ESP8266 Community Forum

- Wed May 27, 2015 11:56 pm #18691

Moin,

IMHO lua is mostly a glue or prototype language.
If you identify proper functions that need speed, encode them in c and call them from lua.

My € 0,02 cents,
Cal

Don't want to hijack but can you point me to an example call to C routine?

All lua modules can be taken as an example. "app/modules". Nearly all of luas functionality is written in c.
If you want to get started understanding the interface the following may help.

viewtopic.php?f=24&t=2526
I had fun writing that.
Leave a note if you found it useful.

Cal

Get your modules here:

https://www.banggood.com/custlink/KvGGhGF4wG

- Fri Jun 12, 2015 7:12 pm #20304 I haven't found the time for more investigation until now but i have found a solution:

Original code from the first post)

Code: Select allfunction forwardandrewind()
      if(forward == 1) then
         forward = 0
         gpio.write(3,gpio.HIGH)
      else
         forward = 1
         gpio.write(3,gpio.LOW)
      end
         
      for x=1,16000 do
         gpio.write(4,gpio.HIGH)
         tmr.delay(1)
         gpio.write(4,gpio.LOW)
         tmr.delay(1)
         tmr.wdclr()
      end
      tmr = nil

      print(node.heap())
   end

I found the problem with this code its the tmr.wdclr() when called to often it leaks hell of memory instead it should only be called when needed.

example)

Code: Select allfunction forwardandrewind()
      if(forward == 1) then
         forward = 0
         gpio.write(3,gpio.HIGH)
      else
         forward = 1
         gpio.write(3,gpio.LOW)
      end
         
      for x=1,16000 do
         gpio.write(4,gpio.HIGH)
         tmr.delay(1)
         gpio.write(4,gpio.LOW)
         tmr.delay(1)
         if(x%1000) then
              tmr.wdclr()
         end
      end
      tmr = nil

      print(node.heap())
   end

Here i substitute the
tmr.wdclr()
with
if(x%1000) then
tmr.wdclr()
end

and now it do not leak memory anymore....

So if someone else doing this foolish mistake then you got the solution for it

- Sat Jun 13, 2015 2:11 am #20317 It would be nice if you could open an issue about tmr.wdclr() memory leakage so it can be addressed.

Thanks for your information,
Cal

Get your modules here:

https://www.banggood.com/custlink/KvGGhGF4wG

- Sat Jun 13, 2015 7:16 am #20351 Don't know where to do it, do i do it in this forum under Bug Reports?

I added a issue there regarding this, but i am not sure if it is that you meant?