On Saturday 16 August 2014 19:32:02 Drew Rogge did opine And Gene did reply: > Is there a way to associate logic component inputs with pins without > using net and creating signals? The example on the Basic HAL Tutorial > creates a signal when connecting parport.0.pin-11-in to and2.0.in0: > > loadrt and2 count= > addf and2.0 servo-thread > > net my-sigin1 and2.0.in0 <= parport.0.pin-11-in > net my-sigin2 and2.0.in1 <= parport.0.pin-12-in > net both-on parport.0.pin-14-out <= and2.0.out > > Unless the signals my-sigin1 and 2 are going to be used for debugging > they seem superfluous.
They are not superfluous, they are assigned as the name of that particular net. The 2nd argument (base zero counting), after the name of the net is usually the input to that net, but you can, 200 lines later in your hal file use a line: net my-sigin1 some_other_module.in-1, and it will be treated as another place to send the originally selected signal to. Personally I much prefer to state the above like this: net my-sigin1 parport.0.pin-11-in and2.0.in0 net my-sigin2 parport.0.pin-12-in and2.0.in1 net both-on and2.0.out parport.0.pin-14-out That way, you don't have to check those => and <= to determine the signal source, it is always argv(2) in C parlance, (thats base zero counting) the 3rd item listed on the line originally defining the net's name. The 4th, 5th etc items on the line are all places where the output of that and2.0.out is connected to. Coding style in the hal file is a personal choice, because it will accept either the order on the line, or the =<, =>. Both I believe work, but its easier for me to follow the logic if its in a fixed order as above. That preference may be the result of the years accumulated on the wet ram too. :-) > Drew Cheers, Gene Heskett -- "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) Genes Web page <http://geneslinuxbox.net:6309/gene> US V Castleman, SCOTUS, Mar 2014 is grounds for Impeaching SCOTUS ------------------------------------------------------------------------------ _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
