Unanswered Questions
9,773 questions with no upvoted or accepted answers
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Cannot Use SPI frequency above 500 kHz
I am running Arch Linux ARM on a Raspberry Pi 2 Model B, and I am attempting to communicate with a TFT display. I am writing a kernel module to interface with the display using SPI, and it works, but ...
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7
votes
1
answer
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Ubuntu 21.10 desktop environments freezing on Pi 400
I have created SD card with Ubuntu Desktop 21.10 using Pi Imager on Raspbian. It boots fine but when I interact with desktop environment, e.g. re-arrange the icons on the sidebar, the desktop ...
CommunityBot
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7
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0
answers
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connmanctl having problem with complex passphrase
The built in WiFi module seems to work fine, as it can connect to both of my open networks I created for testing, i.e. the 2.4GHz, and the 5.0GHz ones.
If I set a simple passphrase (i.e. contains ...
7
votes
1
answer
2k
views
How to start xorg on a physically connected display via SSH?
The pi is configured to start into text mode so that no xorg libraries are loaded during normal operation. Yet I would like to be able to occasionally run an xorg desktop session when connected to an ...
CommunityBot
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7
votes
1
answer
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Open Splash Page After Connecting to Wifi Hotspot
I'm using my pi3 to display a local "website" as described here Making a Raspberry Pi 3 accessible w/o configuration via WiFi and static IP/URL.
Therefore, I'm creating a hotspot with the pi. This ...
CommunityBot
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7
votes
0
answers
882
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Debugging a RPi using SWD
Has anybody been able to figure out how to debug a Raspberry Pi 3 model B using SWD? To be clear, I'm looking to debug the Pi itself using SWD. We've tried setting up the GPIO pins to use JTAG-SWD, ...
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6
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0
answers
1k
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Docker Alpine:latest image fails to get date so everything fails
I just got a Raspberry pi 4 with 8GB and a SD. I ran all the updates and went directly to install docker and discovered that many images were randomly failing. I narrowed it down to the alpine:latest ...
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6
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475
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FIQ interrupt configuration
I have tried to write a driver (in the kernel) that interrupts every time the data received from the ADC is ready to be read (Analog to digital conversion is done).
The problem is that sometimes the ...
- 61
6
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0
answers
314
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Raspberry as I2C Slave, how to slow down transfer rate?
I have had minor success using the PIGPIO library and interfacing the Pi as an I2C Slave (Using GPIO Pins 18 and 19 as SDA and SCL) with a Campbell CR1000X Datalogger
I am encountering a problem ...
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6
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answers
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Bluetooth PAN on the Pi Zero W
I have the following problem:
I want to host a webserver on my Pi Zero W and access it over Bluetooth. To achieve this i tried to use PAN as underlying layer.
The first time i followed this post.
Most ...
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6
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0
answers
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how to connect raspberry pi to google home app?
How am I to connect my Raspberry Pi 3 (PIXEL desktop) to the Google Home app if it already has Google assistant on it?
CommunityBot
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6
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Bluetooth MAC Address Raspberry Pi 3
I'm trying to connect two raspberry pi 3 betweem them via bluetooth.
But the fact is that their MAC addresses are AA:AA:AA:AA:AA:AA
Does anyone knows how to assign them a real mac address in order ...
- 220
6
votes
2
answers
405
views
MMA845X accelerometer mapped at 1C
I have a MMA845X accelerometer mapped at 1C:
0 1 2 3 4 5 6 7 8 9 a b c d e f
00: -- -- -- -- -- -- -- -- -- -- -- -- --
10: -- -- -- -- -- -- -- -- -- -- -- -- 1c -- -- -...
CommunityBot
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6
votes
1
answer
803
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QT 5.6 QBluetooth: Either no Qt D-Bus found or no BlueZ headers
I am trying to get blue tooth working on my Raspberry Pi using the latest Raspbian image and the Qt 5.6 source. After recompiling twice (which takes about 35 hours) I keep getting the following error: ...
CommunityBot
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6
votes
2
answers
1k
views
Wifi raspberry pi 2 problem
My wifi adapter worked fine with the Rapsberry pi B but when I update to Raspberry pi2 it doesn't work. I'm using wheezy and when I run lsusb I get:
Bus 001 Device 002: ID 0424:9514 Standard ...
CommunityBot
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6
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0
answers
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Cannot find -lgcc -lc
I'm trying to compile the FreeRTOS port to Raspberry Pi, but when I compile, I get the error:
arm-none-eabi-ld: cannot find -lgcc
arm-none-eabi-ld: cannot find -lc
make: *** [kernel.elf] Error 1
I'm ...
6
votes
0
answers
908
views
Inateck BTA-CSR4B2 USB Bluetooth 4.0 Adapter not scanning
I bought an Inateck BTA-CSR4B2 USB Bluetooth 4.0 Adapter and plugged it into my Raspberry Pi. Setup was smooth (got bluetooth, blueman, bluez-utils from apt-get), but I can't get any scan results from ...
