Hello, I'm using an xxxxxx kit and have the USB to dual-virtual com port software running on the LPC2148. The host driver (PLP2KUS.inf) works perfectly on Windows XP, but unfortunately my laptop has Vista 64 bit and it won't accept any of the drivers i found. I already disabled the digital certificate control on the OS(vista x64 won't let u install drivers with no digital signature)so that shoudn't be the problem. I tried to install drivers for xp/2k, tried to modify them with info found on the internet, modified them with the include=mdmcpq.inf found on this forum, asked your distributor (Tecnologix, Italy) for the latest upgrades but still Vista cannot install drivers and i see the Hardware as a double PHILIPS LPC2148 VCOM icon in Hardware management prompt. Any suggestions??? Thank you in advance for help
It's quite reasonable that the two reset bits clears themselves. After all, the datasheet says that the bits are self-clearing, so you do not need to write a second time to this register, to clear the bits.
It's a bit interesting that it switches from 1-ch rx FIFO to 14-ch FIFO.
On the other hand, the datasheet does say "Table 344. UARTn FIFO Control Register (U0FCR - address 0xE000 C008, U2FCR - 0xE007 8008, U3FCR - 0xE007 C008, Write Only) bit description"
Since it is a write-only register, the datasheet doesn't really tell what the Keil debugger should return if you read from this address - any read results should after all be seen as undefinied.
Was that reply meant for this thread: http://www.keil.com/forum/docs/thread14891.asp ?
Yes, most definitely so.
Windows XP (as do its predecessors) has an horrific record of support for USB, particularly composite devices (try combining a MSC and a CDC. Ho, yeah). This problem does not surprise me at all.