from utils.constants import TOTAL_NUMBER_OF_CARS, GAMETICK_IN_MILLISECOND class ByteHelper: def __init__(self) -> None: self.number = 0 def set_number(self, int_value): self.number = int_value def set_number_from_byte(self, byte_value): self.number = int.from_bytes(byte_value, 'little') def get_bit(self, index): return ((self.number >> index & 1) != 0) def set_bit(self, index, bit_value): if bit_value == 1: self.number = self.number | (1 << index) elif bit_value == 0: self.number = self.number & ~(1 << index) else: raise ValueError("Invalid value, must be 0 or 1") def set_car_speed(self, value): # Car speed is represented by setting first 5 bits to value 0 -> 63 in one's complement if value > 63: # Doesn't fit in 4 bits return self.number = self.number ^ value def get_byte(self): return self.number.to_bytes(1, 'little') def get_int_ones_complement(self): return self.number ^ 0xFF @staticmethod def crc8(msg): CRC8_LOOK_UP_TABLE = [ 0x00, 0x07, 0x0e, 0x09, 0x1c, 0x1b, 0x12, 0x15, 0x38, 0x3f, 0x36, 0x31, 0x24, 0x23, 0x2a, 0x2d, 0x70, 0x77, 0x7E, 0x79, 0x6C, 0x6B, 0x62, 0x65, 0x48, 0x4F, 0x46, 0x41, 0x54, 0x53, 0x5A, 0x5D, 0xE0, 0xE7, 0xEE, 0xE9, 0xFC, 0xFB, 0xF2, 0xF5, 0xD8, 0xDF, 0xD6, 0xD1, 0xC4, 0xC3, 0xCA, 0xCD, 0x90, 0x97, 0x9E, 0x99, 0x8C, 0x8B, 0x82, 0x85, 0xA8, 0xAF, 0xA6, 0xA1, 0xB4, 0xB3, 0xBA, 0xBD, 0xC7, 0xC0, 0xC9, 0xCE, 0xDB, 0xDC, 0xD5, 0xD2, 0xFF, 0xF8, 0xF1, 0xF6, 0xE3, 0xE4, 0xED, 0xEA, 0xB7, 0xB0, 0xB9, 0xBE, 0xAB, 0xAC, 0xA5, 0xA2, 0x8F, 0x88, 0x81, 0x86, 0x93, 0x94, 0x9D, 0x9A, 0x27, 0x20, 0x29, 0x2E, 0x3B, 0x3C, 0x35, 0x32, 0x1F, 0x18, 0x11, 0x16, 0x03, 0x04, 0x0D, 0x0A, 0x57, 0x50, 0x59, 0x5E, 0x4B, 0x4C, 0x45, 0x42, 0x6F, 0x68, 0x61, 0x66, 0x73, 0x74, 0x7D, 0x7A, 0x89, 0x8E, 0x87, 0x80, 0x95, 0x92, 0x9B, 0x9C, 0xB1, 0xB6, 0xBF, 0xB8, 0xAD, 0xAA, 0xA3, 0xA4, 0xF9, 0xFE, 0xF7, 0xF0, 0xE5, 0xE2, 0xEB, 0xEC, 0xC1, 0xC6, 0xCF, 0xC8, 0xDD, 0xDA, 0xD3, 0xD4, 0x69, 0x6E, 0x67, 0x60, 0x75, 0x72, 0x7B, 0x7C, 0x51, 0x56, 0x5F, 0x58, 0x4D, 0x4A, 0x43, 0x44, 0x19, 0x1E, 0x17, 0x10, 0x05, 0x02, 0x0B, 0x0C, 0x21, 0x26, 0x2F, 0x28, 0x3D, 0x3A, 0x33, 0x34, 0x4E, 0x49, 0x40, 0x47, 0x52, 0x55, 0x5C, 0x5B, 0x76, 0x71, 0x78, 0x7F, 0x6A, 0x6D, 0x64, 0x63, 0x3E, 0x39, 0x30, 0x37, 0x22, 0x25, 0x2C, 0x2B, 0x06, 0x01, 0x08, 0x0F, 0x1A, 0x1D, 0x14, 0x13, 0xAE, 0xA9, 0xA0, 0xA7, 0xB2, 0xB5, 0xBC, 0xBB, 0x96, 0x91, 0x98, 0x9F, 0x8A, 0x8D, 0x84, 0x83, 0xDE, 0xD9, 0xD0, 0xD7, 0xC2, 0xC5, 0xCC, 0xCB, 0xE6, 0xE1, 0xE8, 0xEF, 0xFA, 0xFD, 0xF4, 0xF3 ] crc6Rx = CRC8_LOOK_UP_TABLE[msg[0]] for i in range(1, 8): crc6Rx = CRC8_LOOK_UP_TABLE[crc6Rx ^ msg[i]] return crc6Rx class ByteArrayHelper: def sending_array_of_ints_to_object(int_array): object_to_return = {} object_to_return["operation_mode"] = int_array[0] drive_packets = {} for i in range(1, 7): # Reverse ones complement car_int = int_array[i] ^ 0xFF # Take 1st -> 6th bit for speed car_speed = car_int & ~(1 << 7) car_speed = car_speed & ~(1 << 6) drive_packets[f"car_{i}"] = { "binary_string": format(car_int, '#010b'), "brakesOnReqsOnReq": car_int & 128 != 0, # Check 8th bit "laneChangeReq": car_int & 64 != 0, # Check 7th bit "power": car_speed } object_to_return["drive_packets"] = drive_packets object_to_return["led_status"] = int_array[7] object_to_return["checksum"] = int_array[8] return object_to_return def race_track_array_of_ints_to_object(int_array): object_to_return = {} byte_helper = ByteHelper() byte_helper.set_number(int_array[0]) object_to_return["handset_track_status"] = { "handset_6": byte_helper.get_bit(6), "handset_5": byte_helper.get_bit(5), "handset_4": byte_helper.get_bit(4), "handset_3": byte_helper.get_bit(3), "handset_2": byte_helper.get_bit(2), "handset_1": byte_helper.get_bit(1), "track_power_status": byte_helper.get_bit(0), "bit_7_should_be_true": byte_helper.get_bit(7) } for i in range(TOTAL_NUMBER_OF_CARS): car_int = int_array[1 + i] ^ 0xFF # Take 1st -> 6th bit for speed car_speed = car_int & ~(1 << 7) car_speed = car_speed & ~(1 << 6) object_to_return[f"handset_{i + 1}"] = { "brakesOnReq": car_int & 128 != 0, "laneChangeReq": car_int & 64 != 0, "power": car_speed } object_to_return["aux_port_current"] = int_array[7] car_id_lookup = { 0: "game_timer", 1: "car_1", 2: "car_2", 3: "car_3", 4: "car_4", 5: "car_5", 6: "car_6", 7: "invalid id" } byte_array_copy = int_array.copy() byte_helper.set_number(byte_array_copy[8]) # Check if we have first 5 bytes set by setting last 3 bits to zero and checking the total value is 248 byte_helper.set_bit(0, 0) byte_helper.set_bit(1, 0) byte_helper.set_bit(2, 0) prepended_1s = byte_helper.number object_to_return["car_id_track"] = { "constant_bits_should_be_248": prepended_1s, # CAR_ID_TRACK_STARTING = 248 # 11111000 "car_id": car_id_lookup[int_array[8] ^ 248] # Get last 3 bits of BYTE } nr_of_bytes_making_up_game_ticks = 4 game_time_ticks = 0 for i in range(0, nr_of_bytes_making_up_game_ticks): game_time_ticks += int_array[9 + i] << 8 * i object_to_return["game_timer_in_micro_seconds"] = game_time_ticks object_to_return["race_track_buttons_should_be_0"] = int_array[13] object_to_return["checksum"] = int_array[14] return object_to_return def generate_slot_cars_int_array_for_testing(car_id=0, game_time_in_ms=0, encode_to_byte_array=True): int_array = [] HANDSET_AND_TRACK_STATUS = 255 # IF TRACK ON AND ALL HANDSETS ON int_array.append(HANDSET_AND_TRACK_STATUS) int_array.extend([255, 255, 255, 255, 255, 255]) AUX_PORT_CURRENT = 24 int_array.append(AUX_PORT_CURRENT) CAR_ID_TRACK_STARTING = 248 # 11111000 car_update_value = CAR_ID_TRACK_STARTING ^ car_id int_array.append(car_update_value) game_time_ticks = int(game_time_in_ms / GAMETICK_IN_MILLISECOND) three_byte_array = game_time_ticks.to_bytes(4, 'little') for byte in three_byte_array: int_array.append(byte) # Add 15th bit: http://ssdc.jackaments.com/interface.shtml int_array.append(0) # No buttons pressed checksum = ByteHelper.crc8(int_array) int_array.append(checksum) if encode_to_byte_array: return bytes(str(int_array).encode('utf-8')) return int_array