Hi,
On 26/08/2020 5:36 pm, Schweikhardt, Jens (TSPCE3-TL4) wrote:
Hello world\n
I’m observing a 256 byte input limit with RTEMS 5 on riscv that I
don’t know how to overcome.
We are using the RTEMS console driver and newlib stdio.
The effect is that an fgets() appears to only accept 256 characters,
specifically if we connect via
picocom on a Linux box, we can type exactly 256 chars and then no more
characters are accepted.
My first guess was that stdio buffers are 256 byte by default, which
they seem to be judging from
grepping for BUFSIZ. Then using setvbuf should be the way to increase
their size. But setvbuf had no effect.
Next guess was that it is a limit of picocom. So we tried using Python
with pyserial to send data.
Same problem.
Not sure if is the best practice, but we override the size of the
buffers in:
rtems-5/cpukit/libcsupport/src/termios.c:87
|static size_t rtems_termios_cbufsize = 1024; static size_t
rtems_termios_raw_input_size = 1024; static size_t
rtems_termios_raw_output_size = 1024; This overrides the raw input and
output and the cooked buffer. Hope this helps. regards, Ian Caddy Goanna
Technologies Pty Ltd |
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