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- ;/* DeviceUse.c - Execute me to compile me with SAS C 5.10
- LC -b1 -cfistq -v -y -j73 DeviceUse.c
- Blink FROM LIB:c.o,DeviceUse.o TO DeviceUse LIBRARY LIB:LC.lib,LIB:Amiga.lib
- quit
-
- /* DeviceUse.c - an example of using an Amiga device (here, serial device) */
- /* - attempt to create a message port with CreatePort() (from amiga.lib) */
- /* - attempt to create the I/O request with CreateExtIO() (from amiga.lib) */
- /* - attempt to open the serial device with Exec OpenDevice() */
- /* */
- /* If successful, use the serial command SDCMD_QUERY, then reverse our steps. */
- /* If we encounter an error at any time, we will gracefully exit. Note that */
- /* applications which require at least V37 OS should use the Exec functions */
- /* CreateMsgPort()/DeleteMsgPort() and CreateIORequest()/DeleteIORequest() */
- /* instead of the similar amiga.lib functions which are used in this example. */
-
- /*
- 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: Libraries", 3rd Edition,
- published by Addison-Wesley (ISBN 0-201-56774-1).
-
- The "Amiga ROM Kernel Reference Manual: Libraries" 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- example may not be published in printed form or distributed with any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.
- */
-
- #include <exec/types.h>
- #include <exec/memory.h>
- #include <exec/io.h>
- #include <devices/serial.h>
-
- #include <clib/exec_protos.h> /* Prototypes for Exec library functions */
- #include <clib/alib_protos.h> /* Prototypes for amiga.lib functions */
-
- #include <stdio.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 *serialMP; /* for pointer to our message port */
- struct IOExtSer *serialIO; /* for pointer to our I/O request */
- struct IOExtSer *reply; /* for use with GetMsg */
-
- if (serialMP=CreatePort(NULL,NULL)) /* Create the message port. */
- {
- /* Create the I/O request. Note that <devices/serial.h> defines the type */
- /* of IORequest required by the serial device--an IOExtSer. Many devices */
- /* require specialized extended IO requests which start with an embedded */
- /* struct IORequest. The generic Exec and amiga.lib device IO functions */
- /* are prototyped for IORequest, so some pointer casting is necessary. */
-
- if (serialIO = (struct IOExtSer *)CreateExtIO(serialMP,sizeof(struct IOExtSer)))
- {
- /* Open the serial device (non-zero return value means failure here). */
- if (OpenDevice( SERIALNAME, 0, (struct IORequest *)serialIO, 0L))
- printf("Error: %s did not open\n",SERIALNAME);
- else
- {
- /* Device is open */ /* DoIO - demonstrates synchronous */
- serialIO->IOSer.io_Command = SDCMD_QUERY; /* device use, returns error or 0. */
- if (DoIO((struct IORequest *)serialIO))
- printf("Query failed. Error - %d\n",serialIO->IOSer.io_Error);
- else
- /* Print serial device status - see include file for meaning */
- /* Note that with DoIO, the Wait and GetMsg are done by Exec */
- printf("Serial device status: $%x\n\n",serialIO->io_Status);
-
- serialIO->IOSer.io_Command = SDCMD_QUERY; /* SendIO - demonstrates asynchronous */
- SendIO((struct IORequest *)serialIO); /* device use (returns immediately). */
-
- /* We could do other things here while the query is being done. */
- /* And to manage our asynchronous device IO: */
- /* - we can CheckIO(serialIO) to check for completion */
- /* - we can AbortIO(serialIO) to abort the command */
- /* - we can WaitPort(serialMP) to wait for any serial port reply */
- /* OR we can WaitIO(serialIO) to wait for this specific IO request */
- /* OR we can Wait(1L << serialMP_>mp_SigBit) for reply port signal */
-
- Wait(1L << serialMP->mp_SigBit);
-
- while(reply = (struct IOExtSer *)GetMsg(serialMP))
- { /* Since we sent out only one serialIO request the while loop is */
- /* not really needed--we only expect one reply to our one query */
- /* command, and the reply message pointer returned by GetMsg() */
- /* will just be another pointer to our one serialIO request. */
- /* With Wait() or WaitPort(), you must GetMsg() the message. */
- if(reply->IOSer.io_Error)
- printf("Query failed. Error - %d\n",reply->IOSer.io_Error);
- else
- printf("Serial device status: $%x\n\n",reply->io_Status);
- }
- CloseDevice((struct IORequest *)serialIO); /* Close the serial device. */
- }
- DeleteExtIO(serialIO); /* Delete the I/O request. */
- }
- else printf("Error: Could create I/O request\n"); /* Inform user that the I/O */
- /* request could be created. */
- DeletePort(serialMP); /* Delete the message port. */
- }
- else printf("Error: Could not create message port\n"); /* Inform user that the message*/
- } /* port could not be created. */
-