Questions tagged [wiringpi]
WiringPi is a C language library for accessing GPIO pins.
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Why is digitalRead/digitalWrite not working in C++ nor in gpio terminal commands?
I'm writing in C++ using WiringPi to integrate with GPIO but it doesn't seem to work during runtime.
Below I have a simple example of an output wired to an input expecting the input to read HIGH, but ...
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1
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wiringPi giving "Unable to determine board revision from /proc/cpuinfo" error after kernel 6.1 update
I was using wiringPi to to control the GPIO pins on a Raspberry Pi model 3 and 4b (these originally had Buster installed on them) successfully until today when I did a rpi-update to get kernel 6.1.
...
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How to interface 6 HC-SR04 ultrasonic sensors rasberry pi
I am a beginner to Rasberry Pi and working on a parking warning system for a go-kart. The plan is to use 6 ultrasonic sensors (3 at the front of the kart and 3 at the back) to achieve distance ...
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How to use libwiringPi.so for cross compiling using CMake?
I'm trying to use CMake to cross compile a C++ code using the Wiring Pi library but I'm having trouble with making CMake to find said the correct library. Since I'm compiling from x86 to ARM in order ...
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1
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129
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Which GPIOs can I use to shutdown Pi 4?
I am using a Pi 4 with Raspian, writing a program in Python (3.9.2) to do (amongst other things) shutdown of the Pi via a physical button. Based on this link https://linuxhint.com/set-up-shutdown-...
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2
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118
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Why does the ssh connection freeze when accessing gpio pins
What is the proper method to use when creating a blinking LED example using PI zero W
I connected the cathode to GPIO 37 and the anode to GND next I sshed into the pi and wrote this code
import ...
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2
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wiringpi is missing from bullseye. how do i install it?
I get the following when trying to install wiring pi on a fresh bullseye image. Anyone have any way to get it installed?
$ sudo apt-get install wiringpi
Reading package lists... Done
Building ...
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1
answer
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Wiegand wiring guidance on Pi 4 with voltage step-down
Ok so following on from my previous post here. I have decided to start with the Wiegand wiring interface. I've drawn a diagram below to illustrate how I plan to wire everything up. Would appreciate if ...
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Using WiringPi with more than two chip selects and MCP3008
I am trying to get more than two chip selects available on the Pi. I have the devices present, but am struggling to read a MCP3008 when the CS is plugged into the additional GPIO pins. My end goal is ...
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How fast are C & Python libraries
I ran some code to monitor Pi hysteresis which involved mirroring a GPIO input to output. I was surprised as how slow the code was, so wrote a C version. Although this was slightly better it was still ...
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wiringPi compile issue on RPi 4B 64bit
I am trying to compile my C++ project using CMake. My Raspberry Pi OS does include /usr/include/wiringPi.h and all the required .so files in /usr/lib/. Here is the output of gpio -v command:
gpio ...
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Access Multiple I2C Ports on Raspberry Pi CM4
I am working on the Raspberry Pi Compute Module 4. I would like to implement the 2 I2C ports for the 2 different types of sensors. (must be accessed within a single application)
I am using the I2C ...
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1
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WiringPi INPUT causes voltage below nominal 3.3v on pin with pull-up
Libs:
wiringPi
Hardware:
Pull-up resistor (10k) to 3.3v on GPIO 24 (=THERMO_BUTTON_PIN)
floating GPIO 4 (=AUDIO_BUTTON_PIN)
In short, I want to implement an auto-recognition for one of two ...
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1
answer
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How to toggle RPi GPIO without system call
I want to toggle GPIO from within my C application, and be sure that it won't call kernel functions. Is wiringPi a good solution to do that, or should I do it another way?
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multiple UARTs on the 40-pin
i am trying to connect two devices via UART to a raspberry 4. one being a stepper driver (i dont need much throughput), one being an image sensor (the higher the baud rate is i can get, the better). ...
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fatal error: wiringPi.h: No such file or directory
Learning cmake for use with CLion. I have a raspberry pi project and I'm trying to bring in wiringPi library on my Ubuntu box. Here's my build results.
====================[ Build | rookery_exe | ...
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209
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Raspberry Pi: How to check I2C Bus Busy Status in Multi-Master mode
I am working on the Wiring Pi I2C Example codes.
