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RE: TMS570LS3137 MibSPI GPIO pin toggling

Jon Pollack
Prodigy 140 points
Other Parts Discussed in Thread: HALCOGEN, TMS570LS3137

I hope this thread is the right place to ask this question.
I am using the TMS570LS3137 zwt package. I am trying to use MIBSPI3SOMI[0] as a GPIO ( I am also using MIBSPI5CS[2] as GPIO with no trouble). The same code I am using on MIBSPI5 (with the base address and pin id changed) doesn't work on MIBSPI3. I was reviewing my Halcogen project and noticed the SOMI pin (V8) doesn't show in the pinmux section. The MIBSPI5CS[2] does however (which is working ok)....

Not sure what my issue is.... Any thoughts?
  • 0
    TI__Guru 59540 points
    Hi Jon,

    Note that I split your post to a new thread all its own since it is better to post new questions to a new post for better response/support as well as easier searching and availability for others who might have the same issue.

    In regard to your issue, the absence of the V8 pin in the PINMUX selection table is because there is no alternative function on the V8 pin. i.e., it is MIBSPI3SOMI[0] only and no other functions are mapped to it so no options to change it.

    Have you selected the GPIO functionality for the MIBSPI3SOMI pin? i.e., non-functional/GPIO mode of operation in the MIBSPI3 Port settings in Halcogen? The CS pins default to the GPIO (non-functional) mode so if you missed this, it could be that one is working and the other not for this reason.