ilovezeno 发表于 2014-3-3 15:06 
因为那是CMSIS函数库的管理范围啊。。。。
对的，因为ARM将Systick放到了CMSIS里面，需要可以去看ARM的CMSIS，
打开库的话，在STM32F4xx\lib\CMSIS\Include\core_cm4.h可以找到原型
- /* ################################## SysTick function ############################################ */
- /** \ingroup CMSIS_Core_FunctionInterface
- \defgroup CMSIS_Core_SysTickFunctions CMSIS Core SysTick Functions
- @{
- */
- #if (__Vendor_SysTickConfig == 0)
- /** \brief System Tick Configuration
- This function initialises the system tick timer and its interrupt and start the system tick timer.
- Counter is in free running mode to generate periodical interrupts.
- \param [in] ticks Number of ticks between two interrupts
- \return 0 Function succeeded
- \return 1 Function failed
- */
- static __INLINE uint32_t SysTick_Config(uint32_t ticks)
- {
- if (ticks > SysTick_LOAD_RELOAD_Msk) return (1); /* Reload value impossible */
- SysTick->LOAD = (ticks & SysTick_LOAD_RELOAD_Msk) - 1; /* set reload register */
- NVIC_SetPriority (SysTick_IRQn, (1<<__NVIC_PRIO_BITS) - 1); /* set Priority for Cortex-M0 System Interrupts */
- SysTick->VAL = 0; /* Load the SysTick Counter Value */
- SysTick->CTRL = SysTick_CTRL_CLKSOURCE_Msk |
- SysTick_CTRL_TICKINT_Msk |
- SysTick_CTRL_ENABLE_Msk; /* Enable SysTick IRQ and SysTick Timer */
- return (0); /* Function successful */
- }
- #endif
| 
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