AXI4LiteMaster: AttributeError: 'NoneType' object has no attribute 'setimmediatevalue'

[LeChuck42]

I'm instantiating an AXI4LiteMaster in my testbench.

With the default behaviour in cocotb_bus 0.2.1 installed from pypi the following line fails:

cocotb-bus/src/cocotb_bus/drivers/amba.py

Line 67 in 2c846dc

self.bus.AWVALID.setimmediatevalue(0)

with AttributeError: 'NoneType' object has no attribute 'setimmediatevalue'

I traced the cause to this function:

cocotb-bus/src/cocotb_bus/bus.py

Lines 78 to 82 in 2c846dc

	def _caseInsensGetattr(self, obj, attr):
	for a in dir(obj):
	if a.casefold() == attr.casefold():
	return getattr(obj, a)
	return None

When first called, obj doesn't yet have the attributes (e.g. axil_AWVALID) populated. The for loop will iterate through the dir, but not find the signal we are looking for and the function will return None as the handle.
I noticed that hasattr and getattr are not case sensitive for me. So my current workaround for this is to (counterintuitively) set case_insensitive=False in the call to BusDriver.__init__ so this code doesn't get called.

cocotb-bus/src/cocotb_bus/drivers/amba.py

Line 64 in 2c846dc

BusDriver.__init__(self, entity, name, clock, **kwargs)

[LeChuck42]

#45 #42 #39 may be related

[Elefseus]

same to me, the obj() method does not return all signal names.