gnupic: Re: [gnupic] About a USB programmer I found
Subject:
Re: [gnupic] About a USB programmer I found
From:
####@####.####
Date:
19 Aug 2006 20:29:17 +0100
Message-Id: <f8befa70fd4.44e77266@canarias.org>
Hello,
> 1) The 18F4550 requires a Vihh (programming voltage) of Vdd + 4.0V.
> So if you
> use my Trivial High Voltage Programmer
> (http://www.finitesite.com/d3jsys/proghvp.html)then instead of 13V
> you can use anywhere between 9V and 12V. The easiest voltage
> source probably would be a 15-16V wall wart and a LM7812 voltage
> regulator.
> 2) That schematic doesn't have any cable termination. One of my
> users discovered
> that grounding the shield through a small valued capacitor on the
> target side
> allows for long cables (longer than 2ft) to work.
Am. I though I could program it with my laptop's usb current
> Can you get temporary access to another machine with a parallel
> port? The good
> thing about using a bootloader is that programming it is a one time
> operation.So you don't need to keep a machine with another type of
> port, just use one
> long enough to get the bootloader into the PIC.
Yes I could. My sister went away with it when she married, but I could; though I'd need to buy the components, build up the circuit, install the software, etc.
>
> And you must still resolve the software issue. You asked about
> another path
> and I think one exists. Take a look at this page here:
>
> http://pic18fusb.online.fr/wiki/wikka.php?wakka=UsbBootload
>
> It's a detailed tutorial on building a PICDEM clone with
> Microchip's USB bootloader.
>
> Now there's Linux software to use this bootloader. You can find it
> here:
> http://www.internetking.org/fsusb
>
Cool, my gcc is a bit older (2.9.5.3), so it didn't compile on a first attempt because of nested unnamed structures on bootload.h. But as I'm a super-wise linux girl (jeje) managed to do it.
> Of course you're still stuck in the chicken/egg loop of getting the
> bootloaderonto the part. My THVP programmer with WinPicProg will do
> the job, but you need
> a parallel port to pull it off.
Ah. I was actually counting (or hoping) that the exe file would be a self-extracting zip so i could get the hex file from there.
So, if I build the picdem clone you pointed out --which looks really easy-- and access somehow to a bootload hex file for the 18f4550, could I do it with usb plus the needed power supply you say it needs?
>
> I hope these resources help you. I'm glad you asked the question as
> it gave me
> a chance to do some USB bootloader research on a Linux platform. In
> fact I
> think I have a 18F4550 floating around here somewhere... Hmmm.
>
> BAJ
>
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Cool. As you say in your website, some sort of "standard procedure" that allows novices to get into this would be really fine, overall for all of us which don't know about electronics at all.
Maybe because of usb pics being "relatively new", plus that almost everybody within this filed uses windows and parallel or serial ports, that there isn't still that much information on the net, or better said not enough for someone who knows some linux, but not some electronics (and is as wally as me jeje).
Best Regards,
