Porting ST67W6 from Nucleo U575ZI to custom baord with U575CI fails

[AWack]

Hi,

I´m trying to migrate the example Application p2pServer (BLE) from the Nucleo board to a custom board with an STM32U575CI, but it fails initializing:

#### Welcome to ST67W6X BLE P2P Server Application #####<\n>
# build: 17:52:14 Mar 18 2026<\n>
--------------- Host info ---------------<\n>
Host FW Version: 1.2.0<\n>
[ERROR] [4000] [ST67W6XTask] (w61_at_sys.c:340) sem_if_ready not received<\n>
[ERROR] [4000] [ST67W6XTask] (w61_at_common.c:375) sem_if_ready not received<\n>
[ERROR] [4000] [ST67W6XTask] (w61_at_sys.c:312) Could not init Modem handler<\n>
[ERROR] [4000] [ST67W6XTask] (main_app.c:975) [ERROR] in W6X_Init API<\n>
[ERROR] [4000] [ST67W6XTask] (w6x_sys.c:115) W61 Init failed<\n>
[ERROR] [4000] [ST67W6XTask] (main_app.c:401) Failed to initialize ST67W6X Driver

Any idea what could be the problem?

Best

Achim

[TDK]

What is different between the two boards? Start there.

[Andrew Neil]

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@AWack wrote:

I´m trying to migrate the example Application p2pServer (BLE) from the Nucleo board ...

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Have you got it working on the Nucleo board?

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@AWack wrote:

... to a custom board with an STM32U575CI

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Please show your schematic.

Before the full port, have you proved your basic SPI comms?

Have you used a scope and/or logic analyser to see what's happening on the interfaces between the Host and the ST67W6 ?

Compare & contrast the working & non-working cases ...

Instrument your code so see what's happening.

[AWack · Accepted solution]

Now it´s working. I´ve forgotten to set the SPI related IOs to Very High Speed...