关于stm32寄存器地址定义的小结

最近一直在研读正点原子的stm32开发板，在学习SysTick寄存器的过程中查不到该寄存器的地址是在哪里定义的，很是不解。上网搜后发现 http://www.eepw.com.cn/article/246289.htm
部分代码粘贴如下：

typedef struct
{
  __IO uint32_t CTRL;   /*!< Offset: 0x000 (R/W)  SysTick Control and Status Register */
  __IO uint32_t LOAD;   /*!< Offset: 0x004 (R/W)  SysTick Reload Value Register     */
  __IO uint32_t VAL;    /*!< Offset: 0x008 (R/W)  SysTick Current Value Register    */
  __I  uint32_t CALIB; /*!< Offset: 0x00C (R/ )  SysTick Calibration Register        */
} SysTick_Type; //声明一个SysTick_Type型的结构体。

#define SysTick   ((SysTick_Type   *)     SysTick_BASE  ) /*!< SysTick configuration struct */
#define SysTick_BASE   (SCS_BASE +  0x0010UL) /*!< SysTick Base 


Address  */
#define SCS_BASE   (0xE000E000UL) /*!< System Control Space Base Address  */
　CTRL_TICKINT_Set是一个宏定义，定义如下
/* CTRL TICKINT Mask */
#define CTRL_TICKINT_Set      ((u32)0x00000002)
#define CTRL_TICKINT_Reset    ((u32)0xFFFFFFFD)

上面代码中定义一个SysTick_Type类型的结构体实例SysTick，而从根本上来说这是一个地址，
就是STM32芯片内部分配给滴答时钟的实际地址0xE000E000UL+0x0010UL。SysTick->CTRL |= CTRL_TICKINT_Set;
就是给地址0xE000E000+0x0010 +0x000赋一个0x00000002的值，对应滴答时钟的CTRL寄存器的第2位置1
。即为开启中断的意思。 在该文中有详细的说明，个人觉得事实也本应是这样的，可是在我的core_cm3.h头文件中却找不到对SysTick寄存器定义相应的地址
========================================================================

/** \brief  Structure type to access the System Timer (SysTick).
 */
typedef struct
{
  __IO uint32_t CTRL;                    /*!< Offset: 0x000 (R/W)  SysTick Control and Status Register */
  __IO uint32_t LOAD;                    /*!< Offset: 0x004 (R/W)  SysTick Reload Value Register       */
  __IO uint32_t VAL;                     /*!< Offset: 0x008 (R/W)  SysTick Current Value Register      */
  __I  uint32_t CALIB;                   /*!< Offset: 0x00C (R/ )  SysTick Calibration Register        */
} SysTick_Type;

/* SysTick Control / Status Register Definitions */
#define SysTick_CTRL_COUNTFLAG_Pos         16                                             /*!< SysTick CTRL: COUNTFLAG Position */
#define SysTick_CTRL_COUNTFLAG_Msk       (1UL << SysTick_CTRL_COUNTFLAG_Pos)            /*!< SysTick CTRL: COUNTFLAG Mask */

#define SysTick_CTRL_CLKSOURCE_Pos          2                                             /*!< SysTick CTRL: CLKSOURCE Position */
#define SysTick_CTRL_CLKSOURCE_Msk       (1UL << SysTick_CTRL_CLKSOURCE_Pos)            /*!< SysTick CTRL: CLKSOURCE Mask */

#define SysTick_CTRL_TICKINT_Pos            1                                             /*!< SysTick CTRL: TICKINT Position */
#define SysTick_CTRL_TICKINT_Msk           (1UL << SysTick_CTRL_TICKINT_Pos)              /*!< SysTick CTRL: TICKINT Mask */

#define SysTick_CTRL_ENABLE_Pos  0                                             /*!< SysTick CTRL: ENABLE Position */
#define SysTick_CTRL_ENABLE_Msk            (1UL << SysTick_CTRL_ENABLE_Pos)               /*!< SysTick CTRL: ENABLE Mask */

