pyboard receives serial port data conversion problem

随风飞翔oO

pyboard receives serial port data conversion problem [Copy link]

 

Hello everyone! I recently encountered a problem, the problem of converting the data format received by the serial port: PuTTY received: b'\xaa\xd9\xfb\x9f\x9d\x9fYgcO}}\x9d\x93\x9f\x93\x9f\x93\x9f\x95\x8fW\x99\x00' What I actually sent was V4.0010SLNXAA160606058T3. I searched the Internet for a whole circle and was confused. How can this be converted to correctly display the data as V4.0010SLNXAA160606058T3?

dcexpert

It seems that the baud rate or serial port parameters are set incorrectly.

随风飞翔oO

dcexpert posted on 2021-7-18 18:12 It seems that the baud rate or serial port parameters are set incorrectly

Yes, 115200 baud rate, 8 bits. My application is to scan QR codes with a barcode gun. I have tried barcode gun scanning and USB to serial port sending with a serial port assistant. All of them received this data. I checked online and only knew that this example shows: It should be noted that when micropython reads data from the serial port, it returns bytes type data. It will convert some hexadecimal data into corresponding ascii characters. #That is to say, the data we actually receive in the program to open the button is like this, b'e\x00\x03\x01\xff\xff\xff'

随风飞翔oO

New progress: After adding a max232 chip, the conversion became normal. Could it be that the pyboard (STM32F405) can only receive TTL?

dcexpert

Flying with the wind oO Published on 2021-7-19 11:04 New progress: After adding a max232 chip, the conversion is normal. Can it be that the pyboard (STM32F405) can only receive TTL?

Ordinary microcontrollers can support receiving TTL signals, but RS232 needs to be converted.