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DM648 Video Port Revisited....

JRasmussen
Intellectual 720 points

I'm still having trouble getting the Video Port on the DM648 to Reset.  We're using VP2 as a Video Capture Port.  We rechecked the schematics and found that our Video Clocks go into VP2CLK0 instead of the VP2CLK1/VCLK input pin. 

What I am finding is that I cannot reset the Video Port by the VCTL/VPRST register bit, which we know won't work due to no clock on VP2CLK1. 

I am attempting to use the VCACTL/CHRST bit to reset the VP2 channel, but I'm still not having any luck in getting the port to reset.  The documentation only says that you need a clock on VCLKIN, but does the clock also need to be preset on VP2CLK1 in order to reset?  What can I do to reset the Video Port with our clocks on VP2CLK0?

If we must provide our clocks on VP2CLK1, will the clocks work as before for our Video Capture, or do I have to configure something else to make the VP2CLK1 pin function with our clock?

Thanks,

--James

 

  • 0
    Intellectual 720 points

    Answer to my own question:

    In researching the PEREN bit in the VPCTL register, I read that the PEREN gates off the Video Clocks when not enabled.  Sure enough, when I enable this bit, my Video Port is now resetting just fine.  So I will be certain to enable the PEREN bit first, before attempting to Reset the Video Port with either the VPRST or RSTCH bits.

     

    --James