Jane Medium ： This paper tests the results based on MM32F3277 Under the MicroPython Circuit board design . It includes SD Card interface , Common peripheral interfaces, etc . Verified the current transplant MicroPython The basic operation functions of files .

key word ： MM32F3277,MicroPython,SD card

 

§01 set up Background

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One 、MM32F3277 MicroPython

utilize MicroPython Developing embedded systems , It increases the flexibility of development at the expense of certain performance .MicroPython Explain the execution code , The hardware differences of the embedded bottom layer can be shielded .

stay Production test MM32F3277-MicroPython Minimum circuit board Designed based on MM32F3277 Of MicroPython It's a test board . From smart （MindMotion） Of MM32F3277 With rich resources . After testing two different MicroPython Migration version of , Can run well .

• Debugging comes from flying by flying MM32F3277 Transplantation has MicroPython Development board
• MM32F3277 MicroPython Experimental board design and software testing

The above two MicroPython Version of , All need the help of external SD Card to store the final execution MicroPython Program ：main.py. There is no external SD In the case of cards , They can only pass through REPL (Read Evaluate Print Loop) Debug the program . This article will be in MM32F3277 Experiment board Add... To that SD Card interface part .

Two 、SD Card interface

1、SD Card socket

according to pyBoard v1.1-CN STM32F405RG MCU development board MicroPython Programming Configuration on board , It has been used. MICRO SD cassette Mini short TF cassette Memory card slot with detection pin 8P high H2.6/3.0MM . This kind of SD The card pack is available in three sizes ：

• Short body H2.6MM Without detection foot ;
• Short body H3.0MM With detection feet ;
• Short body H3.75MM With detection feet ;

▲ chart 1.2.1 Short body H2.6MM Size of card holder

2、SD Card interface

according to OneOS（ From SeekFree） On the evaluation board SD Card interface design , To design based on MM32F3277 Of SD Card interface .

Because of the... On this motherboard SD The card is already The previous two versions MicroPython The verification obtained in .

▲ chart 1.2.2 SD Card interface definition

According to the definition of card slot above , You can know SD The pin definition sequence of the card is shown in the following figure ：

▲ chart 1.2.3 SD Pin sequence definition of card and card slot

according to MM32F3277 User's Manual Definition of pins in , You can see ,SD The interface of the card uses MCU Of SDIO（ Secure digital I / O interface ）, compatible SD/SDIO/MMC Device controller , As an external control SD/SDIO/MMC Cartoon letter interface .

▲ chart 1.2.4 MM32F3277 Port function definition

3、 ... and 、 establish AD Component library

According to the above SD Card slot data , stay AltumDesign Check the corresponding component library in . according to MICRO SD cassette Basic geometric parameters given on the web page , Design AD Component library in . The size of the fixed pad of the metal shell on both sides is unknown , Measure the specific size of each part through the picture .

1、 Device size

▲ chart 1.3.1 Measure the geometric position on the drawing

2、 Device packaging

PCB Package name ：SD-H26MM

▲ chart 1.3.2 Component packaging

3、 Device schematic diagram

Schematic device name ：MINI-SD

▲ chart 1.3.3 Schematic device definition

 

§02 set up Meter test

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One 、 Design circuit board

stay MM32F3277 MicroPython Experimental board design and software testing On the basis of , increase SD Card seat circuit , Design test circuit .

1、 Schematic diagram

▲ chart 2.1.1 The circuit principle diagram eee

2、 Fast plate making PCB

In order to fit A minute Plate making , The following designs are suitable for the production of single panel PCB.

▲ chart 2.1.2 Design fast plate making PCB

3、 Solder circuit board

Here is a one minute plate making , Solder to form a test circuit board .

▲ chart 2.1.3 After one minute plate making , Solder to form a test circuit board

Two 、 Test circuit board

1、 Power on test

exert +5V Work point , Measure the... On the circuit board 3.3V Regulated output 3.3V. The static power consumption is about ：6mA about .

2、 download MicroPython

Use MM32-LINK It will come from Su Yong MicroPython（2021-11-5 edition ） Download to MM32F3277 in .

▲ chart 2.2.1 download MicroPython The process

3、 test MicroPython Whether the work

（1） Test the crystal signal

From Su Yong MicroPython Use an external crystal clock , So it should be possible to measure on the external crystal 8MHz Crystal oscillation signal .

▲ chart 2.2.2 Oscillation signal on external crystal

（2） measurement REPL Power on serial port signal

because MicroPython After the start , Will be in REPL Port output version information , Therefore, it should be able to UART1 Of TX Measure the output signal .

▲ chart 2.2.3 After power on UART1 Of TX Measured output signal

（3） measurement REPL

Use STM32-Bootloader Connect to REPL port , test REPL Mutual operation .

