From 260cf74e1b7fc57440c2271d293fba9ffffebebd Mon Sep 17 00:00:00 2001
From: cranial-smoke <cranial.smoke@gmail.com>
Date: Wed, 10 Feb 2021 17:50:51 -0500
Subject: [PATCH 1/2] Adds soft reset option to ST7789 driver

---
 lvgl_tft/Kconfig  | 13 +++++++++++++
 lvgl_tft/st7789.c |  7 +++++++
 2 files changed, 20 insertions(+)

diff --git a/lvgl_tft/Kconfig b/lvgl_tft/Kconfig
index f37adb9..c553e53 100644
--- a/lvgl_tft/Kconfig
+++ b/lvgl_tft/Kconfig
@@ -734,6 +734,19 @@ menu "LVGL TFT Display controller"
 
     endmenu
 
+    # menu will be visible only when LV_PREDEFINED_DISPLAY_NONE is y
+    menu "Display ST7789 Configuration"
+    visible if LV_TFT_DISPLAY_CONTROLLER_ST7789
+
+        config LV_DISP_ST7789_SOFT_RESET
+            bool "Soft reset - use software reset instead of reset pin"
+            depends on LV_TFT_DISPLAY_CONTROLLER_ST7789            
+            default n
+            help
+                Use software reset and ignores configured reset pin (some hardware does not use a reset pin).
+    
+    endmenu
+
     # menu will be visible only when LV_PREDEFINED_DISPLAY_NONE is y
     menu "Display Pin Assignments"
     visible if LV_PREDEFINED_DISPLAY_NONE || LV_PREDEFINED_DISPLAY_RPI_MPI3501 || LV_PREDEFINED_PINS_TKOALA
diff --git a/lvgl_tft/st7789.c b/lvgl_tft/st7789.c
index 206a622..b6fc086 100644
--- a/lvgl_tft/st7789.c
+++ b/lvgl_tft/st7789.c
@@ -84,8 +84,11 @@ void st7789_init(void)
     //Initialize non-SPI GPIOs
     gpio_pad_select_gpio(ST7789_DC);
     gpio_set_direction(ST7789_DC, GPIO_MODE_OUTPUT);
+
+#if !defined(CONFIG_LV_DISP_ST7789_SOFT_RESET)
     gpio_pad_select_gpio(ST7789_RST);
     gpio_set_direction(ST7789_RST, GPIO_MODE_OUTPUT);
+#endif
     
 #if ST7789_ENABLE_BACKLIGHT_CONTROL
     gpio_pad_select_gpio(ST7789_BCKL);
@@ -93,10 +96,14 @@ void st7789_init(void)
 #endif
 
     //Reset the display
+#if !defined(CONFIG_LV_DISP_ST7789_SOFT_RESET)
     gpio_set_level(ST7789_RST, 0);
     vTaskDelay(100 / portTICK_RATE_MS);
     gpio_set_level(ST7789_RST, 1);
     vTaskDelay(100 / portTICK_RATE_MS);
+#else
+    st7789_send_cmd(ST7789_SWRESET);
+#endif
 
     printf("ST7789 initialization.\n");
 

From 3a34055cad1bee9183fa9202e299a9e5c7a9842f Mon Sep 17 00:00:00 2001
From: cranial-smoke <cranial.smoke@gmail.com>
Date: Thu, 11 Feb 2021 10:11:48 -0500
Subject: [PATCH 2/2] Hides reset pin config if ST7789 soft reset is enabled

---
 lvgl_tft/Kconfig | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lvgl_tft/Kconfig b/lvgl_tft/Kconfig
index c553e53..c3efd5e 100644
--- a/lvgl_tft/Kconfig
+++ b/lvgl_tft/Kconfig
@@ -897,7 +897,7 @@ menu "LVGL TFT Display controller"
                 Configure the display DC pin here.
 
         config LV_DISP_PIN_RST
-            int "GPIO for Reset" if LV_TFT_DISPLAY_PROTOCOL_SPI
+            int "GPIO for Reset" if LV_TFT_DISPLAY_PROTOCOL_SPI && !LV_DISP_ST7789_SOFT_RESET
             range 0 39 if IDF_TARGET_ESP32
             range 0 43 if IDF_TARGET_ESP32S2