# ESP32 ESP-IDF and ESP8266 RTOS SDK component for rotary encoder

## Tested on

1. [ESP8266 RTOS_SDK v3.4](https://docs.espressif.com/projects/esp8266-rtos-sdk/en/latest/index.html#)
2. [ESP32 ESP-IDF v5.4](https://docs.espressif.com/projects/esp-idf/en/release-v5.4/esp32/index.html)

## Features

1. Support some encoders on one device.

## Note

1. Encoder pins must be pull up to the VCC via 0.1 µf capacitors.

## Using

In an existing project, run the following command to install the components:

```text
cd ../your_project/components
git clone http://git.zh.com.ru/alexey.zholtikov/zh_encoder
```

In the application, add the component:

```c
#include "zh_encoder.h"
```

## Examples

One encoder on device:

```c
#include "zh_encoder.h"

zh_encoder_handle_t encoder_handle = {0};

void zh_encoder_event_handler(void *arg, esp_event_base_t event_base, int32_t event_id, void *event_data);

void app_main(void)
{
    esp_log_level_set("zh_encoder", ESP_LOG_NONE); // For ESP8266 first enable "Component config -> Log output -> Enable log set level" via menuconfig.
    esp_event_loop_create_default();
#ifdef CONFIG_IDF_TARGET_ESP8266
    esp_event_handler_register(ZH_ENCODER, ESP_EVENT_ANY_ID, &zh_encoder_event_handler, NULL);
#else
    esp_event_handler_instance_register(ZH_ENCODER, ESP_EVENT_ANY_ID, &zh_encoder_event_handler, NULL, NULL);
#endif
    zh_encoder_init_config_t encoder_init_config = ZH_ENCODER_INIT_CONFIG_DEFAULT();
    encoder_init_config.a_gpio_number = GPIO_NUM_27;
    encoder_init_config.b_gpio_number = GPIO_NUM_26;
    // encoder_init_config.encoder_min_value = -10; // Just for example.
    // encoder_init_config.encoder_max_value = 20;  // Just for example.
    // encoder_init_config.encoder_step = 0.1;      // Just for example.
    encoder_init_config.encoder_number = 1;
    zh_encoder_init(&encoder_init_config, &encoder_handle);
    double position = 0;
    zh_encoder_get(&encoder_handle, &position);
    printf("Encoder position %0.2f.\n", position); // For ESP8266 first disable "Component config -> Newlib -> Enable ‘nano’ formatting options for printf/scanf family" via menuconfig.
    // zh_encoder_set(&encoder_handle, 5); // Just for example.
    // zh_encoder_reset(&encoder_handle);  // Just for example.
}

void zh_encoder_event_handler(void *arg, esp_event_base_t event_base, int32_t event_id, void *event_data)
{
    zh_encoder_event_on_isr_t *event = event_data;
    printf("Encoder number %d position %0.2f.\n", event->encoder_number, event->encoder_position); // For ESP8266 first disable "Component config -> Newlib -> Enable ‘nano’ formatting options for printf/scanf family" via menuconfig.
}
```