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STM32Cube IDE I2C does not work

HVats.623
Associate

I'm using the STM32Cube IDE latest version. The code generated for I2C doesn't work, hangs waiting for flag. My device is STM32F407VE, I'm using I2C1 (PB6, PB7). The slave sends a valid ACK but then everything goes quite with SDA SCL both low. I confirm that the slave and connection setup works fine with MCU from another vendor.

I've read almost every solution I could find on this forum but so far nothing worked for me. I do not have much experience with ST products.

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