[En-Nut-Discussion] Debug device input feature added

[Pavel Chromy]

Hi All,

I have added unbuffered input to devDebug0.
It is simple, not interrupt driver, it just yields the cpu when waiting for a character
(eats cpu a bit), but provides wint an easy way of controlling your application when debugging.

Since it does not use an interrupt, buffer overruns may occur, which should not be a big deal,
since the other end of the serial line is typically connected to a device
with low character rate during debugging - a mean human interface device ;-)

Also ioctl call UART_GETSTATUS which can return UART_RXBUFFEREMPTY was also added,
which may be used to ensure whether a character was received and read from the debug device
only if it really was.

Anyone interrested? I propose this to be added to the CVS - I think it is pretty usefull,
at least it was for me.

Note: the same changes might be applicable also to devDebug1.

-- 
#define QUESTION ((bb)||!(bb))

Mgr. Pavel Chromy
ASIX s.r.o.
Staropramenna 4
150 00 Praha 5