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idf_component_register(SRCS "esp_lcd_touch_cst816s.c" INCLUDE_DIRS "include" REQUIRES "esp_lcd")

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menu "ESP LCD TOUCH - CST816S"
config ESP_LCD_TOUCH_CST816S_DISABLE_READ_ID
bool "Disable reading ID during initialization"
default n
help
For some CST816 series chips, reading ID may cause initialization failure.
endmenu

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# ESP LCD Touch CST816S Controller
[![Component Registry](https://components.espressif.com/components/espressif/esp_lcd_touch_cst816s/badge.svg)](https://components.espressif.com/components/espressif/esp_lcd_touch_cst816s)
Implementation of the CST816S touch controller with esp_lcd_touch component.
| Touch controller | Communication interface | Component name | Link to datasheet |
| :--------------: | :---------------------: | :-------------------: | :------------------------------------------------------------------------: |
| CST816S | I2C | esp_lcd_touch_cst816s | [datasheet](https://www.buydisplay.com/download/ic/DS-CST816S_DS_V1.3.pdf) |
> [!NOTE]
> * There are two things about the driver are noteworthy (from [document](https://doc.riot-os.org/group__drivers__cst816s.html)):
> * It only responds to I2C commands after an event, such as a touch detection. Do not expect it to respond on init. Instead after a touch event, it will assert the IRQ and respond to I2C reads for a short time.
> * While it should be able to detect multiple finger events, this version of the chip always returns only a single finger event and a gesture. Reading the display data multiple times during a single event will return the last sampled finger position.
> * For some chips, reading ID may cause initialization failure. Disable reading ID by setting `CONFIG_ESP_LCD_TOUCH_CST816S_DISABLE_READ_ID` to `y` in `menuconfig`.
## 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-dependancy`, e.g.
```
idf.py add-dependency esp_lcd_touch_cst816s==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
Define a mutex for the touch and create it before initialize the touch:
```
static SemaphoreHandle_t touch_mux;
touch_mux = xSemaphoreCreateBinary();
```
Define a callback function used by ISR:
```
static void touch_callback(esp_lcd_touch_handle_t tp)
{
BaseType_t xHigherPriorityTaskWoken = pdFALSE;
xSemaphoreGiveFromISR(touch_mux, &xHigherPriorityTaskWoken);
if (xHigherPriorityTaskWoken) {
portYIELD_FROM_ISR();
}
}
```
Initialization of the touch component.
```
esp_lcd_panel_io_i2c_config_t io_config = ESP_LCD_TOUCH_IO_I2C_CST816S_CONFIG();
esp_lcd_touch_config_t tp_cfg = {
.x_max = CONFIG_LCD_HRES,
.y_max = CONFIG_LCD_VRES,
.rst_gpio_num = CONFIG_LCD_TOUCH_RST,
.int_gpio_num = CONFIG_LCD_TOUCH_INT,
.levels = {
.reset = 0,
.interrupt = 0,
},
.flags = {
.swap_xy = 0,
.mirror_x = 0,
.mirror_y = 0,
},
.interrupt_callback = touch_callback,
};
esp_lcd_touch_handle_t tp;
esp_lcd_touch_new_i2c_cst816s(io_handle, &tp_cfg, &tp);
```
Read data from the touch controller and store it in RAM memory. It should be called regularly in poll.
```
if (xSemaphoreTake(touch_mux, 0) == pdTRUE) {
esp_lcd_touch_read_data(tp); // read only when ISR was triggled
}
```
Get one X and Y coordinates with strength of touch.
