microbit serial input/output

microbit_serial.py

'''
pc 控制microbit 
双工通道 编程风格类似socket
'''
## pc
import serial
ser = serial.Serial('/dev/tty.usbmodem1412', 9600, timeout=5)
data = "abc".encode("utf-8")
# data = bytes('abc\n',"UTF-8")
ser.write(data)


## microbit
from microbit import *
uart.init(9600)
while True:
    _data = uart.readline()
    if _data:
        data = str(_data,'utf-8') # bytes,_data.decode("utf-8")不可用
        display.scroll(data)
        # print(data)
    sleep(20)
    
    
############

'''
pc中读取microbit输出
'''

## microbit


import microbit
while True:
    microbit.sleep(1)
    print("hello")


## pc


import serial
ser = serial.Serial('/dev/tty.usbmodem1412', 115200, timeout=5)
data = ser.readline()
print(data)
line = str(data,'utf-8').strip() 
# data.decode("utf-8")

'''
问题: 如何输出数值组？
序列化还原
>>> a = [34, 58, 62]
>>> b = ",".join([str(i) for i in a]) # 将数字列表转化为字符串列表,这样利于传输

>>> [int(i) for i in b.split(",")] #将字符串列表还原为数字
[34, 58, 62]
'''

或者使用json
eval都行，eval注意注意安全问题

microbit:

    try:
        # json_str = str(b, 'utf-8')
        json = eval(b)
        # print(type(json))
        # print(json)
        display.scroll(str(json["topic"]), wait=True, loop=False)
    except:
        display.scroll(b"!")

外部

data = '{"topic": "sensor", "data": ""}'
data_bytes = data.encode("utf-8")
self.ser.write(data_bytes)