Unanswered Questions
9,568 questions with no upvoted or accepted answers
9
votes
1
answer
2k
views
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 ...
- 149
7
votes
0
answers
1k
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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 ...
- 103
7
votes
0
answers
895
views
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, ...
- 71
6
votes
1
answer
2k
views
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 ...
- 169
6
votes
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 ...
- 61
6
votes
0
answers
486
views
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
votes
0
answers
319
views
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 ...
- 69
6
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 ...
- 429
6
votes
0
answers
2k
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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 ...
- 61
6
votes
0
answers
2k
views
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?
6
votes
1
answer
10k
views
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 ...
- 541
6
votes
2
answers
416
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 -- -- -...
- 320
6
votes
1
answer
808
views
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: ...
- 61
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 ...
- 159
6
votes
0
answers
2k
views
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 ...
- 161