"At present, there is no doubt that arm cotex-m series processors dominate the 32-bit microcontroller market. On the one hand, more and more manufacturers join the arm camp, which makes arm build a strong and dynamic ecosystem; On the other hand, manufacturers joining the arm camp can focus on their own strengths and launch products to the market faster; Real mutual benefit.
The advantage of chip manufacturers using ARM processor core is that they don't have to worry about the development of the core architecture, or even avoid patent protection. As long as they can quickly develop mainstream processors according to their own advantages. This is true for large international manufacturers, Taiwan or domestic manufacturers. For example, Nuvoton of Taiwan is one of those who have a good understanding of the development trend of China's microcontroller market and fit in with the rooting and rise of China. Relying on geographical advantages, language advantages and price advantages, the sales volume of Xintang microcontroller products in China has caught up with international well-known semiconductor manufacturers, and its strength can not be underestimated. Today, aiban.com will introduce to you a new learning development kit based on arm cortex-m4 kernel launched by Xintang - nuedu-sdk-m451.
Xintang nuedu-sdk-m451 learning development kit
We can see a special logo like a bachelor's hat on the outer package and board of nuedu-sdk-m451 kit. It can be said that this is a very meaningful mark for Xintang, which not only means that it is just a learning development kit launched in cooperation with colleges and universities, but also the deeper significance is that the quality of Xintang microcontroller has been recognized by colleges and universities.
Xintang nuedu-sdk-m451 learning development kit
The entire nuedu-sdk-m451 learning development kit includes:
Nuedu-evb-m451 motherboard * 1
Nuedu-basic01 Application module * 1
Nu bridge * 1 (with DuPont line)
MINIUSB cable * 1, quick start document * 1, (you can also get a Learning CD of Xintang microcontroller)
Xintang nuedu-sdk-m451 learning development kit family photo
Nuedu-evb-m451 is a prototype design motherboard based on Xintang m453vg6ae (m453vg6ae Data Book) microcontroller, which is similar to the microcontroller prototype board launched by other manufacturers. All pins of MCU are led out to facilitate engineers' development and evaluation of MCU; Nuedu-basic01 is equivalent to an additional application module, which can assist the development of microcontroller, and can realize the functions of LED, segment nixie tube display, infrared reception, etc; Of course, the most special is the Nu bridge (ox bridge), which is a USB to serial port communication tool, light and compact, easy to carry, and suitable for USB to serial port communication of other boards.
It can be said that the biggest advantage of the whole nuedu-sdk-m451 suite is that it can learn, develop or debug the onboard microcontroller without purchasing other accessories, and is suitable for users at different "levels", which is convenient while reducing costs. Next, we will take a closer look at the functions of each part in the future.
Nuedu-evb-m451 motherboard
The design of nuedu-evb-m451 motherboard is similar to that of common development boards. It can also be divided into the main microcontroller m453vg6ae circuit part and nu link me debugger part. At the same time, the golden mean also brings some popular elements, integrating the pin arrangement base compatible with ardunio uno R3 expansion interface that the current boards are willing to carry, as shown in the figure below
Nuedu-evb-m451 motherboard front
Nuedu-evb-m451 motherboard back
Nuedu-evb-m451 signal interface definition
Nuedu-evb-m451 onboard resources:
M453vg6ae microcontroller, arm cortex-m4 core
Nulink me debugger
Arudino uno R3 extension interface
Reset button, LED indicator
5V DC jack interface, MINIUSB device interface (USB OTG function can be realized), nulink me MINIUSB interface
One of the biggest features of nuedu-evb-m451 motherboard is that the power supply is particularly flexible. We know that one of the "weapons" of Xintang microcontrollers is very powerful, that is, all its microcontrollers have a wide voltage working range of 2.5V ~ 5.5V. We can also detect this feature from the power supply circuit of this motherboard, The MINIUSB on the Nu link me debugging module will step down to 3.3V through an LDO to supply power to the microcontroller, while the MINIUSB device interface and DC jack interface on the motherboard directly supply 5V power to the microcontroller.
