sergiotarxz/nuttx-apps
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Now have to press enter 3 times to start with USB NSH console

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git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@4772 42af7a65-404d-4744-a932-0658087f49c3
This commit is contained in:
patacongo 2012-05-26 01:45:37 +00:00
parent 66eeafb87a
commit d2ef14cc47
2 changed files with 44 additions and 7 deletions
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3
ChangeLog.txt
View File

@ -234,3 +234,6 @@
* apps/nshlib/nsh_usbdev.c: Add the capability to use an arbitrary USB
device as the console (not necessarily /dev/console). This is a useful
option because then you can still use the serial console to debug with.
* apps/nshlib/nsh_usbdev.c: User now has to press ENTER 3 times before
USB console will start. Otherwise, the USB console starts before there
is anyone at the other end to listen.

48
nshlib/nsh_usbdev.c
View File

@ -92,6 +92,9 @@
#ifdef HAVE_USB_CONSOLE
int nsh_usbconsole(void)
{
char inch;
ssize_t nbytes;
int nlc;
int fd;
int ret;
@ -116,13 +119,7 @@ int nsh_usbconsole(void)
DEBUGASSERT(ret == OK);
#endif
/* Make sure the stdin, stdout, and stderr are closed */
(void)fclose(stdin);
(void)fclose(stdout);
(void)fclose(stderr);
/* Open the USB serial device for writing */
/* Open the USB serial device for read/write access */
do
{
@ -146,6 +143,43 @@ int nsh_usbconsole(void)
}
while (fd < 0);
/* Now waiting until we successfully read a carriage return a few times.
* That is a sure way of know that there is something at the other end of
* the USB serial connection that is ready to talk with us. The user needs
* to hit ENTER a few times to get things started.
*/
nlc = 0;
do
{
/* Read one byte */
inch = 0;
nbytes = read(fd, &inch, 1);
/* Is it a carriage return (or maybe a newline)? */
if (nbytes == 1 && (inch == '\n' || inch == '\r'))
{
/* Yes.. increment the count */
nlc++;
}
else
{
/* No.. Reset the count. We need to see 3 in a row to continue. */
nlc = 0;
}
}
while (nlc < 3);
/* Make sure the stdin, stdout, and stderr are closed */
(void)fclose(stdin);
(void)fclose(stdout);
(void)fclose(stderr);
/* Dup the fd to create standard fd 0-2 */
(void)dup2(fd, 0);