Hi, I have a simple loopback program in my board (bsp lpc_176x), It reads information from a tty and returns it through the same tty (using POSIX functions), I tested it sending characters with a PC's terminal and I saw the ECHO on the terminal, I found an unusual behavior with some bsp configurations, sometimes the first character that I send is returned dirty (some extra bytes are sent), after this first dirty character the program works well. Example:
------------------------------------------------------------------------------------------- void configureUart(const int fd) { struct termios options; tcgetattr(fd, &options); //Set raw mode cfmakeraw(&options); tcsetattr(fd, TCSANOW, &options); } rtems_task Init( rtems_task_argument ignored ) { const int fd = open(TTYSO, O_RDWR); if (fd >= 0) { configureUart(fd); char buffer[1u]; while (true) { if (read(fd, buffer, 1u) == 1u) { write(fd, buffer, 1u); } } close(fd); } while(1); } #define CONFIGURE_APPLICATION_NEEDS_CLOCK_DRIVER #define CONFIGURE_APPLICATION_NEEDS_CONSOLE_DRIVER #define CONFIGURE_MAXIMUM_TASKS 1 #define CONFIGURE_NUMBER_OF_TERMIOS_PORTS 2 #define CONFIGURE_USE_DEVFS_AS_BASE_FILESYSTEM #define CONFIGURE_MAXIMUM_DEVICES 5 #define CONFIGURE_LIBIO_MAXIMUM_FILE_DESCRIPTORS 4 #define CONFIGURE_RTEMS_INIT_TASKS_TABLE #define CONFIGURE_INIT #define CONFIGURE_STACK_CHECKER_ENABLED #include <rtems/confdefs.h> ------------------------------------------------------------------------------------------- In this example, when i press 0123456789 the output looks like: ]�\ B�\^0123456789 I said "with some configurations" because I found that if I define maximum devices to 4 (#define CONFIGURE_MAXIMUM_DEVICES 4) it works well, but with #define CONFIGURE_LIBIO_MAXIMUM_FILE_DESCRIPTORS 4 and if I remove #define CONFIGURE_STACK_CHECKER_ENABLED the problem appears again. I don't know if I'm doing something bad or if it is a bug, Can someone help me with that? Thanks, -- Gabriel Alejandro Ibarra Software Engineer San Lorenzo 47, 3rd Floor, Office 5 Córdoba, Argentina Phone: +54 351 4217888
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