Merge branch 'master' into master

CMakeLists.txt

@@ -75,6 +75,8 @@ if(CONFIG_LV_TOUCH_CONTROLLER)
         list(APPEND SOURCES "lvgl_touch/FT81x.c")
     elseif(CONFIG_LV_TOUCH_CONTROLLER_RA8875)
         list(APPEND SOURCES "lvgl_touch/ra8875_touch.c")
+    elseif(CONFIG_LV_TOUCH_CONTROLLER_GT911)
+        list(APPEND SOURCES "lvgl_touch/gt911.c")
     endif()
 
     if(CONFIG_LV_TOUCH_DRIVER_PROTOCOL_SPI)

lvgl_helpers.c

@@ -19,9 +19,9 @@
 #include "driver/i2c.h"
 
 #ifdef LV_LVGL_H_INCLUDE_SIMPLE
-#include "src/lv_core/lv_refr.h"
+#include "lvgl.h"
 #else
-#include "lvgl/src/lv_core/lv_refr.h"
+#include "lvgl/lvgl.h"
 #endif
 
 /*********************
@@ -53,7 +53,12 @@
 /* Interface and driver initialization */
 void lvgl_driver_init(void)
 {
+    /* Since LVGL v8 LV_HOR_RES_MAX and LV_VER_RES_MAX are not defined, so
+     * print it only if they are defined. */
+#if (LVGL_VERSION_MAJOR < 8)
     ESP_LOGI(TAG, "Display hor size: %d, ver size: %d", LV_HOR_RES_MAX, LV_VER_RES_MAX);
+#endif
+
     ESP_LOGI(TAG, "Display buffer size: %d", DISP_BUF_SIZE);
 
 #if defined (CONFIG_LV_TFT_DISPLAY_CONTROLLER_FT81X)
@@ -202,23 +207,45 @@ bool lvgl_i2c_driver_init(int port, int sda_pin, int scl_pin, int speed_hz)
     return ESP_OK != err;
 }
 
-/* Initialize spi bus master */
+/* Initialize spi bus master
+ *
+ * NOTE: dma_chan type and value changed to int instead of spi_dma_chan_t
+ * for backwards compatibility with ESP-IDF versions prior v4.3.
+ *
+ * We could use the ESP_IDF_VERSION_VAL macro available in the "esp_idf_version.h"
+ * header available since ESP-IDF v4.
+ */
 bool lvgl_spi_driver_init(int host,
     int miso_pin, int mosi_pin, int sclk_pin,
     int max_transfer_sz,
     int dma_channel,
     int quadwp_pin, int quadhd_pin)
 {
+    int dma_chan = 0 /* SPI_DMA_DISABLED */;
+
 #if defined (CONFIG_IDF_TARGET_ESP32)
     assert((SPI_HOST <= host) && (VSPI_HOST >= host));
     const char *spi_names[] = {
         "SPI_HOST", "HSPI_HOST", "VSPI_HOST"
     };
+
+    dma_chan = dma_channel;
 #elif defined (CONFIG_IDF_TARGET_ESP32S2)
     assert((SPI_HOST <= host) && (HSPI_HOST >= host));
     const char *spi_names[] = {
         "SPI_HOST", "", ""
     };
+
+    dma_chan = dma_channel;
+#elif defined (CONFIG_IDF_TARGET_ESP32C3)
+    assert((SPI1_HOST <= host) && (SPI3_HOST >= host));
+    const char *spi_names[] = {
+        "SPI1_HOST", "SPI2_HOST", "SPI3_HOST"
+    };
+
+    dma_chan = 3 /* SPI_DMA_CH_AUTO */;
+#else
+#error "Target chip not selected"
 #endif
 
     ESP_LOGI(TAG, "Configuring SPI host %s (%d)", spi_names[host], host);
@@ -237,7 +264,7 @@ bool lvgl_spi_driver_init(int host,
     };
 
     ESP_LOGI(TAG, "Initializing SPI bus...");
-    esp_err_t ret = spi_bus_initialize(host, &buscfg, dma_channel);
+    esp_err_t ret = spi_bus_initialize(host, &buscfg, dma_chan);
     assert(ret == ESP_OK);
 
     return ESP_OK != ret;

lvgl_spi_conf.h

@@ -65,11 +65,15 @@ extern "C" {
 #define ENABLE_TOUCH_INPUT  CONFIG_LV_ENABLE_TOUCH
 
