gpio | python gpio module for linux

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python gpio module for linux using the sysfs file access (/sys/class/gpio). Mimics similar Raspberry Pi IO libraries

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Community Discussions

Trending Discussions on gpio

How to rebuild epoll package in electron?

The function pointer is changing its own address

device tree ERROR: Unable to parse input tree (syntax error)

Connecting Waveshare LCD1602 RGB to Raspberry using C#

How can I convert 8 bit array to 16 bit array in Python?

asyncio loops: how to implement asynio in an existing python program - and share variables/data?

How to control adressable RGB leds with raspberryPi in Java

Function does not work when started by multiprocess

Using a userspace driver in Linux daemon

Global variable's value doesn't change in a thread

QUESTION

How to rebuild epoll package in electron?

Asked 2022-Mar-18 at 11:41

I try to rebuild an electron app but I got this error regarding the epoll installation.

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ANSWER

Answered 2021-Nov-09 at 06:01

I have a same problem too, but i am using a serialport not epoll.

So, I think the cause of this problem is electron modules not the native module.

Source https://stackoverflow.com/questions/69882740

QUESTION

The function pointer is changing its own address

Asked 2022-Feb-17 at 07:53

I am first time using function pointers and ran into a weird problem. I am writing a code for STM32G4xx. The main idea is to transmit and receive data through LPUART. I have implemented simple FSM to handle TX and RX. LPUART configured in DMA interrupt mode. I have typedef the function pointer and declared the three function pointer variables (ISR handles) in main.h file as follow:

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ANSWER

Answered 2022-Feb-17 at 07:53

As per @Lundin's suggestion, I have put a watchpoint on lpuart_dma_rx_tc_isr_clback function pointer variable. It exposed the out of index bug in my code. The bug is inside while loop in main.c.

Source https://stackoverflow.com/questions/71139143

QUESTION

device tree ERROR: Unable to parse input tree (syntax error)

Asked 2022-Feb-16 at 16:34

I'm correctly generating my image Yocto-hardknott-technexion with this:

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ANSWER

Answered 2022-Feb-16 at 16:34

The solution was to change imx7d-pico-pi-m4.dtb to imx7d-pico-pi-qca-m4.dtb in the Yocto/Hardknott/technexion configuration file called pico-imx7.conf(described in the post)

Source https://stackoverflow.com/questions/71011872

QUESTION

Connecting Waveshare LCD1602 RGB to Raspberry using C#

Asked 2022-Jan-01 at 18:49

I am trying to connect LCD1602 RBG Waveshare to the Raspberry using C#. I connected it to the Raspberry and set the permissions, now trying to pass some data. The code below run all lines, but the LCD is not reacting. If anyone can advise me.

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ANSWER

Answered 2022-Jan-01 at 18:49

The controller for these displays is normally a HD44780 or compatible. If the python sample works fine, then this should do:

Source https://stackoverflow.com/questions/70536639

QUESTION

How can I convert 8 bit array to 16 bit array in Python?

Asked 2021-Dec-15 at 17:45

I'm transferring 16 bit numbers from a STM32 (from an ADC) over SPI to raspberry pi 4. On the pi side, I have a script that runs in a loop, waits for a GPIO pin to go high to act as a "detect" for my system to then enable the raspberry pi to initiate the SPI transfer. Unfortunately the raspberry pi hardware only supports 8 bit SPI and so the numbers I'm getting back are split across 2 x 8 bits. The data I'm transferring:

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ANSWER

Answered 2021-Dec-15 at 16:49

This is working:

Source https://stackoverflow.com/questions/70367071

QUESTION

asyncio loops: how to implement asynio in an existing python program - and share variables/data?

Asked 2021-Dec-01 at 13:04

My application needs remote control over SSH. I wish to use this example: https://asyncssh.readthedocs.io/en/latest/#simple-server-with-input

The original app is rather big, using GPIO and 600lines of code, 10 libraries. so I've made a simple example here:

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ANSWER

Answered 2021-Dec-01 at 12:51

You have basically three options:

Rewrite your main loop to be asyncio compatible

A main while True loop with lots of sleeps is exactly the kind of code you want to write asynchronously. Convert this:

Source https://stackoverflow.com/questions/70183964

QUESTION

How to control adressable RGB leds with raspberryPi in Java

Asked 2021-Nov-16 at 21:12

I have a strip of WS2811 adressable RGB leds and I am trying to control them using my raspberry pi. I am programming in java. To access the GPIO I am using a java library called Pi4j (version 1.2; java 8). This version has built-in PWM control.

My question is the following: How can I send the data to the leds trough a GPIO pin?

(I am still a beginner when it comes to physical computing, so please be gentle)

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ANSWER

Answered 2021-Nov-16 at 21:12

I haven't used NeoPixels directly on a Pi before (though I have many times used FadeCandy which is a USB LED controller that also does some nice dithering/frame blending).

Driving NeoPixels isn't as straight forward as plain PWM on individual LEDs.

There's a good Adafruit RaspberryPi NeoPixel wiring/coding tutorial. The notes on wiring/power are super useful. Even though the code is in Python, it's still useful to test/run.

Having a quick look at the pi4j documentation, while it has all the "ingredients", it doesn't have built-in support for NeoPixels. Doing a quick search I spotted the diozero library which seems to have support for NeoPixels.

I haven't tested diozero, but it's worth giving it a go.

Source https://stackoverflow.com/questions/69995901

QUESTION

Function does not work when started by multiprocess

Asked 2021-Nov-12 at 15:18

I have a C function allocates an integer, passes the pointer to a callback function before returning the pointer.

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ANSWER

Answered 2021-Nov-12 at 15:18

As the MP process needs to connect back to the pigpio daemon there needs to be a function that performs that.

Source https://stackoverflow.com/questions/69898211

QUESTION

Using a userspace driver in Linux daemon

Asked 2021-Nov-05 at 13:17

I'm trying to write a daemon that monitors the state of a USB GPIO device (Velleman VM167) and will then act on changed.

I've found a userspace driver (https://github.com/rahlskog/VM167) and have set some /etc/udev rules and ldconfig paths so that I can run the test and it works as expected.

If I compile the following it works as expected:

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ANSWER

Answered 2021-Nov-05 at 11:59

Whelp, seems I forgot to close the device each loop. That's resolved it.

CloseDevices();

Source https://stackoverflow.com/questions/69852481

QUESTION

Global variable's value doesn't change in a thread

Asked 2021-Oct-19 at 01:57

I'm making a flask application, and when the user presses a button I want for a thread to pause until the button is pressed again, and i'm planning to do this with a flag being set off. The thread can read the initial value of the flag, but when the user presses the button and the value is changed, the value remains false in the thread. It can read it successfully, but it just can't change it. I've tried making it global but it still has no effect. Here is the source -

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ANSWER

Answered 2021-Oct-19 at 01:57

You should use thread-specific features to be able share data between threads.

You may use current_thread for these purposes:

Source https://stackoverflow.com/questions/69609823

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