ST7789V Driver

[shamirtahir50]

Hi,

I am using TFT024B045 which contains ST7789V, I am programmoing it using ESP32.

I am defining this in User_Setup.h

#define ESP32_PARALLEL

#define ST7789_DRIVER

// ESP32 pins used for the parallel interface TFT
#define TFT_CS 27 // Chip select control pin
#define TFT_DC 14 // Data Command control pin - must use a pin in the range 0-31
#define TFT_RST 26 // Reset pin

#define TFT_WR 12 // Write strobe control pin - must use a pin in the range 0-31
#define TFT_RD 13

#define TFT_D0 16 // Must use pins in the range 0-31 for the data bus
#define TFT_D1 4 // so a single register write sets/clears all bits
#define TFT_D2 23
#define TFT_D3 22
#define TFT_D4 21
#define TFT_D5 19
#define TFT_D6 18
#define TFT_D7 17

Is this the right way?
I need to change the pin configuration or not?
Do you have any documentation about that?

[shamirtahir50]

TFT024B045 Data Sheet
TFT024B045-2.4inch-IPS-ST7789V-MCU 16bit.pdf

ST7789V Data Sheet
ST7789V_SPEC_V1.2.pdf

Pin Configuration is mentioned in the tft data sheet

[Bodmer]

The display module has a 16 bit parallel interface. The only processor in the library that supports 16 bit parallel interface is the RP2040.

It appears the IMx pins (that set the interface mode) are not accessible.

[shamirtahir50]

So, the pinout is the following,

Should I define this way?

#define TFT_CS 27 // Chip select control pin
#define TFT_DC 14 // Data Command control pin - must use a pin in the range 0-31
#define TFT_RST 26 // Reset pin

#define TFT_WR 12 // Write strobe control pin - must use a pin in the range 0-31
#define TFT_RD 13
// will add backlight anode here
#define TFT_D0 16 // Must use pins in the range 0-31 for the data bus
#define TFT_D1 4 // so a single register write sets/clears all bits
#define TFT_D2 23
#define TFT_D3 22
#define TFT_D4 21
#define TFT_D5 19
#define TFT_D6 18
#define TFT_D7 17

or this pinout

#define TFT_SPI_PORT 1

// Pins - the PIO will control MOSI, SCLK, and DC pins
// Any digital GPIO pins may be used
// #define TFT_MISO -1 // MISO is not used or supported
#define TFT_MOSI 11
#define TFT_SCLK 10
#define TFT_CS 9 // Chip select control pin
#define TFT_DC 8 // Data Command control pin
#define TFT_RST 12 // Reset pin (could connect to Arduino RESET pin
#define TFT_BL 13 // LED backlight
#define TFT_BACKLIGHT_ON HIGH

My LCD data sheet does not mention SPI pins explicitly.

In the second one, I do not know which pin will be connected from the LCD pinout to SCLK. And will it work with only 6 pins connected?

[Bodmer]

Neither will work. As previously stated, the display is for 16 bit parallel interface only, that means 16 data bus connections are required.

[UmerSoftwares]

Is there any wiring information to connect this LCD to Rasberry PI pico that has RP2040 ?

[Bodmer]

Here are the connections I have used with the RP2040:
https://github.com/Bodmer/TFT_eSPI/blob/master/User_Setups/Setup107_RP2040_ILI9341_16bit_parallel.h