In my case, I am using the 2 masters over the same I2C Bus.
I am getting some errors like
0x00 + Missing ACK/NAK
Even the Clock pulse is not in 50% ...
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2
answers
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How to check if wiringPiSetup() was run
I am working on a C++ project using several objects that use wiringPi. When I initialize the objects each runs wiringPiSetup() in their constructor. If I test the objects individually all o them work. ...
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1
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62
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magnetic field generated by the engine alternator affects gpio value
I am working on a dashboard for a motorcycle. I created a Qt application on my raspberry pi 4 on a raspberry pi os lite.
I have configured one of my GPIO as interrupt using the wiringPi library.
...
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502
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WiringPi SPI without Chip Select/Enable?
I am wondering how the WiringPi SPI works without using the chip select/enable spi.cs_change = true; in the following code.
int wiringPiSPIDataRW (int channel, unsigned char *data, int len)
{
struct ...
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How to read SPI memory with raspberry pi? (using wiringpi)
This is the pinout I have for the flash memory W25Q128FV which I'm trying to interact with
I'm trying to control it with a raspberry pi 3 B+.
Here's how I wired everything:
CS - GND
D0 - SPIMISO
WP - ...
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234
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How to use 4 CS for SPI in C++
I'm currently trying to implement 4 CS in RaspPi. I'm still a newby in this field and used the library wiringPi. For CS0 and CS1 this works totally fine.
However now I have 2 more CS on the GPIO Pin ...
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Raspberry Pi Software Driven servo control with PWM using C and Wiring Pi LIbrary
I'm trying to get my raspi zero to move an SG90 PWM driven servo. I have achieved this with python already using the gpiozero library, so I know my hardware works but I am trying to do it with C using ...
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GPIO pins not changing state
I have Raspberry pi 4B, and I want to interact with the GPIO pins. I connected simple LED wiring to physical pin's 37(GPIO25) and 39(GND). After exported pin, and set up mode to "out", I ...
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GPIO not working on Raspberry PI 4 4GB
I have a RPi 4 running Raspbian with the Ubuntu Mate desktop environment, whenever I try to use the Wiring Pi library through a C script, to doesn't work at all. On using the gpio readall command I ...
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Rotary encoder working on Pi 3 but not on Pi 4
I'm trying to read an encoder switch using wiringPi (latest, 2.52). Whenever there is an edge on either of the encoding pins a or b, I store a snapshot of the state of both pins on two bits:
int val = ...
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2
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wiringPi.h not found by gcc. Works in Raspian, not Ubuntu Mate
This is my first time posting on stack exchange so I apologize if this is too much or not enough info on the problem.
A few months ago I installed Ubuntu Mate 18.04 on a Raspberry Pi 3B+ and tried to ...
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1k
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how to use MCP23S17 pin expander via SPI
I'm working on a custom sensor that is wired to a couple of MCP23S17 gpio expanders, which are in term connected to a Raspberry Pi 4 via the SPI pins i.e. SPI_MOSI, SPI_MISO, SPI_SCLK and CE0 pin.
I'm ...
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Enabling of I2C-0 via "dtparam=i2c_vc=on" on Pi 3B+ causes "I2C-10" & "I2C-11" to appear and disables GPIO 10 GPIO 11
For reference:
I am using the latest release Pi OS Lite, Aug 2020 version.
I am developing an application using Pi4J.
I am referring to pins via this Pinout: Pin Numbering - Raspberry Pi 3B+
I am ...
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3
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219
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says i don't have wiringpi module when runing code at startup
I have a code set up to run at boot, and it works fine when I start it via terminal, but it doesn't run at boot. I opened the terminal, and this is what I saw:
Running at boot
Traceback (most recent ...
user121626
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278
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I2C, SPI and Python Libraries with Raspberry Pi 4b
I've been working with RPi.GPIO so far but I have had issues with PWM and edge detection, which are well known issues with RPi.GPIO, anyway, after some research I'm considering using a different ...
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Can't get to toggle leds with WiringPi library in C
So I got my python code to run that basically just toggles the LED, but now I tried enabling the GPIO via WiringPi library in C but it doesn't work. Considering python code runs, there isn't really ...
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libpgiod vs wiringPI code/configuration
I have an RPI, setup with wiringPi and some code I wrote to read a quadrature encoder. It works just fine, I can read the pins, using a wiringPiISR mechanism (the ISRs get executed on the rising as ...