```
uint16_t touch_x[1];
uint16_t touch_y[1];
uint16_t touch_strength[1];
uint8_t touch_cnt = 0;
bool touchpad_pressed = esp_lcd_touch_get_coordinates(tp, touch_x, touch_y, touch_strength, &touch_cnt, 1);
```

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/*
* SPDX-FileCopyrightText: 2015-2025 Espressif Systems (Shanghai) CO LTD
*
* SPDX-License-Identifier: Apache-2.0
*/
#include <inttypes.h>
#include <stdio.h>
#include <string.h>
#include "freertos/FreeRTOS.h"
#include "freertos/task.h"
#include "driver/gpio.h"
#include "esp_system.h"
#include "esp_err.h"
#include "esp_log.h"
#include "esp_check.h"
#include "esp_lcd_panel_io.h"
#include "esp_lcd_touch.h"
#define POINT_NUM_MAX (1)
#define DATA_START_REG (0x02)
#define CHIP_ID_REG (0xA7)
static const char *TAG = "CST816S";
static esp_err_t read_data(esp_lcd_touch_handle_t tp);
static bool get_xy(esp_lcd_touch_handle_t tp, uint16_t *x, uint16_t *y, uint16_t *strength, uint8_t *point_num, uint8_t max_point_num);
static esp_err_t del(esp_lcd_touch_handle_t tp);
static esp_err_t i2c_read_bytes(esp_lcd_touch_handle_t tp, uint16_t reg, uint8_t *data, uint8_t len);
static esp_err_t reset(esp_lcd_touch_handle_t tp);
static esp_err_t read_id(esp_lcd_touch_handle_t tp);
esp_err_t esp_lcd_touch_new_i2c_cst816s(const esp_lcd_panel_io_handle_t io, const esp_lcd_touch_config_t *config, esp_lcd_touch_handle_t *tp)
{
ESP_RETURN_ON_FALSE(io, ESP_ERR_INVALID_ARG, TAG, "Invalid io");
ESP_RETURN_ON_FALSE(config, ESP_ERR_INVALID_ARG, TAG, "Invalid config");
ESP_RETURN_ON_FALSE(tp, ESP_ERR_INVALID_ARG, TAG, "Invalid touch handle");
/* Prepare main structure */
esp_err_t ret = ESP_OK;
esp_lcd_touch_handle_t cst816s = calloc(1, sizeof(esp_lcd_touch_t));
ESP_GOTO_ON_FALSE(cst816s, ESP_ERR_NO_MEM, err, TAG, "Touch handle malloc failed");
/* Communication interface */
cst816s->io = io;
/* Only supported callbacks are set */
cst816s->read_data = read_data;
cst816s->get_xy = get_xy;
cst816s->del = del;
/* Mutex */
cst816s->data.lock.owner = portMUX_FREE_VAL;
/* Save config */
memcpy(&cst816s->config, config, sizeof(esp_lcd_touch_config_t));
/* Prepare pin for touch interrupt */
if (cst816s->config.int_gpio_num != GPIO_NUM_NC) {
const gpio_config_t int_gpio_config = {
.mode = GPIO_MODE_INPUT,
.intr_type = (cst816s->config.levels.interrupt ? GPIO_INTR_POSEDGE : GPIO_INTR_NEGEDGE),
.pin_bit_mask = BIT64(cst816s->config.int_gpio_num)
};
ESP_GOTO_ON_ERROR(gpio_config(&int_gpio_config), err, TAG, "GPIO intr config failed");
/* Register interrupt callback */
if (cst816s->config.interrupt_callback) {
esp_lcd_touch_register_interrupt_callback(cst816s, cst816s->config.interrupt_callback);
}
}
/* Prepare pin for touch controller reset */
if (cst816s->config.rst_gpio_num != GPIO_NUM_NC) {
const gpio_config_t rst_gpio_config = {
.mode = GPIO_MODE_OUTPUT,
.pin_bit_mask = BIT64(cst816s->config.rst_gpio_num)
};
ESP_GOTO_ON_ERROR(gpio_config(&rst_gpio_config), err, TAG, "GPIO reset config failed");
}
/* Reset controller */
ESP_GOTO_ON_ERROR(reset(cst816s), err, TAG, "Reset failed");
/* Read product id */
#ifdef CONFIG_ESP_LCD_TOUCH_CST816S_DISABLE_READ_ID
ESP_LOGI(TAG, "Read ID disabled");
#else
ESP_GOTO_ON_ERROR(read_id(cst816s), err, TAG, "Read ID failed");
#endif
*tp = cst816s;
return ESP_OK;
err:
if (cst816s) {
del(cst816s);
}
ESP_LOGE(TAG, "Initialization failed!");
return ret;
}
static esp_err_t read_data(esp_lcd_touch_handle_t tp)
{
typedef struct {
uint8_t num;
uint8_t x_h : 4;
uint8_t : 4;
uint8_t x_l;
uint8_t y_h : 4;
uint8_t : 4;
uint8_t y_l;
} data_t;
data_t point;
ESP_RETURN_ON_ERROR(i2c_read_bytes(tp, DATA_START_REG, (uint8_t *)&point, sizeof(data_t)), TAG, "I2C read failed");
portENTER_CRITICAL(&tp->data.lock);
point.num = (point.num > POINT_NUM_MAX ? POINT_NUM_MAX : point.num);
tp->data.points = point.num;
/* Fill all coordinates */
for (int i = 0; i < point.num; i++) {
tp->data.coords[i].x = point.x_h << 8 | point.x_l;
tp->data.coords[i].y = point.y_h << 8 | point.y_l;
}
portEXIT_CRITICAL(&tp->data.lock);
return ESP_OK;
