GabrieleF,
If you are sure about address( suggestion from me :you don't provide the
right shifted address, provide 0x42 for write).
Then may be it is due to Davinci I2c adapter driver which is not
reentrant (if your soc as more than one I2C-CONTROLLER), then make sure
that you are writing to the bus on which your device is attached.
Thanks & Regards,
Padmanabha.s
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