1 typedef struct
 2 {
 3   uint32_t EXTI_Line;               /*!< Specifies the EXTI lines to be enabled or disabled.
 4                                          This parameter can be any combination value of @ref EXTI_Lines */
 5
 6   EXTIMode_TypeDef EXTI_Mode;       /*!< Specifies the mode for the EXTI lines.
 7                                          This parameter can be a value of @ref EXTIMode_TypeDef */
 8
 9   EXTITrigger_TypeDef EXTI_Trigger; /*!< Specifies the trigger signal active edge for the EXTI lines.
10                                          This parameter can be a value of @ref EXTITrigger_TypeDef */
11
12   FunctionalState EXTI_LineCmd;     /*!< Specifies the new state of the selected EXTI lines.
13                                          This parameter can be set either to ENABLE or DISABLE */
14 }EXTI_InitTypeDef;

 1 /**
 2   * @brief  Configures the priority grouping: pre-emption priority and subpriority.
 3   * @param  NVIC_PriorityGroup: specifies the priority grouping bits length.
 4   *   This parameter can be one of the following values:
 5   *     @arg NVIC_PriorityGroup_0: 0 bits for pre-emption priority
 6   *                                4 bits for subpriority
 7   *     @arg NVIC_PriorityGroup_1: 1 bits for pre-emption priority
 8   *                                3 bits for subpriority
 9   *     @arg NVIC_PriorityGroup_2: 2 bits for pre-emption priority
10   *                                2 bits for subpriority
11   *     @arg NVIC_PriorityGroup_3: 3 bits for pre-emption priority
12   *                                1 bits for subpriority
13   *     @arg NVIC_PriorityGroup_4: 4 bits for pre-emption priority
14   *                                0 bits for subpriority
15   * @note   When the NVIC_PriorityGroup_0 is selected, IRQ pre-emption is no more possible.
16   *         The pending IRQ priority will be managed only by the subpriority.
17   * @retval None
18   */

 1 typedef struct
 2 {
 3   uint8_t NVIC_IRQChannel;                    /*!< Specifies the IRQ channel to be enabled or disabled.
 4                                                    This parameter can be an enumerator of @ref IRQn_Type
 5                                                    enumeration (For the complete STM32 Devices IRQ Channels
 6                                                    list, please refer to stm32f4xx.h file) */
 7
 8   uint8_t NVIC_IRQChannelPreemptionPriority;  /*!< Specifies the pre-emption priority for the IRQ channel
 9                                                    specified in NVIC_IRQChannel. This parameter can be a value
10                                                    between 0 and 15 as described in the table @ref MISC_NVIC_Priority_Table
11                                                    A lower priority value indicates a higher priority */
12
13   uint8_t NVIC_IRQChannelSubPriority;         /*!< Specifies the subpriority level for the IRQ channel specified
14                                                    in NVIC_IRQChannel. This parameter can be a value
15                                                    between 0 and 15 as described in the table @ref MISC_NVIC_Priority_Table
16                                                    A lower priority value indicates a higher priority */
17
18   FunctionalState NVIC_IRQChannelCmd;         /*!< Specifies whether the IRQ channel defined in NVIC_IRQChannel
19                                                    will be enabled or disabled.
20                                                    This parameter can be set either to ENABLE or DISABLE */
21 } NVIC_InitTypeDef;

1 NVIC_InitTypeDef NVIC_InitStructure;
2     NVIC_PriorityGroupConfig(NVIC_PriorityGroup_1);
3     NVIC_InitStructure.NVIC_IRQChannel = EXTI9_5_IRQn;
4     NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
5     NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
6     NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
7     NVIC_Init(&NVIC_InitStructure);