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6
votes
2
answers
416
views
Pi4J kills USB bus?
Hello fellow Pi enthusiasts :)
I am currently attempting to control a standard 16x2 character LCD display from the PI's GPIO pins from Java.
I downloaded Pi4J and wrote a small program to initialize ...
CommunityBot
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5
votes
0
answers
1k
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raspi ubuntu 20 - apt-get update problem - linux firmware / linux-raspi / linux-image-raspi
Hy
my raspi has this fstab:
UUID=7d298733-8450-4adb-b654-6de49954db5c / btrfs defaults 0 0
UUID=AD5E-0725 /boot/firmware vfat defaults 0 1
Then the ...
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0
answers
2k
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RPi-Zero, HID keyboard gadget for BIOS keyboard
After another user related question on this forum I try to get my USB HID Gadget Keyboard running in BIOS. My gadget is the RPi-Z using libcomposite on Raspbian Buster.
When I plug my keyboard into ...
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5
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0
answers
2k
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Raspberry Pi 4 - Dual Audio with Dual HDMI
I have a Raspberry Pi 4. The thing is, I want to play 2 videos at the same time, since the RPi-4 has 2 HDMI outputs. BUT I also want to have split audio. The audio from video 1 should go out over the ...
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5
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0
answers
923
views
Custom camera driver
Is it possible to write a driver, say for a OV camera, based on the existing drivers at the RPI git repo?
As is I understand, with a datasheet for a sensor it should be possible to write a similar ...
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5
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0
answers
3k
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Why doesn't extract-vmlinux work with Raspbian's /boot/kernel*.img?
To monitor if a reboot is necessary, I wanted to compare the version of /boot/kernel*img against the version of the running kernel.
To get the kernel version of a compressed linux kernel image (...
- 1,210
5
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0
answers
2k
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Why won't pygame play sound over Bluetooth when everything else works?
I having trouble getting a program I've written using the pygame sound mixer to play sound to work over Bluetooth. The program is able to work correctly over HDMI audio. The Raspberry Pi has no ...
- 101
5
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0
answers
965
views
blank screen on xrdp
xrdp is working up to and until today. I have today "sudo apt-get upgrade" and since then xrdp has stopped working. The login screen comes up but when i get in it is just a blank screen (the aqua one)....
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0
answers
1k
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Unable to autosave snes rom (Zelda)
I've added to /opt/retropie/emulators/retroarch/retroarch.cfg:
input_enable_hotkey_btn = 8
input_exit_emulator_btn = 9
based on http://nickbartlett.com/retropie-emulationstation-not-saving-game-...
5
votes
1
answer
889
views
Detect if a host is connected (gadget mode)
Device: Raspberry Pi Zero W v1.1
State: Pi Zero is running in gadget mode, acting as a USB Mass Storage device (seen by / mounted on a MacBook Pro).
Question: What is the best way to detect whether ...
- 2,837
4
votes
1
answer
5k
views
Virtualization of Raspberry Pi OS 64-bit arm64 on M1 (arm64) Macbooks
I was wondering whether it was possible to virtualize Raspberry Pi OS Lite Bullseye 64-bit arm64 on an M1 Macbook pro. I've downloaded the '.img' file from the official source and tried to load it ...
CommunityBot
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4
votes
1
answer
529
views
Arm Arch Linux 'startx' displays black screen on Raspberry Pi 3
Context: I recently got started with Arch Linux and the whole building your own distro thing. So I put Arch Linux Arm version on my Raspberry Pi 3 Model B v1.2 from the Arch Linux Arm project. I put ...
CommunityBot
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4
votes
1
answer
433
views
Does the Raspberry Pi 4's processor support ARM's SHA256 instructions?
According to Wikipedia, every Armv8 processor should support sha256 hashing instructions however /proc/cpuinfo doesn't list it. Could there be a failure to identify the feature by the kernel?
...
CommunityBot
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4
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0
answers
2k
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Plymouth bootsplash starting too late
I've set up a Plymouth bootsplash inside an initramfs on Raspbian buster. (It's using something similar but not identical to the raspi-config RO overlay.) But I've noticed that there's a ...
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4
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0
answers
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BLE Connect fails with page timeout
I've got a custom BLE 4.1 device and I'm trying to connect it to Raspberry PI 3 B+ using hcitool, gatttool, bluetoothctl, ..., without success.
The device is an NRF BLE chip with the Nordic UART ...
- 141
4
votes
1
answer
8k
views
Alsa lib error pyaudio on raspberry pi 3
I'm getting these ALSA lib errors when trying to use pyaudio.
I know my mic works as I can live stream audio through gstreamer.
Can anybody explain to me why i'm getting these issues:
ALSA lib ...
CommunityBot
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4
votes
0
answers
3k
views
running pulseaudio in system mode without X
I would like to make pulseaudio work on my Raspberry Pi 3 without X installed.