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2
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368
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Output resistors and GPIO
I am planning to control a IC (CD74HCT299E). I have currently GPIO-pins directly hooked up to the IC. My Question is, does the Raspberry pi have resistors before the GPIO-pin, or do I have to or ...
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342
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Running pump & servo - Relay needed?
simulate this circuit – Schematic created using CircuitLab
So I am working on a project that will require both a servo motor plus a small water pump.
Both run on 3.7 -6v and I am going to use ...
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1
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How to write 16 bit data to device address using the i2c wiringpi lib
I am trying to write 16 bit data to i2c device . As there are no registers specified to write to the slave device, I am not able to use the built-in wiringPiI2CWriteReg16 Api.
Can some one guide me ...
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gcc and g++ compilers don't find wiringPiSetup() and wiringPiI2CSetup() functions
Update/solution:
The sample program(s) Gordon refers to are at github/wiringPi - specifically for me lcd-adafruit.c. On my Rpi, the correct libraries are in /usr/lib and are libwiringPi.so and ...
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How do I hold SPI high value?
I'm using wiringPi spi library to communicate two raspberries. As the spi clks aren't synchronised, I don't read the high values, since they are only a pulse. Is there a way to hold the high value ...
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Controlling PWM by wiringpi through python programming [closed]
Can anyone give me the program for controlling PWM by wiringpi through python programming?
I have already searched on the net but could only find program through C programming.
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Initializer element is not constant serialOpen WiringPi
I'm getting an error when trying to run some code on my raspberry pi. Here is the source code:
/*
SimpleReceive
This sketch displays text strings received using VirtualWire
Connect the Receiver data ...
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351
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Can't read data from PN532 NFC reader over SPI
I'm using Pi4J library to read data from a NFC reader based on PN532, connected to my Pi via SPI. However, I don't seem to receive any data from if when I put a NFC card to my reader.
I'm using SPI0 ...
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Crontab with WiringPi
I want to change pin state at certain time with Crontab.
I tried to use this command: 7 0 * * * /usr/bin/gpio -g write 0 0
but it returns me this error: bash: 7: command not found
I also tried: 7 0 * ...
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Changing speed of a stepper motor break the rotation smoothness?
I'm using node-stepper-wiringpi with the L298N driver (12V) to control a stepper motor.
If i put a speed of 30 the rotation is smooth but if i put more than 30 the stepper struggle to make the ...
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2
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2k
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GPIO pullups not working?
Sorry for the very basic question. I am trying to set a built-in pullup on GPIO pins and it doesn't seem to be working. Hardware is Pi 3B and 4B (I tried on both), OS is Raspbian 10 (buster). The ...
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WiringPi and ADS1115 C/C++ sample programs
I am trying to create c++/c program to AnalogRead using and ADS1115. I have seen that wiringPi has support for ADS1115 but i could not find any sample program to start with. Can anybody link guide me ...
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Setting Pull Up/Pull Down mode doesn't work (mostly)
I can't seem to set the pull-up resistor mode on the PI4 with most methods I try. I have tried: C# (the new System.Device.Gpio interface), WiringPi (using a C# abstraction), and wiringPi command line ...
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using Pi Zero W GPIO relay control
I am trying to control my relay with Raspberry GPIO.
Using the terminal to write to gpio5 (Physical 18, BCM 24) works:
gpio mode 5 out
gpio write 5 1
Trying to do the same in my c++ code doesn't ...
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2
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Wiring Pi Issue - #!/bin/bash vs #!/bin/sh
I am working on a project and have an application shell script. For function part, I need the GPIO access, and for that, I am using the standard wiringpi
package.
The issue I am getting is with the #...
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How rpi3 as slave use i2c with wiringPi
I tried to let my rpi3 with wiringPi as slave to receive data from master
and data +1 send to master .
mater send 1 to slave (rpi3)
My rpi3 SDA is GPIO 18 ,SLC is GPIO 19
the code on my rpi3 :
#...
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How to use at the same time 2 hardware pwm in wiringpi
I need help to configure 2 hardware PWM channels. I am developing device, and sometimes I will need active 2 PWM channels with different frequencies (frequencies is low: 410 and 580 Hz).I'm writing ...