We often see that the development board can realize the separation of debugger and microcontroller board, but usually the main microcontroller does not do additional power supply interface design, which needs to be derived from the expansion interface. However, Xintang nuedu-evb-m451 motherboard has made a very kind design, even if the power supply interface on Nu link me debugging module is stripped, There are still two optional power supply modes on the motherboard.
Recommended development board
Nuvoton nano130 development kit, 32-bit Cortex-M0 kernel, numicro ™ Series MCU
Xintang microcontroller m453vg6ae
At present, Xintang microcontroller based on cortex-m4 core mainly has two series: m451 series and nuc400 series. M451 series includes m451m series compatible with m051 series, m451 basic series, m452 USB series and m453 can series, as shown in the figure below
M451 series products
The m453vg6ae adopted by nuedu-evb-m451 motherboard is the can series product with the most abundant functions in m451 series. Based on cortex-m4 processor, it has the maximum 72mhz dominant frequency and lqfp100 package, as shown in the following figure
System block diagram of microcontroller m453vg6ae
Microcontroller m453vg6ae features:
Arm cortex-m4 processor, with floating point arithmetic unit and DSP, with the maximum dominant frequency of 72mhz
Working voltage: 2.5V ~ 5.5V; Operating temperature: - 40 ℃ ~ 105 ℃
256Kb flash, 32KB SRAM, configurable DataFlash
12 bit ADC (up to 16 channels), 12 bit DAC
Timer, RTC, UART, SPI, I2C, I2S, USB OTG, can, PWM, analog comparator, etc
In the CD provided by Xintang, there is a Cortex-M0 / M4 microcontroller selection tool numicro selection table, which can find the microcontroller that meets the requirements according to the parameters such as flash size, SRAM size and peripheral resources, or find the corresponding functional features through the microcontroller model, such as the m453vg6ae, You can basically locate the product by directly entering m453 (as shown in the figure below), which is very easy to use and highly recommended.
NuMicro Selection Table
Through the detailed characteristics of m453vg6ae, we once again understand the powerful peripheral functions of this microcontroller. Moreover, m453vg6ae also has:
Wide working voltage (2.5V ~ 5.5V)
Industrial grade temperature (- 40 ℃ ~ 105 ℃)
Built in 22.1184MHz crystal oscillator (accuracy 1% at 25 ℃, 5V)
Configurable data flash
Strong anti-interference (ESD 8Kv, EFT 4KV)
These features will greatly ensure the normal operation of m453vg6ae in response to industrial automation, motor control and other harsh environments. In addition, m453vg6ae can play a role in PLCs, frequency converters, smart homes, security systems, data acquisition, USB applications, smart card readers and other fields.
M453vg6ae application field
Application extension module nuedu-basic01
After understanding the nuedu-evb-m451 motherboard, let's take a look at the nuedu-basic01 application expansion module, which is a very suitable expansion module for beginners and integrates rich basic functions, which can help engineers quickly understand the microcontroller, as shown in the figure below.
Nuedu-basic01 application extension module
Nuedu-basic01 application expansion module board resources:
Infrared receiver, infrared transmitter
Led * 8, mechanical key * 5, rgbled * 1
7-segment nixie tube display, adjustable resistor, buzzer
SPI Flash、EEPROM
SPI、I2C、UART
Signal pin seat consistent with nuedu-evb-m451 main board pin seat
Of course, since the nuedu-evb-m451 motherboard is compatible with the interface signal of Arduino uno R3, it can not only support the multi-functional J basic module provided by Xintang, but also be used with the expansion board of open source hardware Arduino. Free DIY is nothing.
Serial communication tool Nu Bridge
Nuedu-sdk-m451 learning development kit also has a very interesting thing - Nu bridge. Of course, it is interesting to refer to its name. Generally speaking, Niu bridge is a USB to serial communication tool, which is designed based on the microcontroller nuc123sd4an0 of Xintang USB series.
It can be seen from the disassembled internal structure that niuqiao provides a jump cap design with an output voltage of 5V or 3.3V, which can be adjusted according to the actual situation. For example, if the signal level of the development board used is 3.3V, the jumping cap must be closed at the output voltage of 3.3V to prevent burning the microcontroller.
