RaceCapturePro Lua Scripting Examples: Difference between revisions
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==Display OBDII Codes as a channel and allow driver to reset the OBDII Codes with a button== | ==Display OBDII Codes as a channel and allow driver to reset the OBDII Codes with a button== | ||
This script creates a virtual channel called OBDIICodes and sets it to the first OBDII Trouble Code found (It will not have the alpha prefix (Ie P, C , B, or U), but will just have up to 4 digits. You can then use these digits to figure out the P code. Ie, if 155 is returned, your OBDII code would be P0155. If -1 is shown for the OBDIICodes channel that means RaceCapture has not received any | This script creates a virtual channel called OBDIICodes and sets it to the first OBDII Trouble Code found (It will not have the alpha prefix (Ie P, C , B, or U), but will just have up to 4 digits. You can then use these digits to figure out the P code. Ie, if 155 is returned, your OBDII code would be P0155. If -1 is shown for the OBDIICodes channel that means RaceCapture has not received any codes from the ECU yet. If 0 is shown for OBDIICodes channel that means the ECU sent back P0000 which means there are no OBDII trouble codes in the ECU. This channel will be logged and sent via telemetry just like a regular channel. If more than one OBDII code is found, it will cycle setting the OBDIICodes channel to the first 2-3 OBDII codes that were returned. It will cycle to the next code every couple of seconds. | ||
I also added the ability for the driver to reset the OBDII Trouble codes using an external button. This button needs to be mapped to an Analog or GPIO channel called ClearOBD. It will reset the vehicle's OBDII codes and reset the OBDIICodes channel to -1. | I also added the ability for the driver to reset the OBDII Trouble codes using an external button. This button needs to be mapped to an Analog or GPIO channel called ClearOBD. It will reset the vehicle's OBDII codes and reset the OBDIICodes channel to -1. |
Revision as of 15:56, 10 April 2020
How to set a script in the RaceCapture app
HowTo video: set custom script
API Reference
OBDII tricks
Clear current trouble codes
This script clears any current trouble codes every 10 seconds. Clearing the code requires transmitting an OBDII command to ID 0x7DF with mode 4 specified. No other parameters are specified.
setTickRate(1) count = 0 function onTick() checkClearCodes() end function checkClearCodes() if count % 10 == 0 then print('clearing codes') txCAN(0, 0x7df, 0, {1,4}) end end
Query and Decode Diagnostic Trouble Code
This script queries for a DTC, and if found, prints the decoded trouble code and the raw data.
--This example queries for and reads the first available DTC, if present. setTickRate(1) --P=Powertrain, C=Chassis, B=Body, U=Network prefixes = {'P','C','B','U'} digits = {'0','1','2','3','4','5','6','7','8','9','A','B','C','D','E','F'} function toDigit(v) return digits[v+1] end function printDTC(data) local dtc local a = data[3] local b = data[4] local prefix = prefixes[bit.band(bit.rshift(a, 6), 0x03) + 1] local c2 = bit.band(bit.rshift(a, 4), 0x03) local c3 = bit.band(a, 0x0f) local c4 = bit.band(bit.rshift(b, 4), 0x0F) local c5 = bit.band(b, 0x0F) local code = prefix ..toDigit(c2) ..toDigit(c3) ..toDigit(c4) ..toDigit(c5) println('Found DTC: ' ..code) end function printRawDTC(data) print('Raw DTC bytes: ') --print the remaining 6 bytes, --this raw data holds the trouble codes for i=1, #data do print(' ' ..data[i]) end println('') end function checkDTCResponse() local attempts = 0 while attempts < 50 do local id,ext, data = rxCAN(0, 10) if id ~= nil and ext == 0 and id == 0x7e8 then if data[2] == 0x43 then if data[1] > 2 then printRawDTC(data) printDTC(data) else println('No DTC Found') end return end end attempts = attempts + 1 end end function sendCheckDTC() println('Sending check DTC') txCAN(0, 0x7df, 0, {1,3}) end function onTick() sendCheckDTC() checkDTCResponse() end
Display OBDII Codes as a channel and allow driver to reset the OBDII Codes with a button
This script creates a virtual channel called OBDIICodes and sets it to the first OBDII Trouble Code found (It will not have the alpha prefix (Ie P, C , B, or U), but will just have up to 4 digits. You can then use these digits to figure out the P code. Ie, if 155 is returned, your OBDII code would be P0155. If -1 is shown for the OBDIICodes channel that means RaceCapture has not received any codes from the ECU yet. If 0 is shown for OBDIICodes channel that means the ECU sent back P0000 which means there are no OBDII trouble codes in the ECU. This channel will be logged and sent via telemetry just like a regular channel. If more than one OBDII code is found, it will cycle setting the OBDIICodes channel to the first 2-3 OBDII codes that were returned. It will cycle to the next code every couple of seconds.
