[RTEMS Project] #2794: ARM TMS570 BSP: Serial port hangs when baudrate change initiates before all characters are sent

[RTEMS trac]

#2794: ARM TMS570 BSP: Serial port hangs when baudrate change initiates before all
characters are sent
--------------------+-------------------
 Reporter:  ppisa   |       Owner:
     Type:  defect  |      Status:  new
 Priority:  normal  |   Milestone:  4.11
Component:  bsps    |     Version:  4.11
 Severity:  normal  |  Resolution:
 Keywords:          |
--------------------+-------------------

Comment (by ppisa):

 Fixed in 94e3c8384ff2573877d61f387eb090e2e5e12aff

 bsp/tms570: ensure that change of SCI baudrate is not applied in the
 middle of character Tx.

 The rtems_monitor_task() setups/updates termios attributes
 of the opened TTY and if there is ongoing some other output
 it leads to the stuck.

 It would be better to use some termios API function which
 would call drainOutput() in rtems/cpukit/libcsupport/src/termios.c.
 But functionality is not accessible outside of core termios
 implementation.

 The loop waiting for last character to be sent has to be there anyway
 because hardware does not provide Tx machine/shift register empty
 interrupt.

 Closes #2794

--
Ticket URL: <http://devel.rtems.org/ticket/2794#comment:1>
RTEMS Project <http://www.rtems.org/>
RTEMS Project