esp-idf-parallel-tft

8 bit parallel TFT & 4-line resistance touch screen Driver for esp-idf.
You can use such a TFT-Shield with esp32.

Support driver

Generic Shield

ILI9225
ILI9226(Same as ILI9225)
ILI9320
ILI9325
ILI9341
ILI9342
ILI9481
ILI9486
ILI9488
SPFD5408(Same as ILI9320)
R61505U(Same as ILI9320)
R61509V
LGDP4532
ST7775(Same as ILI9225)
ST7781
ST7783(Same as ST7781)
ST7793(Same as R61509)
ST7796(Same as ILI9486)
HX8347A(*2)
HX8347D(Almost the same as HX8347A)(*2)
HX8347G(Same as HX8347D)(*2)
HX8347I(Same as HX8347D)(*2)

OPEN-SMART Products

OPEN-SMART ILI9225 TFT-Shield(176x220)(*5)
OPEN-SMART ILI9327 TFT-Shield(240x400)(*3)(*5)
OPEN-SMART ILI9340 TFT-Shield(240x320)(*5)
OPEN-SMART S6D1121 16Pin-Parallel(240x320)(*1)(*5)
OPEN-SMART ST7775 16Pin-Parallel(176x220 Same as ILI9225)(*1)(*5)
OPEN-SMART ST7783 16Pin-Parallel(240x320)(*1)(*5)
OPEN-SMART R61509V 16Pin-Parallel(240x400)(*1)(*5)
OPEN-SMART ILI9488 16Pin-Parallel(320x400 Color inversion)(*1)(*4)(*5)

(*1)
I2S parallel does not work.
I don't know why.
GPIO parallel or REGISTER I/O parallel works.
LED pins connect to GND instead of 3.3V.

(*2)
Very Slow.
Most drivers require three commands to display one Pixel.
This driver require 9 commands to display one Pixel.
For some reason, the color of 0xFFFF does not appear.

(*3)
It has a GRAM offset.
See below.

(*4)
Need RGB inverstion.

(*5)
4-line resistance touch screen available.
See below.

These are all 2.4 inch, 320x240 TFTs.

3.95 inches is almost twice as large as 2.4 inches.

These are OPEN-SMART 16Pin-Parallel Products.

These are OPEN-SMART TFT-Shield Products.

Software requirements

ESP-IDF V5.0 or later.
ESP-IDF V4.4 release branch reached EOL in July 2024.

Note for ESP-IDF V5.x
ESP-IDF V5.x gives this warning, but work.

#warning "legacy adc driver is deprecated, please migrate to use esp_adc/adc_oneshot.h and esp_adc/adc_continuous.h for oneshot mode and continuous mode drivers respectively"

Installation

git clone https://github.com/nopnop2002/esp-idf-parallel-tft
cd esp-idf-parallel-tft/
idf.py set-target {esp32/esp32s2/esp32s3}
idf.py menuconfig
idf.py flash

Note for ESP32-S2
The tjpgd library is not present in ESP32-S2 ROM.
With ESP-IDF Ver5, the JPEG decode library is now provided from the IDF Component Registry, and the JPEG decode library is now available for ESP32-S2.
However, since the SRAM is small, a large image cannot be displayed.
With ESP-IDF Ver4.4, you cannot be displayed JPEG files because the IDF Component Registry cannot be used.
Due to the small SRAM capacity, there is a possibility that an error may occur when displaying PNG files.
You can avoid this error by enabling PSRAM.

Configuration

You have to set this config value with menuconfig.