 #if defined (CONFIG_LV_TFT_DISPLAY_SPI_HSPI)
-#define TFT_SPI_HOST HSPI_HOST
+#if defined (CONFIG_IDF_TARGET_ESP32C3)
+#define TFT_SPI_HOST    SPI2_HOST
+#else
+#define TFT_SPI_HOST    HSPI_HOST
+#endif
 #elif defined (CONFIG_LV_TFT_DISPLAY_SPI_VSPI)
-#define TFT_SPI_HOST VSPI_HOST
+#define TFT_SPI_HOST    VSPI_HOST
 #elif defined (CONFIG_LV_TFT_DISPLAY_SPI_FSPI)
-#define TFT_SPI_HOST FSPI_HOST
+#define TFT_SPI_HOST    FSPI_HOST
 #endif
 
 #if defined (CONFIG_LV_TFT_DISPLAY_SPI_HALF_DUPLEX)

lvgl_tft/Kconfig

@@ -785,6 +785,7 @@ menu "LVGL TFT/Epaper Display controller"
             int "GPIO for MOSI (Master Out Slave In)" if LV_TFT_DISPLAY_PROTOCOL_SPI
             range 0 39 if IDF_TARGET_ESP32
             range 0 43 if IDF_TARGET_ESP32S2
+            range 0 21 if IDF_TARGET_ESP32C3
 
             default 23 if LV_PREDEFINED_DISPLAY_WROVER4
             default 23 if LV_PREDEFINED_DISPLAY_ATAG
@@ -814,6 +815,7 @@ menu "LVGL TFT/Epaper Display controller"
             depends on LV_DISPLAY_USE_SPI_MISO
             range 0 39 if IDF_TARGET_ESP32
             range 0 43 if IDF_TARGET_ESP32S2
+            range 0 21 if IDF_TARGET_ESP32C3
 
             default 19 if LV_PREDEFINED_PINS_TKOALA
             default 38 if LV_PREDEFINED_DISPLAY_M5CORE2
@@ -836,6 +838,7 @@ menu "LVGL TFT/Epaper Display controller"
             depends on LV_TFT_DISPLAY_SPI_TRANS_MODE_QIO
             range -1 39 if IDF_TARGET_ESP32
             range -1 43 if IDF_TARGET_ESP32S2
+            range 0 21 if IDF_TARGET_ESP32C3
 
             default 22 if LV_PREDEFINED_PINS_TKOALA && LV_TFT_DISPLAY_SPI_TRANS_MODE_QIO
             default -1
@@ -847,6 +850,7 @@ menu "LVGL TFT/Epaper Display controller"
             depends on LV_TFT_DISPLAY_SPI_TRANS_MODE_QIO
             range -1 39 if IDF_TARGET_ESP32
             range -1 43 if IDF_TARGET_ESP32S2
+            range 0 21 if IDF_TARGET_ESP32C3
 
             default 21 if LV_PREDEFINED_PINS_TKOALA && LV_TFT_DISPLAY_SPI_TRANS_MODE_QIO
             default -1
@@ -857,6 +861,7 @@ menu "LVGL TFT/Epaper Display controller"
             int "GPIO for CLK (SCK / Serial Clock)" if LV_TFT_DISPLAY_PROTOCOL_SPI
             range 0 39 if IDF_TARGET_ESP32
             range 0 43 if IDF_TARGET_ESP32S2
+            range 0 21 if IDF_TARGET_ESP32C3
 
             default 18 if LV_PREDEFINED_DISPLAY_M5STACK || LV_PREDEFINED_DISPLAY_M5STICK
             default 18 if LV_PREDEFINED_DISPLAY_M5CORE2
@@ -885,6 +890,7 @@ menu "LVGL TFT/Epaper Display controller"
             depends on LV_DISPLAY_USE_SPI_CS
             range 0 39 if IDF_TARGET_ESP32
             range 0 43 if IDF_TARGET_ESP32S2
+            range 0 21 if IDF_TARGET_ESP32C3
 
