中斷相關函數
NVIC_PriorityGroupConfig
void NVIC_PriorityGroupConfig(uint32_t NVIC_PriorityGroup);
#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 */
NVIC_Init
void NVIC_Init(NVIC_InitTypeDef* NVIC_InitStruct);
typedef struct
{
uint8_t NVIC_IRQChannel; /*!< Specifies the IRQ channel to be enabled or disabled.
This parameter can be a value of @ref IRQn_Type
(For the complete STM32 Devices IRQ Channels list, please
refer to stm32f10x.h file) */
uint8_t NVIC_IRQChannelPreemptionPriority; /*!< Specifies the pre-emption priority for the IRQ channel
specified in NVIC_IRQChannel. This parameter can be a value
between 0 and 15 as described in the table @ref NVIC_Priority_Table */
uint8_t NVIC_IRQChannelSubPriority; /*!< Specifies the subpriority level for the IRQ channel specified
in NVIC_IRQChannel. This parameter can be a value
between 0 and 15 as described in the table @ref NVIC_Priority_Table */
FunctionalState NVIC_IRQChannelCmd; /*!< Specifies whether the IRQ channel defined in NVIC_IRQChannel
will be enabled or disabled.
This parameter can be set either to ENABLE or DISABLE */
} NVIC_InitTypeDef;
============================================================================================================================
NVIC_PriorityGroup | NVIC_IRQChannelPreemptionPriority | NVIC_IRQChannelSubPriority | Description
============================================================================================================================
NVIC_PriorityGroup_0 | 0 | 0-15 | 0 bits for pre-emption priority
| | | 4 bits for subpriority
----------------------------------------------------------------------------------------------------------------------------
NVIC_PriorityGroup_1 | 0-1 | 0-7 | 1 bits for pre-emption priority
| | | 3 bits for subpriority
----------------------------------------------------------------------------------------------------------------------------
NVIC_PriorityGroup_2 | 0-3 | 0-3 | 2 bits for pre-emption priority
| | | 2 bits for subpriority
----------------------------------------------------------------------------------------------------------------------------
NVIC_PriorityGroup_3 | 0-7 | 0-1 | 3 bits for pre-emption priority
| | | 1 bits for subpriority
----------------------------------------------------------------------------------------------------------------------------
NVIC_PriorityGroup_4 | 0-15 | 0 | 4 bits for pre-emption priority
| | | 0 bits for subpriority
============================================================================================================================
中斷說明
一、NVIC_PriorityGroupConfig
這個函數隻需要調用一次,多次調用按照最後一次的參數執行
二、優先級說明
1、很重要很重要
沒有組優先級這種東西!!!!!!!!!!
2、名詞解釋
NVIC_IRQChannelPreemptionPriority 搶占式優先級
NVIC_IRQChannelSubPriority 響應式優先級
3、這才是重點
第一條,高搶占式優先級可以打斷低搶占式優先級
第二條,相同搶占式優先級之間,低響應式優先級不會被打斷