Libmraa-rockpi4 not found

Hardware and peripherals
1

Following the instructions found at:
https://wiki.radxa.com/Rockpi4/dev/libmraa#Install_libmraa-rockpi4
to install the libmraa-rockpi4 library e.g.
apt-get install libmraa-rockpi4
I get the following error:
E: Unable to locate package libmraa-rockpi4

Has anyone successfully installed this library and got it to work?

2

Which image are you running? Currently we only packed the arm64 deb for libmraa.

3

Running Debian Stretch then applied the Radxa APT changes.

4

We will add the armhf libmraa package on Monday. You can build it by yourself for now.

git clone https://github.com/brian541/mraa.git

Then follow the instructions here:

mraa/docs/building.md at master Ā· brian541/mraa Ā· GitHub

to make and make install it.

5

Hi,

ROCK Pi 4 armhf Libmraa package is added.

Install it by

sudo apt-get update
sudo apt-get install libmraa-rockpi4

For more details, please checkout

https://wiki.radxa.com/Rockpi4/dev/libmraa

1 Like
6

In order to avoid all unnecessary difficulties, I have freshly installed rockpi4_debian_stretch_lxde_armhf_20181105_2120-gpt.img.gz on my 32GB eMMC. Then I worked through all described steps.
https://wiki.radxa.com/Rockpi4/dev/libmraa
Unfortunately I cannot install libmraa-rockpi4.

mike@mpc4:~$ ssh linaro@rpi4b
linaro@rpi4bā€™s password:
Linux rpi4b 4.4.154-75-rockchip-00013-gcc4fef3 #2 SMP Sat Mar 23 15:05:37 CST 2019 aarch64

The programs included with the Debian GNU/Linux system are free software;
the exact distribution terms for each program are described in the
individual files in /usr/share/doc/*/copyright.

Debian GNU/Linux comes with ABSOLUTELY NO WARRANTY, to the extent
permitted by applicable law.
Last login: Tue Mar 26 08:42:21 2019 from 192.168.178.24
linaro@rpi4b:~$ sudo apt update
Hit:1 http://apt.radxa.com/stretch stretch InRelease
Ign:2 Index of /debian stretch InRelease
Hit:3 http://repo.linaro.org/ubuntu/linaro-overlay stretch InRelease
Hit:4 http://security.debian.org stretch/updates InRelease
Hit:5 Index of /debian stretch-updates InRelease
Hit:6 Index of /debian stretch Release
Reading package listsā€¦ Done
Building dependency tree
Reading state informationā€¦ Done
All packages are up to date.
linaro@rpi4b:~$ sudo apt install libmraa-rockpi4
Reading package listsā€¦ Done
Building dependency tree
Reading state informationā€¦ Done
libmraa-rockpi4 is already the newest version (0.1).
0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
1 not fully installed or removed.
After this operation, 0 B of additional disk space will be used.
Do you want to continue? [Y/n]
Setting up libmraa-rockpi4 (0.1) ā€¦
E: Could not get lock /var/lib/dpkg/lock - open (11: Resource temporarily unavailable)
E: Unable to lock the administration directory (/var/lib/dpkg/), is another process using it?
dpkg: error processing package libmraa-rockpi4 (ā€“configure):
subprocess installed post-installation script returned error exit status 100
Errors were encountered while processing:
libmraa-rockpi4
E: Sub-process /usr/bin/dpkg returned an error code (1)
linaro@rpi4b:~$

I donā€™t know why it is to this ā€œlibmraa-rockpi4 is already the newest version (0.1).ā€ Message comes, this came already with the first attempt of the installation. After that I have to uninstall the package with ā€œapt purgeā€ and then start over, but nothing changes. However, I get another, perhaps interesting, message.

linaro@rpi4b:~$ sudo apt purge libmraa-rockpi4
Reading package listsā€¦ Done
Building dependency tree
Reading state informationā€¦ Done
The following packages will be REMOVED:
libmraa-rockpi4*
0 upgraded, 0 newly installed, 1 to remove and 0 not upgraded.
1 not fully installed or removed.
After this operation, 0 B of additional disk space will be used.
Do you want to continue? [Y/n]
(Reading database ā€¦ 75098 files and directories currently installed.)
Removing libmraa-rockpi4 (0.1) ā€¦
dpkg: warning: while removing libmraa-rockpi4, directory ā€˜/usr/local/lib/python2.7ā€™ not empty so not removed
linaro@rpi4b:~$

But there doesnā€™t seem to be any lock.

linaro@rpi4b:~$ sudo lsof /var/lib/dpkg/lock
linaro@rpi4b:~$

7

Hi, @SunWukong

We have updated a newer version of package. Not need to install a system image, just do this.

