#if 0
#define  OS_CPU_CM3_NVIC_ST_CTRL    (*((volatile INT32U *)0xE000E010))   /* SysTick Ctrl & Status Reg. */
#define  OS_CPU_CM3_NVIC_ST_RELOAD  (*((volatile INT32U *)0xE000E014))   /* SysTick Reload  Value Reg. */
#define  OS_CPU_CM3_NVIC_ST_CURRENT (*((volatile INT32U *)0xE000E018))   /* SysTick Current Value Reg. */
#define  OS_CPU_CM3_NVIC_ST_CAL     (*((volatile INT32U *)0xE000E01C))   /* SysTick Cal     Value Reg. */
#define  OS_CPU_CM3_NVIC_PRIO_ST    (*((volatile INT8U  *)0xE000ED23))   /* SysTick Handler Prio  Reg. */

#define  OS_CPU_CM3_NVIC_ST_CTRL_COUNT                    0x00010000     /* Count flag.                */
#define  OS_CPU_CM3_NVIC_ST_CTRL_CLK_SRC                  0x00000004     /* Clock Source.              */
#define  OS_CPU_CM3_NVIC_ST_CTRL_INTEN                    0x00000002     /* Interrupt enable.          */
#define  OS_CPU_CM3_NVIC_ST_CTRL_ENABLE                   0x00000001     /* Counter mode.              */
#define  OS_CPU_CM3_NVIC_PRIO_MIN                               0xFF     /* Min handler prio.          */
#endif

以及
#if 0
void  OS_CPU_SysTickHandler (void)
{
    OS_CPU_SR  cpu_sr;


    OS_ENTER_CRITICAL();                         /* Tell uC/OS-II that we are starting an ISR          */
    OSIntNesting++;
    OS_EXIT_CRITICAL();

    OSTimeTick();                                /* Call uC/OS-II's OSTimeTick()                       */

    OSIntExit();                                 /* Tell uC/OS-II that we are leaving the ISR          */
}
#endif

#if 0
void  OS_CPU_SysTickInit (void)
{
    INT32U  cnts;


    cnts = OS_CPU_SysTickClkFreq() / OS_TICKS_PER_SEC;

    OS_CPU_CM3_NVIC_ST_RELOAD = (cnts - 1);
                                                 /* Set prio of SysTick handler to min prio.           */ GPRS家庭防盗报警系统的设计+流程图(8):http://www.751com.cn/zidonghua/lunwen_3457.html