CONFIG_DRIVER

The information provided by sellers on Ebay or AliExpress is largely incorrect.
You waste time if you don't choose the right driver.
There are many variations of the 2.4 inch shield.
You can use this to find out your driver.
This is for Arduino UNO.
Do not use this on the ESP32 as the GPIO on the ESP32 is not 5V tolerant.
Never believe the seller's information.
I'll say it again.
Never believe the seller's information.
CONFIG_INTERFACE
Most drivers work using I2S parallel.
However, some drivers only work using GPIO parallels or REGISTER I/O parallels.
I2S parallel is the fastest when drawing to consecutive addresses.
However, REGISTER I/O parallel is the fastest when drawing to non-contiguous addresses.
When using REGISTER I/O parallel, GPIO from D0 to D7 is 1 to 31.(GPIO0 is boot mode pin)
I2S parallel is suitable for image-intensive applications.
REGISTER I/O parallel is suitable for character-intensive applications.
GPIO parallel is most slow.
CONFIG_WIDTH
CONFIG_HEIGHT
Specifies the resolution of the TFT.
CONFIG_OFFSETX
CONFIG_OFFSETY
You can specify the GRAM offset.
You must specify Y offset = 32 for OPEN-SMART-ILI9327.
CONFIG_INVERSION
For some TFTs, the BGR may be inverted.
Specify if the colors are inverted.

Wireing

TFT		ESP32	ESP32S2/S3
LDC_RST	--	GPIO32	GPIO45	*1
LDC_CS	--	GPIO33	GPIO42	*1
LDC_RS	--	GPIO15	GPIO41	*1
LDC_WR	--	GPIO4	GPIO40	*1
LDC_RD	--	GPIO2	GPIO39	*1
LDC_D0	--	GPIO12	GPIO1	1 2
LDC_D1	--	GPIO13	GPIO2	1 2
LDC_D2	--	GPIO26	GPIO3	1 2
LDC_D3	--	GPIO25	GPIO4	1 2
LDC_D4	--	GPIO17	GPIO5	1 2
LDC_D5	--	GPIO16	GPIO6	1 2
LDC_D6	--	GPIO27	GPIO7	1 2
LDC_D7	--	GPIO14	GPIO8	1 2
5V	--	5V	5V	*3
3.3V	--	3.3V	3.3V	*3
GND	--	GND	GND

(*1)
You can change any GPIO using menuconfig.

(*2)
When using REGISTER I/O parallel, GPIO from D0 to D7 is 1 to 31.(GPIO0 is boot mode pin)

(*3)
With a regulator (mostly AMS1117) is on the back, the supply voltage is 5V.
With a regulator is NOT on the back, the supply voltage is 3.3V.

Note
My R61509V has a regulator on the back.
Normally, a TFT with a regulator works at 5V, but my R61509V doesn't work unless I supply both 5V and 3.3V.

Note
ESP32 development board cannot supply too much current.
It is more stable when supplied from an external power source.

Graphic support

Fonts support

It's possible to text rotation and invert.
You can specify multiple fonts at the same time.

Image support

BMP file
JPEG file
PNG file

Using Wemos D1 ESP32

I bought this for $4.

To attach the TFT-Shield, you need to do changed some pin assignments like this.
Because GPIO34/35/36/39 are READ ONLY.

With this change, GPIO will look like this:

It's great because it doesn't require any wiring.

If you use OPEN-SMART TFT-Shield Products, you must use custom GPIO.

Using TZT D1 ESP32-S3

I bought this for $5.

You can attach the TFT-Shield without changing anything.
But I2S parallel doesn't work. I don't know why.

If you use TZT D1 ESP32-S3, you must use custom GPIO.

JPEG Decoder

The ESP-IDF component includes Tiny JPEG Decompressor.
The document of Tiny JPEG Decompressor is here.
This can reduce the image to 1/2 1/4 1/8.

PNG Decoder

The ESP-IDF component includes part of the miniz library, such as mz_crc32.
But it doesn't support all of the miniz.
The document of miniz library is here.

And I ported the pngle library from here.
This can reduce the image to any size.

Font File

This project uses the following as default fonts:

font/ILGH16XB.FNT // 8x16Dot Gothic
font/ILGH24XB.FNT // 12x24Dot Gothic
font/ILGH32XB.FNT // 16x32Dot Gothic
font/ILMH16XB.FNT // 8x16Dot Mincyo
font/ILMH24XB.FNT // 12x24Dot Mincyo
font/ILMH32XB.FNT // 16x32Dot Mincyo

From 0x00 to 0x7f, the characters image of Alphanumeric are stored.
From 0x80 to 0xff, the characters image of Japanese are stored.
Changing this file will change the font.

