stm32最新库3.5中断函数问题

只看该作者 · 2012-10-21 09:22

由于最近手上有一个方案用到了stm32f107,不得已，要搭建新的模板平台。
阅读了下最新的库函数文件。

其中对于 static __INLINE void NVIC_SetPriorityGrouping(uint32_t PriorityGroup)函数有些疑问
{
  uint32_t reg_value;
  uint32_t PriorityGroupTmp = (PriorityGroup & 0x07);                      /* only values 0..7 are used       */

  reg_value  =  SCB->AIRCR;                                                 /* read old register configuration */
  reg_value &= ~(SCB_AIRCR_VECTKEY_Msk | SCB_AIRCR_PRIGROUP_Msk);          /* clear bits to change             */
  reg_value  =  (reg_value                      |
            (0x5FA << SCB_AIRCR_VECTKEY_Pos) |
            (PriorityGroupTmp << 8));                                  /* Insert write key and priorty group */
  SCB->AIRCR =  reg_value;
}

其中 PriorityGroup 在声明中/* only values 0..7 are used */

而以前的是
/* Preemption Priority Group -------------------------------------------------*/
#define NVIC_PriorityGroup_0       ((u32)0x700) /* 0 bits for pre-emption priority
                                                   4 bits for subpriority */
#define NVIC_PriorityGroup_1       ((u32)0x600) /* 1 bits for pre-emption priority
                                                   3 bits for subpriority */
#define NVIC_PriorityGroup_2       ((u32)0x500) /* 2 bits for pre-emption priority
                                                   2 bits for subpriority */
#define NVIC_PriorityGroup_3       ((u32)0x400) /* 3 bits for pre-emption priority
                                                   1 bits for subpriority */
#define NVIC_PriorityGroup_4       ((u32)0x300) /* 4 bits for pre-emption priority
                                                   0 bits for subpriority */

void NVIC_PriorityGroupConfig(u32 NVIC_PriorityGroup)
{
  /* Check the parameters */
  assert_param(IS_NVIC_PRIORITY_GROUP(NVIC_PriorityGroup));

  /* Set the PRIGROUP[10:8] bits according to NVIC_PriorityGroup value */
  SCB->AIRCR = AIRCR_VECTKEY_MASK | NVIC_PriorityGroup;
}

最后发现如果NVIC_SetPriorityGrouping函数调用的参数是0~7其两函数结果是不一样的。

其中还有NVIC_EncodePriority和NVIC_DecodePriority中的参数Priority应该怎么填才是对的。这两函数中的内容还没有去核实。希望有人能解答我上述疑问