/*
 * 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);
        }
    else
          printf("Error: Could not allocate keymatrix memory\");

      CloseDevice((struct IORequest *)KeyIO);
      }
      else
        printf("Error: Could not open keyboard.device\n");

    DeleteExtIO((struct IORequest *)KeyIO);
    }
    else
      printf("Error: Could not create I/O request\n");

  DeletePort(KeyMP);
  }
  else
    printf("Error: Could not create message port\n");
}

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