Unable to use RP2040 and 3.5" TFT Capacitive Touch Screen(ST7796SU1)

[gigwegbe]

Hello Team,
I'm unable to use RP2040 and 3.5" TFT Capacitive Touch Screen(ST7796SU1). It is not displaying anything.
Board details: LInk1, Link2
Here is my setup code:

// See SetupX_Template.h for all options available
#define USER_SETUP_ID 36

#define RPI_DISPLAY_TYPE
#define ST7796_DRIVER


#define TFT_MISO  4
#define TFT_MOSI  3
#define TFT_SCLK  2
#define TFT_CS    5  // Chip select control pin
#define TFT_DC    6  // Data Command control pin
#define TFT_RST   7  // Reset pin (could connect to RST pin)
#define TFT_RST  10  // Set TFT_RST to -1 if display RESET is connected to ESP32 board RST

#define TOUCH_CS  22 //22     // Chip select pin (T_CS) of touch screen

// Touch Device
#define PIN_SDA 8
#define PIN_SCL 9

#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

// For the RP2040 processor define the SPI port channel used (default 0 if undefined)
#define TFT_SPI_PORT 0 // Set to 0 if SPI0 pins are used, or 1 if spi1 pins used


#define SPI_FREQUENCY  20000000
#define SPI_TOUCH_FREQUENCY  2500000

[ballistRC]

Unless you have changed them, the usual default for a PIco rp2040 MOSI 19, SCLK18, MISO16. SPI0.

[gigwegbe]

@ballistRC I did change it in the above setup file. Or is there any other place I need to change it ?

[Bodmer]

I can see why you thought the following line was needed but delete it. That line invokes a driver for displays intended to connect to the original Linux based Rasperry Pis. Delete this line:

#define RPI_DISPLAY_TYPE

Note that you will need another library for the capacitance touch screen, TFT_eSPI does not support it. So there is no point in adding these lines to the setup, delete them:

#define TOUCH_CS  22 //22     // Chip select pin (T_CS) of touch screen

// Touch Device
#define PIN_SDA 8
#define PIN_SCL 9

Compile and upload again to try the new settings. Run the Read_User_Setup sketch and check the serial monitor output, this shows if the compiler is picking up your settings.

[gigwegbe]

Here's the updated setup code and the output of the Read_User_Setup sketch.

// See SetupX_Template.h for all options available
#define USER_SETUP_ID 36

#define ST7796_DRIVER


#define TFT_MISO  4
#define TFT_MOSI  3
#define TFT_SCLK  2
#define TFT_CS    5  // Chip select control pin
#define TFT_DC    6  // Data Command control pin
#define TFT_RST   7  // Reset pin (could connect to RST pin)
#define TFT_RST  10  // Set TFT_RST to -1 if display RESET is connected to ESP32 board RST


#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

// For the RP2040 processor define the SPI port channel used (default 0 if undefined)
#define TFT_SPI_PORT 0 // Set to 0 if SPI0 pins are used, or 1 if spi1 pins used


#define SPI_FREQUENCY  20000000
#define SPI_TOUCH_FREQUENCY  2500000

Output:

15:57:17.196 -> Font 2      loaded
15:57:17.196 -> Font 4      loaded
15:57:17.196 -> Font 6      loaded
15:57:17.196 -> Font 7      loaded
15:57:17.196 -> Font 8      loaded
15:57:17.196 -> Smooth font enabled
15:57:17.196 -> 
15:57:17.196 -> Display SPI frequency = 20.00
15:57:17.196 -> [/code]
15:57:20.213 -> 
15:57:20.213 -> [code]
15:57:20.213 -> TFT_eSPI ver = 2.5.41
15:57:20.213 -> Processor    = RP2040
15:57:20.213 -> Transactions = Yes
15:57:20.213 -> Interface    = SPI
15:57:20.213 -> Display driver = 7796
15:57:20.213 -> Display width  = 320
15:57:20.213 -> Display height = 480
15:57:20.213 -> 
15:57:20.213 -> MOSI    = GPIO 3
15:57:20.213 -> MISO    = GPIO 4
15:57:20.213 -> SCK     = GPIO 2
15:57:20.213 -> TFT_CS   = GPIO 5
15:57:20.213 -> TFT_DC   = GPIO 6
15:57:20.213 -> TFT_RST  = GPIO 10
15:57:20.213 -> 
15:57:20.213 -> Font GLCD   loaded
15:57:20.213 -> Font 2      loaded
15:57:20.213 -> Font 4      loaded
15:57:20.213 -> Font 6      loaded
15:57:20.213 -> Font 7      loaded
15:57:20.213 -> Font 8      loaded
15:57:20.213 -> Smooth font enabled
15:57:20.213 -> 
15:57:20.213 -> Display SPI frequency = 20.00
15:57:20.213 -> [/code]

I also tried the Cellular_Automata example sketch from 480 * 320 and still did not display anything.

[gigwegbe]

Update: It is working now. Thanks. Here's the updated settings.

// See SetupX_Template.h for all options available
#define USER_SETUP_ID 36

#define ST7796_DRIVER


#define TFT_MISO  4
#define TFT_MOSI  3
#define TFT_SCLK  2
#define TFT_CS    5  // Chip select control pin
#define TFT_DC    6  // Data Command control pin
#define TFT_RST   7  // Reset pin (could connect to RST pin)

#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

// For the RP2040 processor define the SPI port channel used (default 0 if undefined)
#define TFT_SPI_PORT 0 // Set to 0 if SPI0 pins are used, or 1 if spi1 pins used


#define SPI_FREQUENCY  20000000
#define SPI_TOUCH_FREQUENCY  2500000

[nlothian]

Just noting for others looking that this is a working config for the 52Pi EP-0172 board.

[jestepp]

So i am able to get my Rpi Pico to show things on the screen but not able to recieve touch feedback from GP8/9 for some reason. Not really sure what i am doing wrong. Big Sad this is for i am using micropython.