comedi_fc.h revision 790c55415aa31f4c732729f94d2c3a54f7d3bfc2
1/* 2 comedi_fc.h 3 4 This is a place for code driver writers wish to share between 5 two or more drivers. These functions are meant to be used only 6 by drivers, they are NOT part of the kcomedilib API! 7 8 Author: Frank Mori Hess <fmhess@users.sourceforge.net> 9 Copyright (C) 2002 Frank Mori Hess 10 11 This program is free software; you can redistribute it and/or modify 12 it under the terms of the GNU General Public License as published by 13 the Free Software Foundation; either version 2 of the License, or 14 (at your option) any later version. 15 16 This program is distributed in the hope that it will be useful, 17 but WITHOUT ANY WARRANTY; without even the implied warranty of 18 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 19 GNU General Public License for more details. 20 21 You should have received a copy of the GNU General Public License 22 along with this program; if not, write to the Free Software 23 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. 24 25************************************************************************/ 26 27#ifndef _COMEDI_FC_H 28#define _COMEDI_FC_H 29 30#include "../comedidev.h" 31 32/* Writes an array of data points to comedi's buffer */ 33extern unsigned int cfc_write_array_to_buffer(comedi_subdevice *subd, 34 void *data, 35 unsigned int num_bytes); 36 37static inline unsigned int cfc_write_to_buffer(comedi_subdevice *subd, 38 short data) 39{ 40 return cfc_write_array_to_buffer(subd, &data, sizeof(data)); 41}; 42 43static inline unsigned int cfc_write_long_to_buffer(comedi_subdevice *subd, 44 unsigned int data) 45{ 46 return cfc_write_array_to_buffer(subd, &data, sizeof(data)); 47}; 48 49extern unsigned int cfc_read_array_from_buffer(comedi_subdevice *subd, 50 void *data, 51 unsigned int num_bytes); 52 53extern unsigned int cfc_handle_events(comedi_device *dev, 54 comedi_subdevice *subd); 55 56static inline unsigned int cfc_bytes_per_scan(comedi_subdevice *subd) 57{ 58 int num_samples; 59 int bits_per_sample; 60 61 switch (subd->type) { 62 case COMEDI_SUBD_DI: 63 case COMEDI_SUBD_DO: 64 case COMEDI_SUBD_DIO: 65 bits_per_sample = 8 * bytes_per_sample(subd); 66 num_samples = (subd->async->cmd.chanlist_len + 67 bits_per_sample - 1) / bits_per_sample; 68 break; 69 default: 70 num_samples = subd->async->cmd.chanlist_len; 71 break; 72 } 73 return num_samples * bytes_per_sample(subd); 74} 75 76#endif /* _COMEDI_FC_H */ 77