}
static bool get_xy(esp_lcd_touch_handle_t tp, uint16_t *x, uint16_t *y, uint16_t *strength, uint8_t *point_num, uint8_t max_point_num)
{
portENTER_CRITICAL(&tp->data.lock);
/* Count of points */
*point_num = (tp->data.points > max_point_num ? max_point_num : tp->data.points);
for (size_t i = 0; i < *point_num; i++) {
x[i] = tp->data.coords[i].x;
y[i] = tp->data.coords[i].y;
if (strength) {
strength[i] = tp->data.coords[i].strength;
}
}
/* Invalidate */
tp->data.points = 0;
portEXIT_CRITICAL(&tp->data.lock);
return (*point_num > 0);
}
static esp_err_t del(esp_lcd_touch_handle_t tp)
{
/* Reset GPIO pin settings */
if (tp->config.int_gpio_num != GPIO_NUM_NC) {
gpio_reset_pin(tp->config.int_gpio_num);
if (tp->config.interrupt_callback) {
gpio_isr_handler_remove(tp->config.int_gpio_num);
}
}
if (tp->config.rst_gpio_num != GPIO_NUM_NC) {
gpio_reset_pin(tp->config.rst_gpio_num);
}
/* Release memory */
free(tp);
return ESP_OK;
}
static esp_err_t reset(esp_lcd_touch_handle_t tp)
{
if (tp->config.rst_gpio_num != GPIO_NUM_NC) {
ESP_RETURN_ON_ERROR(gpio_set_level(tp->config.rst_gpio_num, tp->config.levels.reset), TAG, "GPIO set level failed");
vTaskDelay(pdMS_TO_TICKS(200));
ESP_RETURN_ON_ERROR(gpio_set_level(tp->config.rst_gpio_num, !tp->config.levels.reset), TAG, "GPIO set level failed");
vTaskDelay(pdMS_TO_TICKS(200));
}
return ESP_OK;
}
#ifndef CONFIG_ESP_LCD_TOUCH_CST816S_DISABLE_READ_ID
static esp_err_t read_id(esp_lcd_touch_handle_t tp)
{
uint8_t id;
ESP_RETURN_ON_ERROR(i2c_read_bytes(tp, CHIP_ID_REG, &id, 1), TAG, "I2C read failed");
ESP_LOGI(TAG, "IC id: %d", id);
return ESP_OK;
}
#endif
static esp_err_t i2c_read_bytes(esp_lcd_touch_handle_t tp, uint16_t reg, uint8_t *data, uint8_t len)
{
ESP_RETURN_ON_FALSE(data, ESP_ERR_INVALID_ARG, TAG, "Invalid data");
return esp_lcd_panel_io_rx_param(tp->io, reg, data, len);
}

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dependencies:
esp_lcd_touch:
public: true
version: ^1.0.4
idf: '>=4.4.2'
description: ESP LCD Touch CST816S - touch controller CST816S
repository: git://github.com/espressif/esp-bsp.git
url: https://github.com/espressif/esp-bsp/tree/master/components/lcd_touch/esp_lcd_touch_cst816s
version: 1.1.0

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/*
* SPDX-FileCopyrightText: 2023-2025 Espressif Systems (Shanghai) CO LTD
*
* SPDX-License-Identifier: Apache-2.0
*/
/**
* @file
* @brief ESP LCD touch: CST816S
*/
#pragma once
#include "esp_idf_version.h"
#include "esp_lcd_touch.h"
#ifdef __cplusplus
extern "C" {
#endif
/**
* @brief Create a new CST816S touch driver
*
* @note The I2C communication should be initialized before use this function.
*
* @param io LCD panel IO handle, it should be created by `esp_lcd_new_panel_io_i2c()`
* @param config Touch panel configuration
* @param tp Touch panel handle
* @return
* - ESP_OK: on success
*/
esp_err_t esp_lcd_touch_new_i2c_cst816s(const esp_lcd_panel_io_handle_t io, const esp_lcd_touch_config_t *config, esp_lcd_touch_handle_t *tp);
/**
* @brief I2C address of the CST816S controller
*
*/
#define ESP_LCD_TOUCH_IO_I2C_CST816S_ADDRESS (0x15)
/**
* @brief Touch IO configuration structure
*
*/
#if ESP_IDF_VERSION < ESP_IDF_VERSION_VAL(5, 2, 0)
#define ESP_LCD_TOUCH_IO_I2C_CST816S_CONFIG() \
{ \
.dev_addr = ESP_LCD_TOUCH_IO_I2C_CST816S_ADDRESS, \
.on_color_trans_done = 0, \
.user_ctx = 0, \
.control_phase_bytes = 1, \
.dc_bit_offset = 0, \
.lcd_cmd_bits = 8, \
.lcd_param_bits = 0, \
.flags = \
{ \
.dc_low_on_data = 0, \
.disable_control_phase = 1, \
} \
}
#else
#define ESP_LCD_TOUCH_IO_I2C_CST816S_CONFIG() \
{ \
.dev_addr = ESP_LCD_TOUCH_IO_I2C_CST816S_ADDRESS, \
.on_color_trans_done = 0, \
.user_ctx = 0, \
.control_phase_bytes = 1, \
.dc_bit_offset = 0, \
.lcd_cmd_bits = 8, \
.lcd_param_bits = 0, \
.flags = \
{ \
.dc_low_on_data = 0, \
.disable_control_phase = 1, \
}, \
.scl_speed_hz = 100000 \
}
#endif
#ifdef __cplusplus
}
#endif

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distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.

