139 lines
2.5 KiB
C
139 lines
2.5 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 comedi_get_cmd_src_mask(comedi_t *it,unsigned int s,comedi_cmd *cmd);
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static int comedi_get_cmd_fast_1chan(comedi_t *it,unsigned int s,comedi_cmd *cmd);
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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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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_fast_1chan(device,subdevice,&cmd)<0){
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printf(" not supported\n");
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return 0;
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}
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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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static int comedi_get_cmd_src_mask(comedi_t *it,unsigned int s,comedi_cmd *cmd)
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{
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memset(cmd,0,sizeof(*cmd));
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cmd->subdev = s;
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cmd->flags = 0;
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cmd->start_src = TRIG_ANY;
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cmd->scan_begin_src = TRIG_ANY;
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cmd->convert_src = TRIG_ANY;
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cmd->scan_end_src = TRIG_ANY;
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cmd->stop_src = TRIG_ANY;
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return comedi_command_test(it,cmd);
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}
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static int comedi_get_cmd_fast_1chan(comedi_t *it,unsigned int s,comedi_cmd *cmd)
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{
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int ret;
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ret = comedi_get_cmd_src_mask(it,s,cmd);
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if(ret<0)return ret;
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cmd->chanlist_len = 1;
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cmd->scan_end_src = TRIG_COUNT;
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cmd->scan_end_arg = 1;
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if(cmd->convert_src&TRIG_TIMER){
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if(cmd->scan_begin_src&TRIG_FOLLOW){
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cmd->convert_src = TRIG_TIMER;
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cmd->scan_begin_src = TRIG_FOLLOW;
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}else{
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cmd->convert_src = TRIG_TIMER;
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cmd->scan_begin_src = TRIG_TIMER;
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}
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}else{
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printf("can't do timed?!?\n");
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return -1;
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}
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if(cmd->stop_src&TRIG_COUNT){
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cmd->stop_src=TRIG_COUNT;
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cmd->stop_arg=2;
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}else if(cmd->stop_src&TRIG_NONE){
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cmd->stop_src=TRIG_NONE;
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cmd->stop_arg=0;
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}else{
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printf("can't find a good stop_src\n");
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return -1;
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}
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ret=comedi_command_test(it,cmd);
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if(ret==3){
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/* good */
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ret=comedi_command_test(it,cmd);
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}
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if(ret==4 || ret==0){
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return 0;
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}
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return -1;
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}
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