Issues when reading from Microblaze I/O ports

[jenardo]

I used the Microblaze as a sub-module in a certain design.
I can easily write to any of the output (or input/output) ports that I defined.
But, however, when I try to read from that port that I just wrote to, the function (XGpio_DiscreteRead) just returns zeros.
This makes debugging a very difficult issue, as I can't check that certain registers (for example) that I wrote to, were correctly written.

Note:
I used input/output port instead of just output port.
I made the bus a bidirectional one.
Reading from an input port is no problem and funtions correctly.

Any help appreciated.
Thanks.

 

[EDALIST]

Re: Microblaze I/O ports

the simple explenation is that since the bus is bidirectional bus, you just see the actual bus status, i.e other device drive the bus to '0'.

 

[thezooz]

Microblaze I/O ports

I have lab microblaze thezooz@hotmail.com