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Video shift register question — Parallax Forums

Video shift register question

richaj45richaj45 Posts: 179
edited 2015-01-08 09:39 in Propeller 2
Hello:
Forgive me if this is answered already be the forum is devilish had to search.

It would be good if the Video logic could have an option as a general purpose serial I/O shifter for serial communications.
Since it is a shift out kind of gadget, it would make sense to me that it would not take much to make it a shift in gadget also and from there make it a simple hardware 32-bit shifter to facilitate serial I/O that is done with bit-banging now.

Whats anybody think?
rich

Comments

  • kwinnkwinn Posts: 8,697
    edited 2015-01-08 08:12
    That has been suggested many times by many people and is a very good idea. Some form of that will be in the P2, and if a version 2 of the P1 was ever done I am sure that would be one of the changes made to it.
  • jmgjmg Posts: 15,175
    edited 2015-01-08 09:39
    richaj45 wrote: »
    It would be good if the Video logic could have an option as a general purpose serial I/O shifter for serial communications.
    Since it is a shift out kind of gadget, it would make sense to me that it would not take much to make it a shift in gadget also and from there make it a simple hardware 32-bit shifter to facilitate serial I/O that is done with bit-banging now.

    I think this is on the to-do list - as mentioned above, certainly In added to Out is a common request.
    IIRC last status of this was Chip was implementing a Dual port CLUT (Colour look up table) table, with a DDS read clock scheme.
    (It can burst fill at the core clock rate)
    Ideally, with options for both Analog video (DAC), and LCD style video (many pins )
    I think this could also be FIFO on read.

    The smart pin cells will also have counters and shifters.
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