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read_lidar.py
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read_lidar.py
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import serial
crc_table = [
0x00, 0x4d, 0x9a, 0xd7, 0x79, 0x34, 0xe3, 0xae, 0xf2, 0xbf, 0x68, 0x25,
0x8b, 0xc6, 0x11, 0x5c, 0xa9, 0xe4, 0x33, 0x7e, 0xd0, 0x9d, 0x4a, 0x07,
0x5b, 0x16, 0xc1, 0x8c, 0x22, 0x6f, 0xb8, 0xf5, 0x1f, 0x52, 0x85, 0xc8,
0x66, 0x2b, 0xfc, 0xb1, 0xed, 0xa0, 0x77, 0x3a, 0x94, 0xd9, 0x0e, 0x43,
0xb6, 0xfb, 0x2c, 0x61, 0xcf, 0x82, 0x55, 0x18, 0x44, 0x09, 0xde, 0x93,
0x3d, 0x70, 0xa7, 0xea, 0x3e, 0x73, 0xa4, 0xe9, 0x47, 0x0a, 0xdd, 0x90,
0xcc, 0x81, 0x56, 0x1b, 0xb5, 0xf8, 0x2f, 0x62, 0x97, 0xda, 0x0d, 0x40,
0xee, 0xa3, 0x74, 0x39, 0x65, 0x28, 0xff, 0xb2, 0x1c, 0x51, 0x86, 0xcb,
0x21, 0x6c, 0xbb, 0xf6, 0x58, 0x15, 0xc2, 0x8f, 0xd3, 0x9e, 0x49, 0x04,
0xaa, 0xe7, 0x30, 0x7d, 0x88, 0xc5, 0x12, 0x5f, 0xf1, 0xbc, 0x6b, 0x26,
0x7a, 0x37, 0xe0, 0xad, 0x03, 0x4e, 0x99, 0xd4, 0x7c, 0x31, 0xe6, 0xab,
0x05, 0x48, 0x9f, 0xd2, 0x8e, 0xc3, 0x14, 0x59, 0xf7, 0xba, 0x6d, 0x20,
0xd5, 0x98, 0x4f, 0x02, 0xac, 0xe1, 0x36, 0x7b, 0x27, 0x6a, 0xbd, 0xf0,
0x5e, 0x13, 0xc4, 0x89, 0x63, 0x2e, 0xf9, 0xb4, 0x1a, 0x57, 0x80, 0xcd,
0x91, 0xdc, 0x0b, 0x46, 0xe8, 0xa5, 0x72, 0x3f, 0xca, 0x87, 0x50, 0x1d,
0xb3, 0xfe, 0x29, 0x64, 0x38, 0x75, 0xa2, 0xef, 0x41, 0x0c, 0xdb, 0x96,
0x42, 0x0f, 0xd8, 0x95, 0x3b, 0x76, 0xa1, 0xec, 0xb0, 0xfd, 0x2a, 0x67,
0xc9, 0x84, 0x53, 0x1e, 0xeb, 0xa6, 0x71, 0x3c, 0x92, 0xdf, 0x08, 0x45,
0x19, 0x54, 0x83, 0xce, 0x60, 0x2d, 0xfa, 0xb7, 0x5d, 0x10, 0xc7, 0x8a,
0x24, 0x69, 0xbe, 0xf3, 0xaf, 0xe2, 0x35, 0x78, 0xd6, 0x9b, 0x4c, 0x01,
0xf4, 0xb9, 0x6e, 0x23, 0x8d, 0xc0, 0x17, 0x5a, 0x06, 0x4b, 0x9c, 0xd1,
0x7f, 0x32, 0xe5, 0xa8
]
with serial.Serial("/dev/ttyUSB0", 230400, timeout=1) as serial:
# Sync with header
while True:
b = serial.read(2)
if b[0] == 0x54 and b[1] == 0x2c:
serial.read(45)
b = serial.read(47)
if b[0] == 0x54 and b[1] == 0x2c:
break
while True:
b = serial.read(47)
#print("".join("{0:02x}".format(x) for x in b))
print("speed:", b[3] * 256 + b[2], end=", ")
print("start angle:", b[5] * 256 + b[4])
for i in range(12):
print("Distance:", b[1*3 + 7] * 256 + b[i*3 + 6], end=", ")
print("Intensity:", b[i*3 + 8])
print("end angle:", b[43] * 256 + b[42], end=", ")
print("timestamp:", b[45] * 256 + b[44], end=", ")
print("checksum:", b[46])
crc = 0
for i in range(46):
crc = crc_table[(crc ^ b[i]) & 0xff]
if crc != b[46]:
print("ERROR")
break