From 9b6911e9be9507f92e47bf3461d6c5f4cd8afb0b Mon Sep 17 00:00:00 2001
From: patacongo <patacongo@42af7a65-404d-4744-a932-0658087f49c3>
Date: Tue, 7 Oct 2008 23:04:52 +0000
Subject: [PATCH] Add retry on open; say hello many times
git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@993 42af7a65-404d-4744-a932-0658087f49c3
---
examples/usbserial/main.c | 76 ++++++++++++++++++++++++++++++++++-----
1 file changed, 68 insertions(+), 8 deletions(-)
diff --git a/examples/usbserial/main.c b/examples/usbserial/main.c
index 3657fc9fe1..e901938aa3 100644
--- a/examples/usbserial/main.c
+++ b/examples/usbserial/main.c
@@ -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
+ {
+ 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 (;;)
{
- printf("ERROR: Failed to open /dev/ttyUSB0: %d\n", errno);
- return 2;
+ 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;
}
--
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