USB device not recognized

Discussion created by lpcware Employee on Jun 15, 2016
Latest reply on Jun 15, 2016 by lpcware
Content originally posted in LPCWare by burt on Thu Jun 02 17:39:48 MST 2011
I got some USB device code from the rdb1768 USBstack and got it to run on my code red rdb1768 board.  I ported it over to my lpc1754 board with an mcu change to lpc1754 and I get USB device not recognized.  Other aspects of my code appear to work, just the USB does not.

In stepping through both codes, the rdb1768 reads the EP_SLOW bit from the USBDevIntSt reg when it connects to the USB bus but my lpc1754 board has the EP_SLOW bit '0' with the same operation.  This difference appears to cause a problem in the USB interrupt handler routine.  All the prior USB operations appear to manipulate the identical data.

Any insight as to what's causing this is appreciated.