MRB3511

14 GPIOs are required to drive the 8-bit parallel display. Another 3 GPIOs are needed for the I²C touch sensor. Including the Vcc, Gnd an Rst pins, a total of 23 connections need to be made to the MCU:

Pin Configuration~

Pin	Function	ESP32 Pin	Config Name	Display Pin
1	Chip select control pin	GPIO33	TFT_CS	CS
2	Data Command control pin	GPIO15	TFT_DC	RS
3	Write control pin	GPIO04	TFT_WR	WR
4	Read control pin	GPIO02	TFT_RD	RD
5	LCD Reset pin	GPIO32	TFT_RST	RST
6		GPIO12	TFT_D0	D0
7		GPIO13	TFT_D1	D1
8		GPIO26	TFT_D2	D2
9	8-bit parallel data	GPIO25	TFT_D3	D3
10		GPIO17	TFT_D4	D4
11		GPIO16	TFT_D5	D5
12		GPIO27	TFT_D6	D6
13		GPIO14	TFT_D7	D7
14-21	Not used, don't connect	NC		D8-15
22	Module Ground	GND		GND
23	LED Backlight PWM	GPIO5	TFT_BCKL	BL
24-25	Module Power	-		VDD
26-27	Module Ground	GND		GND
28-29	Not connected			NC
30	IO, I²C SDA	GPIO21	TOUCH_SDA	SDA
31	Touch Chip Interrupt	GPIO34	TOUCH_IRQ	INT
32	Not connected			NC
33	Touch IC Reset	3.3V		CRST
34	IO, I²C SCL	GPIO22	TOUCH_SCL	SCL

You need to desolder the 0R resistor on the back side of the panel from the 16-bit position. Then solder back the 0R resistor in the 8-bit position.

There are no pins shared between the touch controller and the LCD controller.

LCD Configuration~

The lcd_config.ini file specifies the different properties of the display, except for the actual pin configuration:

mrb3511 =
    -D ESP32_PARALLEL=1
    -D ILI9488_DRIVER=1
    -D TFT_WIDTH=320
    -D TFT_HEIGHT=480
    -D TFT_ROTATION=0 ; 0=0, 1=90, 2=180 or 3=270 degree
    -D USER_SETUP_LOADED=1
    -D TOUCH_DRIVER=911 ; GT911 Capacitive touch panel driver
    -D SUPPORT_TRANSACTIONS

HASP build_flags~

Specify the LCD Configuration to use and define the 17 GPIOs in the environment build flags:

build_flags =
    ${flags.esp32_flags}
; -- TFT_eSPI build options ------------------------
    ${lcd.mrb3511}
    -D TFT_BCKL=5  ;None, configurable via web UI (e.g. 2 for D4)
    -D TFT_CS=33  ; Chip select control pin
    -D TFT_DC=15  ; =RS; Data Command control pin - must use a pin in the range 0-31
    -D TFT_RST=32 ; Reset pin
    -D TFT_WR=4   ; Write strobe control pin - must use a pin in the range 0-31
    -D TFT_RD=2
    -D TFT_D0=12  ; Must use pins in the range 0-31 for the data bus
    -D TFT_D1=13  ; so a single register write sets/clears all bits
    -D TFT_D2=26
    -D TFT_D3=25
    -D TFT_D4=17
    -D TFT_D5=16
    -D TFT_D6=27
    -D TFT_D7=14
    -D TOUCH_SDA=21
    -D TOUCH_SCL=22
    -D TOUCH_IRQ=34   ; use 34-39 as these are input only pins
    -D TOUCH_RST=-1   ; not used, connected to 3.3V