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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