167 lines
6.9 KiB
Python
167 lines
6.9 KiB
Python
from ..message_base import MessageBase
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from ..constants import (
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Subaddress, BullsEyeSelect, WaypointType, WaypointQualifier,
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InterceptMode, LineStyle, SymbolState, Identity
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)
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from ..fields import BitField, EnumField, ScaledField, ASCIIField
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class MsgA3(MessageBase):
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"""
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Message A3: Graphic Settings
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ID: A3
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Direction: BC -> RT (Receive)
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Subaddress: 03
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Rate: 6.25 Hz
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Document Ref: 7.1.3
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"""
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SUBADDRESS = Subaddress.RX_GRAPHIC
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IS_TRANSMIT = False
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# --- Word 01: Graphic Order (Ref 7.1.3.1) ---
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# Graphic Symbols Enable Flags (1=Display)
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show_waypoint_1 = BitField(word_index=0, start_bit=0, width=1)
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show_waypoint_2 = BitField(word_index=0, start_bit=1, width=1)
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show_waypoint_3 = BitField(word_index=0, start_bit=2, width=1)
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show_intercept_fd = BitField(word_index=0, start_bit=3, width=1)
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show_break_away_cue = BitField(word_index=0, start_bit=4, width=1)
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show_intercept_zones = BitField(word_index=0, start_bit=5, width=1)
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show_ttg_cursor = BitField(word_index=0, start_bit=6, width=1)
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show_asec_circle = BitField(word_index=0, start_bit=7, width=1)
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show_attack_steering = BitField(word_index=0, start_bit=8, width=1)
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# Bull's Eye Selection
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bullseye_select = EnumField(word_index=0, start_bit=9, width=2, enum_cls=BullsEyeSelect)
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# Bits 11-15 Spare
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# --- Word 02: Time-to-Go to Cursor (Ref 7.1.3.2) ---
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# LSB = 1 sec
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ttg_cursor = ScaledField(word_index=1, start_bit=0, width=16, lsb_value=1.0)
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# --- Helper function for 25-bit Semicircles (Lat/Lon) ---
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def _get_25bit_semicircle(self, word_idx_msw, word_idx_lsw):
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"""
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Combines MSW (16 bit) and LSW (9 bit) to form a 25-bit 2's complement
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Semicircle value. LSB = 5.96046e-8.
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"""
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msw = self._data[word_idx_msw]
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# LSW uses only bits 0-8 (9 bits)
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lsw = (self._data[word_idx_lsw] >> 7) & 0x1FF
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# Combine: MSW is top 16 bits, LSW is bottom 9 bits
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raw_25 = (msw << 9) | lsw
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# Handle 2's complement for 25 bits
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if raw_25 & (1 << 24): # Sign bit check
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raw_25 -= (1 << 25)
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# Scale (1.0 full scale / 2^24) approx 5.96046e-8
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return float(raw_25 * 5.9604644775e-8)
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# --- Waypoint 1 Data (Ref 7.1.3.3 - 7.1.3.4) ---
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# Raw accessors for internal use if needed, but properties are preferred
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_wp1_lat_msw = BitField(word_index=2, start_bit=0, width=16)
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_wp1_lat_lsw = BitField(word_index=3, start_bit=0, width=9) # Bits 0-8
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@property
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def wp1_latitude(self):
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return self._get_25bit_semicircle(2, 3)
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wp1_type = EnumField(word_index=3, start_bit=9, width=1, enum_cls=WaypointType)
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wp1_qualifier_valid = BitField(word_index=3, start_bit=10, width=1)
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wp1_qualifier_val = EnumField(word_index=3, start_bit=11, width=2, enum_cls=WaypointQualifier)
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# WP1 Longitude
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@property
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def wp1_longitude(self):
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return self._get_25bit_semicircle(4, 5)
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wp1_code = BitField(word_index=5, start_bit=9, width=7) # 0-99
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# --- Waypoint 2 Data (Ref 7.1.3.5 - 7.1.3.6) ---
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@property
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def wp2_latitude(self):
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return self._get_25bit_semicircle(6, 7)
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wp2_type = EnumField(word_index=7, start_bit=9, width=1, enum_cls=WaypointType)