             default 5 if LV_PREDEFINED_PINS_38V1
             default 14 if LV_PREDEFINED_DISPLAY_M5STACK || LV_PREDEFINED_DISPLAY_M5STICK
@@ -913,6 +919,7 @@ menu "LVGL TFT/Epaper Display controller"
             int "GPIO for DC (Data / Command)" if LV_TFT_DISPLAY_PROTOCOL_SPI
             range 0 39 if IDF_TARGET_ESP32
             range 0 43 if IDF_TARGET_ESP32S2
+            range 0 21 if IDF_TARGET_ESP32C3
 
             depends on LV_DISPLAY_USE_DC
             default 19 if LV_PREDEFINED_PINS_38V1
@@ -950,6 +957,7 @@ menu "LVGL TFT/Epaper Display controller"
             depends on LV_DISP_USE_RST
             range 0 39 if IDF_TARGET_ESP32
             range 0 43 if IDF_TARGET_ESP32S2
+            range 0 21 if IDF_TARGET_ESP32C3
 
             default 18 if LV_PREDEFINED_PINS_38V1
             default 25 if LV_PREDEFINED_PINS_38V4
@@ -971,9 +979,11 @@ menu "LVGL TFT/Epaper Display controller"
             int "GPIO for Busy" if LV_TFT_DISPLAY_CONTROLLER_IL3820 || LV_TFT_DISPLAY_CONTROLLER_JD79653A || LV_TFT_DISPLAY_CONTROLLER_UC8151D
             range 0 39 if IDF_TARGET_ESP32
             range 0 43 if IDF_TARGET_ESP32S2
+            range 0 21 if IDF_TARGET_ESP32C3
 
             default 35 if LV_TFT_DISPLAY_CONTROLLER_IL3820 || LV_TFT_DISPLAY_CONTROLLER_JD79653A || LV_TFT_DISPLAY_CONTROLLER_UC8151D
-            default 35
+            default 35 if IDF_TARGET_ESP32 || IDF_TARGET_ESP32S2
+            default 21 if IDF_TARGET_ESP32C3
 
             help
                 Configure the display Busy pin here.
@@ -1010,6 +1020,7 @@ menu "LVGL TFT/Epaper Display controller"
             depends on LV_ENABLE_BACKLIGHT_CONTROL
             range 0 39 if IDF_TARGET_ESP32
             range 0 43 if IDF_TARGET_ESP32S2
+            range 0 21 if IDF_TARGET_ESP32C3
 
             default 23 if LV_PREDEFINED_PINS_38V1
             default 26 if LV_PREDEFINED_PINS_38V4
@@ -1030,6 +1041,7 @@ menu "LVGL TFT/Epaper Display controller"
             int "GPIO for I2C SDA" if LV_TFT_DISPLAY_PROTOCOL_I2C
             range 0 39 if IDF_TARGET_ESP32
             range 0 43 if IDF_TARGET_ESP32S2
+            range 0 21 if IDF_TARGET_ESP32C3
 
             default 5 if LV_PREDEFINED_DISPLAY_WEMOS_LOLIN
             default 5
@@ -1041,6 +1053,7 @@ menu "LVGL TFT/Epaper Display controller"
             int "GPIO for I2C SCL" if LV_TFT_DISPLAY_PROTOCOL_I2C
             range 0 39 if IDF_TARGET_ESP32
             range 0 43 if IDF_TARGET_ESP32S2
+            range 0 21 if IDF_TARGET_ESP32C3
 
             default 4 if LV_PREDEFINED_DISPLAY_WEMOS_LOLIN
             default 4

lvgl_touch/Kconfig

@@ -6,10 +6,11 @@ menu "LVGL Touch controller"
 	default 1 if LV_TOUCH_CONTROLLER_XPT2046
 	default 2 if LV_TOUCH_CONTROLLER_FT6X06
 	default 3 if LV_TOUCH_CONTROLLER_STMPE610
-        default 4 if LV_TOUCH_CONTROLLER_ADCRAW
+  default 4 if LV_TOUCH_CONTROLLER_ADCRAW
-        default 5 if LV_TOUCH_CONTROLLER_FT81X
+  default 5 if LV_TOUCH_CONTROLLER_FT81X
-        default 6 if LV_TOUCH_CONTROLLER_RA8875
+  default 6 if LV_TOUCH_CONTROLLER_RA8875
-        default 7 if LV_TOUCH_CONTROLLER_L58
+  default 7 if LV_TOUCH_CONTROLLER_GT911
+  default 8 if LV_TOUCH_CONTROLLER_L58
     choice
 	prompt "Select a touch panel controller model."
 	default LV_TOUCH_CONTROLLER_NONE
@@ -42,6 +43,9 @@ menu "LVGL Touch controller"
         config LV_TOUCH_CONTROLLER_RA8875
             select LV_TOUCH_DRIVER_DISPLAY
             bool "RA8875"
+        config LV_TOUCH_CONTROLLER_GT911
+            select LV_TOUCH_DRIVER_PROTOCOL_I2C
+            bool "GT911"
     endchoice
     
