Nextion HMI LCD Touch Screen

1. The Nextion and TJC HMI Display Units
2. Specification
3. Nextion Editor on Linux
4. TJC4024T032_011
5. Chipsets
6. Chip Level Components by Stuart VK4MSL
7. Installing The TJC Editor and English language patch
8. Nextion Models
9. References

The Nextion and TJC HMI Display Units

Specification

Nextion is a seamless Human Machine Interface (HMI) solution that provides a control and visualization interface between a human and a process, machine, application or appliance. Nextion is mainly applied to Internet of thing (IoT) or consumer electronics field.

Nextion Editor on Linux

TJC4024T032_011

Chipsets

Chip Level Components by Stuart VK4MSL

Some of the parts identified:

3V 32M-Bit Serial Flash Memory with Dual/Quad SPI & QPI & DTR:
https://www.winbond.com/resource-files/w25q32jv%20dtr%20revf%2002242017.pdf?__locale=zh_TW

STM32F030C8 ACTIVE Education Save to myST Mainstream Arm Cortex-M0 Value line MCU with 64 Kbytes of Flash memory, 48 MHz CPU: https://www.st.com/en/microcontrollers-microprocessors/stm32f030c8.html

The 'C' indicates its one of the 48-pin parts and the 8 at the end tells us it has 64Kbytes of flash. (Page 89 of product specification.) - HR2046 looks to be one of many clones with *2046 part numbers including Texas Instruments/Burr Brown TSC2046 and the Shenzhen XPTEK XPT2046. - LCD display looks to be identical to the one used in this panel. http://www.digibay.in/3-2in-tft-lcd-board-240x320-w-sd-slot-touch-panel which suggests the actual display controller is a SSD1289.
240RGB x 320 TFT LCD Controller Driver Integrated Power Circuit, Gate and Source Driver with built-in RAM:
https://www.solomon-systech.com/en/product/display-ic/smart-tft-lcd-driver-controller/ssd1289/

[ Also see:
240x320 Touch Screen 3.2"TFT LCD Module Display Arduino Library:
https://www.buydisplay.com/3-2-inch-capacitive-touchscreen-240x320-tft-lcd-module-display and,

ER-TFTM032-3_Datasheet TFT LCD Module Display:
http://www.buydisplay.com/download/manual/ER-TFTM032-3_Datasheet.pdf ]

These are all relatively standard parts.

I'd suggest that ignoring Tao Jing Chi's firmware and porting GUISlice to this would be a very real possibility if using their native software proves to be difficult.

Both the touchscreen controller and the serial flash memory are SPI devices, theoretically they could be sharing a SPI bus… the STM32F030 has 6 USARTs (which support SPI as well as UART) and two dedicated SPI peripherals. Not all of those will be exposed on the 48-pin STM32F030C8 and not every pin can be used for SPI without having to bit-bang it.

There's no SDIO peripheral, so the probability is that the MicroSD card is being driven in SPI mode too: http://www.rjhcoding.com/avrc-sd-interface-1.php

It should be easy to discern whether these parts are sharing busses or not, just measure the resistance between the SCLK, MOSI/DI and MISO/DO pins of all parts, and see where those connect to the MCU.

The other things we'd want would be the locations on the PCB where these signals are exposed from the MCU:

• BOOT0 (pin 44): used to enable the ROM boot-loader on the STM32 for bootstrapping via USART0 using `stm32flash`
• SWCLK (pin 37) and SWDIO (pin 34): used for in-circuit debugging/flashing (SWD)
• nRST (pin 7): reset pin
• VDD (pins 1, 24, 48) and VSS (pins 23, 47): 3V3 power rails

Installing The TJC Editor and English language patch

NOTE: this is a Windows 10 application.

Nextion market two version on their product line. There are NX boards, for the world market outside China, and TJC boards for mainland China. The boards are essencial the same. The TJC boards are approximatly half the price of the NX boards. To protect the two tier market Nextion nly offer the TJC Editor in the Chinese language. The patch below defeats this market control mechanism by patching an older version on the Editor to English.

Save a run the Windows installation. Ignore the first screen, which is in Chinese, It is a prompt to upgrade to the latest versions. If this is done the patch will fail.

Download "patch.zip":
https://mega.nz/file/GHZSVYgQ#KzP6QR3YmaceXdkWYZpobBfJSYXSt0xCWmudGCCulj8

Close the editor of ot running, unzip the patch and copy the two files, HMIFORM.dll and hmitype.dll into the Windows folder "Program Files (x86)\USART HMI\" and start up the editor. Be sure not to select an update to a current version. The patch will apply automatically and the editor should display in English. Be aware that may of the links take you to Chinese language pages.

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Nextion Models

References