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MPLAB ? C32 C Compiler User’s Guide
# pragma interrupt function-name ipl n [ vector [ @ ] vector-number [,
vector-number-list ]]
# pragma interrupt function-name
single [ vector [ @ ] 0
Where n is in the range of 0..7, inclusive. The ipl x specifier may be all uppercase or
all lowercase.
The function definition for a handler function indicated by an interrupt pragma must
follow in the same translation unit as the pragma itself.
The interrupt attribute will also indicate that a function definition is an interrupt
handler. It is functionally equivalent to the interrupt pragma.
For example, the definitions of foo below both indicate that it is an interrupt handler
function for an interrupt of priority 4.
#pragma interrupt foo ipl4
void foo (void)
is functionally equivalent to
void __attribute__ ((interrupt(ipl4))) foo (void)
3.4
ASSOCIATING A HANDLER FUNCTION WITH AN EXCEPTION VECTOR
There are 64 exception vectors, numbered 0..63 inclusive. Each interrupt source is
mapped to an exception vector as specified in the device data sheet. By default, four
words of space are reserved at each vector address for a dispatch to the handler
function for that exception source.
An interrupt handler function can be associated with an interrupt vector either as the
target of a dispatch function located at the exception vector address, or as being
located directly at the exception vector address. A single handler function can be the
target of multiple dispatch functions.
The association of a handler function to one or more exception vector addresses is
specified via a clause of the interrupt pragma, a separate vector pragma, or a vector
attribute on the function declaration.
3.4.1
Interrupt Pragma Clause
The interrupt pragma has an optional vector clause following the priority specifier.
# pragma interrupt function-name ipl-specifier [ vector
[ @ ] vector-number [, vector-number-list ]]
A dispatch function targeting the specified handler function will be created at the
exception vector address for the specified vector numbers. If the first vector number is
specified with a preceding “@” symbol, the handler function itself will be located there
directly.
For example, the following pragma 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. A dispatch function targeting foo will be created at exception vector address
34.
#pragma interrupt foo ipl4 vector @54, 34
The following pragma specifies that function bar will be created as an interrupt handler
function of priority five. bar will be located in general purpose program memory (.text
section). A dispatch function targeting bar will be created at exception vector address
23.
#pragma interrupt bar ipl5 vector 23
DS51686A-page 48
? 2007 Microchip Technology Inc.
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