/
sainlogic_parser.py
84 lines (74 loc) · 2.91 KB
/
sainlogic_parser.py
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# Taken from https://reveng.sourceforge.io/crc-catalogue/1-15.htm#crc.cat.crc-8-nrsc-5
__CRC8_TAB = [
0, 0x31, 0x62, 0x53, 0xC4, 0xF5, 0xA6, 0x97, 0xB9,
0x88, 0xDB, 0xEA, 0x7D, 0x4C, 0x1F, 0x2E, 0x43, 0x72,
0x21, 0x10, 0x87, 0xB6, 0xE5, 0xD4, 0xFA, 0xCB, 0x98,
0xA9, 0x3E, 0xF, 0x5C, 0x6D, 0x86, 0xB7, 0xE4, 0xD5,
0x42, 0x73, 0x20, 0x11, 0x3F, 0xE, 0x5D, 0x6C, 0xFB,
0xCA, 0x99, 0xA8, 0xC5, 0xF4, 0xA7, 0x96, 1, 0x30,
0x63, 0x52, 0x7C, 0x4D, 0x1E, 0x2F, 0xB8, 0x89, 0xDA,
0xEB, 0x3D, 0xC, 0x5F, 0x6E, 0xF9, 0xC8, 0x9B, 0xAA,
0x84, 0xB5, 0xE6, 0xD7, 0x40, 0x71, 0x22, 0x13, 0x7E,
0x4F, 0x1C, 0x2D, 0xBA, 0x8B, 0xD8, 0xE9, 0xC7, 0xF6,
0xA5, 0x94, 3, 0x32, 0x61, 0x50, 0xBB, 0x8A, 0xD9,
0xE8, 0x7F, 0x4E, 0x1D, 0x2C, 2, 0x33, 0x60, 0x51,
0xC6, 0xF7, 0xA4, 0x95, 0xF8, 0xC9, 0x9A, 0xAB, 0x3C,
0xD, 0x5E, 0x6F, 0x41, 0x70, 0x23, 0x12, 0x85, 0xB4,
0xE7, 0xD6, 0x7A, 0x4B, 0x18, 0x29, 0xBE, 0x8F, 0xDC,
0xED, 0xC3, 0xF2, 0xA1, 0x90, 7, 0x36, 0x65, 0x54,
0x39, 8, 0x5B, 0x6A, 0xFD, 0xCC, 0x9F, 0xAE, 0x80,
0xB1, 0xE2, 0xD3, 0x44, 0x75, 0x26, 0x17, 0xFC, 0xCD,
0x9E, 0xAF, 0x38, 9, 0x5A, 0x6B, 0x45, 0x74, 0x27,
0x16, 0x81, 0xB0, 0xE3, 0xD2, 0xBF, 0x8E, 0xDD, 0xEC,
0x7B, 0x4A, 0x19, 0x28, 6, 0x37, 0x64, 0x55, 0xC2,
0xF3, 0xA0, 0x91, 0x47, 0x76, 0x25, 0x14, 0x83, 0xB2,
0xE1, 0xD0, 0xFE, 0xCF, 0x9C, 0xAD, 0x3A, 0xB, 0x58,
0x69, 4, 0x35, 0x66, 0x57, 0xC0, 0xF1, 0xA2, 0x93,
0xBD, 0x8C, 0xDF, 0xEE, 0x79, 0x48, 0x1B, 0x2A, 0xC1,
0xF0, 0xA3, 0x92, 5, 0x34, 0x67, 0x56, 0x78, 0x49,
0x1A, 0x2B, 0xBC, 0x8D, 0xDE, 0xEF, 0x82, 0xB3, 0xE0,
0xD1, 0x46, 0x77, 0x24, 0x15, 0x3B, 0xA, 0x59, 0x68,
0xFF, 0xCE, 0x9D, 0xAC
]
# CRC-8/NRSC-5 calculation
def __crc8(pkt):
crc = 0xFF
for val in pkt:
crc = __CRC8_TAB[crc ^ val]
return crc
# Check the 15 byte message bytes match the 1 byte CRC
def check_crc(msg):
return __crc8(msg[:-1]) == msg[-1]
# Get the wind direction in degrees
def get_direction(msg):
dir = msg[6]
if msg[3] & 0b100:
dir += 256
return dir
# Get the temperature in degrees F
def get_temperature(msg):
return ((msg[9] & 0b111) * 256 + msg[10]) / 10. - 40
# Get average wind speed in m/s
def get_avr_wind_speed(msg):
return msg[4] / 10.
# Get gust wind speed in m/s
def get_gust_wind_speed(msg):
return msg[5] / 10.
# Get rain measurement in mm
def get_rain(msg):
return (msg[7] * 256 + msg[8]) / 10.
# Get humidity in %
def get_humidity(msg):
return msg[11]
# Get Dictionary of measurements or None if decode failure
def get_measurements(msg):
if len(msg) != 16 or not check_crc(msg):
return None
return {
'temp': get_temperature(msg),
'humidity': get_humidity(msg),
'wind_dir': get_direction(msg),
'avr_wind': get_avr_wind_speed(msg),
'gust_wind': get_gust_wind_speed(msg),
'rain': get_rain(msg)
}