Fix mistake getting buffer head position

diff --git a/demo/mmap.c b/demo/mmap.c
index 90b8d3179549748de3362c2ddc01ae27c64f3489..2da8e40bacbcb1d102c0b40afc01e5537304029c 100644 (file)
--- a/demo/mmap.c
+++ b/demo/mmap.c
@@ -79,9 +79,10 @@ int main(int argc, char *argv[])
                exit(1);
        }
 
+       front = 0;
        back = 0;
        while(1){
-               front = comedi_get_buffer_offset(dev,subdevice);
+               front += comedi_get_buffer_contents(dev,subdevice);
                if(verbose)fprintf(stderr,"front = %d, back = %d\n",front,back);
                if(front<back)break;
                if(front==back){
@@ -150,8 +151,8 @@ int prepare_cmd(comedi_t *dev,int subdevice,comedi_cmd *cmd)
        cmd->scan_end_src = TRIG_COUNT;
        cmd->scan_end_arg = n_chan;
 
-       cmd->stop_src = TRIG_COUNT;
-       cmd->stop_arg = n_scan;
+       cmd->stop_src = TRIG_NONE;
+       cmd->stop_arg = 0;
 
        cmd->chanlist = chanlist;
        cmd->chanlist_len = n_chan;