python的pyserial模块

发布时间：2020-08-14 14:10:17

来源：51CTO

阅读：2913

作者：小止1995

pyserial是python提供用于进行串口通信的库

源文档：https://pythonhosted.org/pyserial/

1、安装pyserial

pip install pyserial

2、查看电脑现连串口设备

import serial.tools.list_ports

#检测设备的端口数

# plist = list(serial.tools.list_ports.comports())

# if len(plist) <= 0:

# print("没有发现端口!")

# else:

# #端口数

# print len(plist)

# plist_0 = list(plist[1])

# serialName = plist_0[0]

# print serialName

# serialFd = serial.Serial(serialName, 9600, timeout=60)

# print(serialFd.name)

3、将要发送的数据进行转换

所发十六进制需转换为以下格式

# 所发十六进制字符串010591F50000F104

cmd = [0x01, 0x05, 0x91, 0xF5, 0x00, 0x00, 0xF1, 0x04]

# 转成16进制的函数

def convert_hex(string, strip_index_end=18):

result = []

for i in range(0, strip_index_end, 2):

hex_num = '0x' + string[i] + string[i+1]

result.append(eval(hex_num))

return result

4、进行串口通信

串口通信

Windows下端口为COM*, Ubuntu下为/dev/ttyS*

class Ser(object):

def __init__(self):

# 打开端口

self.port = serial.Serial(port=serialconf.SERIAL_NAME, baudrate=serialconf.SERIAL_PORT, timeout=serialconf.SERIAL_TIMEOUT)

# 发送指令的完整流程

def send_cmd(self, send_cmd):

send_cmd = self.convert_hex(send_cmd)

_LOG.debug("serial port send_command:[%s]" % repr(send_cmd))

self.port.write(send_cmd)

def recv_data(self, len=4):

response = self.port.read(6)

response = response.encode('hex')

return response

# 转成16进制的函数

def convert_hex(self, string, strip_index_end=18):

result = []

for i in range(0, strip_index_end, 2):

hex_num = '0x' + string[i] + string[i+1]

result.append(eval(hex_num))

return result

5、测试用例

my_ser = Ser()

print "send blink command"

my_ser.send_cmd(serialconf.BLINK_CMD)

ret = my_ser.recv_data()

print "send blink ret:%s %d" % (ret, ret.lower() == serialconf.BLINK_RET.lower())

6、接口、参数详细介绍

优秀博客：https://blog.csdn.net/u012611644/article/details/79125234