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# The following lines of boilerplate have to be in your project's CMakeLists
# in this exact order for cmake to work correctly
cmake_minimum_required(VERSION 3.5)
set(EXTRA_COMPONENT_DIRS "$ENV{IDF_PATH}/tools/unit-test-app/components")
include($ENV{IDF_PATH}/tools/cmake/project.cmake)
project(test_esp_lcd_touch_cst816s)

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idf_component_register(SRCS "test_esp_lcd_touch_cst816s.c")

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## IDF Component Manager Manifest File
dependencies:
idf: ">=4.4"
esp_lcd_touch_cst816s:
version: "*"
override_path: "../../../esp_lcd_touch_cst816s"

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/*
* SPDX-FileCopyrightText: 2025 Espressif Systems (Shanghai) CO LTD
*
* SPDX-License-Identifier: CC0-1.0
*/
#include <inttypes.h>
#include "driver/i2c.h"
#include "driver/gpio.h"
#include "esp_log.h"
#include "unity.h"
#include "unity_test_runner.h"
#include "esp_lcd_touch_cst816s.h"
#define TEST_TOUCH_I2C_NUM (0)
#define TEST_TOUCH_I2C_CLK_HZ (400000)
#define TEST_LCD_H_RES (240)
#define TEST_LCD_V_RES (240)
/* LCD touch pins */
#define TEST_TOUCH_I2C_SCL (GPIO_NUM_18)
#define TEST_TOUCH_I2C_SDA (GPIO_NUM_8)
#define TEST_TOUCH_GPIO_INT (GPIO_NUM_3)
TEST_CASE("test cst816s to initialize touch", "[cst816s][i2c]")
{
/* Initilize I2C */
const i2c_config_t i2c_conf = {
.mode = I2C_MODE_MASTER,
.sda_io_num = TEST_TOUCH_I2C_SDA,
.sda_pullup_en = GPIO_PULLUP_DISABLE,
.scl_io_num = TEST_TOUCH_I2C_SCL,
.scl_pullup_en = GPIO_PULLUP_DISABLE,
.master.clk_speed = TEST_TOUCH_I2C_CLK_HZ
};
TEST_ESP_OK(i2c_param_config(TEST_TOUCH_I2C_NUM, &i2c_conf));
TEST_ESP_OK(i2c_driver_install(TEST_TOUCH_I2C_NUM, i2c_conf.mode, 0, 0, 0));
/* Initialize touch HW */
const esp_lcd_touch_config_t tp_cfg = {
.x_max = TEST_LCD_H_RES,
.y_max = TEST_LCD_V_RES,
.rst_gpio_num = GPIO_NUM_NC, // Shared with LCD reset
.int_gpio_num = TEST_TOUCH_GPIO_INT,
.levels = {
.reset = 0,
.interrupt = 0,
},
.flags = {
.swap_xy = 0,
.mirror_x = 1,
.mirror_y = 0,
},
};
esp_lcd_touch_handle_t touch_handle;
esp_lcd_panel_io_handle_t tp_io_handle = NULL;
const esp_lcd_panel_io_i2c_config_t tp_io_config = ESP_LCD_TOUCH_IO_I2C_CST816S_CONFIG();
TEST_ESP_OK(esp_lcd_new_panel_io_i2c((esp_lcd_i2c_bus_handle_t)TEST_TOUCH_I2C_NUM, &tp_io_config, &tp_io_handle));
TEST_ESP_OK(esp_lcd_touch_new_i2c_cst816s(tp_io_handle, &tp_cfg, &touch_handle));
}
void app_main(void)
{
printf("CST816S Test\r\n");
unity_run_menu();
}

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CONFIG_FREERTOS_HZ=1000
CONFIG_ESP_TASK_WDT_EN=n