94 lines
2.2 KiB
C
94 lines
2.2 KiB
C
/*
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lib/sv.c
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comedi library routines - sv section
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COMEDI - Linux Control and Measurement Device Interface
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Copyright (C) 1997-8 David A. Schleef <ds@stm.lbl.gov>
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include <libinternal.h>
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#include <stdio.h>
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#include <math.h>
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#include <stdlib.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <sys/ioctl.h>
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#include <errno.h>
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#include <comedi.h>
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#include <string.h>
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#define BUFSZ 100
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int comedi_timed_1chan(comedi_t *dev,unsigned int subd,unsigned int chan,unsigned int range,
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unsigned int aref,double freq,unsigned int n_samples,double *data)
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{
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comedi_trig t;
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double act_freq;
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sampl_t *buffer;
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comedi_range *the_range;
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unsigned int maxdata;
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int i,n,m;
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if(!valid_chan(dev,subd,chan))return -1;
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if(!data)return -1;
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memset(&t,0,sizeof(t));
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/* check range */
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the_range=comedi_get_range(dev,subd,chan,range);
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maxdata=comedi_get_maxdata(dev,subd,chan);
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chan=CR_PACK(chan,range,aref);
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t.subdev=subd;
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t.mode=2;
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t.n_chan=1;
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t.chanlist=&chan;
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t.n=n_samples;
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comedi_get_timer(dev,subd,freq,&t.trigvar,&act_freq);
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t.trigvar1=1;
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buffer=malloc(sizeof(sampl_t)*BUFSZ);
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if(!buffer)return -1;
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comedi_trigger(dev,&t);
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n=0;
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while(n<n_samples){
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m=n_samples-n;
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if(m>BUFSZ)m=BUFSZ;
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if((m=read(dev->fd,buffer,m*sizeof(sampl_t)))<0){
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/* ack! */
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return -1;
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}
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m/=sizeof(sampl_t);
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for(i=0;i<m;i++){
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data[n+i]=comedi_to_phys(buffer[i],the_range,maxdata);
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}
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n+=m;
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}
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free(buffer);
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return 0;
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}
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