Best way to split a hexadecimal?<\/a><\/li>\n<\/ul>\nPython \u4f7f\u7528 list \u8cc7\u6599\u578b\u614b\u7a0b\u5f0f\u6703\u6bd4\u8f03\u9748\u6d3b\uff0c\u56e0\u6b64\u5be6\u52d9\u4e0a\u4f7f\u7528\u90fd\u662f\u76f4\u63a5\u4f7f\u7528 list<\/p>\n
from crcmod import *\r\n\r\n\r\ndef crc16_maxim(read):\r\n r = bytes(bytearray(read))\r\n crc16 = crcmod.mkCrcFun(0x18005, rev=True, initCrc=0xFFFF, xorOut=0x0000)\r\n crc_hex = hex(crc16(r))\r\n crc = divmod(int(crc_hex, 16), 0x100)\r\n return [crc[1], crc[0]]\r\n\r\n\r\nif __name__ == '__main__':\r\n r = [1, 3, 0, 0, 0, 2]\r\n rs_crc = crc16_maxim(r)\r\n full_rs = r + rs_crc\r\n print(full_rs) # [1, 3, 0, 0, 0, 2, 196, 11]\r\n<\/pre>\n--<\/p>\n
\u5b8c\u6574\u7684 Modbus \u7bc4\u4f8b<\/h2>\n
RS485 \u70ba\u534a\u96d9\u5de5\u901a\u8a0a\uff0c\u8b80\u53d6\u3001\u5beb\u5165\u5fc5\u9808\u81ea\u5df1\u6839\u64da\u5b57\u5143\u6578\u8a08\u7b97\u5f8c\u63a7\u5236\u6a21\u5f0f\uff0c\u6642\u5e8f\u63a7\u5236\u975e\u5e38\u91cd\u8981\uff0c\u4e0d\u80fd<\/strong>\u4f7f\u7528 .flush()\uff0c\u90a3\u662f\u5168\u96d9\u5de5\u7528\u7684\u529f\u80fd<\/p>\nfrom crcmod import *\r\n\r\nimport gpio\r\nimport serial\r\nimport time\r\n\r\nrs_control = 6\r\ngpio.setup(rs_control, 'out') # TR Pin\r\n\r\n\r\ndef crc16_maxim(read):\r\n r = bytes(bytearray(read))\r\n crc16 = crcmod.mkCrcFun(0x18005, rev=True, initCrc=0xFFFF, xorOut=0x0000)\r\n crc_hex = hex(crc16(r))\r\n crc = divmod(int(crc_hex, 16), 0x100)\r\n return [crc[1], crc[0]]\r\n\r\n\r\nif __name__ == '__main__':\r\n r = [31, 3, 0, 0, 0, 2]\r\n rs_crc = crc16_maxim(r)\r\n full_rs = r + rs_crc\r\n print(full_rs) # [31, 3, 0, 0, 0, 2, 199, 181]\r\n py_serial = serial.Serial(\"\/dev\/ttyS1\", baudrate=9600, timeout=0.5, writeTimeout=0.5, bytesize=8, parity='N', stopbits=1, rtscts=True, dsrdtr=True)\r\n read_count = full_rs[5] * 2 + 5 # \u8a08\u7b97\u63a5\u6536\u5b57\u6578\r\n gpio.set(rs_control, 1) # RS485 \u5207\u63db\u6210 out \u9001\u51fa\r\n py_serial.write(full_rs) # \u5beb\u5165\u8cc7\u6599\r\n # py_serial.flush() # flush() \u70ba\u5168\u96d9\u5de5\u4f7f\u7528\u529f\u80fd\uff0cRS485 \u4f7f\u7528\u6703\u6709\u592a\u665a\u5207\u63db\u6389\u8cc7\u6599\u554f\u984c\r\n time.sleep(0.001 * (len(full_rs))) # \u8a08\u7b97\u5beb\u5165\u7b49\u5f85\u6642\u9593 \u5b57\u6578*\u9b91\u7387\r\n gpio.set(rs_control, 0) # RS485 \u5207\u63db\u6210 in \u63a5\u6536\r\n read_data = b''\r\n while 1:\r\n r = py_serial.read()\r\n read_data += r\r\n if len(r) == 0:\r\n break\r\n else:\r\n py_serial.timeout = 0.001 * 10\r\n print(list(read_data)) # [31, 3, 4, 0, 25, 0, 25, 20, 63]\r\n<\/pre>\n--<\/p>\n
<\/div>\n