求助：勾选Use MicroLIB进入硬件错误中断

opopop456456exx · 发表于 2017-10-6 16:47:46

移植的UCOSIII系统，只运行了一个点灯和一个串口的任务，没勾选Use MircoLib之前一切正常，勾选了Use MircoLib之后（除了勾选之外无任何改动）程序跑飞，进入硬件中断错误。
调试了下，跑飞位置位于OSStart（）函数里的OSStartHighRdy（），之后进入硬件中断错误，说明在创建开始任务之后，正准备启动整个OS时卡死了

void  OSStart (OS_ERR  *p_err)
{
#ifdef OS_SAFETY_CRITICAL
if (p_err == (OS_ERR *)0) {
      OS_SAFETY_CRITICAL_EXCEPTION();
      return;
}
#endif

if (OSRunning == OS_STATE_OS_STOPPED) {
      OSPrioHighRdy = OS_PrioGetHighest();             /* Find the highest priority                            */
      OSPrioCur    = OSPrioHighRdy;
      OSTCBHighRdyPtr = OSRdyList[OSPrioHighRdy].HeadPtr;
      OSTCBCurPtr    = OSTCBHighRdyPtr;
      OSRunning    = OS_STATE_OS_RUNNING;
      OSStartHighRdy();                                  /* Execute target specific code to start task          */
   *p_err          = OS_ERR_FATAL_RETURN;             /* OSStart() is not supposed to return                   */
} else {
   *p_err          = OS_ERR_OS_RUNNING;             /* OS is already running                               */
}
}

再具体一点到汇编里面应该是在这里：

721:       OSStartHighRdy();                                  /* Execute target specific code to start task          */
0x0800425C F007FD26  BL.W       OSStartHighRdy (0x0800BCAC)
722:       *p_err          = OS_ERR_FATAL_RETURN;             /* OSStart() is not supposed to return                   */
723:    } else {
0x08004260 F6432099  MOVW       r0,#0x3A99
0x08004264 8020    STRH       r0,[r4,#0x00]
0x08004266 E002    B          0x0800426E
724:       *p_err          = OS_ERR_OS_RUNNING;             /* OS is already running                               */
725:    }
0x08004268 F645608A  MOVW       r0,#0x5E8A
0x0800426C 8020    STRH       r0,[r4,#0x00]

进入到 OSStartHighRdy (0x0800BCAC)看看：
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

LDR    R0, =OS_CPU_ExceptStkBase                         ; Initialize the MSP to the OS_CPU_ExceptStkBase
LDR    R1, [R0]
MSR    MSP, R1

LDR    R0, =NVIC_INT_CTRL                               ; Trigger the PendSV exception (causes context switch)
LDR    R1, =NVIC_PENDSVSET
STR    R1, [R0]

CPSIE I                                                 ; Enable interrupts at processor level

OSStartHang
B    OSStartHang                                        ; Should never get here

网上查了很多，遇到这种情况的人比较少啊，没有什么很好的思路，自己也一直想不太明白，求助各位大大！