HAL EXTI How to Use

group EXTI_How_To_Use

How to use the EXTI HAL module driver

The EXTI HAL driver can be used as follows:

When a configurable EXTI line is used as an event input:

• Instantiate an EXTI handle and associate it to a configurable EXTI line using HAL_EXTI_Init().

• Configure the configurable EXTI line identified by the given handle using HAL_EXTI_SetConfig().

• Register a user-defined callback for the configurable EXTI line identified by the handle using HAL_EXTI_RegisterTriggerCallback(), or use the default callback function HAL_EXTI_TriggerCallback().

• Enable the configurable EXTI line for interrupt, event, or both modes using HAL_EXTI_Enable().

• Retrieve pending events for the configurable EXTI line using HAL_EXTI_GetPending() and clear them using HAL_EXTI_ClearPending().

• Disable EXTI modes using HAL_EXTI_Disable().

When a direct EXTI line is used as an event input:

• Instantiate an EXTI handle and associate it to a direct EXTI line using HAL_EXTI_Init().

• Enable the direct EXTI line for interrupt, event, or both modes using HAL_EXTI_Enable().

• Disable EXTI modes using HAL_EXTI_Disable().

When generating a software interrupt on an EXTI line:

• Instantiate an EXTI handle and associate it to an EXTI line using HAL_EXTI_Init().

• Register a user-defined callback for an EXTI line identified by the handle using HAL_EXTI_RegisterTriggerCallback(), or use the default callback function HAL_EXTI_TriggerCallback()

• Generate the software interrupt using HAL_EXTI_GenerateSWI().

• Retrieve pending software interrupt events using HAL_EXTI_GetPending() and clear them using HAL_EXTI_ClearPending().

The HAL EXTI driver allows management of EXTI security attributes:

• Set the privilege access level attribute for EXTI line(s) using HAL_EXTI_SetPrivAttr().

• Get the privilege access level attribute for an EXTI line using HAL_EXTI_GetPrivAttr().