You can add your original fonts.
The format of the font file is the FONTX format.
Your font file is put in font directory.
Your font file is uploaded to SPIFFS partition using meke flash.

Please refer this page about FONTX format.

Font File Editor(FONTX Editor)

There is a font file editor.
This can be done on Windows 10.
Developer page is here.

Convert from BDF font to FONTX font

step1)
download fontxedit.exe.

step2)
download BDF font file from Internet.
I downloaded from here.
fontxedit.exe can ONLY import Monospaced bitmap fonts file.
Monospaced bitmap fonts can also be downloaded here.

step3)
import the BDF font file into your fontxedit.exe.
this tool can convert from BDF to FONTX.

step4)
adjust font size.

step5)
check font pattern.
when you have made any changes, press the apply button.

step6)
save as .fnt file from your fontedit.exe.

step7)
upload your font file to $HOME/esp-idf-ili9340/font directory.

step8)
add font to use

FontxFile fx32L[2];
InitFontx(fx32L,"/spiffs/LATIN32B.FNT",""); // 16x32Dot LATIN

Font file that From 0x00 to 0x7f, the characters image of Standard ASCII are stored.

Font file that From 0x80 to 0xff, the characters image of Japanese are stored.

Font file that From 0x80 to 0xff, the characters image of Latin are stored.

u8g2 library contains many BDF fonts.
This was converted from emoticons21.bdf.

This was converted from Scroll-o-Sprites.bdf.

Convert from TTF font to FONTX font

step1)
Download WFONTX64.exe from here. Developer page is here.

step2)
Select ttf font.

step3)
Enter Height, Width, FontX2 name.
Specify half of Height for Width.
Specify your favorite font name in the FontX2 name field using up to 8 characters.

step4)
Specify the file name to save.

step5)
Specify the font style as required.

step6)
Press the RUN button to convert TTF fonts to FONTX format.

step7)
upload your font file to $HOME/esp-idf-ili9340/font directory.

step8)
add font to use

    FontxFile fx16G[2];
    FontxFile fx24G[2];
    FontxFile fx32G[2];
    //InitFontx(fx16G,"/spiffs/ILGH16XB.FNT",""); // 8x16Dot Gothic
    //InitFontx(fx24G,"/spiffs/ILGH24XB.FNT",""); // 12x24Dot Gothic
    //InitFontx(fx32G,"/spiffs/ILGH32XB.FNT",""); // 16x32Dot Gothic
    InitFontx(fx16G,"/spiffs/Gigi16.FNT",""); // 8x16Dot Gigi
    InitFontx(fx24G,"/spiffs/Gigi24.FNT",""); // 12x24Dot Gigi
    InitFontx(fx32G,"/spiffs/Gigi32.FNT",""); // 16x32Dot Gigi

4-line resistance touch screen

Some TFT has 4-line resistance touch screen.
The 4-line resistor touch screen uses 4 pins.

X(+):Digital Output
X(-):Digital Output/Analog Input
Y(+):Digital Output/Analog Input
Y(-):Digital Output

When using GPIO Parallel Interface or REGISTER Parallel Interface, you can enable 4-line resistance touch screen using menuconfig.

ESP-IDF cannot simultaneous both digital output and analog input using a single gpio.
Two GPIOs are required for simultaneous digital output and analog input.
(X-) and ESP32 are connected with two wires.
(Y+) and ESP32 are connected with two wires.

(X-) ----+---- Gpio for Digital Output(Using GPIO number)
         +---- Gpio for Analog Input(Using ADC1 Channel number)

(Y+) ----+---- Gpio for Digital Output(Using GPIO number)
         +---- Gpio for Analog Input(Using ADC1 Channel number)

Configuration for touch screen

ADC Channel
When reading analog values, ESP-IDF can use ADC1 and ADC2.
This project use ADC1 to read analog value.
ESP32 has 8 channels: GPIO32 - GPIO39.
ESP32S2/S3 has 10 channels: GPIO01 - GPIO10.
Refer to the ESP32 data sheet for the relationship between ADC channels and GPIOs.
When using ADC1_6(ADC1 Channel#6) and ADC1_7(ADC1 Channel#7), the following wiring is additionally required.

