PINE64 - Pi2, Euler and Exp GPIO Ports

Clusterboard, U-Boot, PL7 LED

Wed, 10 Mar 2021 01:07:26 +0000

Greetings,

U-Boot has a board-specific method with signature

Code:
void show_boot_progress(int val);

Various stages of U-Boot SPL and full U-Boot call this method with a known int to signal the current boot stage.

I would like to activate PL7 on the SOPINE clusterboard which has an LED attached on certain checkpoints in booting.

My question is, does anyone have experience with low-level GPIO registers/memory and knows how to achieve this? We can't use syntactic sugar like the following

Code:
gpio_direction_output(PL7_GPIO, 1);

gpio_set_value(PL7_GPIO, 1);

because the GPIO and DM (driver model) systems are not initialized at power-on yet (and I encounter an infinite loop deep in U-Boot trying to enumerate non-initialized hardware).

I understand the pin number for PL7 is 359 from ([L - A] * 32) + 7.

A solution using one of

Code:
writel(...); or

setbits_le32(...)

would be a probable goal. Any ideas?

How to use dts or other setup to declare gpio pin Interrupt (e.g. a button)?

Tue, 11 Jun 2019 19:11:08 +0000

Using armbian bionic mainline kernel on A64-v1.1 board
Linux pine64 4.19.38-sunxi64 #5.83 SMP Fri May 3 21:02:31 CEST 2019 aarch64 aarch64 aarch64 GNU/Linux

In RPI bionic could just set values in boot.txt. Is this possible in armbian bionic mainline?

I know that one can use device tree overlays but can't find any examples specific to the A64.

Anyone have a dts file or otherwise know how to declare a pin as an interruptible input? I've come across nothing in any A64 docs.

Udev rule for gpios for non root access

Tue, 11 Jun 2019 15:06:24 +0000

Using armbian bionic mainline kernel on A64-v1.1 board
Linux pine64 4.19.38-sunxi64 #5.83 SMP Fri May 3 21:02:31 CEST 2019 aarch64 aarch64 aarch64 GNU/Linux

Need to allow non-root access to gpio pins (i.e. gpio group with access to export and unexport etc) via udev. I've done this successfully before on an RPI but no matter what I try the gpio group and permissions are not set. Maybe it's something specific to Pine64 so asking here.

here is one version of rules I've tried. using udevadm I've confirmed the file is read and loaded but the changes are not made

Code:
SUBSYSTEM=="gpio*", PROGRAM="/bin/sh -c 'find -L /sys/class/gpio/ -maxdepth 2 -exec chown root:gpio {} \; -exec chmod 770 {} \; || true'"

Any suggestions? Anyone have a successful udev rules for this board? If so please share

Pine64 as jtag programmer

Sat, 25 May 2019 12:13:09 +0000

Hi,

Here is a port of Intel's jam-stapl player for raspberry pi

https://github.com/softerhardware/jam-stapl

it programs jam files to altera FPGAs very well. As pine64 too uses the rpi2 bus, what will I have to do to get this jam-staple player to work with pin64 A+ ??

any suggestions ?

configuring Euler Bus pin generate interrupt

Thu, 10 Jan 2019 08:45:43 +0000

Hi, I am looking for help to configure Euler Bus pin in Pine A64+ to generate kernel interrupt. For example. Pin no. 27(PB2) in Euler Bus, have multiplexing function of PB_EINT2.
I would like to register interrupt handler for this pin in the kernel with a help of a simple kernel module. Need help on how to define this pin characteristic in device tree file so that it can be configured to receive external interrupt. Any help will be highly apricated.

Regards
RANJIT

Will EPOLL C or PIGPIO C work on pine64?

Thu, 15 Feb 2018 16:43:38 +0000

I write in nodejs exclusively and on RPI I use this library to control GPIOs
https://github.com/fivdi/pigpio
This module creates bindings to the excellent PIGPIO C library here https://github.com/joan2937/pigpio
and with it and this i2c bus module https://github.com/fivdi/i2c-bus I can anything on the GPIO bus.

I am sure I can get the PIGPIO C library to compile but will it be compatible with the "Pi2" bus on the Pine64?
If so tada I can use my nodejs code directly from RPI to Pine64 without alteration (well except maybe for some pin number translations as pointed out in other posts????)

If PIGPIO C won't work the same dev has a library that uses EPOLL.
So the EPOLL C should compile but will it work with the PINE64 pi2 bus???
https://github.com/fivdi/epoll

I'd much rather use PIGPIO C library as I have discovered it's much more robust than the EPOLL

What are my options here?
I understand I can just write sysfs calls directly in nodejs but I've discovered that's not very robust.
One thing I definitely do frequently on the Pi is use pins as interrupts and that is easy with PIGPIO or EPOLL. As far as I understand if only using sysfs then you have to manually poll the pin state in your code continuously (in nodejs that would be setInterval) looking for a state change (which is really not robust at all).