     config LV_TOUCH_DRIVER_PROTOCOL_SPI
@@ -135,6 +139,7 @@ menu "LVGL Touch controller"
             prompt "GPIO for MISO (Master In Slave Out)"
             range 0 39 if IDF_TARGET_ESP32
             range 0 43 if IDF_TARGET_ESP32S2
+            range 0 21 if IDF_TARGET_ESP32C3
             
             default 35 if LV_PREDEFINED_PINS_38V1
             default 19
@@ -146,6 +151,7 @@ menu "LVGL Touch controller"
             prompt "GPIO for MOSI (Master Out Slave In)"
             range 0 39 if IDF_TARGET_ESP32
             range 0 43 if IDF_TARGET_ESP32S2
+            range 0 21 if IDF_TARGET_ESP32C3
 
             default 32 if LV_PREDEFINED_PINS_38V1
             default 23
@@ -156,6 +162,7 @@ menu "LVGL Touch controller"
             int "GPIO for CLK (SCK / Serial Clock)"
             range 0 39 if IDF_TARGET_ESP32
             range 0 43 if IDF_TARGET_ESP32S2
+            range 0 21 if IDF_TARGET_ESP32C3
             
             default 26 if LV_PREDEFINED_PINS_38V1
             default 18
@@ -176,6 +183,7 @@ menu "LVGL Touch controller"
             int "GPIO for IRQ (Interrupt Request)"
             range 0 39 if IDF_TARGET_ESP32
             range 0 43 if IDF_TARGET_ESP32S2
+            range 0 21 if IDF_TARGET_ESP32C3
 	    
             default 27 if LV_PREDEFINED_PINS_38V4
             default 25
@@ -248,6 +256,7 @@ menu "LVGL Touch controller"
             prompt "GPIO for SDA (I2C)"
             range 0 39 if IDF_TARGET_ESP32
             range 0 43 if IDF_TARGET_ESP32S2
+            range 0 21 if IDF_TARGET_ESP32C3
 
             default 21
             help
@@ -257,6 +266,7 @@ menu "LVGL Touch controller"
             int "GPIO for clock signal SCL (I2C)"
             range 0 39 if IDF_TARGET_ESP32
             range 0 43 if IDF_TARGET_ESP32S2
+            range 0 21 if IDF_TARGET_ESP32C3
             
             default 22
             help
@@ -291,6 +301,7 @@ menu "LVGL Touch controller"
             prompt "GPIO for MISO (Master In Slave Out)"
             range 0 39 if IDF_TARGET_ESP32
             range 0 43 if IDF_TARGET_ESP32S2
+            range 0 21 if IDF_TARGET_ESP32C3
             
             default 35 if LV_PREDEFINED_PINS_38V1
             default 19 if LV_PREDEFINED_DISPLAY_ADA_FEATHERWING
@@ -300,10 +311,12 @@ menu "LVGL Touch controller"
             Configure the touchpanel MISO pin here.
 
         config LV_TOUCH_SPI_MOSI
+            # TODO Fix default for ESP32C3
             int
             prompt "GPIO for MOSI (Master Out Slave In)"
             range 0 39 if IDF_TARGET_ESP32
             range 0 43 if IDF_TARGET_ESP32S2
+            range 0 21 if IDF_TARGET_ESP32C3
 
             default 32 if LV_PREDEFINED_PINS_38V1
             default 18 if LV_PREDEFINED_DISPLAY_ADA_FEATHERWING
@@ -316,6 +329,7 @@ menu "LVGL Touch controller"
             int "GPIO for CLK (SCK / Serial Clock)"
             range 0 39 if IDF_TARGET_ESP32
             range 0 43 if IDF_TARGET_ESP32S2
+            range 0 21 if IDF_TARGET_ESP32C3
 
