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: https://github.com/cocotb/cocotb-bus/blob/2c846dca8d3293b7676c70dd51dbc9c7f51029f0/src/cocotb_bus/drivers/amba.py#L67 with AttributeError: 'NoneType' object has no attribute 'setimmediatevalue'

I traced the cause to this function: https://github.com/cocotb/cocotb-bus/blob/2c846dca8d3293b7676c70dd51dbc9c7f51029f0/src/cocotb_bus/bus.py#L78-L82 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. https://github.com/cocotb/cocotb-bus/blob/2c846dca8d3293b7676c70dd51dbc9c7f51029f0/src/cocotb_bus/drivers/amba.py#L64

[LeChuck42]

#45 #42 #39 may be related

[Elefseus]

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