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README.md

ESP IO Expander Chip TCA9539 and TCA9555

Implementation of the TCA9539 and TCA9555 io expander chip with esp_io_expander component.

Chip	Communication interface	Component name	Link to datasheet
TCA9539	I2C	esp_io_expander_tca95xx_16bit	datasheet
TCA9555	I2C	esp_io_expander_tca95xx_16bit	datasheet

Add to project

Packages from this repository are uploaded to Espressif's component service. You can add them to your project via idf.py add-dependency, e.g.

    idf.py add-dependency esp_io_expander_tca95xx_16bit==1.0.0

Alternatively, you can create idf_component.yml. More is in Espressif's documentation.

Example use

Creation of the component.

    esp_io_expander_handle_t io_expander = NULL;
    esp_io_expander_new_i2c_tca95xx_16bit(1, ESP_IO_EXPANDER_I2C_TCA9539_ADDRESS_00, &io_expander);

Set pin 0 and pin 1 with output dircetion and low level:

    esp_io_expander_set_dir(io_expander, IO_EXPANDER_PIN_NUM_0 | IO_EXPANDER_PIN_NUM_1, IO_EXPANDER_OUTPUT);
    esp_io_expander_set_level(io_expander, IO_EXPANDER_PIN_NUM_0 | IO_EXPANDER_PIN_NUM_1, 0);

Print all pins's status to the log:

    esp_io_expander_print_state(io_expander);