Participate in the 2019 Shanghai Home Expo, you can see the current national evolutionary direction, traditional home appliance networkization, intelligent. The network is easy to understand, more is a WiFi module, can be interconnected with mobile phones, then remote control, this is a way of intelligent, then there is another way to intelligently? This program introduces another program, HMI, Human Machine Interface, HMI, Human Machine Interface, which can make traditional home appliances, that is, the high-resolution touch screen for small appliances.
Regular microwave, washing machine, rice cooker, most of which are physical buttons, then evolve into touch buttons, now see high-end appliances in the home appliance market, many touch display schemes. All kinds of products such as water purifiers, cloud refrigerators, Gree washing machines, including clouds, have a display touch screen.
The Large Big Ping Group's launch program is based on NXP I.MX RT1050 as the main control of the display touch screen. The GUI function is based on free GUI development tool EMWIN, simple, convenient, free. Cross-border MCU does not require power management chips on the power supply design, saving costs, supporting video playback soft decoding, using itself format TS, FFMEP to decode, then use JPEG2MOVIES to encode into EMF (EMWIN MOVIE FILE) format, use EMWIN Tools, AVI video formats can be done directly in JPEG2MOVies.
The program is mainly used in touch screen applications on various small household appliances: washing machine, rice cooker, water dispenser, coffee machine, etc.
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Hardware design
The main control uses NXP MCU I.MX RT1050, which allows customers to get the performance experience of MPU with MCU, with extremely high cost performance. The MX RT1050 has sufficient computational performance and flexible memory configuration. Its basic parameters are as follows:
Cortex-M7 kernel, 600M frequency
Internal Flash, 512KB SDRAM
Support LCD RGB888 interface, CSI interface
Support EMWIN and other GUI tools
PXP accelerator
Highest resolution 1366 * 768
Support Ethernet interface
Support Keil, IAR, McUExPRSSO development environment
Support Freertos, RT-Thread
Low success, cost-effective
The chip is high, the peripheral resources are rich, in addition to the HMI applications introduced in this program, such as motor control, telephone conference system, surround speakers, etc .;
The main block diagram is shown below:
Touch screen design
The touch screen used by the scenario is 4.3 inches of TFT, the pixel is 480 * 272, with the LED backlight and capacitive touchpad, the IC on the touchpad is Duntai FT36GQQ, the interface is an I2C interface.
Other circuit design
The SDRAM used in this scheme is Western W9825G6KH-5I, Flash is W25Q256JVEIQ, itself supports SPI Flash, Hyper Flash, consolidate according to application requirements and cost, and we have tested the following brand Flash, you can Normal use, in the selection assessment, you can also use it.
Hardware design considerations
1 Layout recommends the 4-layer board design of the development board
2 The power supply is recommended to keep the internal DC / D C current loop as small as possible to avoid EMI issues.
3 hyperthermia and line width design suggestions
For BGA regions:
The through hole type is 14 / 8mils, the width width is 4mils, the wiring spacing is 3.79mils.
For the default area (except BGA):
The through hole type is 18 / 8mils, the width is 5mils, and the line spacing is 7mils.
- preferred BGA power supply to decoupling design layout reference NXP development board
4 SDRAM interface (running frequency up to 166MHz) is one of the key interfaces of the chip route. The controlled impedance of single-ended traces must be 50Ω. Ideally, all signal routes to the same length as the EVK board.
Solution Schematic:
PCB LAYOUT:
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Software design
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GUI development tool installation
1 Download SDK, contain Demo with EMWIN GUI, you can perform a reference path:
2 procedure
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2. Precautions:
1 Select the SWD interface when using J-Link download, while you need to use the J-Link of the V9 version and above, and the J-Link software driver package needs to be over 6.24B.
2 Provide 64MBYTE HYPERFALSH, 8 mByte, 1 6MBYTE QSPIFALSH's burn album, you need to pay attention to change the RAM USE Size to 0x8000 when burning.
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3. Other additional instructions:
1 This program can be displayed in addition to some interface display, and the playback of small video, video play itself format TS, FFMEP is decoded, and then encoded as an EMF (EMWIN MOVIE FILE) format with JPEG2MOVIES, with EMWIN Belt The tool is the function of the EMWIN comes, and AVI can decode played directly in JPEG2MOVies.
2 In the case of SDRAM, the RGB888 and network ports cannot be used simultaneously, and the chip pin is multiplexed.
The actual rendering after burning DEMO:
1 As shown in the figure shows the display of the thermostat, display the temperature of the room, you can select the temperature adjustment by touch screen
2 play small video
You can play some similar boot screens, logo dynamic display
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Scene application map
Exhibition board photo
Solution block diagram
Core technology advantage
1. The program supports the resolution up to 1366 * 768,
2. Support small video playback, up to 512KB internal SDRAM
3. Exauga Flash, how much do you happen?
4. Free hardware reference design, software SDK, scheme related code
Program specifications
1. 4.7-inch capacitive touch screen, 480 * 272 resolution
2. Support to play small video (soft solution)
3. Emwin GUI development
4. Support for updating information through Ethernet port
5. 4 layers Layout
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