added check in command test for peculiar restrictions on pcidas-4020 chanlists

diff --git a/comedi/drivers/cb_pcidas64.c b/comedi/drivers/cb_pcidas64.c
index 3db855b823744b7c6c8cafe6f2c4a67970084945..dba5bf8d69e3bbd722b1b5ffb828deb05564607f 100644 (file)
--- a/comedi/drivers/cb_pcidas64.c
+++ b/comedi/drivers/cb_pcidas64.c
@@ -1504,7 +1504,25 @@ static int ai_cmdtest(comedi_device *dev,comedi_subdevice *s, comedi_cmd *cmd)
                                break;
                        }
                }
-               // XXX check 4020 chanlist
+               // check 4020 chanlist
+               if( board(dev)->layout == LAYOUT_4020 )
+               {
+                       unsigned int first_channel = CR_CHAN( cmd->chanlist[0] );
+                       for( i = 1; i < cmd->chanlist_len; i++ )
+                       {
+                               if( CR_CHAN( cmd->chanlist[ i ] ) != first_channel + i )
+                               {
+                                       comedi_error( dev, "chanlist must use consecutive channels" );
+                                       err++;
+                                       break;
+                               }
+                       }
+                       if( cmd->chanlist_len == 3 )
+                       {
+                               comedi_error( dev, "chanlist cannot be 3 channels long, use 1, 2, or 4 channels" );
+                               err++;
+                       }
+               }
        }
 
        if(err) return 5;