[GreenKeys] Teletype 32-ASR / Arduino vs Raspberry Pi

[tony.podrasky]

GA OMs;

Eric, that's not quite correct:

The kernel doesn't have to know anything about Baud. The UAR/T
is the one that handles stuff like that.

Do a <man setserial>. You can tell the UAR/T to do pretty much
any speed you like.

Here's a few entries from my RTTY program:

[These are near the beginning of the program]

system("/bin/setserial /dev/ttyS0 spd_cust divisor 2534");

system("/bin/stty -F /dev/ttyS0 38400 cs5 raw -cstopb -echo");


[These are from inside the program where I can change the speed
on the fly]


if (strcmp(command, sixty) == 0) /* | if input = sixty, set port speed | */
                     {                                           /* | to 
60 WPM.                       | */
                     printf("\n[ESCAPE SEQUENCE SIXTY ACK]\n");
                     system("/bin/setserial /dev/ttyS0 spd_cust divisor 
2534");
                     }

if (strcmp(command, sixtysix) == 0)             /* | if input = 
sixtysix, set port    | */
                     {                                           /* | 
speed to 66 WPM.                 | */
                     printf("\n[ESCAPE SEQUENCE SIXTYSIX ACK]\n");
                     system("/bin/setserial /dev/ttyS0 spd_cust divisor 
2304");
                     }

if (strcmp(command, hundred) == 0)              /* | if input = hundred, 
set port     | */
                     {                                           /* | 
speed to 100 WPM.                | */
                     printf("\n[ESCAPE SEQUENCE HUNDRED ACK]\n");
                     system("/bin/setserial /dev/ttyS0 spd_cust divisor 
1536");
                     }


(I hope that it legible: this version of Thunderbird has an automatic
line wrap that I can't change but the outgoing e-mail doesn't have it).

UE,
W6ESE - tony
NNNN
ZCZC

On 06/11/2013 02:47 PM, epvgk at limpoc.com wrote:
> Oh, I guess I should mention that the linux kernel doesn't support or know anything
> about the 45.45 baud speed; I think had to modify the linux kernel to allow the speed,
> but the hardware is capable of generating that baud rate.
>
> eric

-- 
Tony J. Podrasky | I've been thinking about all my cool electronic
                  | gadgets and how they've never brought me any real
                  | happiness. I guess it's because I don't have
                  | enough of them.                   -Matt Diamond