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@GeekBot
@DrAzzy, I discovered the problem looking at signals with my oscilloscope, I am quite sure that my code didn't pull down the line before, but a mistake on my side is always possible... I confess that I am a bug maker... However, if GPIOs are in high impedance state at reset, the oscilloscope can pull the line down by itself since it has a 1 M input impedance only. Anyway, the module was stuck in the break condition. I like the idea of putting a pullup, I will test it. However, when power goes on, I always fear a glitch on the GPIO that could leave the module in the deadlock. Do you think that when power goes up, that GPIO will remain in high impedance? No glitch? I have to look at the ST datasheet...