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STM32F407VG Timer3 configuration

Question asked by barnett.andrew on Sep 19, 2016
Latest reply on Sep 20, 2016 by FTITI.Walid
I'm new to this microprocessor, and am trying to configure Timer3 with my own code as opposed to that generated by STM32CubeMx / HAL.  This is mostly to learn the timer peripheral, but I may want to implement my own code at some point.   

I believe I've written my code correctly, but none of the data is getting written to the registers.  Is there a register or command that must be unlocked before I can access the Timer3 registers?  Where in the documentation is this described?

Thanks in advance for any assistance.