I want to hack my com interface to specail purpose. I want to use the Modem Status Register. When the high 4 bits change, it could spring an interrupt. So, I set the Intertupt Enable Register(in sioattach fuction) to the interrupt, which support changing in the state of the modem input pins(IER_EMSC). I set the MSR successfully.
But when the MSR state change, the siointr print anything(I add a printf as the first line of the function). I found there are 4 level interrupt(IIR). I want to set the IIR 4 level to support Modem status. But I couldn't set the Interrupt Identification Register, why?
the code of set IIR is in the sioattach function:
sio_setreg(com, com_iir, IIR_MLSC);
I found the com_iir content is not changed.
How can I do that? My OS is FreeBSD4.8-Release.
Thanks a lot!
Best Regards Ouyang Kai
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