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yeah

Discussion in 'Microcontrollers' started by TKS, May 13, 2004.

  1. TKS

    TKS New Member

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    ok but i want a manner that is less expensive a floppy drive costs 10euro's brandly new..

    Ok, i'm gonna use a IDE CD_ROM is this gonna work..???

    TKS
     
  2. Nigel Goodwin

    Nigel Goodwin Super Moderator Most Helpful Member

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    Again, where are you going to store all the data? - disk operating systems don't allow you to read a single byte, only complete tracks or sectors - it's not just FDD that work in that way.
     
  3. TKS

    TKS New Member

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    ...

    ...If u use a HDD i'm just reading that you can read it sector by sector..

    and that are 256 words (1 word = 2bytes) soow you are reading 512bytes

    per sector..??

    is it still not possible..??

    TKS

    maybe this says you something..

    http://hem.passagen.se/communication/ide.html

    don't you know many people making MP3 players using cd-roms and HDD's... the most of them use avr's..

    but there are a pair who use a pic..

    www.mp3projects.com is down..but there earlier where all te projects and their sites.. :(
     
  4. dave

    Dave New Member

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  5. Nigel Goodwin

    Nigel Goodwin Super Moderator Most Helpful Member

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    Re: ...

    Where are you going to store 512 bytes in a 16F84?, or even a 16F877?.

    I think they probably use external memory, some of the larger PIC's do allow that, and you can actually connect external RAM to the ports of a 16F877, and address it manually from the port pins.

    Perhaps you could explain what your project is actually going to do?, and why you feel the need to make it customer upgradeable?.

    If it's only an occasional upgrade, you could mount the processor on a plug-in board, and simply send a replacement board - presumably these upgrades would be chargeable?, and you could charge a lot more for an upgraded PCB!. If it's a frequent upgrade, perhaps you need to reconsider your design? - although, depending what your project is, there may be a good reason for it.

    Try looking on the PICList here
    http://www.piclist.com/techref/drives.htm, you may find it useful.
     
  6. TKS

    TKS New Member

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    ...

    I'm planning to use

    only big pics...

    a 18F442


    TKS
     
  7. TKS

    TKS New Member

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    18F442

    40Mhz // 10Mhz

    • Linear program memory addressing to 32 Kbytes <== is this the _____________________________external ram you are talking about..??

    • Linear data memory addressing to 1.5 Kbytes

    On-Chip Program Memory
    FLASH (bytes) # Single Word Instructions On-Chip RAM (bytes) Data ROM (bytes)

    PIC18F442 16K 8192 768 256


    hope you can give me the answer and can tell me where to look at..

    you have to imagine my world,

    don't have any friend who has knowledge about this
    and @ school i do mechanical..

    soow i lova guys for helping me..

    TKS
     
  8. Matt(Pic progger)

    Matt(Pic progger) Member

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    :idea:

    How about using Multimedia/SecureDigital cards like used in camera's etc, the data sheets for these are open source and they use a standard bus, very easy to use (can't remember the name, not ic'2 the other 1! 3 wire-job).

    Oh and they are cheap :wink:
     
  9. TKS

    TKS New Member

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    ...

    maybe Nigel knows..??
     
  10. Exo

    Exo Active Member

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    connecting a compactflash card to a pic can be done...
    in fact, its been done numerous time for mp3 players. search the net
     
  11. TKS

    TKS New Member

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    ok...thats better news...

    how fast will the transfer rate will be..??

    and owjah.

    is there then any maximum storage cap..??

    TKS
     
  12. Nigel Goodwin

    Nigel Goodwin Super Moderator Most Helpful Member

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    Re: 18F442

    I've never used any 18 series PIC's (and don't currently have any plans to) - you really ought to look on the PICList, and probably sign up to their mailing list.
     
  13. TKS

    TKS New Member

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    fff

    aahh but can't you tell me if the memory

    is be ablte to put the 512bytes..??

    TKS
     
  14. Nigel Goodwin

    Nigel Goodwin Super Moderator Most Helpful Member

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    Re: fff

    Not without reading the datasheet, and presumably you could do that yourself?.
     
  15. Exo

    Exo Active Member

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    Re: ok...thats better news...

    Speed depends on what you want to do with the data , if you just want to read it from CF and immediately pass it on to another device then a 40Mhz pic should be able to handle 25 - 50 kb /sec or so...
    If the data needs processing then this drops significantly...

    CF cards can go up to gigabytes
     
  16. TKS

    TKS New Member

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    pic mem..

    but i posted already a bit of the data sheet..

    don't know wy you are all sow short in the typing..

    a pic only works if he can communicate clear..

    TKS
     

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