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v36_device_use.c
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C/C++ Source or Header
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1992-09-03
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4KB
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114 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* example may not be published in printed form or distributed with any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.
*
***************************************************************************
*
* V36_Device_Use.c
*
* This is an example of using the serial device.
* First, we will attempt to create a message port with CreateMsgPort()
* Next, we will attempt to create the IORequest with CreateIORequest()
* Then, we will attempt to open the serial device with OpenDevice()
* If successful, we will send the SDCMD_QUERY command to it
* and reverse our steps.
* If we encounter an error at any time, we will gracefully exit.
*
* Compile with SAS C 5.10 lc -cfistq -v -y -L
*
* Requires Kickstart V36 or greater.
*
* Run from CLI only
*/
#include <exec/types.h>
#include <exec/memory.h>
#include <exec/io.h>
#include <exec/libraries.h>
#include <devices/serial.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
extern struct Library *SysBase; /* Use this to check the OS version number */
void main(void)
{
struct MsgPort *SerialMP; /* pointer to our message port */
struct IOExtSer *SerialIO; /* pointer to our IORequest */
/* Check the version of the operating system */
if(SysBase->lib_Version>=36)
{
/* Create the message port */
if (SerialMP=CreateMsgPort())
{
/* Create the IORequest */
if (SerialIO = CreateIORequest(SerialMP,sizeof(struct IOExtSer)))
{
/* Open the serial device */
if (OpenDevice(SERIALNAME,0,(struct IORequest *)SerialIO,0L))
/* Inform user that it could not be opened */
printf("Error: %s did not open\n",SERIALNAME);
else
{
/* device opened, send query command to it */
SerialIO->IOSer.io_Command = SDCMD_QUERY;
if (DoIO((struct IORequest *)SerialIO))
/* Inform user that query failed */
printf("Query failed. Error - %d\n",SerialIO->IOSer.io_Error);
else
/* Print serial device status - see include file for meaning */
printf("\n\tSerial device status: %x\n\n",SerialIO->io_Status);
/* Close the serial device */
CloseDevice((struct IORequest *)SerialIO);
}
/* Delete the IORequest */
DeleteIORequest(SerialIO);
}
else
/* Inform user that the IORequest could be created */
printf("Error: Could create IORequest\n");
/* Delete the message port */
DeleteMsgPort(SerialMP);
}
else
/* Inform user that the message port could not be created */
printf("Error: Could not create message port\n");
}
else
printf("Error: Release 2 (V36) or a later version of the OS is required.\n");
}