Created
November 2, 2019 22:39
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Rolling GPS latlong logging
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| -- Rolling GPS latlong logging | |
| -- Stores the latest 100 distinct latlong coordinates (redundant coordinates are ignored). | |
| -- If the number of sats is smaller than 4 coordinates are not recorded. | |
| -- requires GPS telemetry | |
| local function rnd(v,d) | |
| if d then | |
| return math.floor((v*10^d)+0.5)/(10^d) | |
| else | |
| return math.floor(v+0.5) | |
| end | |
| end | |
| local function getGPSLatLon() | |
| gpsLatLon = getValue("GPS") | |
| if (type(gpsLatLon) == "table") then | |
| return rnd(gpsLatLon["lat"],5) .. ", " .. rnd(gpsLatLon["lon"],5) | |
| else | |
| return "not currently available" | |
| end | |
| end | |
| local function init_func() | |
| end | |
| local function log_position(latlog,alt,sats) | |
| local logFile = "/LOGS/GPS_rolling_positions.log" | |
| local logRead = io.open(logFile,"r") | |
| local previous_positions = "" | |
| if logRead ~= nil then | |
| -- every log entry is exactly 92chars, read 99 line, equal to 9108 chars | |
| previous_positions = io.read(logRead,9108) | |
| previous_position = "" | |
| for match in string.gmatch(previous_positions, 'LatLong: +"([0-9 ,.-]+)"') do | |
| previous_position = match | |
| break | |
| end | |
| io.close(logRead) | |
| end | |
| if latlog == previous_position then | |
| return | |
| end | |
| local logWrite = io.open(logFile,'w') | |
| if logWrite ~= nil then | |
| io.write(logWrite,string.format("%-13s%-22s","LatLong:",'"'..latlog..'"')) | |
| io.write(logWrite,string.format("%13s%07d","Altitude:",alt)) | |
| io.write(logWrite,string.format("%13s%02d","Satelites:",sats)) | |
| local now = getDateTime() | |
| io.write(logWrite,string.format("%21s", now.year.."-"..now.mon.."-"..now.day.." "..now.hour..":"..now.min..":"..now.sec)) | |
| io.write(logWrite,"\n") | |
| io.write(logWrite,previous_positions) | |
| io.close(logWrite) | |
| end | |
| end | |
| local function run_func() | |
| latlog = getGPSLatLon() | |
| alt = getValue("Alt") | |
| sats = getValue("Sats") | |
| if sats > 3 then | |
| log_position(latlog,alt,sats) | |
| end | |
| end | |
| return { run=run_func, init=init_func } |
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