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/*
comedi_fc.h
This is a place for code driver writers wish to share between
two or more drivers. These functions are meant to be used only
by drivers, they are NOT part of the kcomedilib API!
Author: Frank Mori Hess <fmhess@users.sourceforge.net>
Copyright (C) 2002 Frank Mori Hess
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.
************************************************************************/
#ifndef _COMEDI_FC_H
#define _COMEDI_FC_H
#include "../comedidev.h"
/* Writes an array of data points to comedi's buffer */
extern unsigned int cfc_write_array_to_buffer(comedi_subdevice *subd,
void *data,
unsigned int num_bytes);
static inline unsigned int cfc_write_to_buffer(comedi_subdevice *subd,
sampl_t data)
{
return cfc_write_array_to_buffer(subd, &data, sizeof(data));
};
static inline unsigned int cfc_write_long_to_buffer(comedi_subdevice *subd,
lsampl_t data)
{
return cfc_write_array_to_buffer(subd, &data, sizeof(data));
};
extern unsigned int cfc_read_array_from_buffer(comedi_subdevice *subd,
void *data,
unsigned int num_bytes);
extern unsigned int cfc_handle_events(comedi_device *dev,
comedi_subdevice *subd);
static inline unsigned int cfc_bytes_per_scan(comedi_subdevice *subd)
{
int num_samples;
int bits_per_sample;
switch (subd->type) {
case COMEDI_SUBD_DI:
case COMEDI_SUBD_DO:
case COMEDI_SUBD_DIO:
bits_per_sample = 8 * bytes_per_sample(subd);
num_samples = (subd->async->cmd.chanlist_len +
bits_per_sample - 1) / bits_per_sample;
break;
default:
num_samples = subd->async->cmd.chanlist_len;
break;
}
return num_samples * bytes_per_sample(subd);
}
#endif /* _COMEDI_FC_H */
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