sudo apt-get update
sudo apt-get install libmraa-rockpi4
2 Likes
8

Thank you, now it works. :slightly_smiling_face:

linaro@rpi4b:~$ sudo apt update
Get:1 http://apt.radxa.com/stretch stretch InRelease [2361 B]
Ign:2 Index of /debian stretch InRelease
Hit:3 http://repo.linaro.org/ubuntu/linaro-overlay stretch InRelease
Get:4 Index of /debian stretch-updates InRelease [91.0 kB]
Hit:5 Index of /debian stretch Release
Hit:6 http://security.debian.org stretch/updates InRelease
Get:7 http://apt.radxa.com/stretch stretch/main armhf Packages [10.3 kB]
Fetched 104 kB in 2s (50.0 kB/s)
Reading package listsā€¦ Done
Building dependency tree
Reading state informationā€¦ Done
All packages are up to date.
linaro@rpi4b:~$ sudo apt install libmraa-rockpi4
Reading package listsā€¦ Done
Building dependency tree
Reading state informationā€¦ Done
The following additional packages will be installed:
libjson-c3
The following NEW packages will be installed:
libjson-c3 libmraa-rockpi4
0 upgraded, 2 newly installed, 0 to remove and 0 not upgraded.
Need to get 248 kB of archives.
After this operation, 57.3 kB of additional disk space will be used.
Do you want to continue? [Y/n]
Get:1 Index of /debian stretch/main armhf libjson-c3 armhf 0.12.1-1.1 [24.2 kB]
Get:2 http://apt.radxa.com/stretch stretch/main armhf libmraa-rockpi4 armhf 0.3 [223 kB]
Fetched 248 kB in 0s (1152 kB/s)
Selecting previously unselected package libjson-c3:armhf.
(Reading database ā€¦ 74961 files and directories currently installed.)
Preparing to unpack ā€¦/libjson-c3_0.12.1-1.1_armhf.deb ā€¦
Unpacking libjson-c3:armhf (0.12.1-1.1) ā€¦
Selecting previously unselected package libmraa-rockpi4.
Preparing to unpack ā€¦/libmraa-rockpi4_0.3_armhf.deb ā€¦
Unpacking libmraa-rockpi4 (0.3) ā€¦
Setting up libjson-c3:armhf (0.12.1-1.1) ā€¦
Processing triggers for libc-bin (2.24-11+deb9u4) ā€¦
Setting up libmraa-rockpi4 (0.3) ā€¦
linaro@rpi4b:~$

9

A small unimportant bug is in Wicki, since we did not clone mraa-gpio from Github and compile it afterwards, but got the package via apt install, the call is slightly different.

https://wiki.radxa.com/Rockpi4/dev/libmraa

Use mraa-gpio tool to test

rock@localhost:~/mraa/build$ mraa-gpio list

Thatā€™s how it worked for me.

linaro@rpi4b:~$ mraa-gpio list
01 3V3:
02 5V:
03 SDA7: GPIO I2C
04 5V:
05 SCL7: GPIO I2C

10

Both for the tool i2cdetect and for Python 2.7 the bus 0 has to be addressed with its ID 7. Otherwise it works quite well. I connected the character OLED NHD-0420CW from Newhaven Display to I2C as a test.

linaro@rpi4b:~$ mraa-i2c list
Bus   0: id=07 type=linux  default
Bus   1: id=02 type=linux 
Bus   2: id=06 type=linux 
linaro@rpi4b:~$ sudo mraa-i2c detect 0
00: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
10: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
20: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
30: -- -- -- -- -- -- -- -- -- -- -- -- -- 3d -- -- 
40: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
50: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
60: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
70: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
linaro@rpi4b:~$ sudo i2cdetect -y 7
     0  1  2  3  4  5  6  7  8  9  a  b  c  d  e  f
00:          -- -- -- -- -- -- -- -- -- -- -- -- -- 
10: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
20: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
30: -- -- -- -- -- -- -- -- -- -- -- -- -- 3d -- -- 
40: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
50: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
60: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
70: -- -- -- -- -- -- -- --                         

#!/usr/bin/python
# -*- coding: utf-8 -*-
# Example lcd_showtime
# shows time and date in first tow rows of LCD
# Date: Dec 8th, 2017
# 

import os
from I2cCharDisplay import I2cCharDisplay
# import locale                                   # https://help.ubuntu.com/community/Locale
from time import strftime
import threading                                  # I do not like to use sleep(1) to wait a second, not even in an example

OLEDADDRESS =   0x3d                              # i2c address for the oled display
busnum = 7
# locale.setlocale(locale.LC_ALL,'de_DE.utf8')    # Set locale for a nice date, to date french girl, change to fr_FR.utf8

oled = I2cCharDisplay("OLED", OLEDADDRESS, 4)     # create an oled object for a 4 line display


def getCpuTemperature():
    tempFile = open( "/sys/class/thermal/thermal_zone0/temp" )
    cpu_temp = tempFile.read()
    tempFile.close()
    return float(cpu_temp)/1000


oled.clear()
oled.setBrightness(4)


def show_time():
    threading.Timer(1.0, show_time).start()         # Show time and date every second
    oled.cursorMove(col=7,row=1)
    oled.writeString(strftime('%H:%M:%S'))          # Hour:minute:second
    oled.cursorMove(col=3,row=2)
    oled.writeString(strftime('%a %d. %b %Y'))      # Weekday as localeā€™s abbreviated name, Day of the month,
                                                    # Month as localeā€™s abbreviated name, Year with century
    oled.cursorMove(col=4,row=3)
    oled.writeString("CPU temp ")
    oled.writeString(str(round(getCpuTemperature(), 1)))
    oled.writeString("C")

show_time()
1 Like