TFT	ADC1	ESP32	ESP32S2/S3
LCD-WR(Y+)	Channel#6	GPIO34	GPIO07
LCD-RS(X-)	Channel#7	GPIO35	GPIO08

GPIO number
It uses four GPIOs, but the GPIOs differ depending on the TFT model.

Save calibration data to NVS
Write calibration data to NVS.
Read calibration data from NVS when starting the firmware and use it.
If you use the same TFT, you don't need to calibrate again.
To clear the calibration data recorded in NVS, execute the following command.

idf.py erase_flash

OPEN-SMART 16Pin-Parallel Products

X(+)	X(-)	Y(+)	Y(-)
LCD_D6	LCD_RS	LCD_WR	LCD_D7

OPEN-SMART TFT-Shield Products

There is no marking about 4-line resistance touch screen.
But 4-line resistance touch screen available.

X(+)	X(-)	Y(+)	Y(-)
LCD_D6	LCD_RS	LCD_WR	LCD_D7

When using ADC1_6(ADC1 Channel#6) and ADC1_7(ADC1 Channel#7), the following wiring is additionally required.

TFT		ESP32	ESP32S2/S3
LCD_WR(Y+)		ADC1_6(GPIO34)	ADC1_6(GPIO07)
LCD_RS(X-)		ADC1_7(GPIO35)	ADC1_7(GPIO08)

4-line resistance touch screen cannot be used with the Wemos D1 ESP32.
Because the combination of GPIO and ADC does not match.

ELEGOO TFT-Shield Products

There is no marking about 4-line resistance touch screen.
But 4-line resistance touch screen available.

X(+)	X(-)	Y(+)	Y(-)
LCD_D0	LCD_RS	LCD_CS	LCD_D1

When using ADC1_6(ADC1 Channel#6) and ADC1_7(ADC1 Channel#7), the following wiring is additionally required.

TFT		ESP32	ESP32S2/S3
LCD_CS(Y+)		ADC1_6(GPIO34)	ADC1_6(GPIO07)
LCD_RS(X-)		ADC1_7(GPIO35)	ADC1_7(GPIO08)

No additional wiring is required when using the Wemos D1 ESP32.
LCD_CS is assigned to ADC1_6 and LCD_RS is assigned to ADC1_7.

ILI9341 2.4inch TFT-Shield with Yellow Pin-header

There is no marking about 4-line resistance touch screen.
But 4-line resistance touch screen available.

X(+)	X(-)	Y(+)	Y(-)
LCD_D0	LCD_RS	LCD_CS	LCD_D1

When using ADC1_6(ADC1 Channel#6) and ADC1_7(ADC1 Channel#7), the following wiring is additionally required.

TFT		ESP32	ESP32S2/S3
LCD_CS(Y+)		ADC1_6(GPIO34)	ADC1_6(GPIO07)
LCD_RS(X-)		ADC1_7(GPIO35)	ADC1_7(GPIO08)

No additional wiring is required when using the Wemos D1 ESP32.
LCD_CS is assigned to ADC1_6 and LCD_RS is assigned to ADC1_7.

ILI9486 3.5inch TFT-Shield

There is no marking about 4-line resistance touch screen.
But 4-line resistance touch screen available.

X(+)	X(-)	Y(+)	Y(-)
LCD_D6	LCD_RS	LCD_WR	LCD_D7

When using ADC1_6(ADC1 Channel#6) and ADC1_7(ADC1 Channel#7), the following wiring is additionally required.

TFT		ESP32	ESP32S2/S3
LCD_WR(Y+)		ADC1_6(GPIO34)	ADC1_6(GPIO07)
LCD_RS(X-)		ADC1_7(GPIO35)	ADC1_7(GPIO08)

4-line resistance touch screen cannot be used with the Wemos D1 ESP32.
Because the combination of GPIO and ADC does not match.

Other TFT

I don't know which pin is X(+), X(-), Y(+), Y(-).
If you find, please tell me.

Calibrating the touch screen

Keep touching the corner point.

Draw with touch

If there is no touch for 10 seconds, it will end.

Button with touch

You can only enter up to 15 characters.
If there is no touch for 10 seconds, it will end.

