If you find your application is crashing here then likely causes are:\r
1) Stack overflow - \r
see http://www.freertos.org/Stacks-and-stack-overflow-checking.html\r
- 2) Incorrect interrupt priority assignment, especially on Cortex M3 \r
+ 2) Incorrect interrupt priority assignment, especially on Cortex-M3 \r
parts where numerically high priority values denote low actual \r
interrupt priories, which can seem counter intuitive. See \r
configMAX_SYSCALL_INTERRUPT_PRIORITY on http://www.freertos.org/a00110.html\r