SPI on mainline

Fri, 09 Feb 2018 17:10:16 +0000

Hi,

How does one get spi to work on mailine kernel?

i added the following to /boot/armbianEnvt.txt so it would load the overlay but that doesn't seem to help, are the overlays outdated for mainline?

verbosity=1
overlay_prefix=sun50i-a64
overlays=spi-spidev
param_spidev_spi_bus=0

Thx,
Jeroen

xbox 360 chatpad

Sun, 24 Dec 2017 04:05:33 +0000

I have been reading up on the xbox 360 chatpad. It appears to be a very cheap mini keyboard that communicates over a uart. The raspberry pi community has a driver for it. I was wondering if any pine users had an interest in doing something similar. I am not sure where to start writing a driver. It seems like a fairly simple interface that has been mapped out here.

I get the main idea is to open a uart, process the inputs, and decipher the key presses. After that is where I am lost as to make the OS see it as a key press input.

Any interest or advice would be cool. Thanks

Controlling a Servo Motor

Thu, 13 Jul 2017 19:14:50 +0000

I'm finding it impossible to work with GPIO and wanted to connect a small servo motor to the Pine64 in order to control it.

In this particular case I want to set 2 particular degrees depending on a variable.
With an Arduino, this is basic: Servo.attach(#controlpin); Servo.write(#angle);

Any tutorials around on how to do it here?

SystemLED ON on boot

Sat, 10 Jun 2017 00:53:35 +0000

Hi, just want to share a little tip:
How to turn the systemLED ("LED") to *ON* when the board is booting (loading the system).

My 1GB Pine64 Board sometimes start booting process and sometimes don't... so I have to way and "see" activities on the screen or LAN interface...

So, I decided to put an LED on the systemLED holes (label "LED"), and switch it to ON when booting...

When using without a monitor (remote) this LED is very helpful...

These 3 lines of script turn the LED to "ON":

Code:
echo "359" > /sys/class/gpio/export 

echo "out" > /sys/class/gpio/gpio359/direction

echo "0"   > /sys/class/gpio/gpio359/value

Full instructions on the link below:
http://www13.plala.or.jp/pskitty/pine64-sysled.html

Drawings, source code, high quality photo, etc, on GitHub:
https://github.com/valterfukuoka/pine64-sysled

Regards all,
Valter

GPIO, SPI and I2C C++ Lib

Thu, 20 Apr 2017 22:00:21 +0000

Hi to everyone! I'm a CS teacher and for some time I playing with my Pine64+. Last week, I built a C++ library (in object oriented paradigm) for manage GPIO, I2C and SPI.

https://github.com/databit/Pine64-CPP

This lib is based on the work of Eric Ptak , Stefan Mavrodiev and Kamil Trzcinski

I hope this library can be of help to you!

Send me yours comments and eventual bugs.

Is there anyway to get spidev0 under /dev

Thu, 09 Mar 2017 14:14:27 +0000

I need to use flashrom utility for flashing my bios rom. And flashrom need spi and spi device should be in spidev0.0 how can i do that in pine64? I searched a lot but i couldnt found. Someone said i should change device tree but i dont know how. Thanks a lot.

Read GPIO problem

Tue, 21 Feb 2017 10:00:13 +0000

I use Pine64 A64-DB-Rev B board and Debian Jessie.

I need read some GPIO pins (69 and 233 on RPI connector) using sysfs. I use pullup resistors (10k) to 3.3v. Measure voltage on these pins. I get 3 v.
Set direction to 'in'.
But, reading /sys/class/gpio/gpioXX/value i always got 0 !

If switch direction to out, then back to in, reading get 1 !

Simple script to test:

Code:
#!/bin/sh

SYSFSDIR=/sys/class/gpio

DOOR_PIN=69

UPLVLPIN=233

setup(){

    if [ ! -d $SYSFSDIR/gpio$1 ] ; then

        echo $1 > $SYSFSDIR/export

    fi

    # If comment out these 2 lines - always read 0 !

    echo 'out' > $SYSFSDIR/gpio$1/direction

    echo 'in' > $SYSFSDIR/gpio$1/direction

}

gpio_read(){

    cat $SYSFSDIR/gpio$1/value

}

setup $DOOR_PIN

setup $UPLVLPIN

case "$1" in

    door)

        gpio_read $DOOR_PIN

        ;;

    uplevel)

        gpio_read $UPLVLPIN

        ;;

    *)

        usage

        ;;

esac

PS: Sorry for my bad english, my native language is Russian

SPI enable?

Tue, 17 Jan 2017 02:40:16 +0000

Anybody to success enable spi port in GPIO?

what your linux version?

GPIO fiq capability

Wed, 09 Nov 2016 23:45:57 +0000

Hello all,

I want to bind the FIQ to a GPIO pin input processing. Is this functionality available on the Pine64?

I see definition of the pending request in drivers/irqchip/irq-sun4i.c,
#define SUN4I_IRQ_FIQ_PENDING_REG(x) (0x20 + 0x4 * x)
but no reference or apparent support in the module.

Should I be looking elsewhere?

Thank you, Joe