67a364cf93
When testing streaming input (or streaming output) command functionality for a subdevice, attempt to make it the current 'read' (or 'write') subdevice by calling the new 'comedi_set_read_subdevice()' (or 'comedi_set_write_subdevice()') function. That is currently only supported by the Linux "in-tree" version of Comedi, since kernel version 3.19. If the attempt fails, and the subdevice is not the current 'read' (or 'write') subdevice, the test will report "not applicable" as before.
83 lines
1.5 KiB
C
83 lines
1.5 KiB
C
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#include <stdio.h>
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#include <comedilib.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 <getopt.h>
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#include <ctype.h>
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#include <math.h>
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#include <sys/time.h>
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#include <string.h>
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#include "comedi_test.h"
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static int get_chunks_per_length(int length);
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#define BUFSZ 10000
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int test_cmd_fifo_depth_check(void)
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{
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int len;
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unsigned int flags = comedi_get_subdevice_flags(device,subdevice);
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/* attempt to make subdevice the current 'read' subdevice */
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if(flags&SDF_CMD_READ) comedi_set_read_subdevice(device,subdevice);
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if(!(flags&SDF_CMD) || (comedi_get_read_subdevice(device)!=subdevice)){
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printf("not applicable\n");
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return 0;
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}
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for(len=64;len<65536;len<<=1){
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printf("%d, %d\n",len,get_chunks_per_length(len));
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}
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return 0;
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}
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static int get_chunks_per_length(int length)
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{
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comedi_cmd cmd;
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char buf[BUFSZ];
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unsigned int chanlist[1];
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int go;
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int total=0;
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int ret;
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int chunks=0;
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if(comedi_get_cmd_generic_timed(device, subdevice, &cmd, 1, 1)<0){
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printf(" not supported\n");
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return 0;
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}
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if(realtime)cmd.flags |= TRIG_RT;
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cmd.chanlist = chanlist;
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cmd.scan_end_arg = 1;
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cmd.stop_arg = length;
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cmd.chanlist_len = 1;
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chanlist[0] = CR_PACK(0,0,0);
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comedi_command(device,&cmd);
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go=1;
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while(go){
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ret = read(comedi_fileno(device),buf,BUFSZ);
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if(ret<0){
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if(errno==EAGAIN){
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usleep(10000);
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}else{
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go = 0;
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perror("read");
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}
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}else if(ret==0){
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go = 0;
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}else{
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total += ret;
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chunks++;
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}
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}
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return chunks;
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}
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