vmeBusIntr.rar

/* intGen.c - a program that generates VMEbus interrupt to demonstrate * synchronization among tasks on multiple CPUs. */ /* Copyright 1984-1997 Wind River Systems, Inc. */ /* modification history -------------------- 01b,06nov97,mm added copyright. 01b,17sept97,ram added include files stdio.h, sysLib.h taskLib.h 01a,14jan92,ms written. */ #include "vxWorks.h" #include "intGen.h" #include "stdio.h" #include "sysLib.h" #include "taskLib.h" LOCAL int countdown = 25; /* countdown value */ LOCAL int intNum; LOCAL STATUS intGen (); /***************************************************************************** * intGenDemo - Demo for generating a VMEbus interrupt * * DESCRIPTION * * intGen routine counts down from the initialized countdown value to zero * and then generates VME bus interrupt to synchronize with a task running on * CPU 1. This program is meant to be run on CPU 0. * * The intGen task runs on CPU 0, intSync task runs on CPU 1 * * CONFIGURATION: You need to set/change the value of INTNUM constant * (VMEbus interrupt number to which intSync task's ISR * is connected) and intNum variable (interrupt number * for generating VMEbus interrupt). * * RETURNS: OK or ERROR * * LIMITATION: Some VMEbus Single Board Computer systems can not generate * VMEbus interrupts. Check your hardware and board specific * BSP documents for VMEbus interrupts support. * * EXAMPLE * * The following is an example from CPU 0's VxWorks shell after starting * intSync task from CPU 1: * * -> intGenDemo <intSyncTargetArchType> * where intSyncTargetArchType is the value for the intSync task's target * architecture type. Possible intSyncTargetArchType values and corresponding * architecture types are given below: * * value architecture type * ---- ----------------- * 1 68k * 2 sparc * 3 i960 * * example (to generate a VMEbus interrupt to synchronize with intSync task * running on a Sparc architecture target): * * -> intGenDemo 1 * */ STATUS intGenDemo ( int intSyncTargetArchType /* value: * 1 for 68k architecture targets * 2 for sparc architecure targets * 3 for i960 architecture targets */ ) { int value; int result; intNum = 0; switch (intSyncTargetArchType) { case 1: intNum = 255; break; case 2: intNum = 18; break; case 3: intNum = 18; break; default: printf ("Invalid target architecture type \n"); return (ERROR); } /* do some useful work here */ printf ("\n"); for (value = countdown; value >= 0; value--) { printf ("%2d\r", value); taskDelay (5); } printf ("\n\nREADY for Synchronization\n\n"); printf ("CPU 0: Generating VME bus interrupt at level %d and number %d\n\n", INTLEVEL, intNum); /* generate VMEbus interrupt */ result = intGen (); return (result); } /***************************************************************************** * intGen - generates a VMEbus interrupt * * RETURNS: OK or ERROR * */ STATUS intGen () { /* generate VME bus interrupt. * sysBusIntGen requires hardware support for generating a VME bus * interrupt. */ if (sysBusIntGen (INTLEVEL, intNum) == ERROR) { perror ("Failed to generate interrupt"); return (ERROR); } else { printf ("interrupt generated\n\n"); return (OK); } }