I also added the ability for the driver to reset the OBDII Trouble codes using an external button. This button needs to be mapped to an Analog or GPIO channel called ClearOBD. It will reset the vehicle's OBDII codes and reset the OBDIICodes channel to -1.
Here is a video of the functionality in action.
--Modified by Scott Barton of ProFormance Coaching for Autosport Labs Community tickRate = 5 setTickRate(tickRate) counter=0 --P=Powertrain, C=Chassis, B=Body, U=Network prefixes = {'P','C','B','U'} digits = {'0','1','2','3','4','5','6','7','8','9','A','B','C','D','E','F'} OBDCodes = {'-1'} currCode = 1 addChannel("OBDIICodes", 1, 0) setChannel("OBDIICodes", -1)-- Some car manufactures send P0000 if there are no fault codes; therefore we will use -1 to know that no codes have been returned yet function clearOBDCodes() for i=#OBDCodes, 1, -1 do OBDCodes[i] = nil end OBDCodes[1] = '-1' end function addOBDCode(code) local codeFound = false for i=1, #OBDCodes do if OBDCodes[i] == '-1' or OBDCodes[i] == 0 then OBDCodes[i] = nil end if OBDCodes[i] == code then codeFound=true end end if not codeFound then OBDCodes[#OBDCodes+1] = code println(#OBDCodes ..' Total OBDII Codes Found So Far') end end function displayOBDCodes() counter = counter+1 if counter == 3*tickRate then --seconds since last update currCode = currCode+1 if currCode>#OBDCodes then currCode=1 end --println('Updating OBDII Code ' ..currCode ..' ' ..OBDCodes[currCode]) counter = 0 end setChannel("OBDIICodes", OBDCodes[currCode]) end function checkClearCodes(canChan) local ClrOBD = getChannel("ClearOBD ") --Must create an analog or GPIO channel called ClearOBD in your settings and map it to read 1 or higher when you push the external button wired to that input if ClrOBD ~= nil and ClrOBD > 0 then println('Clearing OBDII codes') txCAN(canChan, 0x7df, 0, {1,4}) --sends reset OBDII codes command to ECU clearOBDCodes() setChannel("OBDIICodes", -1) end end function toDigit(v) return digits[v+1] end function printDTC(data) local dtc local a = data[3] local b = data[4] local prefix = prefixes[bit.band(bit.rshift(a, 6), 0x03) + 1] local c2 = bit.band(bit.rshift(a, 4), 0x03) local c3 = bit.band(a, 0x0f) local c4 = bit.band(bit.rshift(b, 4), 0x0F) local c5 = bit.band(b, 0x0F) local code = toDigit(c2) ..toDigit(c3) ..toDigit(c4) ..toDigit(c5) addOBDCode(code) --setChannel("OBDIICodes", code) code = prefix ..code println('Found DTC: ' ..code) a = data[5] b = data[6] local d2 = bit.band(bit.rshift(a, 4), 0x03) local d3 = bit.band(a, 0x0f) local d4 = bit.band(bit.rshift(b, 4), 0x0F) local d5 = bit.band(b, 0x0F) local code2 = toDigit(d2) ..toDigit(d3) ..toDigit(d4) ..toDigit(d5) if tonumber(code2) ~= nil and tonumber(code2)>1 then addOBDCode(code2) code2 = prefix ..code2 println('Found 2nd DTC: ' ..code2) end a = data[7] b = data[8] local e2 = bit.band(bit.rshift(a, 4), 0x03) local e3 = bit.band(a, 0x0f) local e4 = bit.band(bit.rshift(b, 4), 0x0F) local e5 = bit.band(b, 0x0F) local code3 = toDigit(e2) ..toDigit(e3) ..toDigit(e4) ..toDigit(e5) if tonumber(code3) ~= nil and tonumber(code3)>1 then addOBDCode(code3) code3 = prefix ..code3 println('Found 3rd DTC: ' ..code3) end end function printRawDTC(data) print('Raw DTC bytes: ') --print the remaining 6 bytes, --this raw data holds the trouble codes for i=1, #data do print(' ' ..data[i]) end println('') end function checkDTCResponse(canChan) local attempts = 0 while attempts < 50 do local id,ext, data = rxCAN(canChan, 10) if id ~= nil and ext == 0 and id == 0x7e8 then if data[2] == 0x43 then if data[1] > 2 then printRawDTC(data) printDTC(data) else --println('No DTC Found') end return end end attempts = attempts + 1 end end function sendCheckDTC(canChan) --println('Sending check DTC') txCAN(canChan, 0x7df, 0, {1,3}) end function onTick() sendCheckDTC(1) --0=OBDII is on CAN Channel 1; 1=OBD is on CAN Channel 2 checkDTCResponse(1) displayOBDCodes() checkClearCodes(1) end
Data filtering
Simple RPM Filter
Got a noisy RPM signal where big spikes show up? This will reject RPM values above a sane threshold.
