通過帶有校驗和的串行端口發送十六進制數據

Question

我是python的新手，我正在嘗試編寫代碼以將十六進制串行數據發送到無線電並作為響應接收十六進制數據。 radio_init_buf變量存儲要發送的十六進制數據。 存儲校驗和的最后兩個字節。 radio_init_buf [3]告訴大小。

import sys
import glob
import numpy as np
import serial

class serial_communication():
  PORT = 'COM2'
  # RETURN_VALUE = None

def list_serial_ports(self):
    """ Lists serial port names

        :raises EnvironmentError:
            On unsupported or unknown platforms
        :returns:
            A list of the serial ports available on the system
    """
     if sys.platform.startswith('win'):
        ports = ['COM%s' % (i + 1) for i in range(0,10)]
    elif sys.platform.startswith('linux') or sys.platform.startswith('cygwin'):
        # this excludes your current terminal "/dev/tty"
        ports = glob.glob('/dev/tty[A-Za-z]*')
    elif sys.platform.startswith('darwin'):
        ports = glob.glob('/dev/tty.*')
    else:
        raise EnvironmentError('Unsupported platform')

    result = []
    for port in ports:
        try:
            s = serial.Serial(port)
            s.close()
            result.append(port)
        except (OSError, serial.SerialException):
            pass
    return result

def serial_open(self):
    self.ser = serial.Serial()
    self.ser.baudrate = 9600
    self.ser.port = sc.PORT
    self.ser.parity = serial.PARITY_NONE
    self.ser.stopbits = serial.STOPBITS_ONE
    self.ser.bytesize = serial.EIGHTBITS
    self.ser.writeTimeout = 1000
    self.ser.timeout = 1000
    try:
        self.ser.open()
        print("Port OPENED")
        self.initialize(self.ser)
    except Exception as e:
        print("error opening serial port: " + str(e))
        exit()
    return self.ser

def checksum(self, crc_packet, crc_packet_length):
    crc_table= np.array([0x0000, 0xC0C1, 0xC181, 0x0140, 0xC301, 0x03C0, 0x0280, 0xC241,
    0xC601, 0x06C0, 0x0780, 0xC741, 0x0500, 0xC5C1, 0xC481, 0x0440,
    0xCC01, 0x0CC0, 0x0D80, 0xCD41, 0x0F00, 0xCFC1, 0xCE81, 0x0E40,
    0x0A00, 0xCAC1, 0xCB81, 0x0B40, 0xC901, 0x09C0, 0x0880, 0xC841,
    0xD801, 0x18C0, 0x1980, 0xD941, 0x1B00, 0xDBC1, 0xDA81, 0x1A40,
    0x1E00, 0xDEC1, 0xDF81, 0x1F40, 0xDD01, 0x1DC0, 0x1C80, 0xDC41,
    0x1400, 0xD4C1, 0xD581, 0x1540, 0xD701, 0x17C0, 0x1680, 0xD641,
    0xD201, 0x12C0, 0x1380, 0xD341, 0x1100, 0xD1C1, 0xD081, 0x1040,
    0xF001, 0x30C0, 0x3180, 0xF141, 0x3300, 0xF3C1, 0xF281, 0x3240,
    0x3600, 0xF6C1, 0xF781, 0x3740, 0xF501, 0x35C0, 0x3480, 0xF441,
    0x3C00, 0xFCC1, 0xFD81, 0x3D40, 0xFF01, 0x3FC0, 0x3E80, 0xFE41,
    0xFA01, 0x3AC0, 0x3B80, 0xFB41, 0x3900, 0xF9C1, 0xF881, 0x3840,
    0x2800, 0xE8C1, 0xE981, 0x2940, 0xEB01, 0x2BC0, 0x2A80, 0xEA41,
    0xEE01, 0x2EC0, 0x2F80, 0xEF41, 0x2D00, 0xEDC1, 0xEC81, 0x2C40,
    0xE401, 0x24C0, 0x2580, 0xE541, 0x2700, 0xE7C1, 0xE681, 0x2640,
    0x2200, 0xE2C1, 0xE381, 0x2340, 0xE101, 0x21C0, 0x2080, 0xE041,
    0xA001, 0x60C0, 0x6180, 0xA141, 0x6300, 0xA3C1, 0xA281, 0x6240,
    0x6600, 0xA6C1, 0xA781, 0x6740, 0xA501, 0x65C0, 0x6480, 0xA441,
    0x6C00, 0xACC1, 0xAD81, 0x6D40, 0xAF01, 0x6FC0, 0x6E80, 0xAE41,
    0xAA01, 0x6AC0, 0x6B80, 0xAB41, 0x6900, 0xA9C1, 0xA881, 0x6840,
    0x7800, 0xB8C1, 0xB981, 0x7940, 0xBB01, 0x7BC0, 0x7A80, 0xBA41,
    0xBE01, 0x7EC0, 0x7F80, 0xBF41, 0x7D00, 0xBDC1, 0xBC81, 0x7C40,
    0xB401, 0x74C0, 0x7580, 0xB541, 0x7700, 0xB7C1, 0xB681, 0x7640,
    0x7200, 0xB2C1, 0xB381, 0x7340, 0xB101, 0x71C0, 0x7080, 0xB041,
    0x5000, 0x90C1, 0x9181, 0x5140, 0x9301, 0x53C0, 0x5280, 0x9241,
    0x9601, 0x56C0, 0x5780, 0x9741, 0x5500, 0x95C1, 0x9481, 0x5440,
    0x9C01, 0x5CC0, 0x5D80, 0x9D41, 0x5F00, 0x9FC1, 0x9E81, 0x5E40,
    0x5A00, 0x9AC1, 0x9B81, 0x5B40, 0x9901, 0x59C0, 0x5880, 0x9841,
    0x8801, 0x48C0, 0x4980, 0x8941, 0x4B00, 0x8BC1, 0x8A81, 0x4A40,
    0x4E00, 0x8EC1, 0x8F81, 0x4F40, 0x8D01, 0x4DC0, 0x4C80, 0x8C41,
    0x4400, 0x84C1, 0x8581, 0x4540, 0x8701, 0x47C0, 0x4680, 0x8641,
    0x8201, 0x42C0, 0x4380, 0x8341, 0x4100, 0x81C1, 0x8081, 0x4040],dtype=np.uint16)
    saved_crc_byte1 = crc_packet[crc_packet_length - 1]
    saved_crc_byte2 = crc_packet[crc_packet_length - 2]
    crc_packet[crc_packet_length - 1] = 0
    crc_packet[crc_packet_length - 2] = 0
    crc = 0
    for crc_loop in range(0,crc_packet_length):
        crc = (crc >> 8) ^ crc_table[(crc ^ crc_packet[crc_loop]) & 0xFF]


