BBC micro:bit - Radio string transfer random carriage returns

问题:

I have two BBC Micro Bit and using Radio function to transfer data from one slave to the master Micro Bit. When the data is transferred I am getting random carriage returns, I am not sure what is the problem, I have tried to strip any random CR etc, but still getting the same problem.

a=1,On,

12

=2,

Off, 77

=3,

On, 88

===================================================

Gateway code

from microbit import * import radio  radio.config(group=0) radio.on()  while True:    incoming = radio.receive()    if incoming:       uart.write(incoming)   

==============================================

Slave code

from microbit import * import radio  radio.config(group=0) radio.on()  while True:   if button_a.was_pressed():       radio.send('Matt,A=On,Off' + '\n')  # a-ha       display.scroll("A")    if button_b.was_pressed():       radio.send('Matt,B=On,Off' + '\n')  # a-ha       display.scroll("B") 

=========================================================

PySerial code

import sys import glob   import serial   def serial_ports():     ports = ['COM%s' % (i + 1) for i in range(256)]  result = [] for port in ports:     try:         s = serial.Serial(port)         s.close()         result.append(port)     except (OSError, serial.SerialException):         pass return result   if __name__ == '__main__':   print(serial_ports()) try: ser = serial.Serial('COM5', 115200, timeout = 0) print("connected to: " + (ser.portstr)) except serial.SerialException: pass  while True: line = ser.readline().decode('utf-8') # Read a line and convert it from b'xxx\r\n' to xxx   if line:  # If it isn't a blank line     f = open('output.csv', 'a+')     f.write(line + '\n')     print(line)     f.close()  ser.close() 

回答1:

I found your scripts worked without sending extra carriage returns. I tested using two microbits. I used the REPL in mu and also CoolTerm, set to 115200 baud. I am using Linux Mint as my OS. CoolTerm output: Matt,B=On,Off Matt,A=On,Off

Added after the pyserial code was posted: The code below works for me to produce the expected output without extra blank lines. The newline is removed by using the end='' in the print statement. Finding the microbit using the pid and vid enables you to have other serial devices attached. Credit to microbit-playground for posting example code on how to use pid and vid to find the microbit.

I tested this on Linux using the jupyter notebook. It should work on Windows without modification.

import serial import serial.tools.list_ports as list_ports  def find_microbit_comport():     ports = list(list_ports.comports())     for p in ports:         if (p.pid == 516) and (p.vid == 3368):             return str(p.device)  if __name__ == '__main__':     ser = serial.Serial()     ser.baudrate = 115200     ser.port = find_microbit_comport()     ser.open()  while True:     line = ser.readline().decode('utf-8')     if line:  # If it isn't a blank line         f = open('output.csv', 'a+')         f.write(line)         print(line, end='')         f.close()  ser.close() 

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