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Arduino Forum Pickit2 as ISCP for picaxe
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Pickit2 as ISCP for picaxe

billabott
billabott over 13 years ago

Okay, the PICAXE is a PIC with a Boot Loader, like 'Duino but has a B.A.S.I.C. interpreter included.  So the claim was made on the WWW somewhere that the PICkit2 singnals can be inverted and used to program the PICAXE in the way similar to how we program  sketches into the 'Duino.  The inversion can be done in the PICkit2 software configuration OR the ISCP signals can be passed thru a HEX INVERTER IC.   The rub comes on knowing if the hex inverter IC must be OPEN COLLECTOR or not.  Personnally, I am thinking that the inputs on the PIC are cmos like and don't require much drive to get the job done.  But I really don't KNOW.    Opinions please, anyone, especially those with hands on experience.   Thanks.

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  • billabott
    billabott over 13 years ago

    Upon thinking about it some more.  I have decided that the data bytes coming over the ICSP must be inverted.  It is clear as to the why comes down to the MCLR pin.  If it is set low on the PIC then the boot loader gets wiped away by the new program and you no longer have a PICAXE - just a PIC.  In the case of the PICAXE, the bootloader is simply reading a stream of bytes and putting them in storage, and then running them as interpreted bytecode.  Of course, the whole setup came about with the products' creators wanting to make an exclusive revenue producing HW & SW ecosystem.  No problem here with their doing that.

    I still don't see the need for Open Collector interface between the PicAxe and the ICSP whether it be a PICKIT2 or some other $$ piece.

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  • billabott
    billabott over 13 years ago

    Upon thinking about it some more.  I have decided that the data bytes coming over the ICSP must be inverted.  It is clear as to the why comes down to the MCLR pin.  If it is set low on the PIC then the boot loader gets wiped away by the new program and you no longer have a PICAXE - just a PIC.  In the case of the PICAXE, the bootloader is simply reading a stream of bytes and putting them in storage, and then running them as interpreted bytecode.  Of course, the whole setup came about with the products' creators wanting to make an exclusive revenue producing HW & SW ecosystem.  No problem here with their doing that.

    I still don't see the need for Open Collector interface between the PicAxe and the ICSP whether it be a PICKIT2 or some other $$ piece.

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