117 lines
3.3 KiB
Python
117 lines
3.3 KiB
Python
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# -*- coding: UTF-8 -*-
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import serial
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import time
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import binascii
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# CRC16矩阵表;
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CRC_TABLE = [
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0x0000, 0x1021, 0x2042, 0x3063,
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0x4084, 0x50A5, 0x60C6, 0x70E7,
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0x8108, 0x9129, 0xA14A, 0xB16B,
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0xC18C, 0xD1AD, 0xE1CE, 0xF1EF ]
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# 计算CRC16值;
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def crc16(bys, bysLen):
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uwCRC, ucTemp = 0xFFFF, 0x00
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index = 0
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while index < bysLen:
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ucTemp = (uwCRC >> 0x0C) & 0xFF
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uwCRC <<= 4
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uwCRC ^= CRC_TABLE[ucTemp ^ ((bys[index]) >> 0x04)]
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uwCRC &= 0xFFFF
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ucTemp = (uwCRC >> 0x0C) & 0xFF
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uwCRC <<= 4
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uwCRC ^= CRC_TABLE[ucTemp ^ (bys[index] & 0x0F)]
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uwCRC &= 0xFFFF
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index += 1
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return uwCRC
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def convert_rgb16(rgb16_values):
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data = bytearray()
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for value in rgb16_values:
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high_byte = (value & 0xFF00) >> 8
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low_byte = value & 0x00FF
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data.append(high_byte)
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data.append(low_byte)
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return data
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class BaseSerial():
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def __init__(self):
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self.exception = None
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self.ser = serial.Serial()
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def open(self, port, baudrate=115200, bytesize=8, parity=serial.PARITY_NONE, stopbits=1, timeout=3,
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writeTimeout=3):
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if type(port) == type(0):
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self.ser.port = "COM" + str(port)
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else:
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self.ser.port = port
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# 波特率;
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self.ser.baudrate = baudrate
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# 数据位;
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self.ser.bytesize = bytesize
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# 校验码;
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self.ser.parity = parity # PARITY_NONE=0
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# 停止位;
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self.ser.stopbits = stopbits
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# 串口读超时值
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self.ser.timeout = timeout
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# 串口写超时值
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self.ser.write_timeout = writeTimeout
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try:
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self.ser.open()
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return self.ser.is_open
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except Exception as e:
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self.exception = e
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print('打开串口异常', str(e))
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return False
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def reOpen(self):
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self.exception = None
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self.ser.close()
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try:
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self.ser.open()
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return self.ser.is_open
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except Exception as e:
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self.exception = e
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return False
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def close(self):
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self.ser.close()
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def write(self, cmd: bytearray):
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try:
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self.exception = None
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writelen = self.ser.write(cmd)
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self.ser.flush()
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# print("writehex:" + str(binascii.b2a_hex(cmd)) + " writelen=" + str(writelen))
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return True if writelen == len(cmd) else False
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except Exception as e:
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self.exception = e
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print('写串口异常', str(e))
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return False
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def read(self, size=0):
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try:
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self.exception = None
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bys = self.ser.read(1)
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for i in range(0, 3):
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while self.ser.in_waiting > 0:
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d = self.ser.read(1)
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bys = bys + d
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time.sleep(0.01)
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if bys.__len__() < size:
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time.sleep(0.1)
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if self.ser.in_waiting > 0:
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d = self.ser.read(self.ser.in_waiting)
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bys = bys + d
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# print("readhex:" + str(binascii.hexlify(bys)) + " readlen=" + str(bys.__len__()))
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return bys
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except Exception as e:
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self.exception = e
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print('读串口异常', str(e))
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return None
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