Gateware for the ECP5 to determine connections, howto?

[cedric!]

I have bought a Colorlight 75E FPGA board containing an ECP5 FPGA. I noticed I have version 8.0 of the hardware, and that one is not yet documented on this repository [1].

I would like to create gateware that shows what ball of the FPGA goes to what point on the headers.

On each pin, I would like to output a train of pulses, that indicate the ball. First a preamble, and then 2 burst indicating the row and column That way I can look at an LED to figure out the connection.

For example:
A2: 10101010101010000010000010010000 (and then repeat)
G4: 10101010101010000010010010010010010010000010010010010000
C4: 10101010101010000010010010000010010010010000

Has this already been done?
Where can I find a file that defines the balls of the FPGA package?

[1] https://github.com/q3k/chubby75

[hve]

Yes here's some code for the pin scan:

https://github.com/q3k/chubby75/tree/master/5a-75b/pin-scan