AIM SmartyCam CAN

Introduction

This CAN bus integration maps CAN bus data from AIM systems using the CAN protocol used for the SmartyCam camera system.

Connecting to the AIM system

BMW E46 (including M3)
Connection	AIM Pin	RaceCapture/Pro Pin
CAN High	1	2
CAN Low	4	3
Ground	2	1

Integration Script

--AIM Smarty Cam Stream For Race Capture

--how frequently we poll for CAN messages
tickRate = 30
--the CAN baud rate
CAN_baud = 1000000
--CAN channel to listen on. 0=first CAN channel, 1=second
CAN_chan = 0
--1 for Big Endian (MSB) mode; 0 for Little Endian mode (LSB)
be_mode = 0

--add your virtual channels here
tpsId = addChannel("TPS", 10, 0, 0, 100, "%")
tempId = addChannel("EngineTemp", 1, 0, 0, 120, 'C')
oilTempId = addChannel("OilTemp", 1, 0, 0, 170, 'C')
rpmId = addChannel("RPM", 10, 0, 0, 10000, 'RPM')
oilPresId = addChannel("OilPress", 10, 2, 0, 10, 'B')
fuellevelId = addChannel("FuelLevel", 1, 0, 0, 120, "L")
temp1Id = addChannel ("Temp1" , 1, 0, 0, 170, 'C')

temp2Id = addChannel ("Temp2" , 1, 0, 0, 170, 'C')
ch1Id = addChannel ("Ch1", 1, 0, 0, 170, "C") 
ch2Id = addChannel ("Ch2", 1, 0, 0, 170, "C")
ch3Id = addChannel ("Ch3", 1, 0, 0, 170, "C")
ch4Id = addChannel ("Ch4", 1, 0, 0, 170, "C")
ch5Id = addChannel ("Ch5", 1, 0, 0, 170, "C")
ch6Id = addChannel ("Ch6", 1, 0, 0, 170, "C")
ch7Id = addChannel ("Ch7", 1, 0, 0, 170, "C")
fuelPresId = addChannel ("FuelPress", 10, 2, 0, 10, "B")

gearId = addChannel ("Gear", 10, 0, 0, 7, "#")

--customize here for CAN channel mapping
--format is: [CAN Id] = function(data) map_chan(<channel id>, data, <CAN offset>, <CAN length>, <multiplier>, <adder>)
CAN_map = {
[1056] = function(data) map_chan(rpmId, data, 0, 2, 1, 0) map_chan(gearId, data, 4, 2, 1, 0) map_chan_le(tempId, data, 6, 2, 0.1, 0) end,
[1057] = function(data) map_chan(temp1Id, data, 0, 2, 0.1, 0) map_chan(temp2Id, data, 2, 2, 0.1, 0) map_chan(oilTempId, data, 4, 2, 0.1, 0) map_chan_le(oilPresId, data, 6, 2, 0.01, 0) end,
[1058] = function(data) map_chan(ch3Id, data, 0, 2, 0.01, 0) map_chan(tpsId, data, 2, 2, 1, 0) map_chan(ch1Id, data, 4, 2, 1, 0) map_chan(ch2Id, data, 6, 2, 1, 0) end
,
[1059] = function(data) map_chan(ch4Id, data, 0, 2, 1, 0) map_chan(ch5Id, data, 2, 2, 0.01, 0) map_chan(ch6Id, data, 4, 2, 0.01, 0) map_chan(ch7Id, data, 6, 2, 0.01, 0) end,
[1060] = function(data) map_chan(fuellevelId, data, 0, 2, 1, 0) map_chan(fuelPresId, data, 2, 2, 0.1, 0) end
}

function onTick()
    processCAN(CAN_chan)
end

--===========do not edit below===========
function processCAN(chan)
    repeat
        local id, e, data = rxCAN(chan)
        if id ~= nil then
            local map = CAN_map[id]
            if map ~= nil then
                map(data)        
            end
        end
    until id == nil
end

--Map CAN channel, little endian format
function map_chan_le(cid, data, offset, len, mult, add)
    offset = offset + 1
    local value = 0
    local shift = 1
    while len > 0 do
        value = value + (data[offset] * shift)
        shift = shift * 256
        offset = offset + 1
        len = len - 1
    end
    setChannel(cid, (value * mult) + add)
end

--Map CAN channel, big endian format
function map_chan_be(cid, data, offset, len, mult, add)
    offset = offset + 1
    local value = 0
    while len > 0 do
        value = (value * 256) + data[offset]
        offset = offset + 1
        len = len - 1
    end
    setChannel(cid, (value * mult) + add)
end

map_chan = (be_mode == 1) and map_chan_be or map_chan_le
initCAN(CAN_chan, CAN_baud)
setTickRate(tickRate)