comedi_test_route — validate and test device-global route


#include <comedilib.h>
int comedi_test_route(comedi_t * device,
 unsigned int source,
 unsigned int destination);




This function validates a globally-named route as connectible and tests whether the route is connected. Note that since comedi_connect_route and comedi_disconnect_route effectively perform the same operations as comedi_set_routing / comedi_get_routing and comedi_dio_config, this operation will only report a route as connected _if_ both operations have been performed directly or effectively via comedi_connect_route. There are several routes that are not globally connectable via comedi_connect_route, such as (NI_PFI(i) --> NI_AO_SampleClock) as they must be connected via a trigger argument, such as comedi_cmd->start_arg for NI_AO_StartTrigger. This function can still be used for such routes to test whether they are valid.

The source parameter specifies the source of the signal route, whereas the destination parameter specifies the destination. Possible values for source and destination are driver dependent but are generally required to be values that are recognizable globally for a particular device, independent of sub-device.

Return value

-1 if not connectible, 0 if connectible but not connected, 1 if connectible and connected.