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Questions tagged [gpio]

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x2 sudo commands cannot be executed in terminal

I am running a Ubuntu system on my Radxa Zero 3E (single board computer) Using its GPIO I am driving a 5V LED via an NPN transisitor. Everything works. For switching it on I use gpioset $(gpiofind ...
nightcrawler's user avatar
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1 answer
107 views

difference between "line-name" and "gpio-line-names" in the devicetree for gpio

I'm trying to understand why the devicetree property line-name (which can be used with gpio-hog) sets the label attribute where as gpio-line-names sets the name attribute for each gpio associated ...
Matt Schuckmann's user avatar
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How to read GPIO interrupt timing at the application layer?

I use the a40i(arm) processor and read the gpio interrupt flag at the application layer. I read the gpio flag as a character device. The gpio interrupt is given externally and has a stable 4ms period. ...
yanzhang.guo's user avatar
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Bit banging PWM on Orange PI with Rockwell chip

I've read up on bit banging and I know how it works but I don't know how to implement it. I tried just using libraries written by other people in C or python but I'm using an orange pi 3B which uses a ...
izumi's user avatar
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Arm linux interrupt binding failed

I am running the Linux 3.10 kernel on an ARM processor and writing a gpio driver. The system assigned interrupt number 182. I used the echo command to bind the core and wanted to bind the interrupt to ...
Vimer's user avatar
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Failed to use pinctrl/pinmux in port multiplexing

I am working on an embedded Linux system (kernel-5.10.24), and now I want to setup a UART port (with RXD/TXD/RTS/CTS) from 2 GPIO groups. The DTS is setting as follows, &pinctrl { uart0_pin: ...
wangt13's user avatar
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1 vote
0 answers
263 views

How to define GPIO pin as PPS source device

I'm using Linux in an embedded environment. I want to use a particular GPIO pin as a PPS source to be used with gpsd. I think the pin is configured correctly because I can see high/low transitions ...
R Mason's user avatar
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2 answers
85 views

How to read a pin state on a Raspberry Pi and select (either/or) between two entries in a cron file?

So I built an MLB scoreboard with a RPI 3. Right now the display can either show my favorite teams playing, OR all the teams playing and cycle through them as they are going on. I would like to add a ...
Joe Schmo's user avatar
1 vote
0 answers
483 views

Unable to access GPIOs on Intel Alder Lake CPU

I have a motherboard with an Alder Lake CPU on it (i9-12900E). I'm trying to access the GPIO pins on the motherboard using libgpiod. After I boot linux, I have no /dev/gpiochipX entries. When I run ...
bcattle's user avatar
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2 answers
953 views

Docker with device [GPIO] access while running as a specified user that is not `root`

We have an internal test system for our multi-platform software library which runs, with its zoo of third-party tools, inside an [Ubuntu] Docker container. To keep things simple, the host machine AND ...
Rob's user avatar
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2 answers
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gpiomon from libgpiod library seem not to behave correctly

I am trying to monitor GPIO events using libgpiod on the armbian linux. Accourding to pinout of my device (BananaPI Zero M2 /w H3 allwinner chip) I have pin CON2-P18 hooked on impulse button so I can ...
greengold's user avatar
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1 vote
0 answers
773 views

Converting to an immutable gpio chip

I have spent the last 10 hours trying to boot asahi linux on my M1 Mac, and now I can finally run the boot command. However, when I run it, there is an error message that says [0.202844] gpio ...
TedFaro's user avatar
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2 votes
0 answers
2k views

How to access gpio-keys from a shell script

In my embedded linux system, I defined some GPIOs as keys in the device tree so I can use them as keys in my application. This works fine so far. Now I want to add an early startup script to respond ...
Philippos's user avatar
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1 answer
307 views

x86: Drive a SSD1351 OLED Display

I've a bunch of SSD1351 OLED displays like this one: Those are driven over a SPI Interface and I use them in the Raspberry Pi and other ARM SBCs like the NanoPi with the following libraries: https://...
TCB13's user avatar
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How to find the relation between a USB/TTL (dev/ttyUSB_) and it's GPIO pins (/dev/gpiochip_)

I have a number of USB/TTL adapters, based on CP2102N, which have four GPIO lines. I can open one of the serial devices by /dev/ttyUSB0, and the related GPIO lines are controlled by libgpiod: /dev/...
Phil W. Gum's user avatar

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