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I2c1 problem at frequencies above 8MHZ

Question asked by Hossein Ghaheri on Jul 3, 2017
Latest reply on Jul 3, 2017 by Clive One

Hi,

I use from stm32f103c8t6.

I haven't problem with i2c1 in this micro but at frequencies above 8mhz , i2c1 does not work.

While the i2c2 has no problems at all system frequencies.

I want use usb-cdc ,for this reason I can not set the system frequency to 8mhz.

I set the system clock in the following ways , but i2c1 does not work!

system clocks

What do you think the problem is?

pls help me if u can.

tnx!

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