SW006015【PDF 53/120 页】C COMPILER MPLAB C32

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Interrupts

3.4.2

Vector Pragma

The vector pragma creates one or more dispatch functions targeting the indicated

function. For target functions specified with the interrupt pragma, this functions as

if the vector clause had been used. The target function of a vector pragma can be

any function, including external functions implemented in assembly or by other means.

# pragma vector function-name vector vector-number [,

vector-number-list ]

The following pragma defines a dispatch function targeting foo at exception vector

address 54.

#pragma vector foo 54

3.4.3

Vector Attribute

A handler function can be associated with one or more exception vector addresses via

an attribute. The at_vector attribute indicates that the handler function should itself

be placed at the exception vector address. The vector attribute indicates that a

dispatch function should be created at the exception vector address(es).

For example, the following declaration specifies that function foo will be created as an

interrupt handler function of priority four. foo will be located at the address of exception

vector 54.

void __attribute__ ((interrupt(ipl4))) __attribute__ ((at_vector(54)))

foo (void)

The following declaration specifies that function foo will be created as an interrupt

handler function of priority four. Define dispatch functions targeting foo at exception

vector addresses 52 and 53.

void __attribute__ ((interrupt(ipl4))) __attribute__ ((vector(53,

52))) foo (void)

3.5

EXCEPTION HANDLERS

The PIC32MX devices also have two exception vectors for non-interrupt exceptions.

These exceptions are grouped into bootstrap exceptions and general exceptions.

3.5.1

Bootstrap Exception

A reset exception is any exception which occurs while bootstrap code is running

( Status BEV =1 ). All reset exceptions are vectored to 0xBFC00380 .

At this location the MPLAB C32 toolchain places a branch instruction targeting a

function named _bootstrap_exception_handler() . In the standard library, a

default weak version of this function is provided which merely goes into an infinite loop.

If the user application provides an implementation of

_bootstrap_exception_handler() , that implementation will be used instead.

3.5.2

General Exception

A general exception is any non-interrupt exception which occurs during program

execution outside of bootstrap code ( Status BEV =0 ). General exceptions are vectored

to offset 0x180 from EBase .

At this location the MPLAB C32 toolchain places a branch instruction targeting a

function named _general_exception_context() . The provided implementation

of this function saves context, calls an application handler function, restores context

and performs a return from exception instruction. The context saved is the hi and lo

registers and all general purpose registers except s0-s8 , which are defined to be

preserved by all called functions and so are not necessary to actively save again here.

? 2007 Microchip Technology Inc.

DS51686A-page 49

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