With the longitudinal development of the IoT applications such as wearable equipment, smart home, people hope that these products can also have intuitive graphical interaction interfaces like smartphones, which makes the manufacturer's performance displayed by microcontroller graphics. The higher. In response to this phenomenon, recently, the semiconductor has introduced a new series of STM32F469 / 479 microcontrollers, by integrating high-performance ARM Cortex-M4 processors, Chrom-Art Accelerator technology and has been widely used for smartphones and tablets MIPI-DSI technology, greatly enhances instant processing speed and graphic processing display performance, providing killer-level functions for those who need to implement a graphical interactive interface. This pavilion is also fortunate to experience the STM32F469 Discovery development board based on STM32F469 series MCU, let's see it.
STM32F469 Discovery Development Board
The STM32F469 also uses the STM32F series classic butterfly pack, but the difference is that the first eye is not just a simple development board, but a large black screen, there is a bit shaped beauty meaning, endure I can't help but admire.
After taking out the development board, you can look at the entire screen, 4-inch LCD display, and the same big screen with the iPhone5 of the year, is there a kind of sigh, the world is too fast, the development board is played. .
On both sides of the front screen of the development board, some LEDs and MEMS microphones, the back is the core device of the entire board, saying that this pattern adjustment and ST STM32F7 Discovery development board are very similar. Engineers who have used the ST Discovery development kit know that the ST exploration kit allows users to make users very convenient, quickly develop applications, and onboard hardware peripherals are basically used for better evaluation of microcontrollers, according to international Formulations, let's take a look at what resources are there in the STM32F469 Discovery board.
The specific resources are as follows:
STM32F469NIH6 microcontroller, BGA216 package
16MB SDRAM, 16MB SPI NOR FLASH
USB OTG FS
MicroSD card, I2C extension interface
SAI audio DAC, a stereo headphone output interface
3 MEMS Digital Microphones
SDRAM, four-channel SPI flash memory
4.0-inch color LCD-TFT with capacitive screen, resolution 800 * 480
4 LED indicators, user buttons, reset buttons
Arduino UNO expansion interface
Onboard ST-LINK / V2-1, an embedded debugger and programming STM32 microcontroller support MBED
No accident, STM32F469 Discovery also supports the MBED project, and it seems that the ST series development kit will "evolve" along this trend.
The hardware system block diagram of the STM32F469 Discovery board is as follows:
STM32 development board recommended:
STM32429i evaluation kit - Cortex-M4 kernel integrated ST-LINK / V2 provides an embedded debugger and programmer for STM32 microcontrollers.
STM32L1 Experiment Suite - Suite Based on the Cortex-M3 kernel by evaluation board and a STM32 single chip unit that is equipped with a set of UEXT / UXT.
STM32303E Development Board - Based on the ARM Cortex-M4 kernel is equipped with touch sensing, USB FS, JTAG debugging support, etc. for the development of user applications.
Let's see the core microcontroller STM32F469NIH6 on the next board. This is also the world's first MCU that integrates MIPI-DSI interface. It sounds quite "bluff" people, MIPI-DSI, mobile industry processor interface display standard specification This serial interface can connect the display by a small number of pins and enhance the supported display resolution. We can usually see in the online smartphone and the disassembly of the tablet. As for the microcontroller integrated MIPI interface, it is really unheard, it seems that STM32F469NiH6 will take the title of the world's first.
STM32F469NIH6 based on high performance ARM Cortex-M4 processor, integrated FPU unit and DSP, maximum frequency support 180MHz, internal integration 2MB flash, 384 KB SRAM large storage space, rich peripheral resources include SPI, FMC, Ethernet MAC, SDMMC, USB FS, camera interface, I2S and other interfaces can be referred to the following hardware system block diagram. (Click on the picture to enlarge)
Of course, the microcontroller is the most important thing to carry graphics processing, display resources, including:
Chrom-ART Accelerator
TFT LCD controller
MIPI-DSI interface
Chrom-art accelerator is a 2D direct memory access, which can achieve advanced graphics processing functions under very low CPU load conditions, can directly access, decode, and mix image data, and output directly to LCD liquid crystal displays. It can be said to have complement, and the STM32F469NIH6 is really quite, and the STM32F469NIH6 is really quite, and we will start the board. How is the actual effect.
Power-on start
STM32F469 Discovery provides three different power supply methods, which are MINIUSB, USB OTG, and Arduino extension interface power supply, and different power supply corresponds to different hop sections, as shown below.
We use the most commonly used ST-LINK V2-1 USB interface, plug in power, board run factory default RTOS system, 1.2 version, basic features include audio, video play, game, home monitoring.
In addition, there is also a particularly important feature Touch GFX, what is Touch GFX?
TouchGFX is a unique software framework that implements a graphical user interface (GUI) on smartphones on low-performance hardware, if you have the need to run the graphical user interface on the MCU, once you use Touch GFX Then I can't go back.
Click on Touch GFX, there are several function items, as shown below.
STM32 development board recommended:
STM32429i evaluation kit - Cortex-M4 kernel integrated ST-LINK / V2 provides an embedded debugger and programmer for STM32 microcontrollers.
STM32L1 Experiment Suite - Suite Based on the Cortex-M3 kernel by evaluation board and a STM32 single chip unit that is equipped with a set of UEXT / UXT.
STM32303E Development Board - Based on the ARM Cortex-M4 kernel is equipped with touch sensing, USB FS, JTAG debugging support, etc. for the development of user applications.
User controls Demo, including display functions such as calendar, sensors.
TouchGFX show Demo, including what is TouchGFX, etc.
Demo of the chart
In addition, TouchGFX has built a Bird Eat Coin game Demo.
Head play! ! !
This is a very intuitive game Demo that presents the Chrom-ART acceleration function. As shown in the figure below, we turn off the Chrom-ART acceleration function, the MCU's usage is about 75%.
When the Chrom-ART acceleration function is opened, the MCU's usage is left around 4%, and it feels more smooth when playing this game.
In addition, we also tested the power consumption when opening and closing Chrom-Art, connecting the multimeter to the current test jumper at the development board, as shown below. (The equipment is somewhat simple, the ordinary multimeter is used, it is inevitable to have an error, the test results are for reference)
The measured current is approximately 101.9 mA when the Chrom-ART acceleration function is turned off.
When the CHROM-ART acceleration function is turned, the measured current is approximately 97.0mA, and there is also a current between the two, and the CHROM-ART acceleration function is greatly reduced by the CHROM-ART acceleration function when processing complex graphics. It can be effectively reduced power consumption, very good.
From the demonstration of this TouchGFX function, whether it is an Internet of Things device, or most industrial applications, simple and intuitive touch type control is increasingly valued, but before this, the STM32F469 can be competent in complex graphics processing MCU It is not very common, and now we use the STM32F469 Discovery development board. It has brought a low cost, low-power graphic solution, is it great!
summary
Introduced the latest STM32F469 Discovery development board, the board is mounted on the core microcontroller STM32F469NIH6, based on a powerful low-power 32-bit ARM Cortex-M4 processor, supplemented by CHROM-ART acceleration and Art Accelerator Take acceleration technology, new products can improve graphical processing performance, instant processing speed, and the access speed of the kernel's program memory. By integrating accelerator and Mipi-DSI interface, STM32F469NIH6 can independently perform strict instant instant system control, monitoring and other application tasks, no need to be more powerful, more powerful processors, high energy consumption, high cost, low power consumption Graphical interaction interface features, this is undoubtedly an excellent reference design, and interested engineers can pay more attention to the fields of industry-connected, industrial field control.
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Original declaration: This article is originally created by the panel network, declined!
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