             default 26 if LV_PREDEFINED_PINS_38V1
             default 5 if LV_PREDEFINED_DISPLAY_ADA_FEATHERWING
@@ -327,6 +341,7 @@ menu "LVGL Touch controller"
             int "GPIO for CS (Slave Select)"
             range 0 39 if IDF_TARGET_ESP32
             range 0 43 if IDF_TARGET_ESP32S2
+            range 0 21 if IDF_TARGET_ESP32C3
             
             default 33 if LV_PREDEFINED_PINS_38V1
             default 32 if LV_PREDEFINED_DISPLAY_ADA_FEATHERWING
@@ -524,5 +539,50 @@ menu "LVGL Touch controller"
             default y
 
     endmenu
+    
+    menu "Touchpanel (GT911) Pin Assignments"
+        depends on LV_TOUCH_CONTROLLER_GT911
+
+        config LV_TOUCH_I2C_SDA
+            int
+            prompt "GPIO for SDA (I2C)"
+            range 0 39 if IDF_TARGET_ESP32
+            range 0 43 if IDF_TARGET_ESP32S2
+            range 0 21 if IDF_TARGET_ESP32C3
+
+            default 2
+            help
+            Configure the I2C touchpanel SDA pin here.
+
+        config LV_TOUCH_I2C_SCL
+            int "GPIO for clock signal SCL (I2C)"
+            range 0 39 if IDF_TARGET_ESP32
+            range 0 43 if IDF_TARGET_ESP32S2
+            range 0 21 if IDF_TARGET_ESP32C3
+            
+            default 3
+            help
+            Configure the I2C touchpanel SCL pin here.
+    endmenu
+
+    menu "Touchpanel Configuration (GT911)"
+        depends on LV_TOUCH_CONTROLLER_GT911
+
+	config LV_GT911_SWAPXY
+	    bool
+	    prompt "Swap X with Y coordinate."
+	    default y
+
+        config LV_GT911_INVERT_X
+            bool
+            prompt "Invert X coordinate value."
+            default n
+
+        config LV_GT911_INVERT_Y
+            bool
+            prompt "Invert Y coordinate value."
+            default y
+
+    endmenu
 
