Lpc2000

Hi Eugene,

> Hello all,
> I am new to this group and to the LPC chips in general.
> I have been working on implementing an USB device using LPC2148.
> 
> When the chip read in packets of data from the host PC, occasionally,
> a byte goes missing. I checked the data packets over an USB analyzer,
> and they appeared to be perfect. So the data got corrupted somewhere
> between acknowledging the data packet and reading the data from the
> USB endpoint RAM.
> 
> It might be of interest to you that I used a modified USB stack from
> the virtual com port example from phillip's website. The example was
> written for Keil, but it was ported to IAR workbench.
> 
> Sometimes the chip also hangs after writing a command to usb protocol
> engine, when it waits for CCEMTY to be set.


Since you're working with IAR, be sure to take a look at the MSD example
project.  

It can be found here:
<install drive>\Program Files\IAR Systems\Embedded Workbench
4.0\arm\src\examples\Philips\LPC214x\MassStorage_USB_LPC2148

It is a major revision to IAR's HID example, and a good starting point for
writing LPC2148 device code. 


Joel