USB to serial communication tool Nu Bridge
Nuedu-sdk-m451 use
If you are using Xintang's microcontroller product for the first time, you still need to make some preparations before powering up the nuedu-sdk-m451 suite for development and use:
Determine your own ide design tools. At present, Xintang microcontroller supports common ide tools such as KEIL, IAR, etc
Install the Nu link me debugging tool driver of the corresponding ide tool
Install the BSP of the corresponding board (which contains board routines and other resources, which are necessary for beginners)
If you want to use ox bridge as a serial communication tool, you should also install the driver file winusb4nuvcom.exe
In fact, these steps are described in the CD provided by Xintang. As long as you follow them, it's basically no difficulty. I won't repeat them one by one here
Nuedu-sdk-m451 suite learning and development process
After all preparations are ready, the nuedu-sdk-m451 kit can be officially powered on and developed. After power on, the board card will start the default factory program. The functions you can see include nixie tube reading display, running water lamp, rgbled lighting (adjusting brightness through adjustable rheostat), etc., as shown in the following figure
Nuedu-sdk-m451 kit runs the factory built-in program
If you want to compile and burn other programs, you can use ide tools. Take keil as an example to find the path of the previously installed BSP folder, which contains the routine resources of nuedu-sdk-m451 suite. In fact, the routines based on nuedu-basic01 application extension module are still very perfect, and independent routines with single functions can be learned, as shown in the figure below.
Nuedu-basic01 application extension module routine resources
On the nixie tube display, LED water lamp and other routines will not be demonstrated one by one. Let's take a look at smpl that cooperates with niuqiao tool to realize serial port output display_ Basic01_ UART_ Printf routine.
As shown in the following figure, first connect the serial port line of niuqiao with the board. Here is a point of comparison. The signals on the serial port line of niuqiao are marked with rx0, tx0, rx1 and TX1, while the serial port signals on the board are marked with rx0 and tx0, so people will subconsciously connect the rx0 and tx0 signals on niuqiao. In fact, we should connect the rx1 and TX1 signals on niuqiao. This should be noted.
Serial port cable connection
After the connection is completed, power on and load smpl in keil design software_ Basic01_ UART_ After the printf routine, you can click the main. C file to view the corresponding code. This is not only a simple serial port output program, but also a small program that enables the serial port to realize the corresponding cumulative cumulative subtraction count output while pressing the key to light the LED, as shown in the figure below
smpl_ Basic01_ UART_ Printf routine
Here, the output characters of the lower serial port are simply modified, compiled and downloaded. The board needs to run the new program through the reset button. At the same time, the corresponding serial port output information can be seen through the serial port tool putty, as shown in the figure below
Serial port printout
It can be said that in addition to the development value of the microcontroller itself, many of the playability of the nuedu-sdk-m451 suite lies in the expansion of application modules, while the nuedu-evb-m451 motherboard can be matched with the expansion modules with different functions of Xintang, and is more compatible with the expansion interface of Arduino uno R3 to realize the expansion of more functional applications, especially for beginners, This is definitely a rare embedded learning suite.
Summary
This paper introduces the features and usage of Xintang nuedu-sdk-m451 learning development kit. Whether it is the rich basic learning function of the extended application module or the scalability function of the motherboard, nuedu-sdk-m451 learning development kit has the characteristics of ease of use, low learning cost and data integrity, Whether you are a novice or a senior Daniel, you can find your own positioning from this development kit.
However, some deficiencies are hidden under the "perfect" appearance. For example, in the processing of development board, the resistance is skewed, which is more like manual welding in the later stage; The selection of electronic components, such as crystal oscillator, are large package and low-cost, which is quite cheap compared with the boards of front-line manufacturers, such as ATMEL. Of course, nine times out of ten of these aspects are due to cost considerations (especially when Xintang's development board is always free), but in the face of a group of competitors whose brand influence and technical strength are higher than their own, if they don't try their best, it's difficult to "grab food" from the first-line microcontroller manufacturers
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