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193
4G/源代码/lib/agpsZkw.lua
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193
4G/源代码/lib/agpsZkw.lua
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--- 模块功能：GPS辅助定位以及星历更新服务.
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-- 本功能模块只能配合Air820UX系列的模块以及Air530Z模块，中科微GPS芯片使用；
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-- require"agpsZkw"后，会自动开启本功能模块的任务；
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-- 会定期更新GPS星历，星历更新算法如下：
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-- 从最后一次GPS定位成功的时间算起，每隔4小时连接星历服务器下载一次星历数据（大概4K字节），写入GPS芯片。
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-- 例如01:00分开机后，更新了一次星历文件，截止到05:00，“一直没有开启过GPS”或者“开启过GPS，但是GPS从来没有定位成功”，在05:00就会下载星历数据然后写入GPS芯片；
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-- 05:00更新星历数据后，在06:00打开了GPS，并且GPS定位成功，然后在07:00关闭了GPS，关闭前GPS仍然处于定位成功状态；
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-- 截止到11:00，“一直没有开启过GPS”或者“开启过GPS，但是GPS从来没有定位成功”，在11:00就会下载星历数据然后写入GPS芯片；
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-- @module agpsZkw
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-- @author openLuat
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-- @license MIT
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-- @copyright openLuat
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-- @release 2020.10.28
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require"http"
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require"lbsLoc"
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require"net"
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local gps = require"gpsZkw"
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module(..., package.seeall)
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local EPH_TIME_FILE = "/ephTime.txt"
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local EPH_DATA_FILE = "/ephData.bin"
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local sEphData
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local EPH_UPDATE_INTERVAL = 4*3600
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local lastLbsLng,lastLbsLat = "",""
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local function runTimer()
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sys.timerStart(updateEph,EPH_UPDATE_INTERVAL*1000)
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end
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local function writeEphEnd()
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log.info("agpsZkw.writeEphEnd")
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sys.timerStart(gps.close,3000,gps.TIMER,{tag="lib.agpsZkw.lua.eph"})
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sEphData = nil
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end
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local function writeEph()
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log.info("agpsZkw.writeEph")
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gps.writeData(sEphData)
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writeEphEnd()
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end
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local function downloadEphCb(result,prompt,head,body)
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log.info("agpsZkw.downloadEphCb",result,prompt)
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runTimer()
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if result and prompt=="200" and body then
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io.writeFile(EPH_DATA_FILE,body)
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io.writeFile(EPH_TIME_FILE,tostring(os.time()))
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if gps.isFix() then
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else
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sEphData = body
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gps.open(gps.TIMER,{tag="lib.agpsZkw.lua.eph",val=10,cb=writeEphEnd})
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sys.timerStart(writeEph,2000)
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return
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end
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end
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end
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--连接服务器下载星历
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function updateEph()
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if gps.isFix() then runTimer() return end
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http.request("GET","http://download.openluat.com/9501-xingli/CASIC_data.dat",nil,nil,nil,20000,downloadEphCb)
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end
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--JWL在星历的时间范围内，如果有星历文件，重启模块就直接把本地的星历文件写入GPS芯片
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--在AGPS_LOCATED 的订阅事件中，调用此接口。
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function upd_xingli()
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if not gps.isFix() then
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local lstm = io.readFile(EPH_TIME_FILE)
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if not lstm or lstm=="" then return end
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log.info("agpsZkw.upd_xingli lstm=",lstm)
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if os.time()-tonumber(lstm) < EPH_UPDATE_INTERVAL then
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local body = io.readFile(EPH_DATA_FILE)
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if body and #body >0 then
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log.info("agpsZkw.upd_xingli length=",#body)
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sEphData = body
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gps.open(gps.TIMER,{tag="lib.agpsZkw.lua.eph",val=10,cb=writeEphEnd})
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sys.timerStart(writeEph,2000)
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else
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log.info("agpsZkw.upd_xingli wanto update xingli data")
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updateEph()
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end
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end
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end
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end
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--检查是否需要更新星历
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local function checkEph()
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local result
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if not gps.isFix() then
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lastTm = io.readFile(EPH_TIME_FILE)
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if not lastTm or lastTm=="" then return true end
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log.info("agpsZkw.checkEph",os.time(),tonumber(lastTm)," DELTA=",os.time()-tonumber(lastTm))
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result = (os.time()-tonumber(lastTm) >= EPH_UPDATE_INTERVAL)
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end
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if not result then runTimer() end
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return result
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end
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local function setFastFix(lng,lat,tm)
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gps.setFastFix(lat,lng,tm)
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if checkEph() then updateEph() end
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end
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local getloc = 0
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local lbsLocRequesting
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--获取到基站对应的经纬度，写到GPS芯片中
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local function getLocCb(result,lat,lng,addr,time)
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log.info("agpsZkw.getLocCb",result,lat,lng,time and time:len() or 0)
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lbsLocRequesting = false
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if result==0 then
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lastLbsLng,lastLbsLat = lng,lat
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if not gps.isFix() then
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local tm = {year=0,month=0,day=0,hour=0,min=0,sec=0}
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if time:len()==6 then
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tm = {year=time:byte(1)+2000,month=time:byte(2),day=time:byte(3),hour=time:byte(4),min=time:byte(5),sec=time:byte(6)}
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misc.setClock(tm)
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tm = common.timeZoneConvert(tm.year,tm.month,tm.day,tm.hour,tm.min,tm.sec,8,0)
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end
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gps.open(gps.TIMERORSUC,{tag="lib.agpsZkw.lua.fastFix",val=4})
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sys.timerStart(gps.setFastFix,2000,lng,lat,tm)
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getloc = 1
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end
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end
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if result~=0 or gps.isFix() then
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if checkEph() then updateEph() end
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end
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end
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--是否获取到基站对应的经纬度
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function isgetloc()
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return getloc
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end
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local function ipReady()
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if gps.isFix() then
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runTimer()
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else
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if not lbsLocRequesting then
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lbsLocRequesting = true
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lbsLoc.request(getLocCb,nil,30000,"0","bs.openluat.com","12411",true)
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end
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log.info("agpsZkw.ipready to updateEph")
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if checkEph() then
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updateEph()
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else
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sys.timerStart(upd_xingli,3000)
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end
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end
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end
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local function gpsState(evt,para)
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log.info("agpsZkw.GPS_STATE",evt,para)
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if evt=="LOCATION_SUCCESS" or (evt=="CLOSE" and para==true) then
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runTimer()
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elseif evt=="OPEN" then
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local lng,lat = gps.getLastLocation()
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if lng=="" or lat=="" then
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lng,lat = lastLbsLng,lastLbsLat
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end
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if lng~="" and lat~="" then
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gps.open(gps.TIMERORSUC,{tag="lib.agpsZkw.lua.fastFix",val=4})
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local tm = os.date("*t")
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sys.timerStart(gps.setFastFix,2000,lat,lng,common.timeZoneConvert(tm.year,tm.month,tm.day,tm.hour,tm.min,tm.sec,8,0))
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end
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end
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end
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function init()
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sys.subscribe("GPS_STATE",gpsState)
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sys.subscribe("IP_READY_IND",ipReady)
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log.info("agpsZkw.unInit")
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end
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function unInit()
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sys.unsubscribe("GPS_STATE",gpsState)
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sys.unsubscribe("IP_READY_IND",ipReady)
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log.info("agpsZkw.unInit")
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end
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init()
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