SparkFun Forums

[spacewrench]

Sorry for the delay in replying -- I only have a few hours each week to hack even under the best of circumstances, and sometimes I'm too busy to do anything fun at all.

Is there any other circuitry on P0.23 or EXT1-24?

The circuit diagram above shows everything as far as I know.

Have you found any references that describe using the 2148 USB target? The User's Manual lists all the registers, of course, but it doesn't provide much help for getting a complete program running. I'd guess an Application Note-style document would be more useful.

[After poking around the Philips website some more...]
Here we go: How To Make a Virtual COM Port Driver Using 2148 USB

[bertrik]

The USB controller in the LPC214x is very similar (though not identical) to the "D12", or PDIUSBD12 USB device controller. Knowing this helped a lot. There is a lot of sample code and documentation available for the D12.

For your board, getting the LED to light when the device is connected to a PC is an essential first step. It could be that there is still some missing default configuration, so perhaps it's a good idea to do a complete powerdown/powerup of the USB controller during init.