Question on the RockPro64 RK3399 GPIOs...

[axelf]

Howdy,

Not using the /sys/class file IO method.
I'm mmap-ing the RK3399's IO and using address offsets
to read/write the IO. I've got the GPIO, I2C, SPI, 
I2S, & UART all mapped out. Whatever's available at
the 40-pin GPIO header is accessible via mmap'd IO.

Basically it's the methods used in the BCM2835 Library
for low-level IO. I've just translated the methods to 
work for an RK3399 instead of a BCM2835/7 that's used in 
a Pi 2/3B. 
https://www.airspayce.com/mikem/bcm2835/

So far so good...the methods work fine, I just can't get
GPIO3D[0]..[7] and GPIO4C[3]..[5] & GPIO4D[1]..[4]
to toggle. I'll have to check the schematic to verify
they're not used by any other devices.

/Faradn

I attach the spreadsheet ... its WIP as There are still a couple of anomalies that I am still looking into.