Hi Denis,
Thanks for your reaction.
In <termios.h> the same baudrates as in your post are mentioned. However,
after googling about the topic I'm now investigating in the ioctl()
function. For the moment I have this in my code:
/*
* XpressNetInterface.cpp
*
* Created on: Oct 9, 2017
* Author: paul
*/
#include "XpressNetInterface.h"
#include <sys/epoll.h>
#include <sys/eventfd.h>
#include <sys/ioctl.h>
#include <fcntl.h>
#include <unistd.h>
//#include <termios.h>
#include <asm/termbits.h>
namespace DCC_V3
{
...
XpressNetInterface::XpressNetInterface(const char* pDevice)
: m_pDevice(pDevice)
{
struct termios2 settings;
m_fdSerial = open(m_pDevice.c_str(), O_RDWR | O_NOCTTY);
if(m_fdSerial < 0)
{
// TODO Daemon has no terminals, use syslog
perror("open");
}
int r = ioctl(m_fdSerial, TCGETS2, &settings);
if(r)
{
perror("ioctl");
}
settings.c_ispeed = settings.c_ospeed = 62500;
settings.c_cflag &= ~CBAUD;
settings.c_cflag |= BOTHER;
r = ioctl(m_fdSerial, TCSETS2, &settings);
if(r)
{
perror("ioctl");
}
m_fdStop = eventfd(0, 0);
m_thread = thread([this]
{
threadFunc();
});
}
...
}
This compiles without errors or warnings. But before I can test it I have
to investigate in the "never ending story of device tree overlays".
BTW I cannot use one of the PRUSS processors because they are both used for
other purposes.
Op dinsdag 10 oktober 2017 19:13:30 UTC+2 schreef Dennis Lee Bieber:
>
> On Tue, 10 Oct 2017 09:04:48 -0700 (PDT), Paul Van den Bergh
> <[email protected] <javascript:>> declaimed the
> following:
>
> >Hi all,
> >
> >I'm implementing an interface to a commercial product that communicates
> >over an asynchronous interface at 62500 Baud. Looking at the <termios.h>
> >files on the BBB I cannot find this setting. Is it at all possible to
> set
> >up a u(s)art to communicate at this speed? Is it possible with ioctl()?
>
> >Where can I find more info on the later ?
> >
> The TI Technical Reference Manual for the SoC used by the BBB.
> (Page
> 4320 of SPRUH73P http://www.ti.com/lit/ug/spruh73p/spruh73p.pdf
>
> Baud rate Over sampling Divisor Error (%)
> 300 16 10000
> 0
>
> 600 16 5000
> 0
>
> 1200 16 2500 0
>
> 2400 16 1250 0
>
> 4800 16 625
> 0
>
> 9600 16 313
> 0.16
>
> 14400 16 208
> 0.16
>
> 19200 16 156
> 0.16
>
> 28800 16 104
> 0.16
>
> 38400 16 78
> 0.16
>
> 57600 16 52
> 0.16
>
> 115200 16 26
> 0.16
>
> 230400 16 13
> 0.16
>
> 460800 13 8
> 0.16
>
> 921600 13 4
> 0.16
>
> 1843200 13 2
> 0.16
>
> 3000000 16 1
> 0
>
> 3686400 13 1
> 0.16
>
>
>
> No 62500... No MIDI 31250 either <G>
>
> It might be possible to program one of the PRUs to emulate a UART
> at
> the needed speed. (Unless I stuffed a few too many zeros in it, I'm coming
> up with over 3000 PRU instructions per bit <G>)
> --
> Wulfraed Dennis Lee Bieber AF6VN
> [email protected] <javascript:> HTTP://wlfraed.home.netcom.com/
>
>
--
For more options, visit http://beagleboard.org/discuss
---
You received this message because you are subscribed to the Google Groups
"BeagleBoard" group.
To unsubscribe from this group and stop receiving emails from it, send an email
to [email protected].
To view this discussion on the web visit
https://groups.google.com/d/msgid/beagleboard/8e489e71-873f-4eb2-9b9f-6e30ecbb1102%40googlegroups.com.
For more options, visit https://groups.google.com/d/optout.
