Let’s take a look at how we can use GreatFET One as a logic analyzer for 3.3 V digital signals. (For I/O voltages other than 3.3 V, you would also need a level shifter.)
The GreatFET logic analysis function uses a peripheral called SGPIO, so we need to connect the SGPIO pins to our target signals. One easy way to find a target is to use one of the GreatFET’s other peripherals such as SPI.
Use jumper wires to make the following connections:
Open an interactive Python shell in your first terminal window:
FIXME set up SPI
In a second terminal window activate logic analysis:
gf logic -p /tmp/spi-capture
FIXME file extension?
In the Python shell, type:
In the second window, terminate gf logic by typing ctrl-c.
FIXME open in pulseview
FIXME analyze in pulseview