96 lines
3.5 KiB
Python
96 lines
3.5 KiB
Python
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import serial
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import serial.tools.list_ports
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class SerialManager:
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def __init__(self, buffers):
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self.serials = {}
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self.buffers = buffers
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def open_port(self, port_name, baudrate=9600,bytesize = 8,parity = 'N',stopbits = 1,flowcontrol = 'None'):
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"""打开串口"""
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try:
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if port_name in self.serials and self.serials[port_name].is_open:
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print(f"串口 {port_name} 已经打开，正在关闭...")
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self.serials[port_name].close()
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ser = serial.Serial(port_name, baudrate, bytesize, parity, stopbits, flowcontrol)
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self.serials[port_name] = ser
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self.buffers[port_name] = b'' # 初始化缓冲区
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print(f"创建串口对象 {port_name} 成功，当前状态: is_open={ser.is_open}")
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return True
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except Exception as e:
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print(f"串口打开失败: {e}")
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return False
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def close_port(self, port_name):
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"""关闭串口"""
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try:
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if port_name in self.serials and self.serials[port_name].is_open:
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self.serials[port_name].close()
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del self.serials[port_name]
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del self.buffers[port_name]
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return True
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except Exception as e:
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print(f"串口关闭失败: {e}")
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return False
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def port_all_close(self):
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"""关闭所有串口"""
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for port_name in self.serials:
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self.serials[port_name].close()
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del self.buffers[port_name]
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self.serials = {}
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def reopen_port(self, port_name):
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"""重新打开串口"""
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try:
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if port_name in self.serials:
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self.serials[port_name].close()
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self.serials[port_name].open()
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return True
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else:
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print(f"串口 {port_name} 不存在或未打开")
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return False
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except Exception as e:
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print(f"串口重新打开失败: {e}")
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def read_data(self, port_name):
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"""读取串口数据"""
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try:
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ser = self.serials[port_name]
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num = ser.in_waiting
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if num > 0:
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data = ser.read(num)
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if port_name not in self.buffers:
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self.buffers[port_name] = b'' # 初始化为空字
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self.buffers[port_name] += data
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# 设置 buffer 的最大大小（元素数量）
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max_buffer_length = 256 # 根据需要调整最大长度
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# 计算当前 buffer 的总长度
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current_length = len(self.buffers[port_name])
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# 检查并限制 buffer 的长度
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if current_length > max_buffer_length:
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# 移除最早添加的字节，直到总长度不超过 max_buffer_length
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while current_length > max_buffer_length and self.buffers[port_name]:
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removed_byte = self.buffers[port_name][0:1]
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self.buffers[port_name] = self.buffers[port_name][1:]
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current_length -= len(removed_byte)
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return data
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except Exception as e:
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print(f"读取串口数据失败: {e}")
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return False
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def write_data(self, port_name, data):
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"""向串口发送数据"""
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try:
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ser = self.serials[port_name]
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ser.write(data)
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return True
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except Exception as e:
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print(f"写入串口数据失败: {e}")
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return False
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