56 lines
1.9 KiB
Markdown
56 lines
1.9 KiB
Markdown
# luaCanRxWorkaround
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By default Lua CAN RX is easy but has a performance limitation.
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If 300hz and above Lua CAN RX is needed until a more elegant solution is implemented https://github.com/rusefi/rusefi/issues/6041 we have **luaCanRxWorkaround** magic option.
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For the magic to work two lines are required in the Lua script:
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``global_can_data = { }`` on top
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and at least one ``global_can_data[1]`` read access to ``global_can_data`` anywhere in the script
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```language=lua
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rxCount = 0
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-- magic behind the scenes: luaCanRxWorkaround on ParkingLot2 dialog
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global_can_data = { }
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function onVehicleDetect(bus, id, dlc, data)
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rxCount = rxCount + 1
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if rxCount < 10 then
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-- at least one read from global_can_data to prevent garbage collection
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print('onVehicleDetect ' ..id .." " ..global_can_data[1])
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end
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end
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canRxAddMask(0, 0xFFFFFF00, onVehicleDetect)
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everySecondTimer = Timer.new()
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keepAlive = 0
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function onTick()
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if everySecondTimer : getElapsedSeconds() > 1 then
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everySecondTimer : reset()
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keepAlive = keepAlive + 1
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print("Alive seconds=" ..keepAlive .. " rxCount " .. rxCount )
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end
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end
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```
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Give us
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`2024-02-25_09_12_32_236: EngineState: LUA: Alive seconds=4 rxCount 596
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2024-02-25_09_12_33_240: EngineState: LUA: Alive seconds=5 rxCount 912
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2024-02-25_09_12_34_352: EngineState: LUA: Alive seconds=6 rxCount 1166
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2024-02-25_09_12_35_357: EngineState: LUA: Alive seconds=7 rxCount 1420
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2024-02-25_09_12_36_467: EngineState: LUA: Alive seconds=8 rxCount 1775
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2024-02-25_09_12_37_577: EngineState: LUA: Alive seconds=9 rxCount 2030
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2024-02-25_09_12_38_577: EngineState: LUA: Alive seconds=10 rxCount 2280
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2024-02-25_09_12_39_582: EngineState: LUA: Alive seconds=11 rxCount 2605
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2024-02-25_09_12_40_588: EngineState: LUA: Alive seconds=12 rxCount 2851
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2024-02-25_09_12_41_592: EngineState: LUA: Alive seconds=13 rxCount 3076
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`
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