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MikroBus GPIO

MATRIX7878

Hello,

     I am using a ZuBoard 1CG and am trying to use the MikroBus as GPIO pins so I can program a parallel LCD screen.  I am getting strange signals coming out of the pins.  Even just alternating GPIO signals creates strange results.  There are large multi-second gaps for some lines, some have random switches and some keep running forever despite a stop condition.  From the schematic, the only IC between the SoC and MikroBus connector is a 1.8 V to 3.3 V converter.  Why would I have strange behavior?

Thank you

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  • 0

    There is no enable/disable pin and the cables connected to MikroBus and the LCD are no longer than three inches.

    This is the converter:

    image

    I cannot short any of the connections for the MikroBus as they go straight from the SoC, to the voltage converter, to the MikroBus.  I have measured the voltage going into the converter and it measures 1.8V.  The VDD_CLICK voltage is 2.5-3.0V.  None of the pins are generators, they are all I/O.

    Is this the joint you are referring to?

    image

    If so, they stopped soldering on that part it seems.  Other than that, there are no SMD midair pins.  The board I have is less than two months old.  I would highly doubt that they would still have that same mistake now a days.

    I do appreciate your efforts, thank you.

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  • 0

    There is no enable/disable pin and the cables connected to MikroBus and the LCD are no longer than three inches.

    This is the converter:

    image

    I cannot short any of the connections for the MikroBus as they go straight from the SoC, to the voltage converter, to the MikroBus.  I have measured the voltage going into the converter and it measures 1.8V.  The VDD_CLICK voltage is 2.5-3.0V.  None of the pins are generators, they are all I/O.

    Is this the joint you are referring to?

    image

    If so, they stopped soldering on that part it seems.  Other than that, there are no SMD midair pins.  The board I have is less than two months old.  I would highly doubt that they would still have that same mistake now a days.

    I do appreciate your efforts, thank you.

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