How to add a net between two instances in schematic.

Sandeep,

Normally you'd use schCreateWire() to create the physical wire, and then you can use schCheck() to extract connectivity and perform the schematic checks before saving with dbSave().

Regards,

Andrew

Hey Andrew,

If I use schCreateWire() , I need to give list of points for drawing the net in between those 2 points. Is their any I can join to instances by their names, or using their net names.

Hey Andrew,

If I use schCreateWire() , I need to give list of points for drawing the net in between those 2 points. Is their any I can join to instances by their names, or using their net names.

Typically you'd do this by finding the pin location on the symbol and then transforming that into the coordinate system of the parent instance (for each of the two pins you wish to connect) and then calling schCreateWire. There's no API that does all of this for you, and not by net (since usually the net information wouldn't be there until you've wired up the schematics and extracted the connectivity).

If you have the instance id and the pin name, you can do that with these functions (the second is the function you'd call):

/***************************************************************
*                                                              *
*                 (CCFgetPinCentre term snap)                  *
*                                                              *
*         function to get the coordinates of the centre of     *
*    the first pin figure on the specified terminal object     *
*                                                              *
***************************************************************/
(defun CCFgetPinCentre (term snap)
  (mapcar
    (lambda (ord)
      (times (round (quotient ord snap)) snap))
    ;------------------------------------------------------------
    ; Assume the first figure on the first pin is enough
    ;------------------------------------------------------------
    (centerBox (getq 
                 (car (or
                        (getq (car (getq term pins)) figs)
                        (list (getq (car (getq term pins)) fig)))) 
                 bBox))))

/****************************************************************
*                                                               *
*  (CCFgetInstPinCoord inst termName @optional (snap 0.0625))   *
*                                                               *
* Given an instance id and a terminal name, get the coordinates *
*                          of the pin.                          *
*                                                               *
****************************************************************/

(defun CCFgetInstPinCoord (inst termName @optional (snap 0.0625))
  (letseq 
    ((master (getq inst master))
     (term (dbFindTermByName master termName))
     (pinCentre (and term (CCFgetPinCentre term snap))))
    (and pinCentre
         (dbTransformPoint pinCentre (getq inst transform)))))

Regards,

Andrew