ESP32 ESP-IDF component for TTP229 touch pad

Features

Support for 8-pad and 16-pad TTP229 configurations.
RMT-based SPI-like communication without GPIO bit-banging.
Multi-device support with unique device numbering.
FreeRTOS task for debouncing and event dispatching.
Error statistics tracking (RMT driver, event post, queue overflow, stack).
Event-based API via esp_event framework.
IRAM-safe ISR handler and RMT callback.

Attention

After start/reset first touch not work.
Multi touch not supported.

Using

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

cd ../your_project/components
git clone https://github.com/aZholtikov/zh_ttp229

In the application, add the component:

#include "zh_ttp229.h"

Examples

Basic Example: Single Device

#include "zh_ttp229.h"

#define TTP229_NUMBER 0x01

zh_ttp229_handle_t *ttp229_handle = NULL;

void zh_ttp229_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_ttp229", ESP_LOG_ERROR);
    esp_log_level_set("zh_vector", ESP_LOG_ERROR);
    esp_event_loop_create_default();
    esp_event_handler_instance_register(ZH_TTP229, ESP_EVENT_ANY_ID, &zh_ttp229_event_handler, NULL, NULL);
    zh_ttp229_init_config_t config = ZH_TTP229_INIT_CONFIG_DEFAULT();
    config.scl_gpio = GPIO_NUM_25;
    config.sdo_gpio = GPIO_NUM_27;
    config.work_mode = ZH_TTP229_16_PAD;
    config.device_number = TTP229_NUMBER;
    config.debounce_time = 300;
    config.rmt_tx_start_delay = 23;
    esp_err_t ret = zh_ttp229_init(&config, &ttp229_handle);
    if (ret != ESP_OK)
    {
        printf("TTP229 initialization error: %s\n", esp_err_to_name(ret));
        return;
    }
    for (;;)
    {
        vTaskDelay(1000 / portTICK_PERIOD_MS);
    }
    ret = zh_ttp229_deinit(&ttp229_handle);
    if (ret != ESP_OK)
    {
        printf("TTP229 deinit error: %s\n", esp_err_to_name(ret));
    }
}

void zh_ttp229_event_handler(void *arg, esp_event_base_t event_base, int32_t event_id, void *event_data)
{
    zh_ttp229_event_on_isr_t *ttp229_event = event_data;
    printf("Touch pad number %d pad number %d pressed.\n", ttp229_event->device_number, ttp229_event->pad_number);
}

Stats Example

#include "zh_ttp229.h"

#define TTP229_NUMBER 0x01

zh_ttp229_handle_t *ttp229_handle = NULL;

void zh_ttp229_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_ttp229", ESP_LOG_ERROR);
    esp_log_level_set("zh_vector", ESP_LOG_ERROR);
    esp_event_loop_create_default();
    esp_event_handler_instance_register(ZH_TTP229, ESP_EVENT_ANY_ID, &zh_ttp229_event_handler, NULL, NULL);
    zh_ttp229_init_config_t config = ZH_TTP229_INIT_CONFIG_DEFAULT();
    config.scl_gpio = GPIO_NUM_25;
    config.sdo_gpio = GPIO_NUM_27;
    config.work_mode = ZH_TTP229_16_PAD;
    config.device_number = TTP229_NUMBER;
    config.debounce_time = 300;
    config.rmt_tx_start_delay = 23;
    esp_err_t ret = zh_ttp229_init(&config, &ttp229_handle);
    if (ret != ESP_OK)
    {
        printf("TTP229 initialization error: %s\n", esp_err_to_name(ret));
        return;
    }
    for (;;)
    {
        const zh_ttp229_stats_t *stats = zh_ttp229_get_stats();
        printf("Number of RMT driver error: %ld.\n", stats->rmt_driver_error);
        printf("Number of event post error: %ld.\n", stats->event_post_error);
        printf("Number of queue overflow error: %ld.\n", stats->queue_overflow_error);
        printf("Minimum free stack size: %ld.\n", stats->min_stack_size);;
        vTaskDelay(60000 / portTICK_PERIOD_MS);
    }
    zh_ttp229_reset_stats();
    ret = zh_ttp229_deinit(&ttp229_handle);
    if (ret != ESP_OK)
    {
        printf("TTP229 deinit error: %s\n", esp_err_to_name(ret));
    }
}

void zh_ttp229_event_handler(void *arg, esp_event_base_t event_base, int32_t event_id, void *event_data)
{
    zh_ttp229_event_on_isr_t *ttp229_event = event_data;
    printf("Touch pad number %d pad number %d pressed.\n", ttp229_event->device_number, ttp229_event->pad_number);
}

Multi-Device Example

#include "zh_ttp229.h"

#define TTP229_DEVICE_1 0x01
#define TTP229_DEVICE_2 0x02

zh_ttp229_handle_t *ttp229_handle_1 = NULL;
zh_ttp229_handle_t *ttp229_handle_2 = NULL;

void zh_ttp229_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_ttp229", ESP_LOG_ERROR);
    esp_log_level_set("zh_vector", ESP_LOG_ERROR);
    esp_event_loop_create_default();
    esp_event_handler_instance_register(ZH_TTP229, ESP_EVENT_ANY_ID, &zh_ttp229_event_handler, NULL, NULL);
    zh_ttp229_init_config_t config_1 = ZH_TTP229_INIT_CONFIG_DEFAULT();
    config_1.scl_gpio = GPIO_NUM_25;
    config_1.sdo_gpio = GPIO_NUM_27;
    config_1.work_mode = ZH_TTP229_16_PAD;
    config_1.device_number = TTP229_DEVICE_1;
    config_1.debounce_time = 300;
    config_1.rmt_tx_start_delay = 23;
    esp_err_t ret = zh_ttp229_init(&config_1, &ttp229_handle_1);
    if (ret != ESP_OK)
    {
        printf("TTP229 device 1 initialization error: %s\n", esp_err_to_name(ret));
        return;
    }
    zh_ttp229_init_config_t config_2 = ZH_TTP229_INIT_CONFIG_DEFAULT();
    config_2.scl_gpio = GPIO_NUM_26;
    config_2.sdo_gpio = GPIO_NUM_28;
    config_2.work_mode = ZH_TTP229_16_PAD;
    config_2.device_number = TTP229_DEVICE_2;
    config_2.debounce_time = 300;
    config_2.rmt_tx_start_delay = 23;
    ret = zh_ttp229_init(&config_2, &ttp229_handle_2);
    if (ret != ESP_OK)
    {
        printf("TTP229 device 2 initialization error: %s\n", esp_err_to_name(ret));
        zh_ttp229_deinit(&ttp229_handle_1);
        return;
    }
    for (;;)
    {
        vTaskDelay(1000 / portTICK_PERIOD_MS);
    }
    zh_ttp229_deinit(&ttp229_handle_2);
    zh_ttp229_deinit(&ttp229_handle_1);
}

void zh_ttp229_event_handler(void *arg, esp_event_base_t event_base, int32_t event_id, void *event_data)
{
    zh_ttp229_event_on_isr_t *ttp229_event = event_data;
    printf("Touch pad number %d pad number %d pressed.\n", ttp229_event->device_number, ttp229_event->pad_number);
}