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!
What do you think the problem is?
pls help me if u can.