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Computerman29
Joined: 23 Jul 2006
Posts: 124
Helped: 4
Location: Valparaiso, IN USA
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 20 Apr 2007 10:41 Re: GTP USB schematic ? |
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| I have only 18f4550, and can't find others at this time (and maybe so far). So, can I use 4550 for above gtp usb schematic with the same hex file? I read in datasheet and nothing is diffenrent excepts memory Smile |
The 18F2550 is a 28-pin device. The 18F4550 is a 40-pin device. The 2550 has fewer I/O pins and fewer ADC channels. They are otherwise identical. They have the same amount of code ROM, data ROM, RAM, and other than as stated above, the same peripherals.
Since the 4550 has more pins, you would have to change the layout to accommodate the larger chip. IMHO, more trouble than it is worth. Besides, you can't get the firmware for the plus version. You must purchase a 2550 with firmware installed.
Peace,
Computerman29
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Kripton2035
Joined: 19 Jul 2001
Posts: 419
Helped: 8
Location: Earth
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| 20 Apr 2007 11:34 GTP USB schematic ? |
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| and now I think you must purchase the complete kit... the pic preprogrammed is not available anymore...
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gamal
Joined: 20 Jun 2007
Posts: 1
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| 20 Jun 2007 20:21 GTP USB schematic ? |
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hello all and thanks about your efforts,
i want to ask about the source file of the firmware how can i get it?
Added after 1 minutes:
hellooooooooooooooo
any body her
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pini_1
Joined: 18 Jun 2007
Posts: 116
Helped: 7
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| 20 Jun 2007 20:26 Re: GTP USB schematic ? |
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I have started to document a full speed USB project. I'll soon put the verilog code, once I end the documentation.
http://bknpk.no-ip.biz/usb_1.html
http://bknpk.no-ip.biz
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Kripton2035
Joined: 19 Jul 2001
Posts: 419
Helped: 8
Location: Earth
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| 20 Jun 2007 22:03 Re: GTP USB schematic ? |
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| gamal wrote: |
hello all and thanks about your efforts,
i want to ask about the source file of the firmware how can i get it?
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please read the thread from the beginning...
you can only buy the preprogrammed pic18f2550...
you can't buy the hex file...
so you can't also get the firmware !
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kasama29
Joined: 12 Jul 2007
Posts: 1
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| 12 Jul 2007 14:21 Re: GTP USB schematic ? |
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| Moderation: |
| the thing which are freely on net do not upload |
i have the version GTP USB lite
the file include .hex file for the pic 18f2550
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Kripton2035
Joined: 19 Jul 2001
Posts: 419
Helped: 8
Location: Earth
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| 12 Jul 2007 20:46 Re: GTP USB schematic ? |
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| kasama29 wrote: |
i have the version GTP USB lite
the file include .hex file for the pic 18f2550 |
please dont post things that are freely available on internet...
http://ali3nworld.blogspot.com
and that are described one page before !!!!
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hassan1980
Joined: 14 Jan 2005
Posts: 209
Helped: 3
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| 17 Jul 2007 9:27 Re: GTP USB schematic ? |
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Where is the schematic for this programmer?
www.sprut.de/electronic/soft/usburn/usburn.htm
I am waiting your replies
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Fragrance
Joined: 26 Jul 2002
Posts: 1315
Helped: 23
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| 17 Jul 2007 11:28 Re: GTP USB schematic ? |
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| hassan1980 wrote: |
Where is the schematic for this programmer?
www.sprut.de/electronic/soft/usburn/usburn.htm
I am waiting your replies |
schematic
http://www.sprut.de/electronic/pic/projekte/brenner8/b8p_r4_sch.gif
pcb design
http://www.sprut.de/electronic/pic/projekte/brenner8/b8p_r4_lay.gif
layout design
http://www.sprut.de/electronic/pic/projekte/brenner8/b8p_r4_bst.gif
pcb design in eagle format
http://www.sprut.de/electronic/pic/projekte/brenner8/brenner8p4.zip
part list
http://www.sprut.de/electronic/pic/projekte/brenner8/b8p4_partlist.txt
strip board plan
http://www.sprut.de/electronic/pic/projekte/brenner8/b8pr4_lochraster.zip
latest software and firmware for pic
http://www.sprut.de/electronic/soft/usburn/usburn15rc2.zip
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laidkerman
Joined: 20 Jul 2007
Posts: 14
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| 20 Jul 2007 1:56 Re: GTP USB schematic ? |
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this is your usb gtp schematic
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jhonilson
Joined: 08 Sep 2007
Posts: 3
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| 08 Sep 2007 17:00 Re: GTP USB schematic ? |
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GTP USB LITE need external power supply??? How many volts must be it???
thanks
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wme837
Joined: 09 Aug 2007
Posts: 3
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| 11 Sep 2007 19:45 GTP USB schematic ? |
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| anyone know configuration bit to program pic18f2550 firmware .... for GTP USB Lite.....
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nodirbek13
Joined: 08 Oct 2007
Posts: 4
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| 12 Oct 2007 20:08 Re: GTP USB schematic ? |
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| does anyone have SMD layout for GTP USB Lite?
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blueroomelectronics
Joined: 17 Sep 2006
Posts: 1230
Helped: 61
Location: Toronto, Canada
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| 14 Oct 2007 15:20 GTP USB schematic ? |
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Instead of building a third party programmer, with the addition of only a few parts you can build a PICkit 2 clone SE, see my Junebug post in these forums. The Junebug contains a simplified PK2 clone (18F2550) and a PIC Tutor on the same PCB.