I'm using the Arch Linux ARM distribution and these are the packages I have installed related to pulseauio and alsa:
$ ...
- 141
4
votes
0
answers
363
views
Watchdog service doesn't kick /dev/watchdog in OSMC
I have installed watchdog service on OSMC/Raspberry Pi 3. It starts now automatically, but doesn't touch the /dev/watchdog device.
How I check this:
ls -l /dev/watchdog
crw------- 1 root root 10, ...
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4
votes
0
answers
1k
views
Connecting Pi3 ModelB with a Sony PS3 DualShock controller
I bought the following model of Raspberry Pi3 from Amazon.
RASPBERRYPI3-MODB-1GB
which claims to support: Bluetooth 4.1, Bluetooth Low Energy
And I also got a Sony DualShock PS3 controller with ...
4
votes
0
answers
657
views
Android Things (0.5.1) fails to initialize GPU on Raspberry Pi 3 Model B?
I have just set-up a Raspberry Pi 3 with Android Things using the latest developer preview (5.1). It boots and I can run some minimum samples, and the output can be seen normally in a HDMI screen. So, ...
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4
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0
answers
13k
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Key Combination to interrupt bootup and get a terminal?
Is there a way for me to interrupt the boot of the raspberry pi and go into the terminal straightaway?
Background:
I have installed a faulty LCD display driver, so I am connected to my HDMI display &...
CommunityBot
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4
votes
0
answers
5k
views
Bluetooth repeater/bridge
I was wondering if somebody already tried to create some sort of Bluetooth repeater or bridge? I know they are not the same, but both systems should work for my needs.
In detail, I am trying to ...
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4
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0
answers
1k
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FT5406 touchscreen sends events but input does not work
I have a Raspi 3B with the official 7" touchscreen attached. The screen works (showed the under-voltage sign when attaching only the screen controller to a 2.1 A power supply, so I'm connecting ...
- 2,796
4
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0
answers
469
views
RPi3 PulseAudio & Avahi problem
I have an Ubuntu 17.04 server which is sharing its sinks (connected speakers) and sources (USB microphone) with my local network. I've ensured the PulseAudio cookie has been pre-shared and on my ...
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4
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0
answers
352
views
I2s DAC audio out but USB audio in
I was wondering if anyone could help me.
I am trying to set up my Pi 3 to be an assistant (Google or Alexa, etc). I had it set up working fine with the USB mic and the 3.5mm audio out, but I wanted ...
- 4,200
4
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0
answers
820
views
RPI 3B and Tiny Thermal Printer - Unable to use python library
I'm having trouble hooking up my Raspberry Pi 3 Model B to my Adafruit Tiny Thermal Printer (nb: not the mini thermal printer - this is the one with a mini-USB port built in).
I've got it connected ...
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4
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0
answers
9k
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Connecting a headless Pi Zero W to a bluetooth speaker
Edit: The problem does not occur using another bluetooth speaker. As that speaker is also the one I'm planning on using, the question is now only of academic interest.
I'm trying to set up a small ...
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4
votes
1
answer
2k
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Play sound with mono c# doesn't work on Raspbian
I try to play a sound from a Raspberry Pi 3 with Raspbian installed. I have mono installed. I tested it on Windows, and it runs well. But when running it on Raspbian. I don't get any error message and ...
CommunityBot
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4
votes
0
answers
2k
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Can the Compute Module 3 support 240fps from the Pi Camera v2?
The Compute Module 3 supports CAM1 with 4x Lane CSI MIPI as does the official doc for the Sony IMX219 camera module. It has been explained in many places that the reason the standard Raspberry Pi ...
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4
votes
1
answer
2k
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How to change default apache folder to Flash drive on Raspbian?
I have apache 2.4 on my raspberry pi and need to change DocumentRoot to flash drive folder.
But I have 403 Forbidden.
In apache logs:
AH01630: client denied by server configuration: /media/pi/www/...
CommunityBot
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4
votes
1
answer
3k
views
How to blacklist devices on a raspberry pi 3 router setup?
I've recently set up a raspberry pi 3 as a simple wifi router, using:
Ubuntu 16.04
hostapd
dnsmasq
I've followed the following tutorial and all went pretty smooth: https://frillip.com/using-your-...
CommunityBot
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4
votes
0
answers
629
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How to install the MINI4x6 terminal font on the latest Raspbian (Jessie-lite)
I'm using a small 3.2" LCD screen and want to get as much text on it as possible (console screen). So far I can choose between Terminus6x12 or VGA8x8, but the MINI4x6 font seems to be missing.
I have ...
CommunityBot
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4
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0
answers
2k
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PN532 Unable to wait for SPI data
I'm following this https://www.raspberrypi.org/forums/viewtopic.php?f=45&t=78966using a PN532 I purchased. When i type in
NFC-LIST
I get this:
nfc-list uses libnfc 1.7.1
error libnfc.driver....
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