{"id":22687321,"url":"https://github.com/dead-beef/libgpiod-frequency-counter","last_synced_at":"2025-03-29T15:43:00.619Z","repository":{"id":131249855,"uuid":"162450864","full_name":"dead-beef/libgpiod-frequency-counter","owner":"dead-beef","description":"GPIO input frequency 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libgpiod-frequency-counter\n\n[![license](https://img.shields.io/github/license/dead-beef/libgpiod-frequency-counter.svg)](\n    https://github.com/dead-beef/libgpiod-frequency-counter/blob/master/LICENSE\n)\n\n## Overview\n\nGPIO input frequency counter.\n\n## Requirements\n\n* [`libgpiod`](https://github.com/brgl/libgpiod)\n\n## Installation\n\n```\nsudo apt-get install debhelper build-essential libgpiod-dev python3-dev\ngit clone https://github.com/dead-beef/libgpiod-frequency-counter.git\ncd libgpiod-frequency-counter\nmake pkg\nsudo dpkg -i ../libgpiod-frequency-counter_0.4.0-1_*.deb ../libgpiod-frequency-counter-dev_0.4.0-1_*.deb ../gpiod-frequency_0.4.0-1_*.deb ../python3-libgpiod-frequency-counter_0.4.0-1_*.deb\n```\n\n## Usage\n\n### CLI\n\n```\n\u003e gpio-get-frequency -h\nUsage: gpio-get-frequency [-h] [-i \u003ctime\u003e] [-b \u003csize\u003e] \u003cchip name/number\u003e \u003coffset\u003e\n\nOptions:\n    -h, --help               print this help text and exit\n    -i, --interval \u003ctime\u003e    maximum time in seconds (default: none)\n    -b, --buf-size \u003csize\u003e    period buffer size (default: 32)\n```\n\n### C\n\n```c\n#include \u003cstdio.h\u003e\n#include \u003ctime.h\u003e\n#include \u003cgpiod.h\u003e\n#include \u003cgpiod_frequency_counter.h\u003e\n\nint main() {\n    enum {\n        INPUT_PIN = 4,\n        BUF_SIZE = 32\n    };\n\n    struct gpiod_chip *chip = NULL;\n    struct gpiod_line *input_line = NULL;\n    gpiod_frequency_counter counter;\n    struct timespec interval;\n\n    interval.tv_sec = 0;\n    interval.tv_nsec = 500000000;\n\n    chip = gpiod_chip_open(\"/dev/gpiochip0\");\n    input_line = gpiod_chip_get_line(chip, INPUT_PIN);\n\n    gpiod_frequency_counter_init(\u0026counter, input_line, BUF_SIZE);\n\n    while (1) {\n        gpiod_frequency_counter_count(\u0026counter, BUF_SIZE, \u0026interval);\n        double period = gpiod_frequency_counter_get_period(\u0026counter);\n        double frequency = gpiod_frequency_counter_get_frequency(\u0026counter);\n        double duty_cycle = gpiod_frequency_counter_get_duty_cycle(\u0026counter);\n\n        fputs(\"\\x1b[2K\\r\", stdout);\n        printf(\n            \"period=%.06lfs frequency=%.06lfHz duty_cycle=%.02lf \",\n            period,\n            frequency,\n            duty_cycle\n        );\n        fflush(stdout);\n    }\n\n    gpiod_frequency_counter_destroy(\u0026counter);\n    gpiod_chip_close(chip);\n    return 0;\n}\n```\n\n### Python\n\n```python\n#!/usr/bin/env python3\n\nimport sys\n\nfrom gpiod import Chip\nfrom gpiod_frequency_counter import FrequencyCounter\n\nchip = 'gpiochip0'\nline = 4\n\nwith Chip(chip, Chip.OPEN_BY_NAME) as chip:\n    line = chip.get_line(line)\n    buf_size = 32\n    timeout_sec = 1\n    timeout_nsec = 0\n    counter = FrequencyCounter(line, buf_size)\n    try:\n        while True:\n            counter.count(buf_size, timeout_sec, timeout_nsec)\n            print(\n                '\\x1b[2K\\r'\n                f'period={counter.period:.04f}s '\n                f'frequency={counter.frequency:.04f}Hz '\n                f'duty_cycle={counter.duty_cycle:.02f} ',\n                end=''\n            )\n            sys.stdout.flush()\n    except KeyboardInterrupt:\n        pass\n```\n\n## Licenses\n\n* [`libgpiod-frequency-counter`](https://github.com/dead-beef/libgpiod-frequency-counter/blob/master/LICENSE)\n","project_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fdead-beef%2Flibgpiod-frequency-counter","html_url":"https://awesome.ecosyste.ms/projects/github.com%2Fdead-beef%2Flibgpiod-frequency-counter","lists_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fdead-beef%2Flibgpiod-frequency-counter/lists"}