io.c

/*
 * Copyright © 1999/2000 by Henning Zabel <henning@uni-paderborn.de>
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the
 * Free Software Foundation; either version 2 of the License, or (at your
 * option) any later version.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
 * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software Foundation,
 * Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */
 
/*
 * gphoto driver for the Mustek MDC800 Digital Camera. The driver 
 * supports rs232 and USB. It automatically detects which Kernelnode
 * is used.
 */
 
/*
 * Implements cummunication-core :
 *
 * Sending commands and receiving data
 */

#include <gphoto2/gphoto2-library.h>
#include <gphoto2/gphoto2-result.h>


#include "io.h"
#include <string.h>
#include <sys/time.h>
#include "print.h"
#include "rs232.h"
#include "usb.h"
#include "mdc800_spec.h"

/*
 * Send a Command to the Camera. It is unimportent wether this
 * is a USB or a RS232 Command. The Function implements an automatic
 * retry of a failed command.
 *
 * The Function will only be used in this Layer, execpt on probing
 * the Baudrate of Rs232.
 * if quiet is true, the function won't print notes
 */
int mdc800_io_sendCommand_with_retry (GPPort *port,char* command, char* buffer, int length, int maxtries,int quiet)
{
      int try=0;
      int ret=GP_OK;
      
      while (try < maxtries)
      {
              usleep(MDC800_DEFAULT_COMMAND_RETRY_DELAY*1000);
            if (port->type == GP_PORT_USB)
                  ret=mdc800_usb_sendCommand(port,command, buffer, length );
            else
                  ret=mdc800_rs232_sendCommand(port, command, buffer, length);
            if (ret==GP_OK)
                  return GP_OK;
            try++;
      }
      if (!quiet)
      {
            printCoreNote ("\nCamera is not responding (Maybe off?)\n");
            printCoreNote ("giving it up after %i times.\n\n", try);
      }
      return GP_ERROR_IO;
}


/*
 * sends a command and receives the answer to this
 * buffer: Strores the answer
 * length: length of answer or null
 */
int mdc800_io_sendCommand (GPPort*port,char commandid,char par1,char par2,char par3, char* buffer, int length)
{
      char command [8];
      command[0]=COMMAND_BEGIN;
      command[1]=commandid;
      command[2]=par1;
      command[3]=par2;
      command[4]=par3;
      command[5]=COMMAND_END;
      command[6]=0;
      command[7]=0;
      return mdc800_io_sendCommand_with_retry (port,command,buffer,length, MDC800_DEFAULT_COMMAND_RETRY,0);
}

/*
 * Helper function for rs232 and usb
 * It returns a timeout for the specified command
 */
int mdc800_io_getCommandTimeout (char command)
{
      switch ((unsigned char) command)
      {
            case COMMAND_SET_STORAGE_SOURCE:
            case COMMAND_SET_TARGET:
            case COMMAND_SET_CAMERA_MODE:
            case COMMAND_DELETE_IMAGE:
                  return MDC800_LONG_TIMEOUT;
                  
            case COMMAND_TAKE_PICTURE:
            case COMMAND_PLAYBACK_IMAGE:
            case COMMAND_SET_PLAYBACK_MODE:
                  return MDC800_TAKE_PICTURE_TIMEOUT;
      }
      return MDC800_DEFAULT_TIMEOUT;
}