Move with touch

If there is no touch for 10 seconds, it will end.

Menu with Touch

If there is no touch for 10 seconds, it will end.

Select image with touch

If there is no touch for 10 seconds, it will end.
I borrowed the icon from here.

How dose it works

https://www.sparkfun.com/datasheets/LCD/HOW%20DOES%20IT%20WORK.pdf

Application layer

Performance comparison using ILI9488(320x480)

I2S parallel is not always faster.
Depending on the application, REGISTER I/O parallel may be faster.
Compiling with the O2 option doesn't help much.
The unit of the number is the required time in milliseconds.
A smaller value indicates faster speed.

Test	GPIO parallel	REGISTER I/O parallel	I2S parallel	I2S parallel(O2)
AddressTest	820	280	40	30
FillTest	3900	2370	1620	1590
ColorBarTest	810	290	60	40
ArrowTest	860	300	160	140
LineTest	2060	860	3150	2900
CircleTest	1950	830	2840	2610
RoundRectTest	1970	820	2930	2690
RectAngleTest	2810	1340	5180	4880
TriangleTest	2960	1530	6090	5640
DirectionTest	900	330	250	230
HorizontalTest	1110	430	610	550
VerticalTest	1110	430	610	550
FillRectTest	1300	590	200	140
ColorTest	1660	650	220	180
BMPTest	7280	6500	6130	5790
JPEGTest	1210	490	170	140
PNGTest	1480	750	440	1010

Performance comparison using ILI9341(240x320)

SPI used this.

Test	SPI	GPIO parallel	REGISTER I/O parallel	I2S parallel
FillTest	1620	2700	1920	1560
ColorBarTest	80	410	150	30
ArrowTest	250	450	160	140
LineTest	2770	1030	430	1570
CircleTest	2470	970	410	1410
RoundRectTest	2510	970	400	1430
RectAngleTest	5990	2000	940	4050
TriangleTest	6950	2110	990	4740
DirectionTest	420	500	190	240
HorizontalTest	1030	710	290	590
VerticalTest	1010	710	290	590
FillRectTest	170	710	340	120
ColorTest	250	850	340	150
BMPTest	7470	6880	6360	6120
JPEGTest	2530	800	350	150
PNGTest	2800	1070	610	420

Reference about I2S driver

https://github.com/espressif/esp-iot-solution/tree/master/components/bus

for esp32
i2s_lcd_esp32_driver.c
for esp32s2
i2s_lcd_esp32s2_driver.c
for esp32s3
8080_lcd_esp32s3.c
Common header
i2s_lcd_driver.h

Name		Name	Last commit message	Last commit date
Latest commit History 237 Commits
components/tft_library		components/tft_library
font		font
icons		icons
images		images
lcd_id		lcd_id
main		main
4-line_resistance_touch_screen.txt		4-line_resistance_touch_screen.txt
CMakeLists.txt		CMakeLists.txt
LICENSE		LICENSE
README.md		README.md
partitions.csv		partitions.csv
sdkconfig.defaults		sdkconfig.defaults

License

nopnop2002/esp-idf-parallel-tft

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esp-idf-parallel-tft

Support driver

Generic Shield

OPEN-SMART Products

Software requirements

Installation

Configuration

Wireing

Graphic support

Fonts support

Image support

Using Wemos D1 ESP32

Using TZT D1 ESP32-S3

JPEG Decoder

PNG Decoder

Font File

Font File Editor(FONTX Editor)

Convert from BDF font to FONTX font

Convert from TTF font to FONTX font

4-line resistance touch screen

Configuration for touch screen

OPEN-SMART 16Pin-Parallel Products

OPEN-SMART TFT-Shield Products

ELEGOO TFT-Shield Products

ILI9341 2.4inch TFT-Shield with Yellow Pin-header

ILI9486 3.5inch TFT-Shield

Other TFT

Calibrating the touch screen

Draw with touch

Button with touch

Move with touch

Menu with Touch

Select image with touch

How dose it works

Application layer

Performance comparison using ILI9488(320x480)

Performance comparison using ILI9341(240x320)

Reference about I2S driver

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