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Second I2C bus generating 60 Hz square wave at SCL

Eric P
Associate

‎2018-03-15 06:51 AM

Posted on March 15, 2018 at 14:51

I have successfully implemented an initial I2C bus (I2C1) in my custom board design (using STM32F405).  I then added a second I2C bus (I2C2) to my design and have initiated it and set it up identical to I2C1.  The first bus continues to operate correctly (sending a clock signal out at 100 kHz).  I've specified the same clock frequency for the second bus.  However the SCL pin only puts out a *constant* 60 Hz square wave.  What could I be doing wrong?

#dual-i2c #i2c #scl
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waclawek.jan
Guru

‎2018-03-15 07:50 AM

Posted on March 15, 2018 at 15:50

We don't know.

Read out and check/post the relevant GPIO and I2C registers content.

JW

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