Important - make sure the RPM channel in the main RaceCapture/Pro config is disabled, since this virtual channel replaces it.
--sample RPM at 10Hz setTickRate(10) --set this value to be your sane upper limit rpmLimit = 10000 --In the RCP config, ensure the timer channels are disabled --we will create the virtual channel here rpmId = addChannel( "RPM", 10, 0, 0, rpmLimit) rpm = 0 function doRPM() local r = getTimerRpm(0) if r < rpmLimit then rpm = r end setChannel(rpmId, rpm) end function onTick() doRPM() end
Automatic logging control
Automatically Start Logging When Powered On
This script will automatically start logging the moment RaceCapture/Pro turns on
- Note, this will create a file with an incorrect timestamp if GPS lock is not established.
- To get a properly time-stamped file, use the GPS speed triggered approach.
function onTick() startLogging() end
Automatically Start Logging based on GPS Speed
This script will automatically start logging to SD card when speed exceeds 10MPH and stop when it falls below.
function onTick() if getGpsSpeed() > 10 then startLogging() else stopLogging() end end
Automatically Start Logging when engine is running
This script will automatically start logging to SD card when battery voltage shows that the engine is running
- When battery voltage is greater than 13 volts, we assume engine is running.
- System battery voltage is tied to the last Analog channel (8) (Note, change this to 7 if RaceCapture/Pro MK2)
function onTick() if getAnalog(8) > 13 then startLogging() else stopLogging() end end
Automatically start Logging upon Launch (AutoX / Rally / Hill Climb)
This script will start Logging when a dash mounted "ARM" switch is activated via an input and G-force exceeds a threshold Given:
- GPIO 0 configured as input and connected to dash mounted "Arm" switch
- Default RaceCapture/Pro mounting orientation (terminal block facing forward, mounted upright)
- G-force launch threshold is -0.1 G
- flipping the ARM switch to 'Off' will stop logging
setTickRate(30) overRevId = addChannel("OverRev", 10) function onTick() local arm = getGpio(0) local g = getAccel(1) if arm == 0 then stopLogging() end if arm == 1 and g < 0.1 then startLogging() end end
Virtual Channels (AKA Math Channels)
Averaging a fuel level reading or other sensor
This script calculates a moving average to account for fuel slosh. Assumptions:
- Fuel level is connected to the first analog channel and is calibrated; modify the script to base the reading on other channels as appropriate.
--The real analog channel should be named --something other than FuelLevel fuel2Id = addChannel("FuelLevel", 10, 0, 0,100,"%") --change this to make a bigger averaging window maxAvg = 600 --600 = 20 seconds averaging at 30Hz tick rate --do not change fuelAvg={} fuel2Index = 1 function updateFuelAvg(value) local i if #fuelAvg == 0 then --initialize averaging table for i = 1, maxAvg do fuelAvg[i]=0 end end fuelAvg[fuel2Index] = value fuel2Index = fuel2Index + 1 if fuel2Index > maxAvg then fuel2Index = 1 end local sum = 0 for i = 1, #fuelAvg do sum = sum + fuelAvg[i] end setChannel(fuel2Id, sum / maxAvg) end setTickRate(30) function onTick() updateFuelAvg(getAnalog(0)) end
Average two sensor values and set to a virtual channel
--10Hz update setTickRate(10) --Create channel: "SensorAvg" --Sample rate: 10Hz --Logging precision: 2 decimal points --min/max: 0/5 --Units: "Volts" avgId = addChannel("SensorAvg", 10, 2, 0, 5, "Volts") function onTick() local a1 = getAnalog(0) local a2 = getAnalog(1) setChannel(avgId, (a1 + a2) / 2) end
Gear Calculation
Calculate gear position based on drive train ratios, RPM channel and gear. Requires firmware 2.5.0
Edit the gear ratios to match your vehicle. Assumes Speed is available on "Speed" channel, RPM is available on "RPM" channel.
