sergiotarxz/nuttx
sergiotarxz/nuttx
1
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity

Add retry on open; say hello many times

Browse Source 
git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@993 42af7a65-404d-4744-a932-0658087f49c3
This commit is contained in:
patacongo 2008-10-07 23:04:52 +00:00
parent 3ade50f7e4
commit 9b6911e9be
1 changed files with 68 additions and 8 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

76
examples/usbserial/main.c
View File

@ -46,6 +46,20 @@
* Definitions
****************************************************************************/
#ifdef CONFIG_CPP_HAVE_VARARGS
# ifdef CONFIG_DEBUG
# define message(...) lib_lowprintf(__VA_ARGS__)
# else
# define message(...) printf(__VA_ARGS__)
# endif
#else
# ifdef CONFIG_DEBUG
# define message lib_lowprintf
# else
# define message printf
# endif
#endif
/****************************************************************************
* Private Data
****************************************************************************/
@ -78,26 +92,72 @@ int user_start(int argc, char *argv[])
/* Initialize the USB serial driver */
message("user_start: Registering USB serial driver\n");
ret = usbdev_serialinitialize(0);
if (ret < 0)
{
printf("ERROR: Failed to create the USB serial device: %d\n", -ret);
message("user_start: ERROR: Failed to create the USB serial device: %d\n", -ret);
return 1;
}
message("user_start: Successfully registered the serial driver\n");
/* Open the USB serial device for output */
stream = fopen("/dev/ttyUSB0", "w");
if (!stream)
do
{
printf("ERROR: Failed to open /dev/ttyUSB0: %d\n", errno);
return 2;
message("user_start: Opening USB serial driver\n");
stream = fopen("/dev/ttyUSB0", "w");
if (!stream)
{
int errcode = errno;
message("user_start: ERROR: Failed to open /dev/ttyUSB0: %d\n", errcode);
/* ENOTCONN means that the USB device is not yet connected */
if (errcode = ENOTCONN)
{
message("user_start: Not connected. Wait and try again.\n");
sleep(5);
}
else
{
/* Give up on other errors */
message("user_start: Aborting\n");
return 2;
}
}
}
while (!stream);
message("user_start: Successfully opened the serial driver\n");
/* Then say hello -- forever */
for (;;)
{
message("user_start: Saying hello\n");
ret = fprintf(stream, "Hello, World!!\n");
if (ret < 0)
{
message("user_start: ERROR: fprintf failed: %d\n", errno);
fclose(stream);
return 3;
}
ret = fflush(stream);
if (ret < 0)
{
message("user_start: ERROR: fflush failed: %d\n", errno);
fclose(stream);
return 4;
}
message("user_start: Waiting\n");
sleep(5);
}
/* Then say hello */
/* Won't get here, but if we did this what we would have to do */
fprintf(stream, "Hello, World!!\n");
fflush(stream);
fclose(stream);
return 0;
}