Re: TTL/USB converter usage question

[Ramiro Aceves <ea1abz%gmail.com@localhost>]

El mar, 15 oct 2024 a las 7:53, RVP (<rvp%sdf.org@localhost>) escribió:
>
> On Mon, 14 Oct 2024, Ramiro Aceves wrote:
>
> > netbsd-raspa4$ { sleep 1; stty -f /dev/ttyU0 ... ; } & cat /dev/ttyU0
> > stty: /dev/ttyU0: Resource temporarily unavailable
> > ^C
> >
>
> That `...' == fill-in-the-blanks :)
>
> > netbsd-raspa4$ { sleep 1; stty -f /dev/ttyU0 9600 raw clocal cread -crtscts; } & cat /dev/ttyU0
> > stty: /dev/ttyU0: Resource temporarily unavailable
> > ^C
> >
>
> Can you try the dial-out device?
>
> { sleep 1; stty -f /dev/dtyU0 9600 raw clocal cread -crtscts; } & cat /dev/dtyU0
>
> kre@'s should also work with this, I think.


Hello RVP, I really appreciate your effort in finding the truth here
(also the others).

netbsd-raspa4$ { sleep 1; stty -f /dev/dtyU0 9600 raw clocal cread
-crtscts; } & cat /dev/dtyU0
netbsd-raspa4$   nothing.......

netbsd-raspa4$ (stty 9600 raw; cat) </dev/dtyU0
netbsd-raspa4$ nothing...

cu command seems to work also with /dev/dtyU0 device:

netbsd-raspa4$ cu -l /dev/dtyU0 -s 9066 |hexdump -C > message

~~. (to stop cu command)

netbsd-raspa4$ cat message
00000000  43 6f 6e 6e 65 63 74 65  64 0d 0a 40 40 45 e1 8a  |Connected..@@E..|
00000010  8d 87 e8 0c 8c 81 80 00  00 00 08 b1 53 8b ff 35  |............S..5|
00000020  fb a5 00 01 3d 1a 00 00  00 00 00 00 80 80 80 80  |....=...........|
00000030  80 80 80 80 80 80 80 80  80 80 80 80 80 80 80 80  |................|
*
00000050  80 80 80 ca d4 8d 0a 40  40 45 61 0a 0d 07 e8 0c  |.......@@Ea.....|
00000060  0c 03 00 00 00 00 08 b1  d3 8b ff b5 fb a5 80 81  |................|
00000070  bd 9a 80 80 80 80 80 80  80 80 80 80 80 80 80 80  |................|
00000080  80 80 80 80 80 80 80 80  80 80 80 80 80 80 80 80  |................|
00000090  80 00 00 00 00 80 80 80  80 80 80 80 80 00 00 ca  |................|
000000a0  56 0d 0a 40 40 c5 e1 8a  8d 87 e8 8c 8c 85 00 00  |V..@@...........|
000000b0  00 00 08 b1 53 8b ff 35  fb a5 00 01 3d 1a 00 00  |....S..5....=...|
000000c0  00 00 00 00 00 00 00 00  00 00 00 80 80 80 80 80  |................|
000000d0  80 80 80 80 80 80 80 80  80 00 00 00 00 00 80 00  |................|
000000e0  00 00 00 80 80 00 80 80  00 80 00 4a 50 0d 0a 40  |...........JP..@|
000000f0  40 45 61 0a 0d 07 e8 0c  0c 07 00 00 00 00 08 b1  |@Ea.............|
00000100  53 8b ff 35 fb a5 80 81  bd 9a 80 80 80 80 80 00  |S..5............|
00000110  80 80 80 80 80 80 80 00  80 00 00 00 00 00 00 00  |................|
00000120  00 00 00 00 00 00 00 00  00 00 00 80 00 80 00 00  |................|
00000130  00 00 00 00 00 00 00 4a  d2 0d 0a 7e 0d 0a 5b 45  |.......J...~..[E|
00000140  4f 54 5d 0d 0a                                    |OT]..|
00000145

Thanks.


>
> After reading tty(4), I see that there's a difference between ttyU0 and dtyU0,
> (as a Linux guy, all this is a bit obscure...), and maybe we should've been
> using the dial-out device all along.
>
> HTH,
>
> -RVP