sheldonix/esp_io_expander_xl9555

# esp-io-expander-xl9555 ESP-IDF component driver for the XL9555 I/O expander. Built on the official `esp_io_expander` base interface. ## Install Use the ESP-IDF component manager: ```bash idf.py add-dependency "sheldonix/esp_io_expander_xl9555^0.8.0" ``` ## Usage ```c #include "esp_io_expander.h" #include "esp_io_expander_xl9555.h" esp_io_expander_handle_t expander = NULL; ESP_ERROR_CHECK(esp_io_expander_new_i2c_xl9555(bus_handle, 0x20, &expander)); ESP_ERROR_CHECK(esp_io_expander_set_dir(expander, IO_EXPANDER_PIN_NUM_0, IO_EXPANDER_OUTPUT)); ESP_ERROR_CHECK(esp_io_expander_set_level(expander, IO_EXPANDER_PIN_NUM_0, 1)); ``` ## Examples Two ESP-IDF example projects are provided: - `examples/xl9555_basic`: Toggle a single output pin (default P0) every 500 ms. - `examples/xl9555_input`: Read a single input pin (default P0) every 500 ms. Build and flash an example: ```bash cd examples/xl9555_basic idf.py set-target esp32s3 idf.py menuconfig idf.py build flash monitor ``` Each example exposes its own menu in `idf.py menuconfig`: - `XL9555 Basic Example` - `XL9555 Input Example` ## Configuration Kconfig options: ```text XL9555_I2C_TIMEOUT_MS I2C transaction timeout XL9555_DEFAULT_OUTPUT Default output register value (16-bit) ``` Note: XL9555 does not provide internal pull-ups/pull-downs; ensure external circuitry sets a defined input level. ## Contributing Contributions are welcome! Please feel free to submit a Pull Request. For major changes, please open an issue first to discuss what you would like to change. See [CONTRIBUTING.md](./CONTRIBUTING.md) for guidelines. [![GitHub](https://img.shields.io/badge/Github-sheldonix%2Fesp_io_expander_xl9555-green?logo=github)](https://github.com/sheldonix/esp_io_expander_xl9555) ## License [Apache-2.0](./LICENSE)

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License: Apache-2.0

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