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STM32F4 SystemInit I2C_SW problem

Question asked by on Nov 17, 2014
I use software I2C for communication with DS1307 because hardware is using for other peripheral.
This is working corectly without SystemInit();
When I use SystemInit(); DS1307 not return ack. 
I set up same clock period in first and second case, LogicAnalyzer show correctly output signal, but DS1307 not return ack in second case.
Where is a problem?