▲ chart 2.2.4 stay STM32-BOOLOADER The received REPL Prompt

3、 ... and 、 test SD card

1、 Store and read files

stay SD Pre stored in the card “test1.py” text file . And then in MicroPython To read .

The following is Su Yong's demonstration of the sample process of reading and writing files .

▲ chart 2.3.1 Demonstration example program given by Su Yong

（1） The test program

from machine import Pin
import utime
with open('test.txt', 'w') as f:
f.write('Hello SD file.')
with open('test.txt', 'r') as f:
print(f.read())

（2） test result

Program download and execution process ,REPL The interface is as follows ：

Reset MicroPython...
Wait for MicroPython come back...
Download MicroPython : 24 lines/576 characters.
Begin to download program...
-------------------------------------------------------------------------
14
Hello SD file.
>>>

Write... Is shown above SD file： 14 Bytes , Corresponding test.txt The length is 14. Then read the content and display it .

（3） stay Windows The read SD card

Use SD Reader writer , You can see SD There are just MicroPython Written file .

▲ chart 2.3.2 Windows Check out SD What's inside the card

2、 Test other SD card

Use another one only 512MB Of SD card , Test in MicroPython Whether you can read the contents of the card .

▲ chart 2.3.3 Test one 512M Of SD card

Use the same procedure ,MicroPython Display the following information ：

Reset MicroPython...
Wait for MicroPython come back...
Download MicroPython : 24 lines/576 characters.
Begin to download program...
-------------------------------------------------------------------------
Traceback (most recent call last):
File "<stdin>", line 13, in <module>
OSError: 19
>>>

3、 write in main.py

stay SD Storage main.py,MicroPython After power on, first execute main.py Program .

Here is main.py The content of the test ：

from machine import Pin
import utime
for _ in range(10):
print(_)
utime.sleep_ms(100)

write in SD Kanazhong . take SD Card insertion test MicroPython Microplate ：

▲ chart 2.3.4 stay SD The card stores main.py

After power on , Program output ：

[Y] sdcard ready.
[Y] file system on sdcard ready.
[Y] run the main.py on disk ...
0
1
2
3
4
5
6
7
8
9
[Y] done. 1
MicroPython v1.16 on 2021-11-05; MB_F3270 with MM32F3277G7P
>>>

 

※ measuring Try to summarize ※

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Ben This paper tests the results based on MM32F3277 Under the MicroPython Circuit board design . It includes SD Card interface , Common peripheral interfaces, etc . Verified the current transplant MicroPython The basic operation functions of files .

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■ Links to related literature :

• Production test MM32F3277-MicroPython Minimum circuit board
• Debugging comes from flying by flying MM32F3277 Transplantation has MicroPython Development board
• MM32F3277 MicroPython Experimental board design and software testing
• REPL
• pyBoard v1.1-CN STM32F405RG MCU development board MicroPython Programming
• MICRO SD cassette Mini short TF cassette Memory card slot with detection pin 8P high H2.6/3.0MM
• MM32F3277 User's Manual
• utilize Python Simulate the mouse to complete automatically MM32-LINK Program download
• STM32-Bootloader

● Related chart Links :

• chart 1.2.1 Short body H2.6MM Size of card holder
• chart 1.2.2 SD Card interface definition
• chart 1.2.3 SD Pin sequence definition of card and card slot
• chart 1.2.4 MM32F3277 Port function definition
• chart 1.3.1 Measure the geometric position on the drawing
• chart 1.3.2 Component packaging
• chart 1.3.3 Schematic device definition
• chart 2.1.1 The circuit principle diagram
• chart 2.1.2 Design fast plate making PCB
• chart 2.1.3 After one minute plate making , Solder to form a test circuit board
• chart 2.2.1 download MicroPython The process
• chart 2.2.2 Oscillation signal on external crystal
• chart 2.2.3 After power on UART1 Of TX Measured output signal
• chart 2.2.4 stay STM32-BOOLOADER The received REPL Prompt
• chart 2.3.1 Demonstration example program given by Su Yong
• chart 2.3.2 Windows Check out SD What's inside the card
• chart 2.3.3 Test one 512M Of SD card
• chart 2.3.4 stay SD The card stores main.py

