GPIO switches on used ports Nano Pi NeoCore

[Johhny Blue]

Hi,

 

I realise the NeoCore is not yet supported, but I hope someone can help me with a problem that I am having using the GPIO as buttons.

 

I would like to use the gpio marked

GPIOPA13,P A14, PA15,P A16 and PA2

 

I think these are used by the UART and SPI - I don't require this functionality.

 

I think I have to modify the fex, I have looked, but do not want to kill my system

 

Isit possible to use those gpio?

 

Can someone point me in the right direction?

TIA.

J.

 

[Igor]

4 minutes ago, Johhny Blue said:

I realise the NeoCore is not yet supported

It is virtually the same board as Neo (you can start with their images) and gpio handling is pretty generic.

 

http://linux-sunxi.org/Fex_Guide

http://linux-sunxi.org/GPIO

https://forum.armbian.com/search/?&q=gpio

 

Just read and try.

[Johhny Blue]

Hey Igor.

Thanks for the reply. I checked out your links and it is way beyond me.

I looked the current fex file and found these 2 occurrences of PA 15

[card_boot]
logical_start = 40960
sprite_work_delay = 500
sprite_err_delay = 200
sprite_gpio0 = port:PA15<1><default><default><default>
next_work = 3

and

[spi1]
spi_used = 0
spi_cs_bitmap = 1
spi_cs0 = port:PA13<2><1><default><default>
spi_sclk = port:PA14<2><default><default><default>
spi_mosi = port:PA15<2><default><default><default>
spi_miso = port:PA16<2><default><default><default>

and PA16

[audio0]
audio_used = 1
lineout_vol = 31
cap_vol = 5
audio_hp_ldo = "none"
adcagc_used = 0
adcdrc_used = 0
dacdrc_used = 0
adchpf_used = 0
dachpf_used = 0
audio_pa_ctrl = port:PA16<1><default><default><0>

So I really don't know what to change it to (without killing my system), that will allow me to connect a button between that port and ground.

Is it even possible with those ports or should I look elsewhere?