usb

Can somebody give me resources on how to develop a serial to usb
device? I'm not allowed to use rs232 to usb ICs so I have to develop my
own!

Already have the USB specification.

Thanks

On 1 Jul 2006 18:35:30 -0700, "eugene" <pebrian27@yahoo.com> wrote:

>Can somebody give me resources on how to develop a serial to usb
>device? I'm not allowed to use rs232 to usb ICs so I have to develop my
>own!
>
>Already have the USB specification.

Get Jan Axelson's book, "USB Complete" and check out the resources on her
website, www.lvr.com.


Robert Scott
Ypsilanti, Michigan

On 1 Jul 2006 18:35:30 -0700, "eugene" <pebrian27@yahoo.com> wrote:

>Can somebody give me resources on how to develop a serial to usb
>device? I'm not allowed to use rs232 to usb ICs so I have to develop my
>own!
>
>Already have the USB specification.
>
>Thanks

Use a PIC18F2450
(http://ww1.microchip.com/downloads/en/DeviceDoc/39760a.pdf), which has USB
and a hardware UART, and get Microchip Application Note AN956
(http://ww1.microchip.com/downloads/en/AppNotes/00956b.pdf) and the software
for this AN
(http://ww1.microchip.com/downloads/en/AppNotes/CDC_RS232_Emulation.EXE).
This gives you a working USB CDC communication layer, so most of the work is
already done. PC drivers for CDC standard devices are already included in
W2k/XP, so you won't have to worry about Windows kernel mode programming
either.

You will need MPLAB (free,
http://ww1.microchip.com/downloads/en/DeviceDoc/mp740_full.zip), the ICD2
ISP programming/debugging interface (about 150$,
http://www.microchip.com/stellent/idcplg?IdcService=SS_GET_PAGE&nodeId=1406&dDocName=en010046&part=DV164005),
and the Microchip C18 C compiler (about 300$, maybe the Student Edition is
enough:
http://ww1.microchip.com/downloads/en/DeviceDoc/MPLAB-C18-Student-Edition-doc-v3_02.exe)
for this task. Maybe the PCDEM USB starter board
(http://www.microchip.com/stellent/idcplg?IdcService=SS_GET_PAGE&nodeId=1406&dDocName=en021940&part=DM163025)
is helpful for the first steps.


Mit freundlichen Gr&#4294967295;&#4294967295;en

Frank-Christian Kr&#4294967295;gel