The closed thread on XINST


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Thread: The closed thread on XINST1703 days old

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    Prolific Poster towlerg's Avatar
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    Default The closed thread on XINST

    I realize somebody closed this because it had become circular (at best) but some of the information in it was just wrong.

    If you look at the PPI file of a randomly selected K device - 18F14K50 - you will see that XINST defaults to off and if you generate a Noddy program with no fuses, XINST is off.

    George
    George.

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    Prolific Poster johngb's Avatar
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    Default Re: The closed thread on XINST

    Because the fuse configurator takes the Microchip default values whatever is in the PPI file is irrelevant if you use the configurator. I will look at the possibility of overriding the defaults for the XINST fuse but I suspect this could be become the thin end of the wedge.
    JohnB

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    Senior Member Stephen Moss's Avatar
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    Default Re: The closed thread on XINST

    Hi John,
    I can understand your thin end of the wedge comment however it should not be if you only apply it to exceptional circumstances as with the XINST fuse, however even then perhaps it should only be considered as a tertiary option.

    The XINST fuse is unique in that unlike the other fuses not all its settings are currently compatible (for want of a better term) with the compiler thus the primary place to address the issue should probably be by specific mention in the user manuals, possibly backed up with a secondary notification in the form of sticky posts on XINST compatibility to both the Proton Plus Compiler v3 & Proton 24 forums.

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    Prolific Poster johngb's Avatar
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    Default Re: The closed thread on XINST

    Is there an easy way to determine if a chip supports the extended instruction set? If so I could put up a warning that the user must set XINIST to OFF for compatibility with the compiler. I would rather not put a filter on XINST in the code which loads the arrays.
    JohnB

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    Prolific Poster hadv215's Avatar
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    Default Re: The closed thread on XINST

    No there is not, I'm afraid you'll have to check the lines.
    It all depends on where you start processing the .inc lines. If you look at their structure each fuse occurs twice. First in a commented part where all settings are explained (more or less that is). The second time is in the actual _CONFIGx lines.

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    Default Re: The closed thread on XINST

    I don't want to open up the include for each device as Fuse Configurator uses the 8bit_dev.info file for information on the fuses. As the XINST is one of the fuses it can be found in this file. If it's present and "On" I could could raise a pop-up warning that XINST must be off. I would rather do that than override the defaults in 8bit_dev.info.
    JohnB

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    Prolific Poster johngb's Avatar
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    Default Re: The closed thread on XINST

    Just Changed Fuse Configurator to behave as previous post.
    Would anyone like to try it first before I release it?
    If so PM me with your Email address and I will send it to you.
    JohnB

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    Default Re: The closed thread on XINST

    I'm really not acquainted with that file, but I checked and it looks good.
    I'm happy to test the new version

    Harm

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    Default Re: The closed thread on XINST

    I don't have that file (8bit_dev.info) and goggle can't find a reference to it. Did it come wlth fuse Configurator? Maybe thats why FC behaves oddly on my machine.

    George
    George.

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    Default Re: The closed thread on XINST

    8bit_device.info

    Goto ProtonIDE\PDS\Includes and there you will see it.
    Also you will find it with MPASM assuming you have installed MPLAB.
    JohnB

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    Default Re: The closed thread on XINST

    How odd. Thats the first time (that I know of) that "Everything" has let me down. The file is exactly where you said it was, maybe finger trouble on my part.

    Also odd because I had previously declared today as my lucky day (while pumping bilge, glasses slide off nose into harbor, 6 hours later at low water, see glasses in mud and hook them out)

    George
    George.

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    Default Re: The closed thread on XINST

    That happend to me a while back.
    It was dusk, and we were anchoured off Peter Island in the BVI.
    I was cleaning the side of the boat when my glasses fell into the water.
    We searched for them but never found them.
    I ended up for the rest of the cruise with just my sunglasses to read charts and resaurant menus.
    Looking back at the photos, it made me look like a real poser, not a good look at my age!!!
    JohnB

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    Default Re: The closed thread on XINST

    I had more luck. Back in 75 we went to sea after a meeting. I walked into the sea when a wave made me aware I had my glasses on. That is had, because they were gone.
    Did some searching (the water is pretty shallow at the beach) and quite to my big surprise I found them back after 5 minutes.

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    Default Re: The closed thread on XINST

    Just tested it. One with an 18F that does not support the Extende Instruction set: OK. One with xinst default off: Ok. One with xinst default on: message appeared saying to switch it off.

    Regards
    Harm

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