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关于stm32上ucosII的移植

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dkill|  楼主 | 2008-6-20 14:41 | 只看该作者 回帖奖励 |倒序浏览 |阅读模式
问题1
OS_STK *OSTaskStkInit (void (*task)(void *p_arg), void *p_arg, OS_STK *ptos, INT16U opt)
{
    OS_STK *stk;


    (void)opt;                                 /* 'opt' is not used, prevent warning                     */
    stk       = ptos;                          /* Load stack pointer                                     */

                                               /* Registers stacked as if auto-saved on exception        */
    *(stk)    = (INT32U)0x01000000L;           /* xPSR                                                   */
    *(--stk)  = (INT32U)task;                  /* Entry Point                                            */
    *(--stk)  = (INT32U)0xFFFFFFFEL;           /* R14 (LR) (init value will cause fault if ever used)    */
    *(--stk)  = (INT32U)0x12121212L;           /* R12                                                    */
    *(--stk)  = (INT32U)0x03030303L;           /* R3                                                     */
    *(--stk)  = (INT32U)0x02020202L;           /* R2                                                     */
    *(--stk)  = (INT32U)0x01010101L;           /* R1                                                     */
    *(--stk)  = (INT32U)p_arg;                 /* R0 : argument                                          */

                                               /* Remaining registers saved on process stack             */
    *(--stk)  = (INT32U)0x11111111L;           /* R11                                                    */
    *(--stk)  = (INT32U)0x10101010L;           /* R10                                                    */
    *(--stk)  = (INT32U)0x09090909L;           /* R9                                                     */
    *(--stk)  = (INT32U)0x08080808L;           /* R8                                                     */
    *(--stk)  = (INT32U)0x07070707L;           /* R7                                                     */
    *(--stk)  = (INT32U)0x06060606L;           /* R6                                                     */
    *(--stk)  = (INT32U)0x05050505L;           /* R5                                                     */
    *(--stk)  = (INT32U)0x04040404L;           /* R4                                                     */

    return (stk);
}
堆栈的结构
  不明白的是
 *(--stk)  = (INT32U)0x12121212L;           /* R12                                  
为什么要这样定义  (r1---r12)
是什么意思。
问题2
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