www.pudn.com > FX GPIF.zip > int0.c

//----------------------------------------------------------------------------- 
//  File:    int0.c 
//  Contents:  ISR for INT0# pin, used by slave to issue ZERO LENGTH PACKET 
//            EZUSB FX Slave FIFO firmware to "pass-on" USB pkts to/from master. 
//  Copyright (c) 2001 Cypress Semiconductor All rights reserved 
//----------------------------------------------------------------------------- 
#include "ezusb.h" 
#include "ezregs.h" 
#include "Fx.h" 
 
extern BOOL zerolenpkt; 
 
void int0( void ) interrupt 0 
{ // processor vectors here when slave asserts zerolenpkt 
  // the "using: keyword could make this more efficient 
  zerolenpkt = 1; 
  EX0 = 0;                      // disable INT0# pin ISR 
 
  // foreground clears this flag and (re)enables ISR... 
  // ...an idle system will service this event in ~8usec 
  // ...a busy system could take ~20usec or so... 
}