1. RE: unbuffered getc() ?
Did you try get_key() and/or wait_key()?
-- Brian
chris wrote:
>
> Hi,
> I am using Euphoria (2.4 alpha) in Linux to interface with a serial LCD
> screen and keypad. Sending output is no problem (once I'd remembered to
> use
> flush() ) but I'm having trouble reading from the keypad. I tried
> something
> like the following:
>
> integer lcd, key
>
> lcd=open("/dev/ttyS1","ub")
> while 1 do
> puts(lcd,{#FE,#26})
> -- this tells the device to return the contents of its key buffer, or if
> the
> -- buffer is empty, to return 0x00
> flush(lcd)
> key=getc(lcd) --just locks up here!
> print(1,key)
> end while
>
> This doesn't work because according to the Euphoria docs:
>
> "File input using getc() is buffered, i.e. getc() does not actually go
> out
> to the disk for each character. Instead, a large block of characters
> will be
> read in at one time and returned to you one by one from a memory buffer.
> When getc() reads from the keyboard, it will not see any characters
> until
> the user presses Enter. Note that the user can type control-Z, which the
> operating system treats as "end of file". -1 will be returned. "
>
> So it seems that getc() won't return anything until Euphoria sees a line
> feed or an EOF. So my question (if you've read this far): how can I get
> a
> Euphoria program to read a single byte, immediately and without dealing
> with
> buffers, from a file descriptor. Is there a standard C function I can
> easily wrap? (I'm not very good with C)
>
> I hope that made some sort of sense,
> chris.
>
>
2. RE: unbuffered getc() ?
Oops... nevermind. I guess you can't specify a device with those.
Brian Broker wrote:
>
> Did you try get_key() and/or wait_key()?
>
> -- Brian
>
> chris wrote:
> >
> > Hi,
> > I am using Euphoria (2.4 alpha) in Linux to interface with a serial LCD
> > screen and keypad. Sending output is no problem (once I'd remembered to
> >
> > use
> > flush() ) but I'm having trouble reading from the keypad. I tried
> > something
> > like the following:
> >
> > integer lcd, key
> >
> > lcd=open("/dev/ttyS1","ub")
> > while 1 do
> > puts(lcd,{#FE,#26})
> > -- this tells the device to return the contents of its key buffer, or if
> >
> > the
> > -- buffer is empty, to return 0x00
> > flush(lcd)
> > key=getc(lcd) --just locks up here!
> > print(1,key)
> > end while
> >
> > This doesn't work because according to the Euphoria docs:
> >
> > "File input using getc() is buffered, i.e. getc() does not actually go
> > out
> > to the disk for each character. Instead, a large block of characters
> > will be
> > read in at one time and returned to you one by one from a memory buffer.
> > When getc() reads from the keyboard, it will not see any characters
> > until
> > the user presses Enter. Note that the user can type control-Z, which the
> > operating system treats as "end of file". -1 will be returned. "
> >
> > So it seems that getc() won't return anything until Euphoria sees a line
> > feed or an EOF. So my question (if you've read this far): how can I get
> >
> > a
> > Euphoria program to read a single byte, immediately and without dealing
> > with
> > buffers, from a file descriptor. Is there a standard C function I can
> > easily wrap? (I'm not very good with C)
> >
> > I hope that made some sort of sense,
> > chris.
> >
> >