 endmenu

lvgl_touch/gt911.c

@@ -0,0 +1,168 @@
+/*
+* Copyright © 2021 Sturnus Inc.
+
+* Permission is hereby granted, free of charge, to any person obtaining a copy of this 
+* software and associated documentation files (the “Software”), to deal in the Software 
+* without restriction, including without limitation the rights to use, copy, modify, merge, 
+* publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons 
+* to whom the Software is furnished to do so, subject to the following conditions:
+*
+* The above copyright notice and this permission notice shall be included in all copies or 
+* substantial portions of the Software.
+* 
+* THE SOFTWARE IS PROVIDED “AS IS”, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, 
+* INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR 
+* PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE 
+* FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, 
+* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE 
+* SOFTWARE.
+*/
+
+#include <esp_log.h>
+#include <driver/i2c.h>
+#ifdef LV_LVGL_H_INCLUDE_SIMPLE
+#include <lvgl.h>
+#else
+#include <lvgl/lvgl.h>
+#endif
+#include "gt911.h"
+#include "tp_i2c.h"
+#include "../lvgl_i2c_conf.h"
+
+#define TAG "GT911"
+
+gt911_status_t gt911_status;
+
+//TODO: handle multibyte read and refactor to just one read transaction
+esp_err_t gt911_i2c_read(uint8_t slave_addr, uint16_t register_addr, uint8_t *data_buf, uint8_t len) {
+    i2c_cmd_handle_t i2c_cmd = i2c_cmd_link_create();
+
+    i2c_master_start(i2c_cmd);
+    i2c_master_write_byte(i2c_cmd, (slave_addr << 1) | I2C_MASTER_WRITE, true);
+    i2c_master_write_byte(i2c_cmd, (register_addr >> 8), I2C_MASTER_ACK);
+    i2c_master_write_byte(i2c_cmd, (register_addr & 0xFF), I2C_MASTER_ACK);
+
+    i2c_master_start(i2c_cmd);
+    i2c_master_write_byte(i2c_cmd, (slave_addr << 1) | I2C_MASTER_READ, true);
+
+    i2c_master_read_byte(i2c_cmd, data_buf, I2C_MASTER_NACK);
+    i2c_master_stop(i2c_cmd);
+    esp_err_t ret = i2c_master_cmd_begin(TOUCH_I2C_PORT, i2c_cmd, 1000 / portTICK_RATE_MS);
+    i2c_cmd_link_delete(i2c_cmd);
+    return ret;
+}
+
+esp_err_t gt911_i2c_write8(uint8_t slave_addr, uint16_t register_addr, uint8_t data) {
+    i2c_cmd_handle_t i2c_cmd = i2c_cmd_link_create();
+
+    i2c_master_start(i2c_cmd);
+    i2c_master_write_byte(i2c_cmd, (slave_addr << 1) | I2C_MASTER_WRITE, true);
+    i2c_master_write_byte(i2c_cmd, (register_addr >> 8), I2C_MASTER_ACK);
+    i2c_master_write_byte(i2c_cmd, (register_addr & 0xFF), I2C_MASTER_ACK);
+    i2c_master_write_byte(i2c_cmd, data, I2C_MASTER_ACK);
+    i2c_master_stop(i2c_cmd);
+    esp_err_t ret = i2c_master_cmd_begin(TOUCH_I2C_PORT, i2c_cmd, 1000 / portTICK_RATE_MS);
+    i2c_cmd_link_delete(i2c_cmd);
+    return ret;
+}
+
+/**
+  * @brief  Initialize for GT911 communication via I2C
+  * @param  dev_addr: Device address on communication Bus (I2C slave address of GT911).
+  * @retval None
+  */
+void gt911_init(uint8_t dev_addr) {
+    if (!gt911_status.inited) {
+        gt911_status.i2c_dev_addr = dev_addr;
+        uint8_t data_buf;
+        esp_err_t ret;
+
+        ESP_LOGI(TAG, "Checking for GT911 Touch Controller");
+        if ((ret = gt911_i2c_read(dev_addr, GT911_PRODUCT_ID1, &data_buf, 1) != ESP_OK)) {
+            ESP_LOGE(TAG, "Error reading from device: %s",
