WT32-SC01 with LCD ST7796, TFT_espi > readRect not working

[elC1a]

Hello Thanks for TFT_eSPI! WT32-SC01 with LCD ST7796, TFT_eSPI > tft.readRect is not working. TFT_eSPI > tft.pushRect displays always a black rectangle. Also the Animated_dial example isn't working correct with the WT32-SC01 device. Arduino code below. Is something wrong with my code or my setup? I like the WT32-SC01 device and a solution for the problem would be very, very nice.

// // Content - WT32-SC01 with LCD ST7796, TFT_eSPI > tft.readRect not working // --------------------------------------------------------------------------------------- // Device WT32-SC01 - http://myosuploads3.banggood.com/products/20220111/20220111020446WT32-SC01DataSheetV3.3.pdf // LCD Device ST7796 - https://cdn.hackaday.io/files/1625926956336128/ST7796S.pdf // Touch Device FT6336U - https://focuslcds.com/content/FT6236.pdf // FT6336U library - https://github.com/aselectroworks/Arduino-FT6336U // TFT_eSPI library - https://github.com/Bodmer/TFT_eSPI //

include // TFT_espi Library

TFT_eSPI tft = TFT_eSPI();

uint16_t* tft_buffer;

void setup() { // Init tft.init(); tft.setRotation(1); tft.fillScreen(0x001F);

// Create content to read from screen tft.setTextColor(0xFFFF); tft.setTextSize(2); tft.fillRect(200, 80, 96, 48, 0x03E0); tft.setCursor(208, 96, 1); tft.print("Example");

// Create buffer with specific size tft_buffer = (uint16_t) malloc( ((96) + 8) ((48) + 8) * 2 );

// Read rectangle from screen to buffer tft.readRect(200, 80, 96, 48, tft_buffer);

// Paste back rectangle from buffer to screen tft.pushRect(200, 180, 96, 48, tft_buffer); }

void loop() {

}

Setup201_WT32_SC01.h below.

// USER DEFINED SETTINGS // Set driver type, fonts to be loaded, pins used and SPI control method etc // // See the User_Setup_Select.h file if you wish to be able to define multiple // setups and then easily select which setup file is used by the compiler. // // If this file is edited correctly then all the library example sketches should // run without the need to make any more changes for a particular hardware setup! // Note that some sketches are designed for a particular TFT pixel width/height

define USER_SETUP_ID 201

// LCD Device: ST7796

define ST7796_DRIVER

//#define TFT_WIDTH 480 //#define TFT_HEIGHT 320

define TFT_BACKLIGHT_ON HIGH

define USE_HSPI_PORT

define TFT_MISO 12

define TFT_MOSI 13

define TFT_SCLK 14

define TFT_CS 15

define TFT_DC 21

define TFT_RST 22

define TFT_BL 23

// Touch Device: FT6336U

define PIN_SDA 18

define PIN_SCL 19

//#define TFT_SDA_READ // This option is for ESP32 ONLY, tested with ST7789 and GC9A01 display only

define TOUCH_CS -1 // Chip select pin (T_CS) of touch screen

define LOAD_GLCD // Font 1. Original Adafruit 8 pixel font needs ~1820 bytes in FLASH

define LOAD_FONT2 // Font 2. Small 16 pixel high font, needs ~3534 bytes in FLASH, 96 characters

define LOAD_FONT4 // Font 4. Medium 26 pixel high font, needs ~5848 bytes in FLASH, 96 characters

define LOAD_FONT6 // Font 6. Large 48 pixel font, needs ~2666 bytes in FLASH, only characters 1234567890:-.apm

define LOAD_FONT7 // Font 7. 7 segment 48 pixel font, needs ~2438 bytes in FLASH, only characters 1234567890:-.

define LOAD_FONT8 // Font 8. Large 75 pixel font needs ~3256 bytes in FLASH, only characters 1234567890:-.

define LOAD_GFXFF // FreeFonts. Include access to the 48 Adafruit_GFX free fonts FF1 to FF48 and custom fonts

define SMOOTH_FONT

// SPI frequency for TFT writes // #define SPI_FREQUENCY 10000000 // #define SPI_FREQUENCY 20000000

define SPI_FREQUENCY 27000000

// #define SPI_FREQUENCY 40000000 // #define SPI_FREQUENCY 80000000

// Optional reduced SPI frequency for reading TFT

define SPI_READ_FREQUENCY 6000000

//20000000

[Bodmer]

A bi-directional SDA pin interface to the TFT is not supported when the HSPI port is used.

