Re: [MiNT] sleep() and wake() in device drivers

[Johnathon Oddie <oddie@flatirons.org>]

Hello again,

> 
> > There are actually a couple more points about which I am not sure...
> > (ok, so I was wrong when I said I thought I had figured out most of it ;)
> > - does the .xdd need to initialize any fields of the `struct tty'
> >  whose pointer it stores in f->devinfo and the dev_descr struct?
> 
> No.
> 
> > - the tty devices in the kernel seem to do their `normal' io  in units of 4
> >  bytes of which only the last is significant; is this true also for external
> >  tty drivers? 
> 
> Yes.
> 
> >  It seems not to be true from what tests I have done, i.e. ser_write() reports 
> >  that bytes is equal to the number which my little test program passes to 
> >  write()
> 
> Which ser_write() do you mean?
ser_write() is the write 'service function' provided by my device driver
(one of the functions in the DEVDRV struct), sorry I didn't make that clear.
I've had it print out its `bytes' parameter on the console, and it printed
the same number that the test program passes to MiNTLib's write(). Apparently
I've done something wrong somewhere else... :(
> 
> Best you take a look on my serial drivers (uart, scc). They are tty
> drivers.

Thank you, that will probably make it a lot clearer to me.

Jonathan