Is there any good reference on how to map/use the expansion headers in Cyclone 5 eval kits? I am using Terasic Cyclone 5 eval with 2x20 expansion header. And I want to use several expansion pins as raw GPIO.
I’m running on Linux, where I am already able to read the values from the switches (raw GPIO) and set values for LEDs. But I can’t seem to get the expansion header pin into GPIO mode, primarily as input mode. The datasheet of this kit is indicating the expansion headers are mapped to GPIO1. But I always read 0 from GPIO0, GPIO1, or GPIO mapped addresses.
What am I missing (pinmux?) ? Or where should I check (repos) for good reference?