Dear Joel and Wendell,<br><br>Thank you for your help. I applied all procedures provided and now I can read/write to/from host serial port.<br><br>Best regards,<br>Jeferson. <br><br><div class="gmail_quote">On Tue, Nov 23, 2010 at 6:32 PM, Joel Sherrill <span dir="ltr"><<a href="mailto:joel.sherrill@oarcorp.com">joel.sherrill@oarcorp.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;">Hi,<br>
<br>
I have attached a diff to 4.9 which will make the pc386 install<br>
tty_drv.h. There is also a diff to the fileio sample to show<br>
the configuration changes. Plus a png to show that the<br>
serial devices are there.<br>
<br>
Hopefully this will help.<br><font color="#888888">
<br>
--joel</font><div class="im"><br>
<br>
On 11/23/2010 12:12 PM, Wendell Pereira da Silva wrote:<br>
</div><blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;"><div class="im">
<br>
Jeferson,<br>
<br>
Try to incriese the number of termio file descriptors:<br>
<br>
#define CONFIGURE_NUMBER_OF_TERMIOS_PORTS 6<br>
<br>
Regards,<br>
<br>
Wendell.<br>
<br>
------------------------------------------------------------------------<br>
<br>
*De:*<a href="mailto:rtems-users-bounces@rtems.org" target="_blank">rtems-users-bounces@rtems.org</a> [mailto:<a href="mailto:rtems-users-bounces@rtems.org" target="_blank">rtems-users-bounces@rtems.org</a>] *Em nome de *Jeferson Luiz Rodrigues Souza<br>
*Enviada em:* terça-feira, 23 de novembro de 2010 13:25<br>
*Para:* Joel Sherrill<br>
*Cc:* <a href="mailto:rtems-users@rtems.org" target="_blank">rtems-users@rtems.org</a><br>
*Assunto:* Re: Serial device access with qemu!<br>
<br>
Dear Joel,<br>
<br></div><div><div></div><div class="h5">
On Tue, Nov 23, 2010 at 2:21 PM, Joel Sherrill <<a href="mailto:joel.sherrill@oarcorp.com" target="_blank">joel.sherrill@oarcorp.com</a> <mailto:<a href="mailto:joel.sherrill@oarcorp.com" target="_blank">joel.sherrill@oarcorp.com</a>>> wrote:<br>
<br>
On 11/23/2010 02:50 AM, Jeferson Luiz Rodrigues Souza wrote:<br>
<br>
Hi everyone,<br>
<br>
I am trying to access a serial port in RTEMS 4.9.4 using a pc586 bsp. However, when I execute the application using qemu the code cannot open the device, and the perror() function presents the following message: "No such file or directory". It seems that RTEMS did not initialize a properly driver to handle serial device. Is it right?<br>
<br>
The qemu command line is:<br>
<br>
sudo qemu -serial "/dev/ttyS0" -fda floppy.img -boot a<br>
<br>
I made a search in this list and I found references about serial port access but nothing to help in my case. Could anyone help me or point me some documentation about serial port access in RTEMS?<br>
<br>
The code used in the test is presented below. I do not have some experience with RTEMS and I do not know the source of this problem.<br>
<br>
The /dev/ttyS0 above is the host serial port. The -serial says<br>
attach attach the serial port COM1 on the target simulator<br>
PC to the specified device. So you are attaching the virtual<br>
COM1 to the real serial port on the host /dev/ttyS0. Is that<br>
what you intend to do?<br>
<br>
FWIW COM1 --> /dev/ttyS1<br>
COM2 --> /dev/ttyS2<br>
<br>
on the RTEMS target.<br>
<br>
<br>
I need to read some data from a device connected in the host serial port (e.g. /dev/ttyS0) inside an application running in RTEMS with qemu. So, is my source code correct? or Do I need some extra configuration?<br>
