Python gpiod

DEPRECATED

위험

Official packages starting from gpiod v2 are uploaded to PyPI. https://git.kernel.org/pub/scm/libs/libgpiod/libgpiod.git

설치

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

Help command

>>> import gpiod
>>> help(gpiod)
>>> help(gpiod.chip)
>>> help(gpiod.line)
>>> help(gpiod.chip.open)

open(self, device, how:int=1)
    @brief Open a GPIO chip.

    @param device: String or int describing the GPIO chip.
    @param how:    Indicates how the chip should be opened.

    If the object already holds a reference to an open chip, it will be
    closed and the reference reset.

    Usage:
        chip.open("/dev/gpiochip0")
        chip.open(0, chip.OPEN_BY_NUMBER)

Test command

python3 -m gpiod.test.blink <chip> <line offset>
python3 -m gpiod.test.bulk_blink <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]
python3 -m gpiod.test.bulk_button <chip> <line offset> [<line offset2> ...]
    <[rising|falling|both]>

Python vs. C++

Python

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)

print(led.consumer)

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

C++

blink.cpp

#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);

    std::cout << led.consumer() << std::endl;

    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 blink.cpp -lgpiodcxx