[英]Converting PySerial Readline From String to Binary
I'm sending the bytestring 0x0F, 0x07, 0x55, 0x55, 0x55 from a PIC microcontroller.我正在从 PIC 微控制器发送字节串 0x0F、0x07、0x55、0x55、0x55。
Over the serial port with Python I am using the readlines() command in PySerial.通过带有 Python 的串行端口,我在 PySerial 中使用 readlines() 命令。 I receive:
我收到:
['\x0f\x07UUU']
This does indeed correspond to the bytestring I sent, but it is formatted using what looks like a strange combination of hexadecimal and ASCII characters.这确实与我发送的字节串相对应,但它是使用十六进制和 ASCII 字符的奇怪组合进行格式化的。 What would be a good way to format this back to 0x0F, 0x07, 0x55, 0x55, 0x55?
将其格式化回 0x0F、0x07、0x55、0x55、0x55 的好方法是什么?
In Python 2, a bytestring (str) is a string of 8-bit characters, so it will look like that.在 Python 2 中,字节串 (str) 是一个 8 位字符的字符串,所以它看起来像这样。 Use the "ord" function convert each character to an int:
使用 "ord" function 将每个字符转换为 int:
>>> [ord(c) for c in '\x0f\x07UUU']
[15, 7, 85, 85, 85]
Check out binascii.hexlify
.查看
binascii.hexlify
。 According to the descritption:根据描述:
Return the hexadecimal representation of the binary data.
返回二进制数据的十六进制表示。 Every byte of data is converted into the corresponding 2-digit hex representation.
每个数据字节都转换为相应的 2 位十六进制表示。 The resulting string is therefore twice as long as the length of data.
因此,生成的字符串是数据长度的两倍。
An example:一个例子:
>>> import binascii
>>> binascii.hexlify('\x0f\x07UUU')
'0f07555555'
For back to hex:回到十六进制:
>>> data = binascii.hexlify('\x0f\x07UUU')
>>> ['0x' + data[i:i+2] for i in range(0, len(data), 2)]
['0x0f', '0x07', '0x55', '0x55', '0x55']
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