Hi Neil,
digging through old unread emails
Answering inline.
On 7/6/18 4:58 PM, Neil Jones wrote:
Hi all,
I'm working on improving IRQ support on PIC32 and I'm testing UART Rx using
the shell.
The shell uses putchar, but putchar is buffered and needs a flush, thus
when typing at the console I get no feedback until I press enter (the line
feed gets echo'd and then we get the flush).
I'm surprised other newlib implementations don't see this ?
I think most developers have their local program doing the 'echo' for
them and only sending lines by lines anyway.
So I personally do not really pay attention to this. I did not even knew
we were doing 'echo' by default…
A flush is probably needed here:
#if !defined(SHELL_NO_ECHO) || !defined(SHELL_NO_PROMPT)
#ifdef MODULE_NEWLIB
/* use local copy of putchar, as it seems to be inlined,
* enlarging code by 50% */
static void _putchar(int c) {
putchar(c);
fflush(STDOUT) <------- HERE
}
#else
#define _putchar putchar
#endif
#endif
I agree it could make sense to add it when in `echo` mode only.
putchar(c)
#ifndef SHELL_NO_ECHO
fflush(stdout);
#endif
As for the shell prompt it is already handled here
https://github.com/RIOT-OS/RIOT/blob/master/sys/shell/shell.c#L273-L280
I'm happy to do a PR for this, but this is very core functionality, I don't
want to break anything ??
But maybe other developers have more knowledge about this.
Cheers,
Gaëtan
Cheers,
Neil
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