Ryan Malloy
1464fcabe6
Split the monolithic IbusEsp32 class into composable layers: - KLineTransport: UART, GPIO ISR, ring buffers, idle detection - IbusHandler: BMW I/K-Bus FSM, source filtering, packet callback - IbusEsp32: thin facade preserving the original API Library renamed from IbusEsp32 to AutoWire. Existing sniffer sketch (main.cpp) requires zero changes. All 3 ESP32 environments build cleanly (esp32dev, esp32-c3, esp32-s3).
61 lines
1.4 KiB
C
61 lines
1.4 KiB
C
#pragma once
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// BMW I/K-Bus interface configuration
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// All values can be overridden via platformio.ini build_flags (-D flags)
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// --- UART pin assignments ---
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#ifndef IBUS_RX_PIN
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#define IBUS_RX_PIN 16
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#endif
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#ifndef IBUS_TX_PIN
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#define IBUS_TX_PIN 17
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#endif
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#ifndef IBUS_LED_PIN
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#define IBUS_LED_PIN 2
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#endif
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#ifndef IBUS_UART_NUM
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#define IBUS_UART_NUM 1
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#endif
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// --- Protocol timing ---
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// Bus must be quiet for this long before we can transmit (microseconds)
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#ifndef IBUS_IDLE_TIMEOUT_US
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#define IBUS_IDLE_TIMEOUT_US 1500
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#endif
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// Minimum gap between our own transmitted packets (milliseconds)
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#ifndef IBUS_PACKET_GAP_MS
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#define IBUS_PACKET_GAP_MS 10
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#endif
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// Periodic timer resolution for idle detection (microseconds)
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// Smaller = more responsive but more CPU overhead. 250us gives
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// worst-case detection at idle_timeout + 250us = 1.75ms, well
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// within the ~10ms inter-packet budget on a busy bus.
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#ifndef IBUS_IDLE_CHECK_US
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#define IBUS_IDLE_CHECK_US 250
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#endif
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// --- Buffer sizes ---
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#ifndef IBUS_RX_BUFFER_SIZE
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#define IBUS_RX_BUFFER_SIZE 256
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#endif
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#ifndef IBUS_TX_BUFFER_SIZE
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#define IBUS_TX_BUFFER_SIZE 128
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#endif
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// --- Protocol constants ---
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#define IBUS_BAUD 9600
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#define IBUS_FRAMING SERIAL_8E1
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// Message length byte must be between these values (inclusive)
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#define IBUS_MIN_LENGTH 0x03
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#define IBUS_MAX_LENGTH 0x24
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// Maximum raw message size (source + length + up to 36 body bytes)
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#define IBUS_MAX_MSG 40
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