2.41 Enhanced Vectored Interrupt Controller (EVIC)
The PIC32 devices generate interrupt requests in response to interrupt events from peripheral modules. The Interrupt Controller module exists outside of the CPU and prioritizes the interrupt events before presenting them to the CPU.
The Interrupt Controller module includes the following features:
-
Up to 213 interrupt sources and vectors with dedicated programmable offsets, eliminating the need for redirection
-
Single and multi-vector mode operations
-
Five external interrupts with edge polarity control
-
Interrupt proximity timer
-
Seven user-selectable priority levels for each vector
-
Four user-selectable sub-priority levels within each priority
-
Seven shadow register sets that can be used for any priority level, eliminating software context switch and reducing interrupt latency
-
Software can generate any interrupt
Library Interface
Enhanced Vectored Interrupt Controller peripheral library provides the following interfaces:
Functions
| Name | Description |
|---|---|
| EVIC_Initialize | Configures and initializes the interrupt subsystem |
| EVIC_SourceEnable | Enables the interrupt source |
| EVIC_SourceDisable | Disables the interrupt source |
| EVIC_SourceIsEnabled | Gets the enable state of the interrupt source |
| EVIC_SourceStatusGet | Returns the status of the interrupt flag for the selected source |
| EVIC_SourceStatusSet | Sets the status of the interrupt flag for the selected source |
| EVIC_SourceStatusClear | Clears the status of the interrupt flag for the selected source |
| EVIC_ExternalInterruptCallbackRegister | Allows application to register callback for every external interrupt pin |
| EVIC_ExternalInterruptEnable | Enables external interrupt on selected external interrupt pins |
| EVIC_ExternalInterruptDisable | Disables external interrupt on selected external interrupt pins |
Data types and constants
| Name | Type | Description |
|---|---|---|
| INT_SOURCE | Enum | Identifies interrupt sources |
| EXTERNAL_INT_PIN | Enum | Identifies the active external interrupt pins |
| EXTERNAL_INT_PIN_CALLBACK | Typedef | Pointer to a external Pin-Event handler function |