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The previous snipset |
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Auto detecting the IRQ's of your COM ports / UART IRQ
Detection How does it work? The program works by initializing all the
UART's in the system. In a next phase it will flip the OUT2-bit of the Modem
Control Register per COM. Flipping this bit will trigger an IRQ. Because the
program took control of all interrupts, it knows exactly which IRQ belongs
to which UART. The code... I've tested the code on different systems and it worked. You should take care of the fact that some hardware devices (mouse, CDROM, ...) may trigger an IRQ while the program is executing, thus resulting in incorrect results. It's recommended that you know about programming the UART and IRQ's. If
that's not the case, I don't think you will understand what is going on. But
please... try!
This program will not be able to detect the IRQ's of PCI add-on cards because they have an interrupt mechanism of their own. Therefor this piece of code will only work with ISA/EISA related UART cards.
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The previous snipset |