

[piyushy6]

Hi, I am using WL55JC1 board with STM32CubeIDE. Can you please tell how to increase the Preamble Length in End Node application [https://github.com/STMicroelectronics/STM32CubeWL/tree/main/Projects/NUCLEO-WL55JC/Applications/LoRaWAN/LoRaWAN_End_Node] ?

[ASELSTM]

Hi @piyushy6,

Allow me first to thank you for your contribution. Your question has been forwarded to our development team. We will get back to you as soon as we have more details.

With regards,

[YoannBo]

Hi,

The LoRaWAN_End_Node application is LoRaWan compliant project application. Therefore, it follows the LoraWan Alliance specification in particular the Regional Parameter specification. The Preamble format is defined in this document and hence its length is frozen. For example for Europe it is defined as:

and is defined the same way for all regions

hope it answers your question.

[piyushy6]

Thanks. Is there any example for LoRa to LoRa communication for stm32wl?

[wolsty7]

I believe this example is what you are looking for: https://github.com/STMicroelectronics/STM32CubeWL/tree/main/Projects/NUCLEO-WL55JC/Applications/SubGHz_Phy/SubGHz_Phy_PingPong

[piyushy6]

Hi, Thanks for sharing. This is specifically for Ping-Pong. Is there any way to convert this from Ping-Pong to fixed Receiver and Transmitter application? What changes should I make to use one board as receiver and one as transmitter?

[wolsty7]

You could hard code one to always have the "isMaster" state as true and one as false, forcing one top be the transmitter and one the receiver. https://github.com/STMicroelectronics/STM32CubeWL/blob/747d4e27df07dcfc995b54f8af8a0bee38dfef8d/Projects/NUCLEO-WL55JC/Applications/SubGHz_Phy/SubGHz_Phy_PingPong/SubGHz_Phy/App/subghz_phy_app.c#L252

[piyushy6]

Thanks. Can you please also tell what does the function UTIL_SEQ_RegTask((1 << CFG_SEQ_Task_PingPong_Process), UTIL_SEQ_RFU, PingPong_Process) do?

https://github.com/STMicroelectronics/STM32CubeWL/blob/747d4e27df07dcfc995b54f8af8a0bee38dfef8d/Projects/NUCLEO-WL55JC/Applications/SubGHz_Phy/SubGHz_Phy_PingPong/SubGHz_Phy/App/subghz_phy_app.c#L229

[YoannBo]

Hi,

UTIL_SEQ is the sequencer. It is not an OS but a 'run to completion' framework. (see UTIL_SEQ_RegTask registers a task. It basically 'associates' an ID (a bit map) to a function (here PingPong_Process)

Is counter part is UTIL_SEQ_SetTask. It will make the sequencer executing the registered function in the while(1) loop without any race condition. Therefore, the function can be executed in background and not in the interrupt context.

please find below a comparison between the 'standard way' and the 'sequencer way' doing exactly the same thing

Hope it answers your question

best regards

[piyushy6]

Ok, thanks.

This is my transmitter code, but I am unable to transmit anything. Can you please tell why?

Tx.c.zip

[YoannBo]

you are missing a Radio.Send(Buffer, BufferSize); line 79