More details under the calcGear API documentation.
setTickRate(30) --create gear channel gearId = addChannel("Gear", 10, 0, 0, 6) function onTick() -- calculate gear: tire diameter(cm), final gear ratio, individual gear ratios 1-6 local gear = calcGear(62.7, 3.45, 4.23, 2.52, 1.66, 1.22, 1.0, 0.8) if gear == nil then gear = 0 end setChannel(gearId,gear) end
Also available as a preset
Throttle Position Calculation
Estimate throttle position based on G-Forces. 0-100%
--Developed by Scott Barton of ProFormance Coaching for use by Autosport Labs Community MaxAccelG = 0.30 -- Look at your logs and see what your max acceleration is in 3rd or 4th gear. Note that full acceleration in 5th will not show 100% throttle. chThrottle = addChannel("vThrottle", 10, 0, 0, 100,'') function updatevThrottle() --AccelG = getChannel(LongAccel) --2.13 Firmware and up AccelG = getImu(0) --Prior to 2.13 Firmware TPS = (AccelG/MaxAccelG)*100 if TPS < 0 then TPS = 0 end TPS = math.abs(TPS) if TPS > 99 then TPS = 100 end setChannel(chThrottle, TPS) end --10Hz update setTickRate(10) function onTick() updatevThrottle() end
Brake Position Calculation
Estimate brake pedal position based on G-Forces. 0-100%.
--Developed by Scott Barton of ProFormance Coaching for use by Autosport Labs Community MaxDecelG = 1.20 --Look at your logs and see what your maximum g-forces under straight line braking is and round down. chBrake = addChannel("vBrake", 10, 0, 0, 100, '') function updatevBrake() --BrakeG = getChannel(LongAccel) -- 2.13 Firmware and up BrakeG = getImu(0) --Prior to 2.13 Firmware --if ReverseAccel then BrakeG = BrakeG *-1 --BrakeG = -1.1 BrakePos = (BrakeG/MaxDecelG)*100 if BrakePos < 10 then BrakePos = 0 end BrakePos = math.abs(BrakePos) if BrakePos > 99 then BrakePos=100 end setChannel(chBrake, BrakePos) end --10Hz update setTickRate(10) function onTick() updatevBrake() end
Max RPM detection with GPIO reset
This script detects the peak RPM detected and stores it in a virtual channel. A GPIO is used to reset the channel to zero via a push button.
maxRpmId = addChannel("MaxRPM", 10) maxRpm = 0 function rpmReset() local rpm = getTimerRpm(0) local clear = getGpio(0) if rpm > maxRpm then maxRpm = rpm setChannel(maxRpmId, maxRpm) end if clear == 0 then maxRpm = 0 setChannel(maxRpmId, maxRpm) end end function onTick() rpmReset() end
Alerts/Notifications
Create an over-rev marker
This script will mark the datalog with an over-rev alert marker whenever RPMs are above a certain threshold. It will insert the current lap number to the OverRev channel. If multiple occurrences happen, you can take a look the event summary page and then look at each of those lap to see where and when it happened.
Given:
- RPM is connected a timer channel called RPM
- RPM over-rev condition is 8000
setTickRate(10) overRevId = addChannel("OverRev", 10) function onTick() local rpm = getChannel("RPM") if rpm ~= nil and rpm > 8000 then setChannel(overRevId, getLapCount()) end
Create an Impact marker
This script will mark the datalog with an impact occurs (very high G-Forces). It will insert the current lap number to the Impact channel. If multiple occurrences happen, you can take a look the event summary page and then look at each of those lap to see where and when it happened.