◎ The official account message ：

• Xiao Chen wants to get a master's degree ： Ask no questions , Smart cars this year 32 Are you going to omnidirectional beacon
  • author ： Let's wait until tomorrow's meeting . Now the preliminary plan , Smart 32 Not used in beacons .
• G·RID er·Skye. D ： How about the performance , What basically landed is still c and cpp Well , A little chicken ribs , But be an introduction , Or do an algorithm verification , If you pursue performance , Or write honestly c Well
• Poan ： I've seen Mr. Zhuo make plates in one minute , I still remember . It is suggested that Mr. Zhuo make a video about one minute plate making / article
• Yuanjie ：micropy It's really friendly for novices , Maybe it's a new creative direction , A sound platform is needed for the platform BSP Support , Otherwise, you need to connect yourself c-module 了 , It's not very friendly to novices .
• Hi ： In pursuit of performance, you should write assembly directly
• ： Today's game rules , Let's start the video game slowly
• MOS.2SC3306 ： In pursuit of performance, you should write machine code directly
• Power ： What kind of product to use mcro Python Development ？
  • author ： The competition system is made up of MicroPython Developed ： https://zhuoqing.blog.csdn.net/article/details/116399989
• To the drizzly evening rain ： So will there be rules tomorrow ？
• forward ： It is suggested to expand CH32V103 Application scope of
• Roll baked cakes, roll steamed bread, roll everything ： Zhuo Da Which will be used for wireless charging this year MCU ah
  • Roll baked cakes, roll steamed bread, roll everything ： And four wheelsets These two groups MCU Are you sure
• Thousands of handrails ：python Development is very good , But without the embedded soul ,python Language is also unfavorable to the cultivation of programming norms , If you want to stay in this business , I can't use it python
• Amateur ： Mr. Zhuo ,micropython and arduino What is the difference in development , Can you tell me something ？
  • author ： The main difference ：MicroPython Is an interpretation and execution language , There is no need to install special compilation environment and debugger during use , Only one serial port is needed for debugging , Debugging and development are very convenient , Relatively inefficient execution ;Arduino Is the compilation and execution language , During use, you need to install a special compilation environment and download ; Execution efficiency and C Language programming is the same .
• dust ： Will there be rules for the 17th session today
  • author ： The third meeting will be held tomorrow morning 17 Enlarged meeting of the Organizing Committee of the th smart car competition . One of the topics is to discuss and determine the rules of the game .
  • dust ： I still want to cooperate with more than four people
  • author ： well .
• GH ： Mr. Zhuo , When will the drone go out
  • author ： So far, there is no plan for unmanned aircrafts .
• Chen Shaochang ： Teacher Su Gongyu has been demonstrating , Today, I will learn more about Mr. Zhuo's official account. , Will also take my students about to do so . Development is becoming more and more convenient , I feel the progress of the times and the convenience of technology . Think back to the last century 80 In the s, compile the underlying program , Single task single environment , Not much memory is arranged by ourselves , a pile EPROM For debugging ,……, Professor Tong Shibai's inspirational class , Mr. Hu Dongcheng, who wears high myopia glasses, still remembers the first lesson of modeling electricity , be visible before the eyes ,… While lamenting the rapid development of technology , At the same time, I am constantly thinking , As a teacher of today's electronic technology course , What is unchangeable ？ What should I teach the children ？
• L Jianhao A kind of YH ： The next one will do this , I really want to play . use c No layman can understand the language , use python It can also be loaded, and the program is more flexible .
• Ye guanyong ： First , Bare chips generally refer to cut die, You are using finished plastic packaging devices , Will this title cause misunderstanding , And then this PCB The design is really unspeakable
• In the spring ： Zhuo dada , There will be three cars this year
  • author ： Right . The car model shall be self-made .
  • In the spring ： Can there be five people in those three cars
• HHW ： Zhuo dada , There's still omnidirectional this year
• West East . ：mp The development method is absolutely the most friendly . It can be developed quickly , You don't need to know the bottom . Debug is convenient . It can quickly realize project functions . Although some performance is sacrificed , But the benefits outweigh the losses . At present, the library file is not as good as arduino Sufficient , Hope is growing
• Mu Er Lei Zi ： Is Infineon still used for the fourth round this year
• Great Xia long ： The key to this thing is to have a library , Otherwise, you can't meet your special needs
• Red ： My personal feeling , There's no need to separate it now C Language and microPython Which is better or worse? , Both sides have their own strengths , It will take time to test who is the one with more great vitality . Like I prefer to explore the principle ,C Closer to the underlying logic , It's easy to use , But there are also some people who pay more attention to results , Hope to use mpy Quick start , It's OK, too . But to tell you the truth, , As long as the structure and principle of computer composition have not made a major breakthrough , I don't think a better packaged language can fundamentally change .
• Galaxy ： Zhuo Da , I'd like to ask one 12V When the power supply supplies power to a switching power supply chip and a motor drive chip at the same time , How to determine the input capacitance here , Because both chips said to add their own specified capacitance
• Boguan appointment ： It is suggested to expand CH32V103 Application scope of