Using MQX370 on Kinetis.
ITTYE at 115,200 no handshake.
BSP_DEFAULT_IO_OPEN_MODE (pointer) ( IO_SERIAL_RAW_IO | IO_SERIAL_NON_BLOCKING)
A single task looks every 10mS to see if any chars have come in, and reliably detects them all.
A series of calls to _io_write() from within the same task will intermittently fail to transmit the chars.
Buffer size is set to 64, and we never get close to filling that.
Lowest level call (_io_serial_int_putc_internal) appears to offer a pass/fail return, but I think MQX throws that away half-way up the stack? As usual, the documentation is pathetic.
(From the IOUG)
The serial device driver provides these services:
Calls Interrupt-driven Polled
_io_fopen() _io_serial_int_open() _io_serial_polled_open()
_io_fclose() _io_serial_int_close() _io_serial_polled_close()
_io_read() _io_serial_int_read() _io_serial_polled_read()
_io_write() _io_serial_int_write() _io_serial_polled_write()
_io_ioctl() _io_serial_int_ioctl() _io_serial_polled_ioctl()
Well that was useful!
This used to be simple - an IRQ for RX chars, and a blocking call waiting on TXBuffEmpty to transmit them was 100% reliable.
But there is no setting for "non-blocking on RX only" in the MQX driver.
Anybody got any ideas? Maybe use IOControl calls to see if it is safe to send? look for the rval on _io_write, and do what? Flush the bufffer on every character transmit?
Thanks in advance