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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 get_chunks_per_length(int length);
#define BUFSZ 10000
int test_cmd_fifo_depth_check(void)
{
int len;
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;
}
for(len=64;len<65536;len<<=1){
printf("%d, %d\n",len,get_chunks_per_length(len));
}
return 0;
}
static int get_chunks_per_length(int length)
{
comedi_cmd cmd;
char buf[BUFSZ];
unsigned int chanlist[1];
int go;
int total=0;
int ret;
int chunks=0;
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_arg = length;
cmd.chanlist_len = 1;
chanlist[0] = CR_PACK(0,0,0);
comedi_command(device,&cmd);
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++;
}
}
return chunks;
}
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