changes

demo/cmd.c

@@ -39,10 +39,14 @@ int main(int argc, char *argv[])
 	fn = "/dev/comedi0";
 
 	dev = comedi_open(fn);
+	if(!dev){
+		perror(fn);
+		exit(1);
+	}
 
-	//fcntl(comedi_fileno(dev),F_SETFL,O_NONBLOCK);
+	fcntl(comedi_fileno(dev),F_SETFL,O_NONBLOCK);
 
-	do_cmd_2(dev);
+	do_cmd_1(dev);
 
 	return 0;
 }
@@ -103,14 +107,15 @@ static void do_cmd(comedi_t *dev,comedi_cmd *cmd)
 				usleep(10000);
 			}else{
 				go = 0;
+				perror("read");
 			}
+		}else if(ret==0){
+			go = 0;
 		}else{
 			total+=ret;
+			printf("read %d %d\n",ret,total);
 		}
-		printf("read %d %d\n",ret,total);
 	}
-	perror("ack");
-	printf("errno=%d\n",errno);
 }
 
 static void do_cmd_1(comedi_t *dev)

demo/insn.c

@@ -35,7 +35,7 @@ comedi_t *device;
  *
  */
 
-#define N_SAMPLES 10
+#define N_SAMPLES 1
 
 int main(int argc, char *argv[])
 {
@@ -69,6 +69,7 @@ int main(int argc, char *argv[])
 	insn[0].n=2;
 	insn[0].data=(void *)&t1;
 
+//#if 0
 	/* Instruction 1: do 10 analog input reads */
 	insn[1].insn=INSN_READ;
 	insn[1].n=N_SAMPLES;
@@ -80,6 +81,12 @@ int main(int argc, char *argv[])
 	insn[2].insn=INSN_GTOD;
 	insn[2].n=2;
 	insn[2].data=(void *)&t2;
+//#endif
+#if 0
+	insn[1].insn=INSN_GTOD;
+	insn[1].n=2;
+	insn[1].data=(void *)&t2;
+#endif
 
 	ret=comedi_do_insnlist(device,&il);
 	if(ret<0){
@@ -93,6 +100,9 @@ int main(int argc, char *argv[])
 	}
 	printf("final time: %ld.%06ld\n",t2.tv_sec,t2.tv_usec);
 
+	printf("difference (us): %ld\n",(t2.tv_sec-t1.tv_sec)*1000000+
+			(t2.tv_usec-t1.tv_usec));
+
 	return 0;
 }
 

demo/mode2.c

@@ -36,7 +36,7 @@ int external_trigger_number = 0;
 
 #define N_SAMPLES	(N_CHANS*N_SCANS)
 
-sampl_t data[N_SAMPLES];
+sampl_t data[4096];
 
 
 int main(int argc, char *argv[])
@@ -44,12 +44,12 @@ int main(int argc, char *argv[])
 	char *fn = NULL;
 	comedi_trig it;
 	int err;
-	int n,i;
+	int n,i,m;
 	comedi_t *dev;
 	double actual_freq;
 	unsigned int chan[N_CHANS];
 
-	fn = "/dev/comedi3";
+	fn = "/dev/comedi0";
 
 	dev = comedi_open(fn);
 
@@ -59,7 +59,7 @@ int main(int argc, char *argv[])
 	it.n_chan = 1;
 	it.chanlist = chan;
 	it.data = data;
-	it.n = N_SCANS;
+	it.n = 0; //N_SCANS;
 	it.trigsrc = 0;
 	it.trigvar = 10000;
 	it.trigvar1 = 10000;
@@ -74,12 +74,21 @@ int main(int argc, char *argv[])
 		exit(1);
 	}
 
-	if((n=read(comedi_fileno(dev),data,N_SAMPLES*sizeof(sampl_t)))<0){
-		perror("read");
-		exit(1);
+	m=0;
+	while(1){
+		if((n=read(comedi_fileno(dev),data,4096*sizeof(sampl_t)))<0){
+			perror("read");
+			exit(1);
+		}
+		if(n==0){
+			perror("damn");
+			exit(1);
+		}
+		n/=sizeof(sampl_t);
+		m+=n;
+		printf("read=%d total=%d data[0]=%d data[N-1]=%d\n",
+			n,m,data[0],data[n-1]);
 	}
-	printf("number of samples read=%d\ndata[0]=%d\ndata[N-1]=%d\n",
-		n/sizeof(sampl_t),data[0],data[N_SAMPLES-1]);
 
 	return 0;
 }