I think that also in my case the frequency changing is not working. I dont't have an osciloscope to check it but I have 2 devices connected on the same channel, with one of them I have communication but with the other one no, so I am suspecting that the frequency is too big for one of them, I tried to set it to 100kHz using mraa but there was no succes in getting some valid data from the second device.
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