setTickRate(10) impactId = addChannel("Impact", 10) function onTick() local gsum = getChannel("Gsum") if gsum ~= nil and gsum > 2.0 then --Assumes anything over 2.0G's is an impact. Change to suit your needs. setChannel(impactId, getLapCount()) end end
Control a Fan or Pump switch based on Temp
function updateDiffSwitch() local diffTemp = getChannel("DiffTemp") --Change to your temperature channel name if diffTemp ~=nil and diffTemp > 180 then --update temp to turn on at setGpio(2,1) elseif diffTemp ~=nil and diffTemp < 160 then --update temp to turn off at setGpio(2,0) --Uses GPIO3 for output. Increase SampleRate or TickRate if it isn't turning on end end
Alert driver via electro-shock if oil pressure below safe threshold
This will alert driver via a shock (using pet scat mat) if oil pressure drops below threshold while engine is running above certain RPM
Script will check at 10Hz (10 times/sec) for threshold condition
Given:
- Oil pressure on analog channel 0, and calibrated
- Seat mounted pet scat mat installed in seat and controlled by GPIO 0 (GPIO switches ground when active)
- GPIO 0 is configured for output mode
- RPM is connected to timer input 0
--onTick() is called at 10Hz setTickRate(10) rpmThreshold = 2000 lowOilPressure = 15 function onTick() local shockDriver = 0 if getTimerRpm(0) > rpmThreshold and getAnalog(0) < lowOilPressure then shockDriver = 1 end setGpio(0, shockDriver) end
Track Max RPM / Value
This script will track a channel's maximum value and set a new channel with that maximum. Given:
- RPM is connected to the first Timer input channel
setTickRate(10) maxRpmId = addChannel("MaxRPM", 10) maxRpm = 0 function onTick() local rpm = getTimerRpm(0) if rpm > maxRpm then maxRpm = rpm setChannel(maxRpmId, maxRpm) end end
Activate a GPIO when start finish line is crossed
This script will pulse one of the GPIO outputs when the start/finish line is detected. First, the onTick rate is set to 10hz, then setGpio() is called with the result of the call to getAtStartFinish()
setTickRate(10) function onTick() if getAtStartFinish() == 1 then setGpio(0, 1) else setGpio(0, 0) end end
or
setTickRate(10) function onTick() setGpio(0, getAtStartFinish()) end
Temperature Warning Indicator Light
This script will activate an output if an analog input exceeds a threshold. It's assumed a temperature sensor is connected to the Analog input channel 0 and is calibrated.
More information: Installation Guide, Sensor Guide, Operation Guide
function onTick() if getAnalog(0) > 212 then setGpio(0, 1) else setGpio(0, 0) end end
Multi warning light
A script to trigger a warning light if at least one condition occurs. This will activate the output if the engine temperature is greater than 212 or if oil pressure drops below 10.
- Note Actual temperature and pressure sensors must be connected to the appropriate analog inputs and correctly calibrated.
--Analog 0 is engine temp, in degrees F --Analog 1 is oil pressure, in PSI function onTick() if getAnalog(0) > 212 or getAnalog(1) < 10 then setGpio(0, 1) else setGpio(0, 0) end end
Enable an LED if fuel level drops below 10%
- Using PWM/Analog output
only available on RaceCapture/Pro MK1 and MK2
- Fuel sensor is on Analog 0, scaled 0-100%
- LED indicator connected to PWM 0. When fuel level drops below 10%, Analog/PWM output 0 will show 5v; 0v if fuel level is higher
- PWM channel settings are set to factory default
function onTick() local p = 0 if getAnalog(0) < 10 then p = 100 end setPwmDutyCycle(0,p) end
- Using GPIO in output mode
- When fuel level drops below 10%, the GPIO is activated (output is grounded). Can be used to drive a relay or other device up to 1A load
- GPIO jumper set to output mode
- GPIO setting in firmware set to match jumper setting
function onTick() local p = 0 if getAnalog(0) < 10 then p = 1 end setGpio(0, p) end
3 stage Sequential Shift Light
Activates a 3 stage sequential shift light. Also see the Sequential Shift Light project
Given:
- RPM sensor on timer input 0
- GPIO channels are configured in output mode under Setup/GPIO
setTickRate(15) function onTick() local r = getTimerRpm(0) if r > 5000 then setGpio(2,1) else setGpio(2,0) end if r > 6000 then setGpio(1,1) else setGpio(1,0) end if r > 7000 then setGpio(0,1) else setGpio(0,0) end end
ProFormance Meter
Uses ShiftX to show you how much available grip you are using and how much is left. It also creates and updates the ProFormace channel which is an integer from 0-9. Closer to 9 you are the closer you are to max available grip.
Instead of just using GSum, this takes into account that your MaxLatG's will be different than your MaxLongG's and gives you a more accurate representation of what you can do based on whether you are braking, turning, or accelerating.