/* SysTick Reload Register Definitions */
#define SysTick_LOAD_RELOAD_Pos             0                                             /*!< SysTick LOAD: RELOAD Position */
#define SysTick_LOAD_RELOAD_Msk      (0xFFFFFFUL << SysTick_LOAD_RELOAD_Pos)        /*!< SysTick LOAD: RELOAD Mask */

/* SysTick Current Register Definitions */
#define SysTick_VAL_CURRENT_Pos             0                                             /*!< SysTick VAL: CURRENT Position */
#define SysTick_VAL_CURRENT_Msk       (0xFFFFFFUL << SysTick_VAL_CURRENT_Pos)        /*!< SysTick VAL: CURRENT Mask */

/* SysTick Calibration Register Definitions */
#define SysTick_CALIB_NOREF_Pos            31                                             /*!< SysTick CALIB: NOREF Position */
#define SysTick_CALIB_NOREF_Msk            (1UL << SysTick_CALIB_NOREF_Pos)               /*!< SysTick CALIB: NOREF Mask */

#define SysTick_CALIB_SKEW_Pos             30                                             /*!< SysTick CALIB: SKEW Position */
#define SysTick_CALIB_SKEW_Msk             (1UL << SysTick_CALIB_SKEW_Pos)                /*!< SysTick CALIB: SKEW Mask */

#define SysTick_CALIB_TENMS_Pos             0                                             /*!< SysTick CALIB: TENMS Position */
#define SysTick_CALIB_TENMS_Msk       (0xFFFFFFUL << SysTick_VAL_CURRENT_Pos)        /*!< SysTick CALIB: TENMS Mask */

/*@} end of group CMSIS_SysTick */

上面代码中却怎么也找不到SysTick 寄存器地址的定义，黄天不负有心人，最终还是找到了，
原来在正点原子提供的代码中，把所有的寄存器的结构体定义完之后，统一给各个寄存器定义了地址，
该定义在所有结构体定义的后面。代码如下：
------------------------------------------------------------------------

/* Memory mapping of Cortex-M3 Hardware */
#define SCS_BASE    (0xE000E000UL)  /*!< System Control Space Base Address  */
#define ITM_BASE    (0xE0000000UL) /*!< ITM Base Address                   */
#define DWT_BASE    (0xE0001000UL)     /*!< DWT Base Address    */
#define TPI_BASE  (0xE0040000UL) /*!< TPI Base Address                   */
#define CoreDebug_BASE  (0xE000EDF0UL)   /*!< Core Debug Base Address */
#define SysTick_BASE     (SCS_BASE+0x0010UL) /*!< SysTick Base Address   */
#define NVIC_BASE       (SCS_BASE +0x0100UL)  /*!< NVIC Base Address        */
#define SCB_BASE    (SCS_BASE +  0x0D00UL) /*!< System Control 

Block Base Address #define SCnSCB ((SCnSCB_Type*) SCS_BASE ) /!< System control Register not in SCB /

#define SCB ((SCB_Type *) SCB_BASE ) /*!< SCB configuration struct */
#define SysTick ((SysTick_Type *) SysTick_BASE ) /*!< SysTick configuration struct */
#define NVIC ((NVIC_Type *) NVIC_BASE ) /*!< NVIC configuration struct */
#define ITM ((ITM_Type *)ITM_BASE) /*!< ITM configuration struct */
#define DWT ((DWT_Type *) DWT_BASE) /*!< DWT configuration struct */
#define TPI ((TPI_Type *) TPI_BASE ) /*!< TPI configuration struct
#define CoreDebug ((CoreDebug_Type ) eDebug_BASE)/!< Core Debug configuration struct
#if (__MPU_PRESENT == 1)***define MPU_BASE (SCS_BASE + 0x0D90UL) /!< Memory Protection Unit */
#define MPU ((MPU_Type ) MPU_BASE )/!< Memory Protection Unit */
#endif

/@} /
“`

这里定义了详细代码，但个人觉得这种定义可读性不是很强，没有前面的定义直观。对初学者是一种考验。Ok