upload of basic example

c_example/Makefile

+LIBS=-lcomedi -lm
+BINS=test_jr3_comedi.c
+
+all: $(BINS)
+
+clean: 
+	\rm -rf *.o $(BINS)
+
+%: %.c
+	$(CC) -o $@ $(CFLAGS) $^ $(LIBS)
+
+%.o: %.c
+	$(CC) -c -o $@ $(CFLAGS) $<
+

c_example/test_jr3_comedi.c

+// ./test_JR3_comedi /dev/comedi1 0
+//  see /etc/comedi.conf for device, subdevices and channel
+//    Example   
+//             configure /dev/comedi1 jr3_pci
+//             ain 100 /dev/comedi1 0:0
+//   (port 0:1-6  filter 0 fx..mz(order OK?))
+//    port 0:7-12 filter 1 fx..mz(??)
+//   Available: port 0 & 1, but  not yet 3 & 4 of receiver card
+//   
+
+
+#define CF_JR3 "/dev/comedi1"
+#define JR3_PORT 0
+#define NBR_CHAN 6
+#define _POSIX_C_SOURCE 199309 
+#include <time.h>
+#include <comedilib.h>
+#include <stdlib.h>
+#include <stdio.h>
+
+typedef struct {
+  float a[NBR_CHAN];
+} jr3_data_t;
+
+typedef struct {
+  double min;
+  double max;
+  double delta;
+  double maxdata;
+} info_t;
+   
+int main(int argc, char *argv[])
+{
+  comedi_t *cf_jr3;
+  int subdev;
+  if (argc>1){
+     cf_jr3 = comedi_open(argv[1]);
+     subdev = atoi(argv[2]);
+  }
+  else{
+    cf_jr3 = comedi_open(CF_JR3);
+    subdev = JR3_PORT;
+  }
+  if (cf_jr3) {
+    int  n, chan;
+    comedi_range *range;
+    lsampl_t maxdata;
+    info_t info[NBR_CHAN];
+    jr3_data_t  jr3data; // [fx,fy,fz,mx,my,mx] ???? 
+
+    for (chan = 0 ; chan < NBR_CHAN ; chan++) {
+      range = comedi_get_range(cf_jr3, subdev, chan, 0);
+      maxdata = comedi_get_maxdata(cf_jr3, subdev, chan);
+      info[chan].min = range->min;
+      info[chan].max = range->max;
+      info[chan].maxdata = maxdata;
+      info[chan].delta = (range->max - range->min) / maxdata;
+      printf("channel maxdata min max delta %d %d %f %f %f \n", chan, maxdata, range->min, range->max, info[chan].delta);
+    }
+    while (1) {
+      struct timespec delay;
+      lsampl_t data;
+
+      delay.tv_sec = 0;
+      delay.tv_nsec = 500000000;
+      for (chan = 0 ; chan < NBR_CHAN ; chan++) {
+	int err = comedi_data_read(cf_jr3, subdev, chan, 0, 0, &data);
+	if (err < 0) {
+	  printf("comedi_data_read error: err=%d subdev=%d %d %d\n", 
+		 err, subdev, chan, data);
+	} else {
+	  jr3data.a[chan] = info[chan].min + (double)data * info[chan].delta;
+	}
+      }
+      for (chan = 0 ; chan < NBR_CHAN ; chan++) {
+	printf("   %f  ", 1000.0*jr3data.a[chan]);
+      }
+      printf("\n");
+      nanosleep(&delay, 0);
+    }
+  }
+  else{
+    printf("Failed to open device!\n");
+  }
+}