Usb <-> Rs485 - Page 2 - Electronic Circuits Projects Diagrams Free

blueroomelectronics · 19th May 2008, 01:35 AM

Quote:

Originally Posted by Ubergeek63

Try writing to a thumb drive with a 4550...

Can't do it with an FT232 either.

Ubergeek63 · 19th May 2008, 01:36 AM

Quote:

Originally Posted by blueroomelectronics

I'm not a fan of soldering SOIC and such myself, the best solution I've found is the Schmartboard system. Soldered a TQFP with it just fine.

What size? I did a 100 pin 0.5mm pitch by hand...not fun. Worse still was modding a board by lifting and soldering to two adjacent pins on that thing!

blueroomelectronics · 19th May 2008, 01:40 AM

0.5mm, easy with the Schmartboard.

Ubergeek63 · 19th May 2008, 01:50 AM

Quote:

Originally Posted by blueroomelectronics

0.5mm, easy with the Schmartboard.

Actually I was soldering to a custom PCB I had designed. I have never heard of Schmartboard, curious that it is actually reasonably priced. I do not, off hand, see the difference between the "old" and the "EZ".

Kryten · 19th May 2008, 07:16 AM

Bill where on Xiaofans site did you see the emulator.

Im really going to make it for a buddy, cous the factosy made stuff are really expensive (beeing a student and all)

Kryten · 19th May 2008, 07:18 AM

Yeh one other thing to ask:

Would it be possible to make a ICD2 for USB using a 18F4550 ( or similar pic with USB)?

Ubergeek63 · 19th May 2008, 10:08 AM

Quote:

Originally Posted by blueroomelectronics

Can't do it with an FT232 either.

Missed this one yesterday...true enough, but for $11 for the VNC1 instead of $6 for the FT232 you can.

petrv · 19th May 2008, 10:33 AM

SOICs are not that bad, but take SSOP or TSSOP or even the fine-pitch QFP (0.5mm) - but I did that as well (TSSOP) - just use a lot of flux and not too much solder and it will be ok.

USB host controller and PIC - there is very new MCU from Microchip supporting USB 2.0 OTG (quite late, Atmel has such MCU for a long time).

Try look at PIC24FJ64GB106 to PIC24FJ256GB110 family.

Ubergeek63 · 19th May 2008, 10:52 AM

looks like you MIGHT be able to drive a printer with that one. (today's printers are notorious for offloading processing onto the host driver software) I do not, however, see mass storage support: only a comment about minimal host funtionality.

arhi · 19th May 2008, 11:11 AM

Quote:

Originally Posted by Kryten

Would it be possible to make a ICD2 for USB using a 18F4550 ( or similar pic with USB)?

I tried .. I recompiled the bootloader for 18F4550 (actually, in MLAB just changed device to 18F4550 and click on build), I then programmed the bootloader to easyPic4 board, connected it to the eth, started pickit2 app, it said I need firmware, it downloaded firmware from the net and uploaded it to the easypic4 18f4550 .. I tried using few options and it "works" .. the rs232 works, the "logic probe" works (I just had to short few pins on port A I think (not sure) .. but, basically, I just recompiled bootloader, and the firmware for 18F2550 worked .. I do not know how compatible those 2 are, and if debugging would actually work, but "initial trial" went nice

arhi · 19th May 2008, 11:13 AM

Quote:

Originally Posted by Ubergeek63

Missed this one yesterday...true enough, but for $11 for the VNC1 instead of $6 for the FT232 you can.

ah, can you please point out to the VNC1 datasheet, I have never heard about it

and google just presented bunch of vnc application clones

Ubergeek63 · 19th May 2008, 12:53 PM

http://www.vinculum.com/documents/da...S_VNC1L-1A.pdf

Available through Mouser

blueroomelectronics · 19th May 2008, 02:53 PM

Quote:

Originally Posted by Kryten

Yeh one other thing to ask:

Would it be possible to make a ICD2 for USB using a 18F4550 ( or similar pic with USB)?

You can but you also need the 16F877 part. See my Unicorn and Inchworm+ combo. That's how it's done. You can build the PICkit2 with just a 18F4550, much better for most things than the ICD2 anyway (unless you're into dsPICs)

The PICkit2 to RS232 stuff can be found here
PICKit 2 as an Alternative to PICDEM FS USB to Learn USB

Kryten · 19th May 2008, 03:48 PM

So you cant eliminate the 16fXXX for ICD2. I mean arent the 18F4550 bigenought to handel both the ICD2 task as well as doing programming? Or will you simply use the 18F4550 as a USB <-> RS232 adaptor?

blueroomelectronics · 19th May 2008, 04:04 PM

Quote:

Originally Posted by Kryten

So you cant eliminate the 16fXXX for ICD2. I mean arent the 18F4550 bigenought to handel both the ICD2 task as well as doing programming? Or will you simply use the 18F4550 as a USB <-> RS232 adaptor?

Nope you need both, it's an older design and the 18F4550 was brought in to replace the Cypress USB IC that was discontinued.

What's wrong with the PICkit2 ? for the PICs it supports and that's plenty it's as fast as the ICD2, programs, debugs, logic analyzer, UART tool...

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19th May 2008, 01:40 AM	(permalink)
blueroomelectronics	0.5mm, easy with the Schmartboard. __________________ Bill Smart Kits build Smart People http://www.blueroomelectronics.com

19th May 2008, 07:16 AM	(permalink)
Kryten	Bill where on Xiaofans site did you see the emulator. Im really going to make it for a buddy, cous the factosy made stuff are really expensive (beeing a student and all) __________________ Simplicity rules Good enought - its perfect ?? 2 Gig of free online backup space Are you a Chemist?

19th May 2008, 07:18 AM	(permalink)
Kryten	Yeh one other thing to ask: Would it be possible to make a ICD2 for USB using a 18F4550 ( or similar pic with USB)? __________________ Simplicity rules Good enought - its perfect ?? 2 Gig of free online backup space Are you a Chemist?

19th May 2008, 10:33 AM	(permalink)
petrv	SOICs are not that bad, but take SSOP or TSSOP or even the fine-pitch QFP (0.5mm) - but I did that as well (TSSOP) - just use a lot of flux and not too much solder and it will be ok. USB host controller and PIC - there is very new MCU from Microchip supporting USB 2.0 OTG (quite late, Atmel has such MCU for a long time). Try look at PIC24FJ64GB106 to PIC24FJ256GB110 family. Last edited by petrv; 19th May 2008 at 11:05 AM.

19th May 2008, 10:52 AM	(permalink)
Ubergeek63	looks like you MIGHT be able to drive a printer with that one. (today's printers are notorious for offloading processing onto the host driver software) I do not, however, see mass storage support: only a comment about minimal host funtionality.

19th May 2008, 12:53 PM	(permalink)
Ubergeek63	http://www.vinculum.com/documents/da...S_VNC1L-1A.pdf Available through Mouser

19th May 2008, 03:48 PM	(permalink)
Kryten	So you cant eliminate the 16fXXX for ICD2. I mean arent the 18F4550 bigenought to handel both the ICD2 task as well as doing programming? Or will you simply use the 18F4550 as a USB <-> RS232 adaptor? __________________ Simplicity rules Good enought - its perfect ?? 2 Gig of free online backup space Are you a Chemist?