STM32WL5 custom pcb can't join lora

Anthony Plantin · ‎2025-06-10

Hello,

We made a custom pcb with STM32WLE5CC MCU, and with the IPD BALFHB-WL-05D3. You'll find in attachement the schematic.

We use the STM32CubeWL software. We tries the same version on the nucleo and everityhing was going well, we could join with the nucleo (Nucleo WL55JC2)

We would like some support to find out why we could not join the network, and why there is CRC error.

Our Gateway is a Multitech MTCDT-H5-210L Firmware 5.3.8s-s1

Thank you for your help

Anthony

EDIT : The problem came from the 32 MHz quartz, which had a slightly low frequency. We solved the problem with the internal capacity of the microcontroller

STTwo-32 · ‎2025-06-12

Hello @Anthony Plantin

The NUCLEO-WL55JC2 is designed to work on low band frequencies. But for the BALFHB-WL-05D3, it is a IPD used for High band STM32WL designs. So, this may be way the same SW is refusing to connect. Could you please check this.

PS: The problem came from the 32 MHz quartz, which had a slightly low frequency. You can solve the problem with the internal capacity of the microcontroller

Best Regards.

STTwo-32

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STTwo-32 · ‎2025-06-12

Hello @Anthony Plantin

The NUCLEO-WL55JC2 is designed to work on low band frequencies. But for the BALFHB-WL-05D3, it is a IPD used for High band STM32WL designs. So, this may be way the same SW is refusing to connect. Could you please check this.

PS: The problem came from the 32 MHz quartz, which had a slightly low frequency. You can solve the problem with the internal capacity of the microcontroller

Best Regards.

STTwo-32

To give better visibility on the answered topics, please click on Accept as Solution on the reply which solved your issue or answered your question.

Andrew Neil · ‎2025-06-12

@Anthony Plantin wrote:
why there is CRC error.

What CRC error?

@Anthony Plantin wrote:
Our Gateway is a Multitech MTCDT-H5-210L Firmware 5.3.8s-s1

Does it give you any diagnostics indicating what's failed, and why?

A complex system that works is invariably found to have evolved from a simple system that worked.
A complex system designed from scratch never works and cannot be patched up to make it work.