系统默认是哪组

1万 · 2017-8-27 18:00

我看好多例程里面都没有显式配置NVIC_PriorityGroupConfig()，那系统默认是哪组呢，以stm32f103为例

1万 · 2017-8-27 18:02

默认应该是0啊

1万 · 2017-8-27 18:03

这个是配置LCD液晶屏的吧，我看好多液晶屏说是用这个借口。

1万 · 2017-8-27 18:05

默认是0

1万 · 2017-8-27 18:06

确实默认为0，
#define NVIC_PriorityGroup_0       ((uint32_t)0x700) /*!< 0 bits for pre-emption priority
                                                         4 bits for subpriority */
#define NVIC_PriorityGroup_1       ((uint32_t)0x600) /*!< 1 bits for pre-emption priority
                                                         3 bits for subpriority */
#define NVIC_PriorityGroup_2       ((uint32_t)0x500) /*!< 2 bits for pre-emption priority
                                                         2 bits for subpriority */
#define NVIC_PriorityGroup_3       ((uint32_t)0x400) /*!< 3 bits for pre-emption priority
                                                         1 bits for subpriority */
#define NVIC_PriorityGroup_4       ((uint32_t)0x300) /*!< 4 bits for pre-emption priority
                                                         0 bits for subpriority */

#define IS_NVIC_PRIORITY_GROUP(GROUP) (((GROUP) == NVIC_PriorityGroup_0) || \
                                    ((GROUP) == NVIC_PriorityGroup_1) || \
                                    ((GROUP) == NVIC_PriorityGroup_2) || \
                                    ((GROUP) == NVIC_PriorityGroup_3) || \
                                    ((GROUP) == NVIC_PriorityGroup_4))

我在里面看到了