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write failure on com 4 — Parallax Forums

write failure on com 4

PFloyd36069PFloyd36069 Posts: 135
edited 2008-08-10 19:55 in Propeller 1
why does it keep telling me that there is a write failure on com 4? if i take away some of the code then it will let me program it but thats the only way i can get it to work.

Comments

  • LeonLeon Posts: 7,620
    edited 2008-08-10 08:44
    A failed memory location?

    Leon

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  • PFloyd36069PFloyd36069 Posts: 135
    edited 2008-08-10 17:55
    what do i need to do to fix the problem
  • Mike GreenMike Green Posts: 23,101
    edited 2008-08-10 18:05
    Does your program download properly if you download to RAM? If so, then the EEPROM may have a bad location. If your EEPROM is socketed, then you can get a new one and just plug it in. If not, then you could unsolder it and solder in a new one or send it to Parallax for them to replace it. One question is: Why did the EEPROM fail if it in fact has failed? If you've been writing data to it with your program, you may have worn out a location by writing to it too much. If not, it may just be a bad part since just downloading to the EEPROM can't wear out a location (it's good for 100,000 or more write cycles).
  • PFloyd36069PFloyd36069 Posts: 135
    edited 2008-08-10 18:19
    no it doesnt download even if i try to only dowload to the RAM. Is that a problem in the prop chip then? Also do they charge you to repair it or do the offer any kind of warranty.
  • Mike GreenMike Green Posts: 23,101
    edited 2008-08-10 18:34
    If it won't download to RAM, then it's more complex. It's possible, but very unlikely that it would be the Propeller itself. It could be some problem with the Propeller Tool or Windows although that would usually cause a different error message. I suggest you call Parallax Customer Support on Monday and they can lead you through some troubleshooting steps. Parallax is very good at replacing things that fail through no fault of the customer. They will repair for a reasonable fee things that are likely broken due to some mishap on the part of the customer.
  • PFloyd36069PFloyd36069 Posts: 135
    edited 2008-08-10 18:38
    should i try installing the prop tool on a different computer and run the program before i call or just call.
  • jazzedjazzed Posts: 11,803
    edited 2008-08-10 18:42
    Make sure your Propeller Tool is up to date. Older versions have COM problems in some PC environments; 1.1+ works fine.

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  • PFloyd36069PFloyd36069 Posts: 135
    edited 2008-08-10 18:44
    I am currently running version 1.1.....Shouldnt all programs above a certain size attempt to use this············· "Bad Location" and cause the error or am i thinking wrong? The program with the error is only a total of 1113 longs while propdos is a total of 6511 longs and it works just fine.

    Post Edited (PFloyd36069) : 8/10/2008 6:52:24 PM GMT
  • LeonLeon Posts: 7,620
    edited 2008-08-10 19:55
    PropDOS might just happen to have FF at that location. It might even be something called "pattern sensitivity". It's unlikely, though.

    Try a few programs and see what happens.

    Leon

    ▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
    Amateur radio callsign: G1HSM
    Suzuki SV1000S motorcycle

    Post Edited (Leon) : 8/10/2008 8:01:30 PM GMT
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