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nodirbek13
Joined: 08 Oct 2007
Posts: 4
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| 15 Oct 2007 11:22 Re: GTP USB schematic ? |
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| blueroomelectronics wrote: |
Instead of building a third party programmer, with the addition of only a few parts you can build a PICkit 2 clone SE, see my Junebug post in these forums. The Junebug contains a simplified PK2 clone (18F2550) and a PIC Tutor on the same PCB.
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Thanks Bloeroomelectronics, seems like a nice tool.
I am still curious about the SMD version of GTP-USB Lite.
on my first trial i used smd BAS16 instead of 1N4148 diodes and smd BC847B instead of BC548. so i get the know problem with the programmer passing the test but when i try to read, write, detect the device shuts down with a known "Error - No is answer of hardware"
After making one according to details from http://ali3nworld.blogspot.com/ i ran into the same problem.
please help.
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blueroomelectronics
Joined: 17 Sep 2006
Posts: 1230
Helped: 61
Location: Toronto, Canada
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| 15 Oct 2007 19:05 GTP USB schematic ? |
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I can't help you with the GTB and I can fathom why anyone would build it anymore. A bare bones PK2 clone is almost the same design, supports MPLAB, has a debugger for many 16F & 18F PICs, does not require a special driver for the USB (it's a HID device) gets software updates from Microchip...
Same 18F2550 as the GTB just a couple more transistors and an inductor for a superior and programmable VPP pump. (The GTB is a fixed voltage tripler design)
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miki123
Joined: 16 Oct 2007
Posts: 2
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| 16 Oct 2007 19:12 Re: GTP USB schematic ? |
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ne moz to bez kabla
Added after 9 minutes:
bije na masu
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1bastl
Joined: 16 Oct 2007
Posts: 2
Location: czech rep
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| 16 Oct 2007 21:31 GTP USB schematic ? |
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hi electronics,
i have built gtp usb lite from http://ali3nworld.googlepages.com/download
first time it didnīt worked, my notebook asus a6km with sis chipset didnīt communicate good, i had to buy kouwell 2002-2 with 2 usb ports and chipset via, now it si perfect
you can program firmware first by gtp 3.55g with jdm, it works good, crystal i have tried 4, 10, 12 and 20 mhz, you must only set it in the config word
when programming
gtp usb lite is very fast, i recommend
meet in silicon hell 
Added after 14 minutes:
the error by me was the same, as described above, detection was good, but read or write - "Error - No is answer of hardware"
the main problem is in usb in pc
add cond. 10-100uf into vdd-vss, it is better connection
Added after 10 minutes:
i have add yet resistor 20k on rb3-to-vss, because base voltage of the transistor was about 0.5v in off status
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nodirbek13
Joined: 08 Oct 2007
Posts: 4
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| 17 Oct 2007 18:53 Re: GTP USB schematic ? |
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1bastl thanks,
I have already had a 100uF/25v from VDD to ground. will it help if i buy a USB hub with a power adapter?
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1bastl
Joined: 16 Oct 2007
Posts: 2
Location: czech rep
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| 17 Oct 2007 20:18 GTP USB schematic ? |
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hello nodirbek,
i have tested with usb hub starhub201 from msi and when pc usb chipset didnīt work, hub didnīt too
when you use any hub with external power, i donīt know, but i thing, it will not function
maybe the easiest way could be to try gtp usb lite on other computers, one friend tested it on nvidia nforce and it didnīt worked
as i have said, to me it works with via chipsets, it is probably in better communications protocol or 18f2550 supports only some chipsets...
Added after 51 minutes:
one more note:
i have a usb-to-serial cable, on sis usb chipset it works, but the connection is about 50 pct, on my new via usb controller it is 100 pct
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nodirbek13
Joined: 08 Oct 2007
Posts: 4
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| 18 Oct 2007 21:40 GTP USB schematic ? |
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| Thanks. I will try to make a parallel pic programmer. any one knows an easy pic programmer for dsPIC chips?
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funnynypd
Joined: 09 May 2007
Posts: 675
Helped: 17
Location: USA & Canada
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| 24 Nov 2007 17:54 GTP USB schematic ? |
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For PIC user and DIY fans, here is a sate-of-the-art SMD PICkit2 you can build (bare board and component kit are all available):
http://www.auelectronics.selfip.com/Hardware-CB0703.htm
Here is full schematic in pdf format:
http://www.auelectronics.selfip.com/CB0703_PICKit2_Schematic.pdf
PICkit-2/CB0703 SMD PCB
PICkit 2 SMD Assembly drawing:
PICKit2 with usb type-B interface.
PICkit 2 Working with MPLAB V7.62 (highlighted text show the CB0703RevA)
Now with MPLAB V7.62 and V8.0, PICkit2 supports IN-Circuit-Debugging.
Dimenstion: 2.84" by 1.26"(about 72mm by 32 mm) (red highlight shows the external power supply)
Connectors (USB mini-B, RJ12 ICSP, Power jactet)
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coolcat
Joined: 20 Dec 2006
Posts: 14
Helped: 2
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| 30 Jan 2008 8:41 Re: GTP USB schematic ? |
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| has any one success build a GTP programmer?
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