+ def jtag_request(self, name, number=0, *, dir=None, xdr=None):
+ """request a Resource (e.g. name="uart", number=0) which will
+ return a data structure containing Records of all the pins.
+
+ this override will also - automatically - create a JTAG Boundary Scan
+ connection *without* any change to the actual Platform.request() API
+ """
+ core_mgr = self.jtag.core_mgr
+ padlookup = self.jtag.padlookup
+ # okaaaay, bit of shenanigens going on: the important data structure
+ # here is Resourcemanager._ports. requests add to _ports, which is
+ # what needs redirecting. therefore what has to happen is to
+ # capture the number of ports *before* the request. sigh.
+ # start_ports = len(core_mgr._ports)
+ # value = core_mgr.request(name, number, dir=dir, xdr=xdr)
+ # end_ports = len(core_mgr._ports)
+
+ # take a copy of the requests made
+ self.jtag.requests_made.append((name, number, dir, xdr))
+
+ # now make a corresponding (duplicate) request to the pad manager
+ # BUT, if it doesn't exist, don't sweat it: all it means is, the
+ # application did not request Boundary Scan for that resource.
+ pad_start_ports = len(core_mgr._ports)
+ pvalue = core_mgr.request(name, number, dir=dir, xdr=xdr)
+ pad_end_ports = len(core_mgr._ports)
+
+ # ok now we have the lengths: now create a lookup between the pad
+ # and the core, so that JTAG boundary scan can be inserted in between
+ #core = self._ports[start_ports:end_ports]
+ pads = core_mgr._ports[pad_start_ports:pad_end_ports]
+ # oops if not the same numbers added. it's a duplicate. shouldn't happen
+ #assert len(core) == len(pads), "argh, resource manager error"
+ #print ("core", core)
+ print ("pads", pads)
+
+ # pad/core each return a list of tuples of (res, pin, port, attrs)
+ #for pad, core in zip(pads, core):
+ for pad in pads:
+ # create a lookup on pin name to get at the hidden pad instance
+ # this pin name will be handed to get_input, get_output etc.
+ # and without the padlookup you can't find the (duplicate) pad.
+ # note that self.padlookup and self.jtag.ios use the *exact* same
+ # pin.name per pin
+ pin = pad[1]
+ #corepin = core[1]
+ if pin is None: continue # skip when pin is None
+ #assert corepin is not None # if pad was None, core should be too
+ print ("iter", pad, pin.name)
+ print ("existing pads", padlookup.keys())
+ assert pin.name not in padlookup # no overwrites allowed!
+ #assert pin.name == corepin.name # has to be the same!
+ padlookup[pin.name] = pad # store pad by pin name
+
+ # now add the IO Shift Register. first identify the type
+ # then request a JTAG IOConn. we can't wire it up (yet) because
+ # we don't have a Module() instance. doh. that comes in get_input
+ # and get_output etc. etc.
+ iotype = resiotypes[pin.dir] # look up the C4M-JTAG IOType
+ io = self.jtag.add_io(iotype=iotype, name=pin.name) # create IOConn
+ self.jtag.ios[pin.name] = io # store IOConn Record by pin name
+
+ # finally return the value just like ResourceManager.request()
+ return pvalue
+