gpiod 0.6.0

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python3-gpiod

Ref: https://git.kernel.org/pub/scm/libs/libgpiod/libgpiod.git

Installation

sudo apt update \
&& sudo apt install -y python3 python3-dev python3-pip pkg-config \
    gpiod libgpiod-dev

python3 -m pip install -U --user pip gpiod

If you see "OSError: pkg-config: Failed to find libgpiodcxx.", you need to install libgpiodcxx manually.

sudo apt purge -y gpiod libgpiod-dev

sudo apt install -y git libtool autoconf-archive

git clone git://git.kernel.org/pub/scm/libs/libgpiod/libgpiod.git \
&& cd libgpiod

If the kernel version is 5.4 or lower, use git checkout v1.4.2 to change the version.(Change it to v1.1 or more and less than v1.5)

./autogen.sh --enable-tools=yes --prefix=/usr --enable-bindings-cxx \
&& make \
&& sudo make install

python3 -m pip install -U --user gpiod

help command

>>> import gpiod
>>> help(gpiod)
>>> help(gpiod.chip)
>>> help(gpiod.chip.get_line)

Help on instancemethod in module gpiod._gpiod:

get_line(...)
    get_line(self: gpiod._gpiod.chip, offset: int) -> gpiod::line

    /**
     * @brief Get the line exposed by this chip at given offset.
     * @param offset Offset of the line.
     * @return Line object.
     */

Test

python3 -m gpiod.test.blink <chip> <line offset>
python3 -m gpiod.test.blinks <chip> <line offset1> [<line offset2> ...]
python3 -m gpiod.test.sequential_blink <chip> <line offset1> \
    [<line offset2> ...]
python3 -m gpiod.test.button <chip> <line offset> [rising|falling|both]

Blink example

Python3

import gpiod
import sys
import time

if len(sys.argv) > 2:
    LED_CHIP = sys.argv[1]
    LED_LINE_OFFSET = int(sys.argv[2])
else:
    print('''Usage:
    python3 blink.py <chip> <line offset>''')
    sys.exit()

chip = gpiod.chip(LED_CHIP)
led = chip.get_line(LED_LINE_OFFSET)

config = gpiod.line_request()
config.consumer = "Blink"
config.request_type = gpiod.line_request.DIRECTION_OUTPUT

led.request(config)

while True:
    led.set_value(0)
    time.sleep(0.1)
    led.set_value(1)
    time.sleep(0.1)

C++

#include <chrono>
#include <cstdlib>
#include <gpiod.hpp>
#include <iostream>
#include <string>
#include <thread>

int main(int argc, char **argv) {
    std::string LED_CHIP;
    int         LED_LINE_OFFSET;

    if(argc > 2) {
        LED_CHIP        = argv[1];
        LED_LINE_OFFSET = std::stoi(argv[2]);
    } else {
        std::cout << "Usage:" << std::endl
                  << "    ./blink <chip> <line offset>" << std::endl;
        std::exit(0);
    }

    gpiod::chip chip(LED_CHIP);
    gpiod::line led = chip.get_line(LED_LINE_OFFSET);

    gpiod::line_request config;
    config.consumer     = "Blink";
    config.request_type = gpiod::line_request::DIRECTION_OUTPUT;

    led.request(config);

    while(1) {
        led.set_value(0);
        std::this_thread::sleep_for(std::chrono::milliseconds(100));
        led.set_value(1);
        std::this_thread::sleep_for(std::chrono::milliseconds(100));
    }
}

g++ -o blink test.cpp -lgpiodcxx

Changelog

Ref: CHANGELOG

python3-gpiod (0.6.0) unstable; urgency=medium

• Fix issue where 'setup.py clean' is not executed
• Correct error messages to be noticeable
• Fix iterator in line_bulk class

-- Hyeonki Hong [e-mail] Thu, 02 Apr 2020 14:55:17 +0900

python3-gpiod (0.5.4) unstable; urgency=medium

• Update README.md

-- Hyeonki Hong [e-mail] Mon, 30 Mar 2020 20:04:10 +0900

python3-gpiod (0.5.3) unstable; urgency=medium

• Add std::bitset<32> type caster

-- Hyeonki Hong [e-mail] Thu, 26 Mar 2020 11:39:33 +0900

python3-gpiod (0.5.2) unstable; urgency=medium

• Add documentation for tested methods
• Add test code
• Update README.md

-- Hyeonki Hong [e-mail] Fri, 20 Mar 2020 13:17:41 +0900

python3-gpiod (0.5.1) unstable; urgency=medium

• Move xxx class into xxx_wrapper.h
• Add blink test module

-- Hyeonki Hong [e-mail] Fri, 20 Mar 2020 00:58:05 +0900

python3-gpiod (0.5.0) unstable; urgency=medium

• Add pybind11/chrono.h for std::chrono
• Prevent installation if libgpiodcxx v1.0 or lower
• Add xxx_lines into chip class
• Add operators
• Add MAX_LINES attribute
• Fix issue where 'setup.py sdist' is not executed

-- Hyeonki Hong [e-mail] Sat, 14 Mar 2020 02:37:13 +0900

python3-gpiod (0.4.1) unstable; urgency=medium

• Fix issue where pip does not install dependencies

-- Hyeonki Hong [e-mail] Thu, 12 Mar 2020 19:11:24 +0900

python3-gpiod (0.4.0) unstable; urgency=medium

• Add libgpiodcxx version check
• Remove -std=c++11 option
• Add line_bulk, chip_iter, line_iter classes

-- Hyeonki Hong [e-mail] Thu, 12 Mar 2020 14:18:16 +0900

python3-gpiod (0.3.0) unstable; urgency=medium

• Add open, reset function
• Add LICENSE
• Create README.md

-- Hyeonki Hong [e-mail] Wed, 11 Mar 2020 18:58:14 +0900

python3-gpiod (0.2.0) unstable; urgency=medium

• Add chip, line_request, line, line_event class

-- Hyeonki Hong [e-mail] Wed, 11 Mar 2020 13:28:45 +0900

python3-gpiod (0.1.0) unstable; urgency=medium

• Add initial setup files

-- Hyeonki Hong [e-mail] Tue, 10 Mar 2020 15:40:13 +0900