- Mon Feb 01, 2016 1:21 pm
#40180
NodeMCU LUA SDK 1.5.1
I was showing HEAP SIZE of 20-22k,,, I wanted to increase the free memory so, I decided to place my web page into flash in 4 segments LB0,LB1,LB2,LB3 as functions and retrieve using REQUIRE then execute function.
The functions return a global buffer, I could not figure out how to return contents of local buffer..
The max size each seg is less than 1469 , more like 1100 bytes ..
I managed to cut my code line count 30-40%
MY HEAP is now 14k-16k -- How did I accomplish such a feat!
HOW DID I MANAGE TO DECREASE MY HEAP SIZE THAT MUCH ??????
Below is the code snips I did .....
I was showing HEAP SIZE of 20-22k,,, I wanted to increase the free memory so, I decided to place my web page into flash in 4 segments LB0,LB1,LB2,LB3 as functions and retrieve using REQUIRE then execute function.
The functions return a global buffer, I could not figure out how to return contents of local buffer..
The max size each seg is less than 1469 , more like 1100 bytes ..
I managed to cut my code line count 30-40%
MY HEAP is now 14k-16k -- How did I accomplish such a feat!
HOW DID I MANAGE TO DECREASE MY HEAP SIZE THAT MUCH ??????
Below is the code snips I did .....
Code: Select all
------------------------------- Below is what I thought would be the MAGIC!! ------------------
local function LBuf(scnt,c)
LBx = require("LB"..scnt) --require LB0, LB1, LB2, LB3
LBx.B0() -- execute the function ie return buf data
local cbuf = vt.cbuf -- save in local buffer
vt.cbuf = nil -- set global buf to nil
vt[scnt] = #cbuf -- set var[x] to buffer length
c:send(cbuf) -- send buffer to client
cbuf = nil -- set local buffer to nil
package.loaded[LBx]=nil -- set require code to nil
collectgarbage() -- tidy up
end
------------------------------- below is the send code for each buffer ------------------------------
function Send80(c)
if Scnt==0 then
LBuf(Scnt,c) -- get and send seg 0
elseif Scnt==1 then
LBuf(Scnt,c) -- get and send seg 1
elseif Scnt==2 then
LBuf(Scnt,c) -- get and send seg 2
elseif Scnt==3 then
LBuf(Scnt,c) -- get and send seg 3
elseif Scnt==4 then
vt[4]=100 --guesstimate
local cbuf = vt[0].." | "..vt[1].." | "..vt[2].." | "..vt[3].." | "..vt[4].." | "
..vt[0]+vt[1]+vt[2]+vt[3]+vt[4].." Baud: "..vt.baud.." | "..vt.lua
c:send(cbuf) -- get and send seg 5
cbuf=nil
end
if Scnt >=5 then
c:close() -- close connection
c=nil
end
Scnt=Scnt+1 -- point next seg
vt.Lcb=vt[0]+vt[1]+vt[2]+vt[3]+vt[4] --compute size
collectgarbage()
end --function end
------------------- Below is the typical HTML LB0, LB1,LB2,Lb3 code in flash ----------------
local LB0 = {}
function LB0.B0()
vt.cbuf = '<!DOCTYPE HTML>\n<html lang="en-US">\n<head><meta http-equiv="refresh" content="'
..rfh..'" ></head>'
..'<script type = "text/javascript">\nvar timeInSecs;\nvar ticker;'
..'function startTimer(secs){ timeInSecs = parseInt(secs)-1; ticker = setInterval("tick()",1000); }'
..'function tick() { var secs = timeInSecs; if (secs>0) {timeInSecs--;} else {clearInterval(ticker); startTimer('..rfh..');}'
..'document.getElementById("countdown").innerHTML = secs;} startTimer('..rfh..'); </script>'
..'<body><table bgcolor="Lawngreen" border="1" cellpadding="5">'
..'<tr><th><h3>ESP8266</h3><h3>'..vt.device..'</h3></th><th><h3>-SDK-</h3><h3>NodeMCU</h3></th>'
..'<th><h3>'..yver..'</h3><h3>'..vt.sware..'</h3></th><th><h3>AAA</h3><h3>BBB</h3></th>'
..'<td><IMG SRC="'..vt.s_img..'" LEFT="1" WIDTH="120" HEIGHT="60" BORDER="1"></td>'
..'<th><h3 id="countdown">'..rfh..'</h3><h3>'..vt.pass..'</h3></th></tr>'
..'<th bgcolor="Cyan">'..vt.mac..'</th><th bgcolor="Yellow">'..vt.ipa..'</th>'
..'<th>'..vt.pass..'</th><th>'..vt.pass..'</th><th>BAUD = '..vt.baud..'</th>'
..'<th>Refresh = '..vt.rfh..'</th>' --</tr>'
..'</table><br>'
end
return LB0
