网上找到了更详细资料 1) OS_CORE.C:
OSIntExit() and OS_Sched() have changed slightly because of a boundary condition found with the Cortex-M3 port. Specifically, we needed to move the statement:
OSTCBHighRdy = OSTCBPrioTbl[OSPrioHighRdy];
Before testing for the priority.
2.86中的代码是这样的：
void OS_Sched (void)
{
#if OS_CRITICAL_METHOD == 3 /* Allocate storage for CPU status register */
OS_CPU_SR cpu_sr = 0;
#endif
OS_ENTER_CRITICAL();
if (OSIntNesting == 0) { /* Schedule only if all ISRs done and ... */
if (OSLockNesting == 0) { /* ... scheduler is not locked */
OS_SchedNew();
if (OSPrioHighRdy != OSPrioCur) { /* No Ctx Sw if current task is highest rdy */
OSTCBHighRdy = OSTCBPrioTbl[OSPrioHighRdy];
#if OS_TASK_PROFILE_EN > 0
OSTCBHighRdy->OSTCBCtxSwCtr++; /* Inc. # of context switches to this task */
#endif
OSCtxSwCtr++; /* Increment context switch counter */
OS_TASK_SW(); /* Perform a context switch */
}
}
}
OS_EXIT_CRITICAL();
}
2.88中的是这样的：
void OS_Sched (void)
{
#if OS_CRITICAL_METHOD == 3u /* Allocate storage for CPU status register */
OS_CPU_SR cpu_sr = 0u;
#endif
OS_ENTER_CRITICAL();
if (OSIntNesting == 0u) { /* Schedule only if all ISRs done and ... */
if (OSLockNesting == 0u) { /* ... scheduler is not locked */
OS_SchedNew();
OSTCBHighRdy = OSTCBPrioTbl[OSPrioHighRdy];
if (OSPrioHighRdy != OSPrioCur) { /* No Ctx Sw if current task is highest rdy */
#if OS_TASK_PROFILE_EN > 0u
OSTCBHighRdy->OSTCBCtxSwCtr++; /* Inc. # of context switches to this task */
#endif
OSCtxSwCtr++; /* Increment context switch counter */
OS_TASK_SW(); /* Perform a context switch */
}
}
}
OS_EXIT_CRITICAL();
}
修改了两个地方、把优先级判断与优先级切换掉过来了，个人感觉应该是对的

确认是这个问题，本人已经全部改过来了。死机现象已派出。楼主我正打算把文件传上来就被楼上捅开了。

V2.86的BUG修改方式
原代码：
if (OSPrioHighRdy != OSPrioCur)
{ /* No Ctx Sw if current task is highest rdy */
OSTCBHighRdy = OSTCBPrioTbl[OSPrioHighRdy];
...
}
修改后：
OSTCBHighRdy = OSTCBPrioTbl[OSPrioHighRdy];
if (OSPrioHighRdy != OSPrioCur)
{ /* No Ctx Sw if current task is highest rdy */
...
}
大家注意：OSTCBHighRdy = OSTCBPrioTbl[OSPrioHighRdy];的位置有变化，这是高优先级任务调度失败的原因。