It also has 2 different models. 1) for an Advanced Driver and 2) for a Pro Driver. This is based on typical friction circles of Advanced Drivers vs Pro Drivers respectively. See the OnTick funtion to change DriverLevel.
It also has an Oversteer Alert feature for ShiftX. Change the YawThreshold value to suit your needs.
setTickRate(25) sxSetConfig(1) yawThreshold = 25 --At what yaw rate do you want the oversteer alarm lights to trigger' Check normal max yaw on your Podium.live race summaries to get a better idea of what value you should use maxGsumId = addChannel("MaxGsum", 25, 2, -2.0, 2.0) pctGsumMaxId = addChannel("PctMaxGsum", 25, 0, 0, 100) maxLatGId = addChannel("MaxLatG", 25, 2, -2.0, 2.0) maxBrakeGId = addChannel("MaxBrakeG", 25, 2, -2.0, 2.0) maxAccelGId = addChannel("MaxAccelG", 25, 2, -2.0, 2.0) ProFormanceRatingId = addChannel("ProFormance", 25, 0, 9) maxGsum = .3 maxLatG = .2 maxBrakeG = .2 maxAccelG = .1 currLatG = 0 longG = 0 lastLongG = 0 lastLatG = 0 function updateGStats() local gsum = getChannel("Gsum") if gsum ~= nil and gsum > 0 then if gsum > maxGsum then maxGsum = gsum setChannel(maxGsumId, maxGsum) end setChannel(pctGsumMaxId, (gsum / maxGsum) * 100) end local latG = getChannel("AccelY") if latG ~= nil then latG = math.abs(latG) if latG > maxLatG then maxLatG = latG setChannel(maxLatGId, maxLatG) end end local currLongG = getChannel("AccelX") if currLongG ~= nil then if currLongG>0 then if currLongG > maxBrakeG then maxBrakeG = currLongG setChannel(maxBrakeGId, maxBrakeG) end elseif currLongG<0 then currLongG = math.abs(currLongG) if currLongG>maxAccelG then maxAccelG = currLongG setChannel(maxAccelGId, maxAccelG) end end end end function alertYaw(Yaw) --Light up the side ShiftX lights in case of an Oversteer event if Yaw >= yawThreshold+20 then sxSetLed(7,2,255,255,255,9) elseif Yaw >= yawThreshold+10 then sxSetLed(7,2,255,255,255,5) elseif Yaw >= yawThreshold then sxSetLed(7,2,255,255,255,3) else sxSetLed(7,2,0,0,0,0) end end function resetSxLeds() --resets all the ShiftX lights to off sxSetLed(0,0,0,0,0,0) end function getProFormanceRating(driverLevel) --Calculate how much grip they are using and how much is left --driverLevel: 1=Advanced, 2=Pro local cLatG = getChannel("AccelY") if cLatG ~= nil then currLatG = math.abs(cLatG) end local cLongG = getChannel("AccelX") if cLongG ~= nil then longG = cLongG end local BrakeAccel = "Braking" local maxLongG = maxBrakeG --may not want to do this --if longG <= -0.01 then --Calculate Accel G's seperate from Braking G's -- BrakeAccel = "Accelerating" -- maxLongG = maxAccelG --end local currLongG = math.abs(longG) local latGAvail = 0 local longGAvail = 0 if driverLevel==1 then --Advanced driver latGAvail = maxLatG*(1-(currLongG/maxLongG)) longGAvail = maxLongG*(1-(currLatG/maxLatG)) else --Pro Driver latGAvail = math.sqrt(((maxLatG - ((maxLatG-maxLongG)*(currLongG/maxLongG)))^2)-(currLongG^2)) longGAvail = math.sqrt(((maxLongG - ((maxLongG-maxLatG)*(currLatG/maxLatG)))^2)-(currLatG^2)) end local percGUsedLat if latGAvail <= 0 then percGUsedLat = 1 else percGUsedLat = currLatG/latGAvail end local percGUsedLong if longGAvail <= 0 then percGUsedLong = 1 else percGUsedLong = currLongG/longGAvail end local ProFormanceRating if currLongG-lastLongG > currLatG-lastLatG then local TotalPot2 if (math.sqrt((currLatG^2)+(longGAvail^2))) <= 0 then TotalPot2 = 1 else TotalPot2 = (math.sqrt((currLatG^2)+(currLongG^2)))/(math.sqrt((currLatG^2)+(longGAvail^2))) end local TotalPot3 if (currLatG+longGAvail) <= 0 then TotalPot3 = 1 else TotalPot3 = (currLatG+currLongG)/(currLatG+longGAvail) end local avgTotPot = (((percGUsedLat+((1-(currLatG/maxLatG))*percGUsedLong))*2)+TotalPot2+TotalPot3)/4 ProFormanceRating = math.floor(avgTotPot*10) else local TotalPot2 if (math.sqrt((currLongG^2)+(latGAvail^2))) <= 0 then TotalPot2 = 1 else TotalPot2 = (math.sqrt((currLatG^2)+(currLongG^2)))/(math.sqrt((currLongG^2)+(latGAvail^2))) end local TotalPot3 if (currLongG+latGAvail) <= 0 then TotalPot3 = 1 else TotalPot3 = (currLatG+currLongG)/(currLongG+latGAvail) end local avgTotPot = (((percGUsedLong+((1-(currLongG/maxLongG))*percGUsedLat))*2)+TotalPot2+TotalPot3)/4 ProFormanceRating = math.floor(avgTotPot*10) end if ProFormanceRating<0 then ProFormanceRating=0 end if ProFormanceRating>9 then ProFormanceRating=9 end setChannel(ProFormanceRatingId, ProFormanceRating) lastLongG = currLongG lastLatG = currLatG return ProFormanceRating end function showProFormanceSx(rating) --Show ProFormanceRating on ShiftX local numLeds=7 --How many LEDs on the ShiftX do you want to use for the ProFormance meter. Default is 7; the 7 in the middle resetSxLeds() sxSetLed(0,numLeds,255,0,0,0) local percLeds = (.1*rating*(numLeds+1)) local greenLeds =math.floor(percLeds) if greenLeds>0 then sxSetLed(0,greenLeds,0,255,0,0) end if percLeds-greenLeds>0.61 then sxSetLed(greenLeds,1,100,100,0,2) end sxSetDisplay(0,rating) end function onTick() resetSxLeds() updateGStats() --ProFormance driver level: 1=Advanced, 2=Pro local driverLevel = 1 local ProFormanceRating = getProFormanceRating(driverLevel) showProFormanceSx(ProFormanceRating)--Show ProFormance Rating on ShiftX if getChannel("Yaw")~=nil then Yaw = getChannel("Yaw") end if math.abs(Yaw)>yawThreshold-5 then alertYaw(math.abs(Yaw)) end collectgarbage() end
CAN bus scripts
Receive a CAN message on one bus and re-transmit on a different bus
setTickRate(30) function onTick() id, ext, data = rxCAN(0) if (id ~= nil) then txCAN(1, id, ext, data) end end
Send A CAN message with current GPS speed
Given:
- Destination CAN device is looking for a message with ID 1234
- Standard (11 bit) CAN identifer
- CAN1 channel is used
function onTick() local speed = getGpsSpeed() --format the speed in a CAN message. Speed is in the first byte local msg = {speed} txCAN(0, 1234, 0, msg) end
Send A CAN message with a temperature value
available in future Firmware version 2.0
Given:
- Analog 0 reads a calibrated temperature value between 0 and 255
- Destination CAN device is looking for a message with ID 1234
- Standard (11 bit) CAN identifer
- CAN1 channel is used
function onTick() local tmp = getAnalog(0) local msg = {tmp} txCAN(0, 1234, 0, msg) end
Use RCP as a general purpose CAN data logger
The following script will output any received CAN bus message to the log window.
- You can access the log window by enabling polling in the script window under the RaceCapture app configuration view
- You can also access the log window by connecting to RaceCapture/Pro from a terminal program (hyperterminal, Minicom, etc) and issuing the command: viewLog
setTickRate(30) --30Hz function onTick() repeat --will drain CAN buffer on each tick id, e, data = rxCAN(0) if id ~= nil then print(id ..':') for i=1,#data do print(data[i] ..' ') end println('') end until id == nil end
Receive a CAN message and set a virtual channel
Given:
- creates a channel named "MyChannel" that logs at 10Hz
- Sets tick rate to 10Hz
- Receive a CAN message on CAN1 channel, with 100ms timeout
- if data received is valid (by checking the CAN message ID is not nil), then set the virtual channel with the first element in the CAN message data
channelId = addChannel("MyChannel", 10) setTickRate(10) function onTick() id, ext, data = rxCAN(0, 100) if id ~= nil then setChannel(channelId, data[1]) end end
Note: To map real CAN bus data, consult your CAN bus protocol documentation for correctly mapping CAN bus data to virtual channels.
