Need to use same files and functions for 2 set of hardware (Same hardware)

[test_man]

I have 1 set of files. library.c and library.h.

This files have code to communicate to a device via serial port. This code works fine if I have 1 device attached to my serial port.

library.c file has mutithreading functions and can communicate to only 1 device at a time.

I need to communicate to 2 of these devices simultenously using 2 serial ports. My problem is I have to use same function to communicate with different devices and I don't have mechanism to identify them.

For example:

I have function like send_message. How do I use this function to communicate to 2 different devices? Can I create dll from my code and use 1 set as dll and other set as .c and .h?

[jr_2005]

The usual approach in these situations is to include an extra parameter which identifies the correct hardware. So for example instead of:

    send_message ("A message for the serial port\n");

you could use:

    send_message (port_1, "A message for serial port 1 only\n");

where port_1 is used to select which hardware the function talks to. The CVI RS232 routines need this information anyway, so you just need to use a local variable instead of the port number being fixed.

JR