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6678, Ethernet, TaskSelf() causes SYS/BIOS to crash.

Greg Reuter
Intellectual 535 points
Other Parts Discussed in Thread: SYSBIOS

Hi,

Calling TaskSelf() causes the operating system to crash with these error messages:
[C66xx_0] 0. taskself1. init file descriptor environmentti.sysbios.knl.Task: line 895: assertion failure: A_badPriority: An invalid task priority was used.
[C66xx_0] xdc.runtime.Error.raise: terminating execution


Can someone please help me understand the error messages and how to fix it?


Here is some background:
Using CCSv5.1.0.09000 to program TMDXEVM6678L.
I started with the example C:\Program Files\Texas Instruments\mcsdk_2_00_05_17\examples\ndk\helloWorldHelloWorld example - it works.
I added an idle task in SYSBIOS for background processing - it works (toggles LEDs for now).
I am attempting to transmit UDP in the idle loop, but can't even do the first step, TaskSelf(), without crashing.
I think these are the steps I would need:
   1  fdOpenSession(TaskSelf());
   2  s = socket( AF_INET, SOCK_DGRAM, 0 );
   3  bind(s, (PSA)&sin, sizeof(sin));
   4  sendto( s, &gregs_string, strlen(gregs_string), 0, (PSA)&sin, sizeof(sin) );

Greg Reutr

 

  • 0
    TI__Guru* 96960 points

    Hi Greg,

    This will not work. NDK will try to change the priority of the task as part of it's critical region management. You cannot change the priority of the SYS/BIOS Idle Task. Idle functions have some other restrictions that would limit your approach also (e.g. no blocking on a semaphore in an Idle function). 

    Todd

  • 0 in reply to ToddMullanix
    Intellectual 535 points

    Thanks Todd,

    I made a new thread and it stopped crashing.  No sign of the new port transmitting, monitoring a hub with wireshark, but it might be near (hopefully).  I've had success with signal processing but Ethernet and RTOS is new to me. 

    Greg