If the VSPI port is used then

define TFT_SDA_READ

In the setup file invokes bi-directional interface reads.

[elC1a]

Thanks for the answer. Edited in the above Setup201_WT32_SC01.h: //#define USE_HSPI_PORT

define TFT_SDA_READ

Isn't working. The same black rectangle. Is there anything else i should do? The real project is more complex and to draw the screen into a big sprite to restore the other small sprite rectangle on the screen is suboptimal.

[elC1a]

// // WT32-SC01, LCD ST7796 - Screen in Sprite to restore screen content if tft.readRect is not working // --------------------------------------------------------------------------------------- // Device WT32-SC01 - http://myosuploads3.banggood.com/products/20220111/20220111020446WT32-SC01DataSheetV3.3.pdf // LCD Device ST7796 - https://cdn.hackaday.io/files/1625926956336128/ST7796S.pdf // Touch Device FT6336U - https://focuslcds.com/content/FT6236.pdf // FT6336U library - https://github.com/aselectroworks/Arduino-FT6336U // TFT_eSPI library - https://github.com/Bodmer/TFT_eSPI //

include // TFT_eSPI Library

TFT_eSPI tft = TFT_eSPI(); TFT_eSprite spriteScreen = TFT_eSprite(&tft); // Sprite screen object TFT_eSprite spriteButton = TFT_eSprite(&tft); // Sprite button object

int16_t screenWidth = 480; int16_t screenHeight = 320; int16_t buttonWidth = 96; int16_t buttonHeight = 48; int16_t angle, min_x, min_y, max_x, max_y;

void setup() { // Init tft.init(); tft.setRotation(1); tft.setPivot(screenWidth / 2, screenHeight / 2);

// Create sprite screen with content
spriteScreen.setColorDepth(16); spriteScreen.createSprite(screenWidth, screenHeight); spriteScreen.fillSprite(0x001F); // Fill color blue spriteScreen.setTextColor(0xFFFF); // Text color white spriteScreen.setTextSize(2); spriteScreen.fillRect(192, 88, 96, 48, 0x03E0); // Fill color green spriteScreen.setCursor(198, 96, 2); spriteScreen.print("Screen");

// Create sprite button with content spriteButton.setColorDepth(16); spriteButton.createSprite(buttonWidth, buttonHeight); spriteButton.fillSprite(0xFFE0); // Fill color yellow spriteButton.drawRect(6, 3, buttonWidth - 12, buttonHeight - 6, 0xF800); spriteButton.setPivot(buttonWidth / 2, buttonHeight / 2); // Set pivot point in sprite spriteButton.setTextColor(0xFFFF); // Text color white spriteButton.setTextSize(2); spriteButton.setCursor(12, 6, 2); spriteButton.print("Sprite");

// Write sprite screen to TFT spriteScreen.pushSprite(0, 0); }

void loop() { delay(3000);

// Draw button and get position and size angle = random(360); // Random angle spriteButton.pushRotated(angle,0xFFE0); // Sprite background color is the transparent color spriteButton.getRotatedBounds(angle, &min_x, &min_y, &max_x, &max_y); delay(3000);

// Restore screen - UPDATE spriteScreen.pushSprite((int32_t)min_x, (int32_t)min_y, (int32_t)min_x, (int32_t)min_y, (int32_t)max_x - (int32_t)min_x, (int32_t)max_y - (int32_t)min_y); //tft.fillRect(min_x, min_y, max_x - min_x, max_y - min_y, 0xFFFF); // Testing the complete rectange of the sprite }

[elC1a]

At the end i think reading from LCD isn't supported by the WT32-SC01 device.