Hello,
I am working on a project that uses the RTEMS OS on a Leon3 processor. I am
trying to read/write from a UART that is connected up through the termios
interface. It works for the most part but I am running into an issue with
flushing and reading from the UART. It seems if I read a small portion of the
data use read() then flush then read again there is still data returned. Is
this expected behavior? If so is there any way to clear out whatever is cached
in read?
Pseudo Code
Open UART with open("/dev/console_b", O_RDWR | O_NONBLOCK); setup terminal into
raw mode with cfmakeraw() and tcsetattr(fd,
TCSADRAIN,term)
Setup the UART into loop back mode so its TX data is looped back into its RX
Write data into UART with write(fd, "TEST",4) Read a single character with
read(fd, buff, 1); buff will contain "T" here flush buffers with tcflush(fd,
TCIOFLUSH) Read a more from UART with read(fd, buff, 3); Would expect nothing
is returned here but "EST" will be returned.
Jeff Hatton
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