From 1a98394c13668eefefb5adcbf53badbef5615fd1 Mon Sep 17 00:00:00 2001
From: Rene Zeldenthuis <rzeldent@gmail.com>
Date: Mon, 20 Nov 2023 20:03:04 +0100
Subject: [PATCH] Updated documentation

---
 README.md                                     |  49 +++++++++++-------
 .../images/Squareline-display-properties.png  | Bin 0 -> 13793 bytes
 src/smartdisplay_cst816s.c                    |   4 +-
 src/smartdisplay_gt911.c                      |   4 +-
 src/smartdisplay_xpt2046.c                    |   2 +
 5 files changed, 36 insertions(+), 23 deletions(-)
 create mode 100644 assets/images/Squareline-display-properties.png

diff --git a/README.md b/README.md
index ccaec5a..d16640b 100644
--- a/README.md
+++ b/README.md
@@ -10,12 +10,12 @@ This library supports these boards without any effort.
 
 With the boards, there is a link supplied and there are a lot of examples present and this looks fine.
 These examples for [LVGL](https://lvgl.io/) depend on external libraries ([TFT_eSPI](https://github.com/Bodmer/TFT_eSPI) or [LovyanGFX](https://github.com/lovyan03/LovyanGFX)).
-However, when implementing the capacitive version, I found out that these libraries had their flaws using these boards:
+However, when working with these libraries, I found out that these libraries had their flaws using these boards:
 
+- A lot of configuring to do before it all works
 - A lot of not unnecessary code is included (for other boards)
 - No support for on the fly rotating
 - No auto of the box support for touch
-- A lot of configuring to do before it all works
 
 This library uses the "official" drivers from Espressif's component service. These drivers use the newly introduced esp_lcd_panel interfaces.
 This should provide some support in the future for updates and new boards.
@@ -29,8 +29,8 @@ They can be bought in the [Sunton Store](https://www.aliexpress.com/store/110019
 
 | Type            | CPU       | Display | Size  | Controller                                | Rotate support  | LV_COLOR_16_SWAP  | Touch                                     | Audio  | Flash  | RGB LED  | CDS    | Link|
 |---              |---        |---      |--     |---                                        |---              |---                |---                                        |---     |---     |---       |---     |--- |
-| ESP32-2424S012N | ESP32-C3  | 240x240 | 1.2"  | [GC9A01A](assets/datasheets/GC9A01A.pdf)  |                 | yes               | n/a                                       | no     | no     | no       | no     | [Ali Express](https://www.aliexpress.com/item/1005005453515690.html) |
-| ESP32-2424S012C | ESP32-C3  | 240x240 | 1.2"  | [GC9A01A](assets/datasheets/GC9A01A.pdf)  |                 | yes               | [CST816S](assets/datasheets/CST816S.pdf)  | no     | no     | no       | no     | [Ali Express](https://www.aliexpress.com/item/1005005453515690.html) |
+| ESP32-2424S012N | ESP32-C3  | 240x240 | 1.2"  | [GC9A01A](assets/datasheets/GC9A01A.pdf)  | yes             | yes               | n/a                                       | no     | no     | no       | no     | [Ali Express](https://www.aliexpress.com/item/1005005453515690.html) |
+| ESP32-2424S012C | ESP32-C3  | 240x240 | 1.2"  | [GC9A01A](assets/datasheets/GC9A01A.pdf)  | yes             | yes               | [CST816S](assets/datasheets/CST816S.pdf)  | no     | no     | no       | no     | [Ali Express](https://www.aliexpress.com/item/1005005453515690.html) |
 | ESP32-2432S024N | ESP32     | 240x320 | 2.4"  | [ILI9341](assets/datasheets/ILI9341.pdf)  | yes             | yes               | n/a                                       | yes    | yes    | yes      | yes    | [Ali Express](https://www.aliexpress.com/item/1005005865107357.html) |
 | ESP32-2432S024R | ESP32     | 240x320 | 2.4"  | [ILI9341](assets/datasheets/ILI9341.pdf)  | yes             | yes               | [XPT2046](assets/datasheets/XPT2046.pdf)  | yes    | yes    | yes      | yes    | [Ali Express](https://www.aliexpress.com/item/1005005865107357.html) |
 | ESP32-2432S024C | ESP32     | 240x320 | 2.4"  | [ILI9341](assets/datasheets/ILI9341.pdf)  | yes             | yes               | [CST816S](assets/datasheets/CST816S.pdf)  | yes    | yes    | yes      | yes    | [Ali Express](https://www.aliexpress.com/item/1005005865107357.html) |
@@ -56,17 +56,6 @@ This library depends on:
 
 - LVGL (version ^8.3.2)
 
-To use the LVGL library, a `lv_conf.h` file is required to define the settings for LVGL.
-This file needs to be provided by the application.
-As this file is referenced from the build of LVGL, the path must be known.
-Normally this file is included in the include directory of **your** project so the define must be
-
-```ini
-    -D LV_CONF_PATH=${PROJECT_INCLUDE_DIR}/lv_conf.h
-```
-
-The template for the `lv_conf.h` file can be found in the LVGL library at `.pio/libdeps/esp32dev/lvgl/lv_conf_template.h`.
-
 ## How to use
 
