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I have two Propeller Memory Cards to give out. Who wants them? - Page 2 — Parallax Forums

I have two Propeller Memory Cards to give out. Who wants them?

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  • Mike GreenMike Green Posts: 23,101
    edited 2013-04-26 21:06
    Tested FLASH[<expr>{,<expr>}] and FLASH[<expr>{,<expr>}]=<expr> as well as ERASE <expr> and these appear to work. In archive included simple test program FLSHTEST.BAS. I suspect file level Flash I/O also works because it's unchanged, but haven't tested it yet.

    Next step: Updating PASM driver.
    zip
    zip
    MemCardBasic.zip
    2M
  • Mike GreenMike Green Posts: 23,101
    edited 2013-04-27 16:24
    PASM driver substituted for Spin driver. Low-level Flash and SRAM I/O works the same. Next step: Test loader.

    Update: boot loader appears to work
    Next step: modifying both Spin and PASM routines to use 4-bit SPI
    zip
    zip
    MemCardBasic.zip
    2M
  • David BetzDavid Betz Posts: 14,516
    edited 2013-05-29 21:24
    What ever happened to this board? Is it going to be produced?
  • Mike GreenMike Green Posts: 23,101
    edited 2013-05-29 21:51
    Just a note on progress or lack of it ... I started coding up 4-bit routines and found that they were not that much faster than really good 1-bit routines. I also got bogged down with "real work" which will continue somewhat until late July.
  • jazzedjazzed Posts: 11,803
    edited 2013-05-30 00:46
    Mike, I've seen that also. With an 8-bit solution in 2 chips (10 propeller pins total) there is a measurable difference over a single-bit solution.
  • doggiedocdoggiedoc Posts: 2,243
    edited 2013-05-30 09:22
    David Betz wrote: »
    What ever happened to this board? Is it going to be produced?
    I built the board the David sent me, but I still need to place the jumper wires required on this version. Therefore I've yet to do an code on it.
  • RaymanRayman Posts: 14,665
    edited 2013-05-30 18:13
    Mike Green wrote: »
    Just a note on progress or lack of it ... I started coding up 4-bit routines and found that they were not that much faster than really good 1-bit routines. I also got bogged down with "real work" which will continue somewhat until late July.

    I think jazzed said SQI mode can be up to 30% faster that 1-bit SPI.
    But, David Carrier did mention using 4-cogs, one per bit in 4-bit SQI mode. That should give the full 4X boost.
    Of course, small programs run just as fast off SD card as they do off big memory solutions...
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