Indev: Add support for GT911 touch driver by @dastarling

CMakeLists.txt

@@ -70,6 +70,8 @@ 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_touch/Kconfig

@@ -9,6 +9,7 @@ menu "LVGL Touch controller"
         default 4 if LV_TOUCH_CONTROLLER_ADCRAW
         default 5 if LV_TOUCH_CONTROLLER_FT81X
         default 6 if LV_TOUCH_CONTROLLER_RA8875
+        default 7 if LV_TOUCH_CONTROLLER_GT911
 
     choice
 	prompt "Select a touch panel controller model."
@@ -36,6 +37,9 @@ 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
@@ -499,4 +503,49 @@ menu "LVGL Touch controller"
 
     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/touch_driver.c

@@ -21,6 +21,8 @@ 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
 }
 
@@ -40,6 +42,8 @@ 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
 
     return res;

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
 
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