RTEMS on QEMU with virtual serial device

[Мороз Олег]

I've solved my problem using code changes

diff --git a/c/src/lib/libbsp/i386/shared/comm/uart.c 
b/c/src/lib/libbsp/i386/shared/comm/uart.c

index 3c4d42a..3552fe6 100644

--- a/c/src/lib/libbsp/i386/shared/comm/uart.c

+++ b/c/src/lib/libbsp/i386/shared/comm/uart.c

@@ -568,12 +568,13 @@ BSP_uart_termios_read_com2(int uart)

ssize_t

BSP_uart_termios_write_com1(int minor, const char *buf, size_t len)

{

+ if(len <= 0)

+ {

+ return 0;

+ }

assert(buf != NULL);

- if(len <= 0)

- {

- return 0;

- }

+

/* If there TX buffer is busy - something is royally screwed up */

assert((uread(BSP_UART_COM1, LSR) & THRE) != 0);

@@ -602,13 +603,13 @@ BSP_uart_termios_write_com1(int minor, const char 
*buf, size_t len)

ssize_t

BSP_uart_termios_write_com2(int minor, const char *buf, size_t len)

{

- assert(buf != NULL);

+

if(len <= 0)

{

return 0;

}

-

+ assert(buf != NULL);

/* If there TX buffer is busy - something is royally screwed up */

assert((uread(BSP_UART_COM2, LSR) & THRE) != 0);




Is it alright?


On 28.09.2014 19:19, Wendell Silva wrote:
> Have you tried:
>   qemu-system-i386 -serial file:/tmp/1.txt -serial file:/tmp/2.txt 
> -kernel ...
>
> Or open ttyS1 instead?
>
> --Wendell.
>
>
> 2014-09-28 4:52 GMT-03:00 Олег Мороз <oleg.moroz at mcc.vniiem.ru 
> <mailto:oleg.moroz at mcc.vniiem.ru>>:
>
>     Hello everyone, i'm trying to develop RTEMS app using QEMU VM. How
>     can i use virtual serial device for two side data exchange between
>     VM and host machine. I'm trying to use it in that way:
>
>
>
>     #include <bsp.h> /* for device driver prototypes */
>
>     #define CONFIGURE_LIBIO_MAXIMUM_FILE_DESCRIPTORS 20
>     #define CONFIGURE_APPLICATION_EXTRA_DRIVERS TTY2_DRIVER_TABLE_ENTRY
>     #define CONFIGURE_APPLICATION_NEEDS_LIBBLOCK
>     #define CONFIGURE_USE_IMFS_AS_BASE_FILESYSTEM
>     #define CONFIGURE_NUMBER_OF_TERMIOS_PORTS 6
>
>     #define CONFIGURE_APPLICATION_NEEDS_CONSOLE_DRIVER
>     #define CONFIGURE_APPLICATION_NEEDS_CLOCK_DRIVER
>     .....
>
>
>     then in my app i'm trying to open /dev/ttyS2 device
>
>       unsigned char data[4] = {1,2,3,4};
>       int f =open("/dev/ttyS2", O_RDWR | O_NOCTTY | _FNDELAY);
>       if (f>0)
>       {
>           printf("write data %d\n",write(f,data,4));
>       }
>
>     then start QEMU
>     qemu-system-i386 -serial file:/tmp/1.txt -kernel zvezda_shell.exe
>
>
>     In QEMU shell i've seen
>     Device: /dev/ttyS2 initialized.
>     write data 4
>
>     But in fact file /tmp/1.txt has no data. How can i solve it and
>     use QEMU -serial for both side data exchange?
>     _______________________________________________
>     devel mailing list
>     devel at rtems.org <mailto:devel at rtems.org>
>     http://lists.rtems.org/mailman/listinfo/devel
>
>

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