/*
   * 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 I/O request 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 <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

  void main(void)
  {
  struct MsgPort *SerialMP;       /* pointer to our message port */
  struct IOExtSer *SerialIO;      /* pointer to our I/O request */

      /* Create the message port */
  if (SerialMP=CreateMsgPort())
      {
          /* Create the I/O request */
      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 I/O request */
          DeleteIORequest(SerialIO);
          }
      else
          /* Inform user that the I/O request could be created */
          printf("Error: Could create I/O request\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");
  }

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