uC/OS II运行到这里出现的如上错误：
;********************************************************************************************************
; START MULTITASKING
; void OSStartHighRdy(void)
;
; Note(s) : 1) This function triggers a PendSV exception(essentially, causes a context switch) to cause
; the first task to start.
;
; 2) OSStartHighRdy() MUST:
; a) Setup PendSV exception priority to lowest;
; b) Set initial PSP to 0, to tell context switcher this is firstrun;
; c) Set OSRunning to TRUE;
; d) Trigger PendSV exception;
; e) Enable interrupts (tasks will run with interruptsenabled).
;********************************************************************************************************
OSStartHighRdy
LDR R0,=NVIC_SYSPRI14 ; Set the PendSV exception priority
LDR R1, =NVIC_PENDSV_PRI
STRB R1,[R0]
MOVS R0,#0 ; Set the PSP to 0 for initial context switch call
MSR PSP, R0