Omega2S Reset Pin C21 shutdown instead of reset



  • I am having a problem with the Omega2S/Omega2S+ Reset pin C21.

    Per the documentation C21 is the power on reset.

    0_1526919536182_Screen Shot 2018-05-21 at 11.16.21 AM.png

    My boards have a 10k Pullup on that pin with a momentary pushbutton to ground.

    Grounding C21 does cause the Omega2S to shut down, but it does not boot back up with out a power cycle.

    The desired functionality is a full reset of the Omega2S with out a power cycle.

    Does anybody else have similar results or a real hard reset solution?



  • @Jeff-Seese Omega2s will reset, but won't be able to boot because the flash chip is still configured in 4 byte mode while the omega expects 3 byte mode after reset. You need to reset the omega2s and the flash together.



  • @wdu said in Omega2S Reset Pin C21 shutdown instead of reset:

    Omega2s will reset, but won't be able to boot because the flash chip is still configured in 4 byte mode while the omega expects 3 byte mode after reset.

    Excuse me please but this confused me a little.
    If I know well Omega (Winbond 25Q128FV), Omega2 (Winbond W25Q128BV) and Omega2S (probably same or fully equivalent flash than Omega2) each of them has a 128 Mbit / 16 MByte SPI serial flash with 24 bit (A23-A0) ie. 3 byte address.
    Please correct me if I'm wrong.



  • @György-Farkas The + versions have 32 mbyte flash, which cannot be addressed in 3 byte mode. The power on reset for the flash is 3 byte mode, after boot they are switched to 4 byte address mode.

    I only have experience with the + versions. I do not know if the normal versions use 3 or 4 byte addressing mode.



  • @wdu OK So the missing + was a typo (only ;). Thank you.


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