PCI card with UARTs

NTDEV
1

Hi all,

Could someone please to make more clear next 2 questions:

I have PCI card with 2 UARTs( 8 serial interfaces - ComA, ComB,…,ComH).

1). How can I handle access to ComA,…,ComH in PCI driver (PLX chip)?

2). How I can get access to ComA,…,ComH from user level application?

Thanks,

Andrey

2

For Driver, you have to get the datasheet of UART and learn how to control UART first. Then you have to know the I/O address of each UART(assigned by BIOS) so you can control it in your driver.

For Application, please install SDK first. Please refer to http://msdn2.microsoft.com/en-us/library/ms810467.aspx for more information.

3

1). How can I handle access to ComA,…,ComH in PCI driver (PLX chip)? I would asume of course you have a driver for this PCI card. If you do not have a driver for this card you will need to write one. In writing a driver I would consider the serial drivers in the DDK either the KMDF / UMDF or the kernel sample. You will have to vary this driver to support the multiple UARTS. This will require info on which IRQs / IO ports are used with the card.

Now if I read the question as you wish to call these ports from within another driver you will have to get the Device Object and then send our IRPs to it. See: IoGetDeviceObjectPointer(), IoBuildDeviceIoControlRequest() for thing like setting line parameters, etc, and IoBuildSynchronousFsdRequest().

2). How I can get access to ComA,…,ComH from user level application. Use HyperTerminal and connect two your serial ports with a null modem cable. You can search the internet for sample win32 communication applications with source. You could use an old dos program that virtualizes - traps on the UART access and translates this to a com VVD application. Again connect the RS-232 ports with a null modem cable.

-W. M. Jones