Ryan Malloy
8ba53630c0
New protocol handler alongside BMW I/K-Bus: - KLineObd2: 5-baud slow init, fast init (TiniPulse), request/response with half-duplex echo clearing, PID convenience wrapper - Obd2Pids.h: ~20 common PIDs with SAE J1979 decode helpers - obd2_scanner.cpp: polls RPM, speed, coolant, throttle, voltage Build config changes: - config.h: KLINE_* defaults (10400/8N1/MOD256/no idle detect) - platformio.ini: build_src_filter separates sketches, new [env:obd2-scanner] environment with KLINE_TX_INVERT=0
97 lines
2.3 KiB
C
97 lines
2.3 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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// ===================================================================
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// OBD-II K-line configuration (ISO 9141 / ISO 14230)
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// ===================================================================
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// --- UART pin assignments (defaults to same as IBUS — shared hardware) ---
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#ifndef KLINE_RX_PIN
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#define KLINE_RX_PIN IBUS_RX_PIN
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#endif
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#ifndef KLINE_TX_PIN
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#define KLINE_TX_PIN IBUS_TX_PIN
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#endif
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#ifndef KLINE_LED_PIN
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#define KLINE_LED_PIN IBUS_LED_PIN
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#endif
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#ifndef KLINE_UART_NUM
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#define KLINE_UART_NUM IBUS_UART_NUM
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#endif
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// --- Protocol constants ---
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#ifndef KLINE_BAUD
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#define KLINE_BAUD 10400
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#endif
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#ifndef KLINE_FRAMING
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#define KLINE_FRAMING SERIAL_8N1
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#endif
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// TX inversion: 1 for optocoupler (PC817), 0 for transistor circuit
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#ifndef KLINE_TX_INVERT
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#define KLINE_TX_INVERT 0
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#endif
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// ISO 9141 default ECU address for 5-baud slow init
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#ifndef KLINE_INIT_ADDR
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#define KLINE_INIT_ADDR 0x33
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#endif
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