+                        esp_err_to_name(ret));    // Only show error the first time
+            return;
+        }
+
+        // Read 4 bytes for Product ID in ASCII
+        for (int i = 0; i < GT911_PRODUCT_ID_LEN; i++) {
+            gt911_i2c_read(dev_addr, (GT911_PRODUCT_ID1 + i), (uint8_t *)&(gt911_status.product_id[i]), 1);
+        }
+        ESP_LOGI(TAG, "\tProduct ID: %s", gt911_status.product_id);
+
+        gt911_i2c_read(dev_addr, GT911_VENDOR_ID, &data_buf, 1);
+        ESP_LOGI(TAG, "\tVendor ID: 0x%02x", data_buf);
+
+        gt911_i2c_read(dev_addr, GT911_X_COORD_RES_L, &data_buf, 1);
+        gt911_status.max_x_coord = data_buf;
+        gt911_i2c_read(dev_addr, GT911_X_COORD_RES_H, &data_buf, 1);
+        gt911_status.max_x_coord |= ((uint16_t)data_buf << 8);
+        ESP_LOGI(TAG, "\tX Resolution: %d", gt911_status.max_x_coord);
+
+        gt911_i2c_read(dev_addr, GT911_Y_COORD_RES_L, &data_buf, 1);
+        gt911_status.max_y_coord = data_buf;
+        gt911_i2c_read(dev_addr, GT911_Y_COORD_RES_H, &data_buf, 1);
+        gt911_status.max_y_coord |= ((uint16_t)data_buf << 8);
+        ESP_LOGI(TAG, "\tY Resolution: %d", gt911_status.max_y_coord);
+        gt911_status.inited = true;
+    }
+}
+
+/**
+  * @brief  Get the touch screen X and Y positions values. Ignores multi touch
+  * @param  drv:
+  * @param  data: Store data here
+  * @retval Always false
+  */
+bool gt911_read(lv_indev_drv_t *drv, lv_indev_data_t *data) {
+    uint8_t touch_pnt_cnt;        // Number of detected touch points
+    static int16_t last_x = 0;  // 12bit pixel value
+    static int16_t last_y = 0;  // 12bit pixel value
+    uint8_t data_buf;
+    uint8_t status_reg;
+
+    gt911_i2c_read(gt911_status.i2c_dev_addr, GT911_STATUS_REG, &status_reg, 1);
+//    ESP_LOGI(TAG, "\tstatus: 0x%02x", status_reg);
+    touch_pnt_cnt = status_reg & 0x0F;
+    if ((status_reg & 0x80) || (touch_pnt_cnt < 6)) {
+        //Reset Status Reg Value
+        gt911_i2c_write8(gt911_status.i2c_dev_addr, GT911_STATUS_REG, 0x00);
+    }
+    if (touch_pnt_cnt != 1) {    // ignore no touch & multi touch
+        data->point.x = last_x;
+        data->point.y = last_y;
+        data->state = LV_INDEV_STATE_REL;
+        return false;
+    }
+
+//    gt911_i2c_read(gt911_status.i2c_dev_addr, GT911_TRACK_ID1, &data_buf, 1);
+//    ESP_LOGI(TAG, "\ttrack_id: %d", data_buf);
+
+    gt911_i2c_read(gt911_status.i2c_dev_addr, GT911_PT1_X_COORD_L, &data_buf, 1);
+    last_x = data_buf;
+    gt911_i2c_read(gt911_status.i2c_dev_addr, GT911_PT1_X_COORD_H, &data_buf, 1);
+    last_x |= ((uint16_t)data_buf << 8);
+
+    gt911_i2c_read(gt911_status.i2c_dev_addr, GT911_PT1_Y_COORD_L, &data_buf, 1);
+    last_y = data_buf;
+    gt911_i2c_read(gt911_status.i2c_dev_addr, GT911_PT1_Y_COORD_H, &data_buf, 1);
+    last_y |= ((uint16_t)data_buf << 8);
+
+#if CONFIG_LV_GT911_INVERT_X
+    last_x = gt911_status.max_x_coord - last_x;
+#endif
+#if CONFIG_LV_GT911_INVERT_Y
+    last_y = gt911_status.max_y_coord - last_y;
+#endif
+#if CONFIG_LV_GT911_SWAPXY
+    int16_t swap_buf = last_x;
+    last_x = last_y;
+    last_y = swap_buf;
+#endif
+    data->point.x = last_x;
+    data->point.y = last_y;
+    data->state = LV_INDEV_STATE_PR;
+    ESP_LOGI(TAG, "X=%u Y=%u", data->point.x, data->point.y);
+    ESP_LOGV(TAG, "X=%u Y=%u", data->point.x, data->point.y);
+    return false;
+}

