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#include <stdio.h>
#include <comedilib.h>
#include <fcntl.h>
#include <unistd.h>
#include <sys/ioctl.h>
#include <errno.h>
#include <getopt.h>
#include <ctype.h>
#include <math.h>
#include <sys/time.h>
#include <string.h>
#include "comedi_test.h"
static int do_continuous(int multiplier);
#define BUFSZ 10000
int test_cmd_continuous(void)
{
int mult;
unsigned int flags = comedi_get_subdevice_flags(device,subdevice);
/* attempt to make subdevice the current 'read' subdevice */
if(flags&SDF_CMD_READ) comedi_set_read_subdevice(device,subdevice);
if(!(flags&SDF_CMD) || (comedi_get_read_subdevice(device)!=subdevice)){
printf("not applicable\n");
return 0;
}
/* as if doing _one_ infinite loop wasn't slow enough,
* we loop through with higher and higher multipliers,
* in case the test fails because of latency problems */
for(mult=1;mult<1024;mult*=2){
do_continuous(mult);
}
return 0;
}
static int do_continuous(int multiplier)
{
comedi_cmd cmd;
char buf[BUFSZ];
unsigned int chanlist[1];
int go;
int total=0;
int ret;
int chunks=0;
unsigned long total_secs = 0;
struct timeval tv,start_tv;
if(comedi_get_cmd_generic_timed(device,subdevice, &cmd, 1, 1)<0){
printf(" not supported\n");
return 0;
}
if(realtime)cmd.flags |= TRIG_RT;
cmd.chanlist = chanlist;
cmd.scan_end_arg = 1;
cmd.stop_src = TRIG_NONE;
cmd.stop_arg = 0;
cmd.chanlist_len = 1;
chanlist[0] = CR_PACK(0,0,0);
// slow down a bit
cmd.scan_begin_arg *= multiplier;
printf("multiplier=%d, scan_begin_arg=%d\n",
multiplier,
cmd.scan_begin_arg);
ret=comedi_command(device,&cmd);
if(ret<0){
perror("comedi_command");
}else{
printf("ret==%d\n",ret);
}
gettimeofday(&start_tv,NULL);
go=1;
while(go){
ret = read(comedi_fileno(device),buf,BUFSZ);
if(ret<0){
if(errno==EAGAIN){
usleep(10000);
}else{
go = 0;
perror("read");
}
}else if(ret==0){
go = 0;
}else{
total += ret;
chunks++;
gettimeofday(&tv,NULL);
tv.tv_sec-=start_tv.tv_sec;
tv.tv_usec-=start_tv.tv_usec;
if(tv.tv_usec<0){
tv.tv_usec+=1000000;
tv.tv_sec--;
}
if(tv.tv_sec>total_secs){
double t;
t=tv.tv_sec+1e-6*tv.tv_usec;
printf("%0.3f %d (%g) %d (%g)\n",
t,
chunks,chunks/t,
total,total/t);
total_secs++;
}
}
}
{
double t;
t=tv.tv_sec+1e-6*tv.tv_usec;
printf("end: %0.3f %d (%g) %d (%g)\n",
t,
chunks,chunks/t,
total,total/t);
}
return 0;
}
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