readme
# ESP IO Expander Chip TCA9554(A)
Implementation of the TCA9554 io expander chip with esp_io_expander component.
| Chip | Communication interface | Component name | Link to datasheet |
| :--------------: | :---------------------: | :------------: | :---------------: |
| TCA9554(A) | I2C | esp_io_expander_tca9554 | [datasheet](https://www.ti.com/lit/gpn/tca9554) |
## Add to project
Packages from this repository are uploaded to [Espressif's component service](https://components.espressif.com/).
You can add them to your project via `idf.py add-dependency`, e.g.
```
idf.py add-dependency esp_io_expander_tca9554==1.0.0
```
Alternatively, you can create `idf_component.yml`. More is in [Espressif's documentation](https://docs.espressif.com/projects/esp-idf/en/latest/esp32/api-guides/tools/idf-component-manager.html).
## Example use
Creation of the component.
```
esp_io_expander_handle_t io_expander = NULL;
esp_io_expander_new_i2c_tca9554(1, ESP_IO_EXPANDER_I2C_TCA9554_ADDRESS_000, &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);
```