如何使用 Python 将字节数组发送到串行端口？
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How can I send a byte array to a serial port using Python?
提问by W. Stine
I am working on an application which requires the sending of a byte array to a serial port, using the pyserial module. I have been successfully running code to do this in canopy:
我正在开发一个应用程序，它需要使用 pyserial 模块将字节数组发送到串行端口。我已经成功地运行代码来在 canopy 中做到这一点：
import serial
ser = serial.Serial('/dev/ttyACM0', 9600, serial.EIGHTBITS, serial.PARITY_NONE, serial.STOPBITS_ONE)
ser.write([4, 9, 62, 144, 56, 30, 147, 3, 210, 89, 111, 78, 184, 151, 17, 129])
Out[7]: 16
But when I run the same code in Spyder (both are running Python 2.7.6) I get an error message, as
但是当我在 Spyder 中运行相同的代码（两者都运行 Python 2.7.6）时，我收到一条错误消息，如
import serial
ser = serial.Serial('/dev/ttyACM0', 9600, serial.EIGHTBITS, serial.PARITY_NONE, serial.STOPBITS_ONE)
ser.write([4, 9, 62, 144, 56, 30, 147, 3, 210, 89, 111, 78, 184, 151, 17, 129])
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "/usr/lib/python2.7/dist-packages/serial/serialposix.py", line 475, in write
n = os.write(self.fd, d)
TypeError: must be string or buffer, not list
How can I make Spyder behave like Canopy in this regard?
在这方面，我怎样才能让 Spyder 表现得像 Canopy？
回答by Ignacio Vazquez-Abrams
By creating a bytearray(although you may need to convert to a stras well).
通过创建 a bytearray（尽管您可能也需要转换为 a str）。
>>> bytearray([1, 2, 3])
bytearray(b'\x01\x02\x03')
>>> str(bytearray([1, 2, 3]))
'\x01\x02\x03'
回答by Johan E. T.
It looks like the error is caused by the type of object passed to ser.write(). It seems that it is interpreted as a list and not a bytearray in Spyder.
看起来错误是由传递给 ser.write() 的对象类型引起的。似乎它被解释为列表而不是 Spyder 中的字节数组。
Try to declare the values explicitly as a bytearray and then write it to the serial port:
尝试将值显式声明为字节数组，然后将其写入串行端口：
import serial
ser = serial.Serial('/dev/ttyACM0', 9600, serial.EIGHTBITS, serial.PARITY_NONE, serial.STOPBITS_ONE)
values = bytearray([4, 9, 62, 144, 56, 30, 147, 3, 210, 89, 111, 78, 184, 151, 17, 129])
ser.write(values)
edit:Correcting typos.
编辑：更正错别字。
