On Oct 15, [EMAIL PROTECTED] wrote:
> Hello. I'm sorry to disturb you but.. I have read manuals, searched web, fed the
> ducks (evil ones), but I can not figure out some things.
>
> 1:
> I have an isa card with i/o address 0x300-0x301. No dma, no irq - just i/o.
> How can I read/write from/to this address to program the card?
> Card is a HardSID and it is pc implementation of famous Commodore 64 synthesizer
> chip so actually I want to program that chip, not just _any_ card :)
>
> I'm under an impression that there is no way to write directly to ports (like in
> dos) and that I should write a device driver. Or is there already some generic i/o
> driver? After intensive reading of manuals, it is still unclear to me what this
> driver should do and what the drivers usually do.
>
> I mean, what services do drivers offer? What services they _need_ to offer? Do they
> just create appropriate device nodes and let the applications to worry about using
> them or do they do some data manipulation or do they offer routines and interfaces
> for applications or what? What should this particular driver do as I just want to
> read/write data.
>
I'm not positive about this but I think that you can do it
from usermode by opening /dev/io (as root) and the use inb, outb
macros defined in cpufunc.h.
> 2:
> Also, there is an OPL3 synthesizer chip in older Sound Blasters and compatibles. Man
> pages say this chip is supported. I just wonder, how it is supported? How do I
> read/write from/to this chip if I know i/o address of it? Yes I'm stupid but please,
> little bit of mercy?
>
The current midi drivers in FreeBSD are dated, I've seen some
of it work but never synth chips like opl. See sys/dev/sound/isa/opl.c
If you want to read/write to it from usermode skipping the
driver, see #1.
> 3:
> Then, there is /dev/midi and /dev/sequencer. If I want to read incoming midi data I
> read /dev/midi right? When do I want to read /dev/sequencer?
>
If you *have* a /dev/midi that works (unlikely), yes you can
read it. You will get a raw stream directly from the external device.
/dev/sequencer gives processed packets (optionally) including timing
information. /dev/sequencer has been obseleted by /dev/music.
--Mat
--
We peer so suspiciously at each other that we cannot see
that we Canadians are standing on the mountaintop of human
wealth, freedom and privilege.
- Pierre Elliott Trudeau
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