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read_keyboard_matrix.c
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C/C++ Source or Header
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1992-09-03
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/*
* 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* example may not be published in printed form or distributed with any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_Keyboard_Matrix.c
*
* Compile with SAS C 5.10 lc -b1 -cfistq -v -y -L
*
* Run from CLI only
*/
#include <exec/types.h>
#include <exec/memory.h>
#include <exec/libraries.h>
#include <dos/dos.h>
#include <devices/keyboard.h>
#include <clib/exec_protos.h>
#include <clib/alib_protos.h>
#include <stdio.h>
#ifdef LATTICE
int CXBRK(void) { return(0); } /* Disable SAS CTRL/C handling */
int chkabort(void) { return(0); } /* really */
#endif
/*
* There are keycodes from 0x00 to 0x7F, so the matrix needs to be
* of 0x80 bits in size, or 0x80/8 which is 0x10 or 16 bytes...
*/
#define MATRIX_SIZE 16L
/*
* This assembles the matrix for display that translates directly
* to the RAW key value of the key that is up or down
*/
void Display_Matrix(UBYTE *keyMatrix)
{
SHORT bitcount;
SHORT bytecount;
SHORT mask;
USHORT twobyte;
printf("\n 0 1 2 3 4 5 6 7");
printf("\n +-----------------");
for (bitcount=0;bitcount<16;bitcount++)
{
printf("\n%x |",bitcount);
mask=1 << bitcount;
for (bytecount=0;bytecount<16;bytecount+=2)
{
twobyte=keyMatrix[bytecount] | (keyMatrix[bytecount+1] << 8);
if (twobyte & mask)
printf(" *");
else
printf(" -");
}
}
printf("\n\n");
}
VOID main(int argc, char *argv[])
{
extern struct Library *SysBase;
struct IOStdReq *KeyIO;
struct MsgPort *KeyMP;
UBYTE *keyMatrix;
if (KeyMP=CreatePort(NULL,NULL))
{
if (KeyIO=(struct IOStdReq *)
CreateExtIO(KeyMP,sizeof(struct IOStdReq)))
{
if (!OpenDevice("keyboard.device",NULL,(struct IORequest *)KeyIO,NULL))
{
if (keyMatrix=AllocMem(MATRIX_SIZE,MEMF_PUBLIC|MEMF_CLEAR))
{
KeyIO->io_Command=KBD_READMATRIX;
KeyIO->io_Data=(APTR)keyMatrix;
KeyIO->io_Length= SysBase->lib_Version >= 36 ? MATRIX_SIZE : 13;
DoIO((struct IORequest *)KeyIO);
/* Check for CLI startup... */
if (argc)
Display_Matrix(keyMatrix);
FreeMem(keyMatrix,MATRIX_SIZE);
}
CloseDevice((struct IORequest *)KeyIO);
}
DeleteExtIO((struct IORequest *)KeyIO);
}
DeletePort(KeyMP);
}
}