<br>
Where is the name of serial devices in RTEMS defined? I tried use the open() function as follows:<br>
<br>
int serial_fp = open("/dev/ttyS0",O_RDONLY);<br>
or<br>
int serial_fp = open("/dev/ttyS1",O_RDONLY);<br>
or<br>
int serial_fp = open("COM1",O_RDONLY);<br>
<br>
and got the same message when I checked the serial_fp value and print the error message using perror() function: "No such file or directory"<br>
<br>
Thanks to reply,<br>
<br>
Best regards,<br>
Jeferson.<br>
<br>
--joel<br>
<br>
Thanks,<br>
jefecomp.<br>
<br>
<br>
#include <signal.h><br>
#include <stdlib.h><br>
#include <stdio.h><br>
#include <pthread.h><br>
#include <uart.h><br>
#include <termios.h><br>
#include<sched.h><br>
#include <bsp.h><br>
#include <fcntl.h><br>
#include <sys/types.h><br>
#include <sys/stat.h><br>
<br>
#define CONFIGURE_INIT<br>
#include <rtems.h><br>
<br>
<br>
void *POSIX_Init();<br>
<br>
#define CONFIGURE_APPLICATION_NEEDS_CONSOLE_DRIVER<br>
#define CONFIGURE_APPLICATION_NEEDS_CLOCK_DRIVER<br>
#define CONFIGURE_APPLICATIONS_NEEDS_RTC_DRIVER<br>
#define CONFIGURE_MICROSECONDS_PER_TICK 1000<br>
<br>
#define CONFIGURE_MAXIMUM_POSIX_THREADS 10<br>
#define CONFIGURE_MAXIMUM_POSIX_CONDITION_VARIABLES 10<br>
#define CONFIGURE_MAXIMUM_POSIX_MUTEXES 10<br>
#define CONFIGURE_MAXIMUM_POSIX_SEMAPHORES 10<br>
#define CONFIGURE_MAXIMUM_POSIX_TIMERS 10<br>
#define CONFIGURE_MAXIMUM_POSIX_QUEUED_SIGNALS 40<br>
#define CONFIGURE_MAXIMUM_POSIX_MESSAGE_QUEUES 10<br>
#define CONFIGURE_POSIX_INIT_THREAD_TABLE<br>
#define CONFIGURE_LIBIO_MAXIMUM_FILE_DESCRIPTORS 5<br>
#define CONFIGURE_NUMBER_OF_TERMIOS_PORTS 3<br>
#include<rtems/confdefs.h><br>
<br>
void *POSIX_Init()<br>
{<br>
printf("Serial Port Test!!!\n");<br>
<br>
char buffer[255];<br>
int bytesRead;<br>
int serial_fp = open("/dev/ttyS0",O_RDONLY);<br>
<br>
printf("SERIAL_FP = %i\n",serial_fp);<br>
<br>
if(serial_fp < 0)<br>
{<br>
printf("FAILURE TO OPEN SERIAL PORT\n");<br>
perror(serial_fp);<br>
exit(-1);<br>
}<br>
<br>
//write(serial_fp,buffer,strlen(buffer)+1);<br>
bytesRead = read(serial_fp, buffer, 255);<br>
<br>
<br>
if(bytesRead < 0)<br>
{<br>
printf("Problems in the read of Serial Port");<br>
close(serial_fp);<br>
exit(1);<br>
}<br>
else<br>
buffer[bytesRead] = 0;<br>
<br>
<br>
printf(buffer);<br>
<br>
close(serial_fp);<br>
exit(0);<br>
}<br>
<br>
-- Joel Sherrill, Ph.D. Director of Research& Development<br>
joel.sherrill@OARcorp.com On-Line Applications Research<br>
Ask me about RTEMS: a free RTOS Huntsville AL 35805<br>
Support Available (256) 722-9985<br>
<br>
</div></div></blockquote><div><div></div><div class="h5">
<br>
<br>
-- <br>
Joel Sherrill, Ph.D. Director of Research& Development<br>
joel.sherrill@OARcorp.com On-Line Applications Research<br>
Ask me about RTEMS: a free RTOS Huntsville AL 35805<br>
Support Available (256) 722-9985<br>
<br>
<br>
</div></div></blockquote></div><br><div style="visibility: hidden; display: inline;" id="avg_ls_inline_popup"></div><style type="text/css">#avg_ls_inline_popup { position:absolute; z-index:9999; padding: 0px 0px; margin-left: 0px; margin-top: 0px; width: 240px; overflow: hidden; word-wrap: break-word; color: black; font-size: 10px; text-align: left; line-height: 13px;}</style>