Re: [beagleboard] UART communication in Beaglebone Black
I believe it can be now since v3.19.x but we don't know the kernel version
he's using so all we can do is guess :(.
There's a recent thread here with some links with instructions on how to
set it up so perhaps the OP can give that a go :thumbup:.
On Sunday, May 17, 2015 at 8:35:45 AM UTC+1, Davide Picchi wrote:
Are you sure, that you selected the right UART port???
It should be
/dev/ttyO0
or
/dev/ttyO1
and so on...but not
/dev/ttySx
On Tuesday, April 28, 2015 at 9:19:31 PM UTC+2, Peter Hurley wrote:
On 04/27/2015 06:41 AM, JAY KOTHARI wrote:
Hi,
I am unable to do simple uart communication in BBB. I have set
device tree
uart2_pins: uart2_pins {
pinctrl-single,pins =
0x154 0x01
0x150 0x31
;
};
uart2 {
status = okay;
pinctrl-names = default;
pinctrl-0 = uart2_pins;
};
then I configure the UART Port
stty -F /dev/ttys0 cstopb -evenp ispeed 115200
^
stty: /dev/ttys0: No such file or directory
uart2 is not /dev/ttyS0.
uart0 = /dev/ttyS0
uart1 = /dev/ttyS1
uart2 = /dev/ttyS2
Regards,
Peter Hurley
Then I made a user space application for reading and writing data to
device file. I have attached the application program
I connected Tx and Rx pin in same BBB.(Loop back mode)
But I am not able to do simple UART communication in loop back
mode. Do am I missing something? Please help me
--
For more options, visit http://beagleboard.org/discuss
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Re: [beagleboard] UART communication in Beaglebone Black
Are you sure, that you selected the right UART port???
It should be
/dev/ttyO0
or
/dev/ttyO1
and so on...but not
/dev/ttySx
On Tuesday, April 28, 2015 at 9:19:31 PM UTC+2, Peter Hurley wrote:
On 04/27/2015 06:41 AM, JAY KOTHARI wrote:
Hi,
I am unable to do simple uart communication in BBB. I have set
device tree
uart2_pins: uart2_pins {
pinctrl-single,pins =
0x154 0x01
0x150 0x31
;
};
uart2 {
status = okay;
pinctrl-names = default;
pinctrl-0 = uart2_pins;
};
then I configure the UART Port
stty -F /dev/ttys0 cstopb -evenp ispeed 115200
^
stty: /dev/ttys0: No such file or directory
uart2 is not /dev/ttyS0.
uart0 = /dev/ttyS0
uart1 = /dev/ttyS1
uart2 = /dev/ttyS2
Regards,
Peter Hurley
Then I made a user space application for reading and writing data to
device file. I have attached the application program
I connected Tx and Rx pin in same BBB.(Loop back mode)
But I am not able to do simple UART communication in loop back
mode. Do am I missing something? Please help me
--
For more options, visit http://beagleboard.org/discuss
---
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Re: [beagleboard] UART communication in Beaglebone Black
On 04/27/2015 06:41 AM, JAY KOTHARI wrote:
Hi,
I am unable to do simple uart communication in BBB. I have set device tree
uart2_pins: uart2_pins {
pinctrl-single,pins =
0x154 0x01
0x150 0x31
;
};
uart2 {
status = okay;
pinctrl-names = default;
pinctrl-0 = uart2_pins;
};
then I configure the UART Port
stty -F /dev/ttys0 cstopb -evenp ispeed 115200
^
stty: /dev/ttys0: No such file or directory
uart2 is not /dev/ttyS0.
uart0 = /dev/ttyS0
uart1 = /dev/ttyS1
uart2 = /dev/ttyS2
Regards,
Peter Hurley
Then I made a user space application for reading and writing data to
device file. I have attached the application program
I connected Tx and Rx pin in same BBB.(Loop back mode)
But I am not able to do simple UART communication in loop back
mode. Do am I missing something? Please help me
--
For more options, visit http://beagleboard.org/discuss
---
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[beagleboard] UART communication in Beaglebone Black
Hi,
I am unable to do simple uart communication in BBB. I have set device
tree
uart2_pins: uart2_pins {
pinctrl-single,pins =
0x154 0x01
0x150 0x31
;
};
uart2 {
status = okay;
pinctrl-names = default;
pinctrl-0 = uart2_pins;
};
then I configure the UART Port
stty -F /dev/ttys0 cstopb -evenp ispeed 115200
Then I made a user space application for reading and writing data to
device file. I have attached the application program
I connected Tx and Rx pin in same BBB.(Loop back mode)
But I am not able to do simple UART communication in loop back
mode. Do am I missing something? Please help me
--
For more options, visit http://beagleboard.org/discuss
---
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BeagleBoard group.
To unsubscribe from this group and stop receiving emails from it, send an email
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//Filename: uart.c
//
//Project : UART
//Author : Jay Kothari
//Contact : jaikothar...@gmail.com
//Date:
#include stdio.h
#include stddef.h
#include time.h
#include termios.h
#include fcntl.h
#include unistd.h
#include sys/types.h
#include string.h
int pauseNanoSec(long nano);
void pauseSec(int sec);
int main(int argc, char *argv[])
{
char buf[30] = /dev/minettyO1;
//UART config using termios
struct termios uart1,old;
int fd;
unsigned char buf2 = 0xA7;
fd = open(buf, O_RDWR | O_NOCTTY);
if(fd 0) printf(port failed to open\n);
while(1)
{
write(fd,buf2,1);
pauseNanoSec(500);
if(read(fd,buf2,1) 0)
printf(%c,buf2);
pauseNanoSec(500);
}
close(fd);
return 0;
}
int pauseNanoSec(long nano)
{
struct timespec tmr1,tmr2;
tmr1.tv_sec = 0;
tmr1.tv_nsec = nano;
if(nanosleep(tmr1,tmr2) 0)
{
printf(Nano second pause failed\n);
return -1;
}
}
void pauseSec(int sec)
{
time_t now,later;
now = time(NULL);
later = time(NULL);
while((later - now) (double)sec)
later = time(NULL);
}
