Jane Medium ： This paper gives a description of the data from FreeSeek The experimental board of is transformed to be able to adapt to SuYong Transplanted MicroPython The hardware interface of the development board . It mainly includes ： from NANO On the board SWD Interface download MicroPython Program ; On the base plate REPL Serial port out . however , The final version requires SuYong take REPL Readjust the port to A9,A10 Talent .

key word ：MicroPython,MM32, Test board preparation

§01MicroPython download

Download conditions

1、 Software source

This is a SuYong The compiled version sent through wechat , It is stored in the following directory of the development computer ：

D:\zhuoqing\DesignCenter\MM32\MicroPython\build-plus-f3270-20220429

2、 Download hardware

（1） Self made circuit board

Self made circuit is in the blog Design with SD Card MM32F3277 MicroPython Experiment board The experimental plate described in .

Download process , Note the following ：

• On the left is SWD Download port ; On the right is REPL;
• REPL： Connect ESP32 REPL Download the four leads in the middle of the board ;
• SWD Download Board , The top one is +5V;

In order to adapt to the new version MicroPython, Change the crystal to 12MHz.

After modifying the crystal , When powered on, you can STM32BL download 11500 The following is received at baud rate REPL Output information .

MicroPython v1.16 on 2022-04-29; PLUS-F3270 with MM32F3277G9P
Type "help()" for more information.
>>>

（2） Special experimental board

This experimental board comes from SeekFree Design and production of .

3、 stay Nano Download the program from the board

utilize Nano The download port on completes the programming of its software .

（1） Port modification

In the following order , Lower cover Header 5×2, formation PSWDI.

（2） download MicroPython

4、 extraction REPL Interface

Directly from MM32F3273 Of B6,B7 Up lead out REPL（UART1） Interface .

REPL Pin definition ：

PIN1：GND
PIN2：A10(RXD1)
PIN3：A9(TXD1)
PIN4：RST

After power on test , You can see REPL Information returned .

MicroPython v1.16 on 2022-04-29; PLUS-F3270 with MM32F3277G9P
Type "help()" for more information.
>>>

One 、 Test the test board

1、 Schematic diagram of experimental board

2、 Annex information

• NANO-F3270 V1.2.0
  

• PLUS_F3270 V1.2.0.0
  

※ total junction ※

Ben In this paper, the author gives a description of FreeSeek The experimental board of is transformed to be able to adapt to SuYong Transplanted MicroPython The hardware interface of the development board . It mainly includes ：

• from NANO On the board SWD Interface download MicroPython Program ;
• On the base plate REPL Serial port out .

be based on A9,A10 REPL edition

however , The final version requires SuYong take REPL Readjust the port to A9,A10 Talent .

• be based on A9,A10 REPL edition ：
  

• be based on B6,B7 REPL edition ：
  

Program download

■ Links to related literature :

• Design with SD Card MM32F3277 MicroPython Experiment board
• ESP32 REPL Download the four leads in the middle of the board ;

● Related chart Links :

• chart 1.1.1 Self made with SD card MM32F3277 MicroPython Experiment board
• chart 1.1.2 Download port
• chart 1.1.3 New version of the MicroPython The crystal needs to be replaced with 12MHz
• chart 1.1.4 Nano The appearance of the test board
• chart 1.1.5 Nano Schematic diagram
• chart 1.1.6 Nano Schematic diagram
• chart 1.1.7 CPU Pin definition
• chart 1.1.8 Nano Upper SWD Interface
• chart 1.1.9 Change the download port to PSWDI
• chart 1.1.10 Download terminal actually made
• chart 1.1.11 MM32-LINK download MicroPython
• chart 1.1.12 REPL Pin definition
• chart 1.1.13 From the external interface on the backplane REPL
• chart 1.1.14 From base plate REPL Lead out the corresponding pin
• chart 2.1 Configurable A9,A10