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STM32F4 SystemInit I2C_SW problem

cool26happy
Associate II
Posted on November 17, 2014 at 12:44

Hello.

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?
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