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terminate_parallel.c
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C/C++ Source or Header
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1992-09-03
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5KB
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130 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* example may not be published in printed form or distributed with any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.
*
******************************************************************************
*
* Terminate_Parallel.c
*
* This is an example of using a termination array for writes from the parallel
* device. A termination array is set up for the characters Q, E, A and %. The
* EOFMODE flag is set in io_ParFlags to indicate that we want to use a
* termination array by sending the PDCMD_SETPARAMS command to the device.
* Then, a CMD_WRITE command is sent to the device with io_Length set to -1.
*
* The write will terminate when one of the four characters in the
* termination array is sent or when the end of the write buffer has been reached.
*
* 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/io.h>
#include <devices/parallel.h>
#include <clib/exec_protos.h>
#include <clib/alib_protos.h>
#include <stdio.h>
#include <string.h>
#ifdef LATTICE
int CXBRK(void) { return(0); } /* Disable SAS CTRL/C handling */
int chkabort(void) { return(0); } /* really */
#endif
void main(void)
{
struct MsgPort *ParallelMP; /* Define storage for one pointer */
struct IOExtPar *ParallelIO; /* Define storage for one pointer */
struct IOPArray Terminators =
{
0x51454125, /* Q E A % */
0x25252525 /* fill to end with lowest value, must be in descending order */
};
UBYTE *WriteBuffer = "abcdefghijklmEopqrstuvwxyz";
UWORD ctr;
if (ParallelMP=CreatePort(0,0))
{
if (ParallelIO=(struct IOExtPar *)
CreateExtIO(ParallelMP,sizeof(struct IOExtPar)) )
{
if (OpenDevice(PARALLELNAME,0L,(struct IORequest *)ParallelIO,0) )
printf("%s did not open\n",PARALLELNAME);
else
{
/* Tell user what we are doing */
printf("\fWriting until Q, E, A or % encountered in output\n");
/* Set EOF mode flag
* Set the termination array
* Send PDCMD_SETPARAMS to the parallel device
*/
ParallelIO->io_ParFlags |= PARF_EOFMODE;
ParallelIO->io_PTermArray = Terminators;
ParallelIO->IOPar.io_Command = PDCMD_SETPARAMS;
if (DoIO((struct IORequest *)ParallelIO))
printf("Set Params failed "); /* Inform user of error */
else
{
/* Send buffer */
ParallelIO->IOPar.io_Length = -1;
ParallelIO->IOPar.io_Data = WriteBuffer;
ParallelIO->IOPar.io_Command = CMD_WRITE;
if (DoIO((struct IORequest *)ParallelIO))
printf("Error: Write failed\n");
else
{
printf("\nThe total buffer length was: %d.\n"
"The actual number of characters sent: %d\n",
strlen(WriteBuffer),ParallelIO->IOPar.io_Actual);
/* Display all characters sent */
printf("\nThese characters were sent:\n\t\t\tASCII\tHEX\n");
for (ctr=0;ctr<ParallelIO->IOPar.io_Actual;ctr++)
printf("\t\t\t%c\t%x\n",*WriteBuffer,*WriteBuffer++);
}
}
CloseDevice((struct IORequest *)ParallelIO);
}
DeleteExtIO((struct IORequest *)ParallelIO);
}
else
printf("Error: Could not create IORequest\n");
DeletePort(ParallelMP);
}
else
printf("Error: Could not create message port\n");
}