 Basically there is only **ONE** define that need to be defined: The type of board assuming everything is default.
@@ -162,8 +151,30 @@ build_flags =
     #-D ESP32_8048S070C
 ```
 
-The path for the lv_conf.h above is `${PROJECT_INCLUDE_DIR}`.
-This needs to be specified because the LVGL library included this header file.
+## LVGL.h
+
+To use the LVGL library, a `lv_conf.h` file is required to define the settings for LVGL.
+This file needs to be provided by the application.
+As this file is referenced from the build of LVGL, the path must be known.
+Normally this file is included in the include directory of **your** project and used by the LVGL library.
+To include it globally, the define must be (for the include directory):
+
+```ini
+    -D LV_CONF_PATH=${PROJECT_INCLUDE_DIR}/lv_conf.h
+```
+
+The template for the `lv_conf.h` file can be found in the LVGL library at `.pio/libdeps/esp32dev/lvgl/lv_conf_template.h`.
+
+## LV_COLOR_16_SWAP
+
+The LVGL library has a define called **LV_COLOR_16_SWAP**. The value can be 1 (yes) or 0 (no).
+This variable will swap the byte order of the color16_t. This is required because the SPI is by default MSB first.
+Swapping these bytes will undo this. This is required for the GC9A01A, ILI9341 and ST7796 controllers.
+
+Additionally, when using the [SquareLine Studio](https://squareline.io/) for designing the user interface, the display properties (under the project settings) must match this variable.
+So, it needs to be set both in `lv_conf.h` and the corresponding display properties (16 bit swap or 16 bit).
+
+![SquareLine display properties](assets/images/Squareline-display-properties.png)
 
 ## Demo application
 
@@ -185,7 +196,7 @@ The resolution is 12 bit so valid values are from 0-1023.
 
 - November 2023
   - Major version update: 2.0.0
-  - Rewrote library to also support the new ESP32-S3 panels and new esp_lcd interface
+  - Rewrote library to also support the new ESP32-S3 panels and use new esp_lcd interface
 - October 2023
   - Added support for esp32_8048S034N/C
   - Added option for flipped/mirrored TFT's
@@ -211,4 +222,4 @@ The resolution is 12 bit so valid values are from 0-1023.
   - RGB Led output
   - CDS light sensor input
 - July 2022
-  - Initial work started
\ No newline at end of file
+  - Initial work started
diff --git a/assets/images/Squareline-display-properties.png b/assets/images/Squareline-display-properties.png
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zV{3^9lUf_D$}ByD$9fGPE%<Gd+n&z@kCArB(xyXKam04Nl9y^KC(^}b!VYxxDyq6@
zwOx6z)@D^}j3WV7oSte!rLCC5o4vQg>|ey$({ow^kr6tw5t**~Xfbf_zn)0B@_0=A
x&pN$P#Q%J><^Sl>lK($w`2WfjEQ_D}GqDm;nTs91Ks{_FBcb@FMBFgwe*gv`Xh8q~

literal 0
HcmV?d00001

diff --git a/src/smartdisplay_cst816s.c b/src/smartdisplay_cst816s.c
index a4aa19d..2240e76 100644
--- a/src/smartdisplay_cst816s.c
+++ b/src/smartdisplay_cst816s.c
@@ -14,9 +14,9 @@ static void cst816s_lvgl_touch_cb(lv_indev_drv_t *drv, lv_indev_data_t *data)
     uint16_t touchpad_y[1] = {0};
     uint8_t touchpad_cnt = 0;
 
-    /* Read touch controller data */
+    // Read touch controller data
     ESP_ERROR_CHECK(esp_lcd_touch_read_data(touch_handle));
-    /* Get coordinates */
+    // Get coordinates
     bool pressed = esp_lcd_touch_get_coordinates(touch_handle, touchpad_x, touchpad_y, NULL, &touchpad_cnt, 1);
     if (pressed && touchpad_cnt > 0)
     {
diff --git a/src/smartdisplay_gt911.c b/src/smartdisplay_gt911.c
index 4746cc3..76eb37b 100644
--- a/src/smartdisplay_gt911.c
+++ b/src/smartdisplay_gt911.c
@@ -14,9 +14,9 @@ static void gt911_lvgl_touch_cb(lv_indev_drv_t *drv, lv_indev_data_t *data)
     uint16_t touchpad_y[1] = {0};
     uint8_t touchpad_cnt = 0;
 
-    /* Read touch controller data */
+    // Read touch controller data
     ESP_ERROR_CHECK(esp_lcd_touch_read_data(touch_handle));
-    /* Get coordinates */
+    // Get coordinates
     bool pressed = esp_lcd_touch_get_coordinates(touch_handle, touchpad_x, touchpad_y, NULL, &touchpad_cnt, 1);
     if (pressed && touchpad_cnt > 0)
     {
diff --git a/src/smartdisplay_xpt2046.c b/src/smartdisplay_xpt2046.c
index 61a96e2..e07e72f 100644
--- a/src/smartdisplay_xpt2046.c
+++ b/src/smartdisplay_xpt2046.c
@@ -14,7 +14,9 @@ static void xpt2046_lvgl_touch_cb(lv_indev_drv_t *drv, lv_indev_data_t *data)
     uint16_t touchpad_y[1] = {0};
     uint8_t touchpad_cnt = 0;
 
+    // Read touch controller data
     ESP_ERROR_CHECK(esp_lcd_touch_read_data(touch_handle));
+    // Get coordinates
     bool pressed = esp_lcd_touch_get_coordinates(touch_handle, touchpad_x, touchpad_y, NULL, &touchpad_cnt, 1);
     if (pressed && touchpad_cnt > 0)
     {