wwj718/问题.md

## 问题.md

      
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              问题.md
            
          
    import serial, json, time
from serial.tools.list_ports import comports as list_serial_ports

def find_microbit():
    """
    Finds the port to which the device is connected.
    https://github.com/mu-editor/mu/blob/803153f661097260206ed2b7cc9a1e71b564d7c3/mu/contrib/microfs.py#L44
    """
    ports = list_serial_ports()
    for port in ports:
        if "VID:PID=0D28:0204" in port[2].upper():
            return port[0]
    return None


port = find_microbit()
baudrate=115200
ser = serial.Serial(port, baudrate, timeout=1)

i = 0
while True:
    data = {"a":i}
    # data = "topic-sensor-data-x" + "\r\n"
    data = json.dumps(data) + "\r\n"
    # data = "a" + "\r\n"
    data_bytes = data.encode("utf-8")
    ser.write(data_bytes)
    time.sleep(0.1)
    read_data = ser.readline()
    print("from microbit: {}".format(read_data))
    i += 1

microbit
from microbit import *

def get_topic_and_data(b):
    try:
        b = b.strip()
        json_str = str(b, 'utf-8')
        json = eval(json_str)
        display.show(str(json["a"])[-1])
        return "a"
    except:
        display.show(str("!"))


while True:
    r = uart.readline()  # is bytes or none
    if r:
        d = get_topic_and_data(r)
        if d:
            # uart.write(b'ok' + b"\r\n")
            uart.write(r)