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wp2_qualifier_valid = BitField(word_index=7, start_bit=10, width=1)
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wp2_qualifier_val = EnumField(word_index=7, start_bit=11, width=2, enum_cls=WaypointQualifier)
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@property
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def wp2_longitude(self):
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return self._get_25bit_semicircle(8, 9)
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wp2_code = BitField(word_index=9, start_bit=9, width=7)
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# --- Waypoint 3 Data (Ref 7.1.3.7 - 7.1.3.8) ---
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@property
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def wp3_latitude(self):
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return self._get_25bit_semicircle(10, 11)
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wp3_type = EnumField(word_index=11, start_bit=9, width=1, enum_cls=WaypointType)
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wp3_qualifier_valid = BitField(word_index=11, start_bit=10, width=1)
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wp3_qualifier_val = EnumField(word_index=11, start_bit=11, width=2, enum_cls=WaypointQualifier)
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@property
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def wp3_longitude(self):
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return self._get_25bit_semicircle(12, 13)
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wp3_code = BitField(word_index=13, start_bit=9, width=7)
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# --- Intercept Flight Director (Ref 7.1.3.9 - 7.1.3.10) ---
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ifd_x = BitField(word_index=14, start_bit=0, width=9) # Pixels
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ifd_mode = EnumField(word_index=14, start_bit=10, width=1, enum_cls=InterceptMode)
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ifd_style = EnumField(word_index=14, start_bit=11, width=1, enum_cls=LineStyle)
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ifd_y = BitField(word_index=15, start_bit=0, width=9) # Pixels
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# --- Intercept Zones (Ref 7.1.3.11 - 7.1.3.14) ---
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int_zone_rmin_y = BitField(word_index=16, start_bit=0, width=9)
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int_zone_rmax_y = BitField(word_index=17, start_bit=0, width=9)
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no_escape_rmax_y = BitField(word_index=18, start_bit=0, width=9)
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int_zone_target_tip_y = BitField(word_index=19, start_bit=0, width=9)
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# --- ASEC (Ref 7.1.3.15) ---
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asec_radius = BitField(word_index=20, start_bit=0, width=9)
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asec_blink = EnumField(word_index=20, start_bit=9, width=1, enum_cls=SymbolState)
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# --- Attack Steering Cue (Ref 7.1.3.16 - 7.1.3.17) ---
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asc_x = BitField(word_index=21, start_bit=0, width=9)
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asc_blink = EnumField(word_index=21, start_bit=10, width=1, enum_cls=SymbolState)
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asc_y = BitField(word_index=22, start_bit=0, width=9)
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# --- Tracked Target Info (Ref 7.1.3.18) ---
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hpt_in_int_zone = BitField(word_index=23, start_bit=0, width=1)
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hpt_datalink_corr = BitField(word_index=23, start_bit=1, width=1)
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hpt_identity = EnumField(word_index=23, start_bit=2, width=1, enum_cls=Identity)
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spt_in_int_zone = BitField(word_index=23, start_bit=3, width=1)
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spt_datalink_corr = BitField(word_index=23, start_bit=4, width=1)
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spt_identity = EnumField(word_index=23, start_bit=5, width=1, enum_cls=Identity)
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# TWS Targets in Zone (Bits 6-13)
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tws_tgt_1_in_zone = BitField(word_index=23, start_bit=6, width=1)
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tws_tgt_2_in_zone = BitField(word_index=23, start_bit=7, width=1)
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# ... bits 8-13 follow same logic for targets 3-8
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# --- Call Signs (Ref 7.1.3.19 - 7.1.3.20) ---
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hpt_callsign_ab = ASCIIField(word_index=24) # Chars 1 & 2
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hpt_callsign_cd = ASCIIField(word_index=25) # Chars 3 & 4
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spt_callsign_ab = ASCIIField(word_index=26)
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spt_callsign_cd = ASCIIField(word_index=27)
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# --- Track IDs (Ref 7.1.3.21 - 7.1.3.24) ---
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# These are 8-bit IDs. We use BitField manually.
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tws_id_01 = BitField(word_index=28, start_bit=0, width=8)
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tws_id_02 = BitField(word_index=28, start_bit=8, width=8)
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tws_id_03 = BitField(word_index=29, start_bit=0, width=8)
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tws_id_04 = BitField(word_index=29, start_bit=8, width=8)
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tws_id_05 = BitField(word_index=30, start_bit=0, width=8)
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tws_id_06 = BitField(word_index=30, start_bit=8, width=8)
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tws_id_07 = BitField(word_index=31, start_bit=0, width=8)
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tws_id_08 = BitField(word_index=31, start_bit=8, width=8) |