gnupic: Re: [gnupic] need pic18fxxx programmer!!
Subject:
Re: [gnupic] need pic18fxxx programmer!!
From:
"George M. Gallant, Jr." ####@####.####
Date:
25 Jan 2006 23:44:36 +0000
Message-Id: <1138232670.4571.80.camel@scuba.home.net>
I have no expectations that the code for JTAG and PIC is similiar other
than they
use a synchronous serial data protocol. The major differences appear to
be:
PIC: Single bidirectional data line
JTAG: Separate data in and data out line
PIC: 13Volt programming
JTAG appears to be standard that allows multiple vendors to share a
common
electrical bus. Once inside the chip, each vendor creates it's own
register set.
Some provide the access info, others hide it.
If you find that the Xilinx JTAG is "universal" please post your
findings as I have
a couple of them.
George
On Tue, 2006-01-24 at 21:40 -0500, Martin Klingensmith wrote:
> I have a Xilinx JTAG cable and I have been wondering if it is compatible
> with the other forms of JTAG, I don't know if JTAG is a standard or a
> common acronym?
> --
> Martin
>
> George M. Gallant, Jr. wrote:
>
> >I plan to use the JTAG for CPLD and FPGA work. I don't want to be
> >limitted by the length
> >of the parallal port cable. Also can use USB-2-serial on laptops.
> >
> >George
> >
> >George
> >
> >On Tue, 2006-01-24 at 10:28 +0800, Chen Xiao Fan wrote:
> >
> >
> >
> >>>From: George M. Gallant, Jr.
> >>>Sent: Tuesday, January 24, 2006 9:03 AM
> >>>
> >>>I used slow bit/banger to build a 628 based serial unit. I then used
> >>>that unit develop a 18f1320 unit. Currently developing at 18f2550
> >>>that will also do jtag.
> >>>Not very difficult and the Wisp628 provides a great starting platform,
> >>>too bad the code isn't in C or assembler.
> >>>
> >>>George
> >>>
> >>>
> >>Interesting. 18F USB PICs seem to be a good choice for next
> >>generation PIC programmers. Olin is doing one with. Wouter plans
> >>to do another one. And PICkit 2 is already being done with
> >>18F2550. So does GTP USB /GTP USB Lite. It is a pity
> >>that the last one is closed source so it is only working
> >>under Windows.
> >>
> >>You also mentioned JTAG. Is it for the PIC24/dsPIC33
> >>or for other MCUs like AVR and MSP430 or LPC ARM?
> >>
> >>I agree with you that Wisp628A is a great start. And I also
> >>wish that it is written in plain assembler rather than JAL.
> >>The firmware actually fails to be built with later version
> >>of JAL.
> >>
> >>Regards,
> >>Xiaofan
> >>
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> >
>
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