(XC32) How do I write a Interrupt Service Routine (ISR) for a particular interrupt vector for PIC32 devices using ISR macros?

In MPLAB® XC32, Interrupt Service Routines (ISRs) can be written using the following macros:

  • __ISR
  • __ISR_AT_VECTOR

The __ISR macro will assign the vector-number location to a specific Interrupt Priority Level (IPL). This will place a jump to the interrupt handler at the associated vector location.

Example

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The __ISR_AT_VECTOR(v, IPL) will place the entire interrupt handler at the vector location and associate it with the software-assigned interrupt priority. Software should make sure that the vector spacing is set to accommodate the size of the handler.

Example

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The attribs.h header file contains macro definitions for __ISR and __ISR_AT_VECTOR. Macro for interrupt vector number can be found in device specific header file under the folder <Compiler-DIR>/pic32mx/include/proc.

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