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Read_Potinp.c
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C/C++ Source or Header
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1992-09-03
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3KB
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111 lines
/*
* Copyright (c) 1992 Commodore-Amiga, Inc.
*
* This example is provided in electronic form by Commodore-Amiga, Inc. for
* use with the "Amiga ROM Kernel Reference Manual: Devices", 3rd Edition,
* published by Addison-Wesley (ISBN 0-201-56775-X).
*
* The "Amiga ROM Kernel Reference Manual: Devices" contains additional
* information on the correct usage of the techniques and operating system
* functions presented in these examples. The source and executable code
* of these examples may only be distributed in free electronic form, via
* bulletin board or as part of a fully non-commercial and freely
* redistributable diskette. Both the source and executable code (including
* comments) must be included, without modification, in any copy. This
* example may not be published in printed form or distributed with any
* commercial product. However, the programming techniques and support
* routines set forth in these examples may be used in the development
* of original executable software products for Commodore Amiga computers.
*
* All other rights reserved.
*
* This example is provided "as-is" and is subject to change; no
* warranties are made. All use is at your own risk. No liability or
* responsibility is assumed.
*
*****************************************************************************
*
*
* Read_Potinp.c
*
* An example of using the potgo.resource to read pins 9 and 5 of
* port 1 (the non-mouse port). This bypasses the gameport.device.
* When the right or middle button on a mouse plugged into port 1 is pressed,
* the read value will change.
*
* Use of port 0 (mouse) is unaffected.
*
* Compile with SAS 5.10 lc -b1 -cfistq -v -y -L
*
* Run from CLI only
*/
#include <exec/types.h>
#include <exec/memory.h>
#include <dos/dos.h>
#include <resources/potgo.h>
#include <hardware/custom.h>
#include <clib/exec_protos.h>
#include <clib/potgo_protos.h>
#include <stdio.h>
#ifdef LATTICE
int CXBRK(void) {return(0);} /* Disable SAS Ctrl-C checking */
int chkabort(void) { return(0); } /* really */
#endif
struct PotgoBase *PotgoBase;
ULONG potbits;
UWORD value;
#define UNLESS(x) if(!(x))
#define UNTIL(x) while(!(x))
#define OUTRY 1L<<15
#define DATRY 1L<<14
#define OUTRX 1L<<13
#define DATRX 1L<<12
extern struct Custom far custom;
void main(int argc,char **argv)
{
UNLESS (PotgoBase=(struct PotgoBase *)OpenResource("potgo.resource"))
return;
potbits=AllocPotBits(OUTRY|DATRY|OUTRX|DATRX);
/* Get the bits for the right and middle mouse buttons on the alternate mouse port. */
if (potbits != (OUTRY|DATRY|OUTRX|DATRX))
{
printf("Pot bits are already allocated! %lx\n",potbits);
FreePotBits(potbits);
return;
}
/* Set all ones in the register (masked by potbits) */
WritePotgo(0xFFFFFFFFL,potbits);
printf("\nPlug a mouse into the second port. This program will indicate when\n");
printf("the right or middle button (if the mouse is so equipped) is pressed.\n");
printf("Stop the program with Control-C. Press return now to begin.\n");
getchar();
UNTIL (SIGBREAKF_CTRL_C & SetSignal(0L,0L))
/* until CTRL-C is pressed */
{
/* Read word at $DFF016 */
value = custom.potinp;
/* Show what was read (restricted to our allocated bits) */
printf("POTINP = $%lx\n",value & potbits);
}
FreePotBits(potbits);
}