CAN bus loopback test
Use This script to test functionality of your CAN bus.
Wiring / Setup
- Connect CAN1 high -> CAN2 high and CAN1 low -> CAN2 low. This can either be done though the main wiring harness or the RJ45 connector.
- Note if your unit has CAN on the wiring harness and the RJ45 connector, you only need to bridge the connections on one harness, since they are internally wired together.
- Set the CAN baud rates to the same value for CAN1 and CAN 2.
-- CAN loopback test -- * Wire CAN1 high -> CAN2 high and CAN 1 low -> CAN 2 low -- * Ensure baud rate is identical for both CAN1 and CAN2 can_id = 1234 count = 0 function onTick() count = count + 1 -- transmit a CAN message on CAN1 with count as the first byte local tx_result = txCAN(0, can_id, 0, {count}) println('transmit result ' ..tx_result) -- receive a CAN message on CAN2 local id, ext, data = rxCAN(1) if id == nil then println('No CAN message received!') else println('Got CAN message ID: ' ..id ..' data: ' ..data[1]) end end
Serial Port
Read an analog sensor value and output it to the auxiliary serial port
This example reads an analog sensor and writes a string containing the value to the Auxiliary serial port. Repeats once per second.
--initialize Aux serial port to 115200, 8, N, 1 initSer(4, 115200, 8, 0, 1) function onTick() value = getAnalog(0) writeSer(4, 'A=' ..value) end
Read a line of serial data
This example reads a line of serial data and writes it to the internal RaceCapture log.
- Note: You can monitor the log by enabling the log polling in the script configuration view.
--initialize Aux serial port to 115200, 8, N, 1 initSer(4, 115200, 8, 0, 1) function onTick() --read a line from the aux serial port with a 100ms timeout value = readSer(4, 100) if value ~= nil then println('read value: ' ..value) end end
Demo Scripts
RPM Sweep
This sweeps an RPM channel up and down through a pre-defined range. Edit the range at the top of the script.
-- 05 Jan 2016 RPM demo -- F.Mirandola - B.Picasso -- This code will show a demo RPM sweep on RaceCapturePro thrRpmLo = 3000 --Low RPM threshold for change direction thrRpmHi = 10000 --Hi RPM threshold for change direction incrementRpm = 300 --Step between each RPM increment/decrement, will affect the speed, higher = faster -- Do not edit after this!! setTickRate(10) rpm = 0 direction = 0 rpmId = addChannel("RPM", 10, 0, 0, 10000) function onTick() setChannel(rpmId, rpm) if (rpm<=thrRpmHi and direction == 0 ) then rpm = rpm + incrementRpm elseif (rpm>=thrRpmLo and direction == 1 ) then rpm = rpm - incrementRpm end if (rpm>thrRpmHi) then direction = 1 elseif (rpm<thrRpmLo) then direction = 0 end end
Simulating Laps
Here's a neat script that can simulate lap times and predicted times. We've used it to develop dashboard features for the app. Especially interesting is the use of the accelerometer to generate a bit of noise and variability in the data.
--Script to simulate lap and predicted times --Without needing a moving car on race track! --To use, disable Race Timing in RaceCapture/Pro configuration and --use this script etid = addChannel("ElapsedTime", 10, 4) ltid = addChannel("LapTime", 10, 4) ptid = addChannel("PredTime", 10, 4) clid = addChannel("CurrentLap", 10, 0) lcid = addChannel("LapCount", 10, 0) et = 0 --ElapsedTime value lt = 0 --LapTime value pt = 0 --PredTime value cl = 0 --CurrentLap value lc = 0 --LapCount value targetTime = 0.5 --target time for our fake laps setTickRate(10) function onTick() local rnd = getImu(0) --use the IMU to create a random-ish number --simulate a predicted time if we've already --completed a lap --rnd value makes the predicted time jiggle if lc > 0 then pt = targetTime + rnd setChannel(ptid, pt) end --increment elapsed time by 1/10 second et = et + 0.00166666667 setChannel(etid, et) if et > targetTime + rnd then lt = et setChannel(ltid, lt) et = 0 cl = cl + 1 setChannel(clid, cl) if cl > 1 then lc = lc + 1 setChannel(lcid, lc) end end end