iMX6 PORTSC1 register reads a connected device even though none is present

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iMX6 PORTSC1 register reads a connected device even though none is present

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shefft
Contributor IV

I have no USB devices connected, yet when I read the USBC_UH1_PORTSC1 status and control register, the CCS bit is set.  That is the Current Connect Status bit that indicates there is a device present on the port if set to 1.  This is host mode.  Seems to be a hardware problem, but I don't have enough information yet to narrow this down to the iMX6 or the hub chip that's on my Boundary Devices Nitrogen board.  Using a Solo version.  Has anyone else seen this issue?

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EricNelson
Senior Contributor II

Hi Tyler,


If you're using a Nitrogen6X or Nitrogen6X-SOM carrier board with a Solo processor, there's an SMSC USB2513B USB hub connected to the host port, so the i.MX6 should always see the connection.

The Nitrogen6_Lite board doesn't have the hub (and only has a single USB port).

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shefft
Contributor IV

Thanks for the response.  Since there's no useful documentation about these things, I'm having to piece the story together the hard way when problems pop up.

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