gnupic: Re: [X_SPAM] Re: RE: [gnupic] Programmer for 18f2550
Subject:
Re: [X_SPAM] Re: RE: [gnupic] Programmer for 18f2550
From:
Julian Green ####@####.####
Date:
19 Oct 2005 14:16:47 +0100
Message-Id: <20051019140333.P42096-100000@pschulz.london.corp.yahoo.com>
For those interested:
At present my programmer is not working, but it does produce the waveforms
that are shown in the programming spec so things are looking promising.
It interfaces to the host computer via 3 wire RS232. It may be possible
to use the power from the RS232 interface to power the programmer and
provide vpp, but at present this is done by external PSU. Its wired up on
a small peice of bodge board.
The host computer sends the 3 bytes (as per programming spec) to the
programmer that simply acts as a protocol converter turning the RS232 into
clock, data, and vpp. The programmer then echos back the hiByte, which
can be used to verify that the comms line is working and also read values
from the device. The spare upper 4 bits of the command byte are used as
programmer control bits.
Julian
On Wed, 19 Oct 2005, Xiaofan Chen wrote:
> For ready-made programmer, look at Microchip
> PICkit 2 at US$35+shipment. It is a USB programmer
> and more. pickit-devel project is developing Linux
> based host software for PICkit 2.
>
> For DIY, maybe GTP-USB lite seems to be a good USB
> counterpart of Wisp628.
> http://perso.wanadoo.es/j1m/proyectos/gtpusblite/index.htm
> Together with WinPIC800, it is a nice programmer as well.
> It is not open source though so alternative firmware and
> host software needs to be developed for Linux.
>
> Regards,
> Xiaofan
>
>
> On 10/19/05, ####@####.#### ####@####.#### wrote:
> > Hi
> >
> > Perhaps there would be even more responds if would give some more
> > information on your programmer, like USB/RS232/Parallel,
> > intelligent/nonintelligent and so on. I personally am always interested
> > in things others build. Although I own a wisp628, if you would have some
> > information online I definitely would have a look at it. It can't hurt
> > ;)
> > By the way, I'm still planning to build a USB programmer. What happened
> > to all the good ideas and plans about the DIY USB programmer we (list)
> > talked about some time ago?
> >
> > Cheers,
> > Ezra.
> >
>
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