lvgl_touch/gt911.h

@@ -0,0 +1,94 @@
+#ifndef __GT911_H
+/*
+* Copyright © 2021 Sturnus Inc.
+
+* Permission is hereby granted, free of charge, to any person obtaining a copy of this 
+* software and associated documentation files (the “Software”), to deal in the Software 
+* without restriction, including without limitation the rights to use, copy, modify, merge, 
+* publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons 
+* to whom the Software is furnished to do so, subject to the following conditions:
+*
+* The above copyright notice and this permission notice shall be included in all copies or 
+* substantial portions of the Software.
+* 
+* THE SOFTWARE IS PROVIDED “AS IS”, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, 
+* INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR 
+* PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE 
+* FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, 
+* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE 
+* SOFTWARE.
+*/
+
+#define __GT911_H
+
+#include <stdint.h>
+#include <stdbool.h>
+#ifdef LV_LVGL_H_INCLUDE_SIMPLE
+#include "lvgl.h"
+#else
+#include "lvgl/lvgl.h"
+#endif
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#define GT911_I2C_SLAVE_ADDR   0x5D
+
+#define GT911_PRODUCT_ID_LEN   4
+
+/* Register Map of GT911 */
+#define GT911_PRODUCT_ID1             0x8140
+#define GT911_PRODUCT_ID2             0x8141
+#define GT911_PRODUCT_ID3             0x8142
+#define GT911_PRODUCT_ID4             0x8143
+#define GT911_FIRMWARE_VER_L          0x8144
+#define GT911_FIRMWARE_VER_H          0x8145
+#define GT911_X_COORD_RES_L           0x8146
+#define GT911_X_COORD_RES_H           0x8147
+#define GT911_Y_COORD_RES_L           0x8148
+#define GT911_Y_COORD_RES_H           0x8149
+#define GT911_VENDOR_ID               0x814A
+
+#define GT911_STATUS_REG              0x814E
+#define   GT911_STATUS_REG_BUF        0x80
+#define   GT911_STATUS_REG_LARGE      0x40
+#define   GT911_STATUS_REG_PROX_VALID 0x20
+#define   GT911_STATUS_REG_HAVEKEY    0x10
+#define   GT911_STATUS_REG_PT_MASK    0x0F
+
+#define GT911_TRACK_ID1               0x814F
+#define GT911_PT1_X_COORD_L           0x8150
+#define GT911_PT1_X_COORD_H           0x8151
+#define GT911_PT1_Y_COORD_L           0x8152
+#define GT911_PT1_Y_COORD_H           0x8153
+#define GT911_PT1_X_SIZE_L            0x8154
+#define GT911_PT1_X_SIZE_H            0x8155
+
+typedef struct {
+    bool inited;
+    char product_id[GT911_PRODUCT_ID_LEN];
+    uint16_t max_x_coord;
+    uint16_t max_y_coord;
+    uint8_t i2c_dev_addr;
+} gt911_status_t;
+
+/**
+  * @brief  Initialize for GT911 communication via I2C
+  * @param  dev_addr: Device address on communication Bus (I2C slave address of GT911).
+  * @retval None
+  */
+void gt911_init(uint8_t dev_addr);
+
+/**
+  * @brief  Get the touch screen X and Y positions values. Ignores multi touch
+  * @param  drv:
+  * @param  data: Store data here
+  * @retval Always false
+  */
+bool gt911_read(lv_indev_drv_t *drv, lv_indev_data_t *data);
+
+#ifdef __cplusplus
+}
+#endif
+#endif /* __GT911_H */

lvgl_touch/touch_driver.c

@@ -24,10 +24,16 @@ void touch_driver_init(void)
     /* nothing to do */
 #elif defined (CONFIG_LV_TOUCH_CONTROLLER_RA8875)
     ra8875_touch_init();
+#elif defined (CONFIG_LV_TOUCH_CONTROLLER_GT911)
+    gt911_init(GT911_I2C_SLAVE_ADDR);
 #endif
 }
 
+#if LVGL_VERSION_MAJOR >= 8
+void touch_driver_read(lv_indev_drv_t *drv, lv_indev_data_t *data)
+#else
 bool touch_driver_read(lv_indev_drv_t *drv, lv_indev_data_t *data)
+#endif
 {
     bool res = false;
 
@@ -46,8 +52,14 @@ bool touch_driver_read(lv_indev_drv_t *drv, lv_indev_data_t *data)
     res = FT81x_read(drv, data);
 #elif defined (CONFIG_LV_TOUCH_CONTROLLER_RA8875)
     res = ra8875_touch_read(drv, data);
+#elif defined (CONFIG_LV_TOUCH_CONTROLLER_GT911)
+    res = gt911_read(drv, data);
 #endif
 
+#if LVGL_VERSION_MAJOR >= 8
+    data->continue_reading = res;
+#else
     return res;
+#endif
 }
 

lvgl_touch/touch_driver.h

@@ -32,6 +32,8 @@ extern "C" {
 #include "FT81x.h"
 #elif defined (CONFIG_LV_TOUCH_CONTROLLER_RA8875)
 #include "ra8875_touch.h"
+#elif defined (CONFIG_LV_TOUCH_CONTROLLER_GT911)
+#include "gt911.h"
 #endif
 
 /*********************
@@ -42,7 +44,12 @@ extern "C" {
  * GLOBAL PROTOTYPES
  **********************/
 void touch_driver_init(void);
+
+#if LVGL_VERSION_MAJOR >= 8
+void touch_driver_read(lv_indev_drv_t *drv, lv_indev_data_t *data);
+#else
 bool touch_driver_read(lv_indev_drv_t *drv, lv_indev_data_t *data);
+#endif
 
 #ifdef __cplusplus
 } /* extern "C" */