def initialize(self,serial_port):
    ser = serial_port
    if ser.isOpen():
        print("Initialising...")
        try:
            ser.flushInput()  # flush input buffer, discarding all its contents
            ser.flushOutput()  # flush output buffer, aborting current output
            # and discard all that is in buffer
            # write data
            #f = open('F:/output.txt', 'wb')
            radio_init_buf = np.array([0xAA, 0x00, 0x00, 0x08, 0x09, 0x32, 0x0, 0x0],dtype=np.uint8)
            #radio_init_buf="\xAA\x00\x00\x08\x09\x32\x00\x00"
            print(radio_init_buf)
            self.checksum(radio_init_buf,radio_init_buf[3])
            print(radio_init_buf)
            ser.write(radio_init_buf)

            serial.time.sleep(0.5)  # give the serial port sometime to receive the data
            #return_value = ser.read(7)
            print(return_value)

            print("Initialisation Complete")
            #comm Link Check
            print("Communication Link Checking..")
            comm_check_buf = np.array([0xAA, 0x06, 00, 6, 0x0B, 0x70],dtype=np.uint8)
            ser.write(comm_check_buf)
            print("Link Check Complete")

            #clear non-volatile memory
            clear_nvm_buf = np.array([0xAA, 0x82, 00, 7, 1, 0, 0],dtype=np.uint8)
            self.checksum(clear_nvm_buf, clear_nvm_buf[3])
            ser.write(clear_nvm_buf)


            #ser.close()

        except Exception as e1:
            print ("error communicating...: " + str(e1))
            ser.close()

    else:
        print("cannot open serial port ")

sc = serial_communication()
print(sc.list_serial_ports())
sc.serial_open()

當我運行代碼時，我得到：

['COM1', 'COM2', 'COM3']
Port OPENED
Initialising...
[170   0   0   8   9  50   0   0] 
[170   0   0   8   9  50   0   0]
b'\xaa\x90\x00\x12\x01\x0c\x00'
Initialisation Complete
Communication Link Checking..
Link Check Complete

而不是[170 0 0 8 9 9 0 0 0]，我需要十六進制數據。

另外，它不返回帶有校驗和的radio_init_buf。 調用校驗和后的結果相同。

Answer 1

以十六進制顯示：

for n in radio_init_buf:
    print("{:#x}".format(n), end='')
print()

{：#x}-格式字符串，＃：添加0x前綴，x：表示形式為十六進制，
一行：

print(("{:#x} "*len(radio_init_buf)).format(*radio_init_buf))

它創建一個長度為len（radio_init_buf）的字符串。 在* radio_init_buf中，“ *”解壓縮列表。