ThomasChr

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• Float Speed Espruino Pico VS Pyboard

  @ThomasChr started

  • 7 comments
  • 5,647 views

  @asez73 replied
• Float Speed Espruino Pico VS Pyboard

  in General • 6 years, 12 months

  

  Hello Forum,

  this little test may neither be fair nor exact but i still wonder about the outcome...

  The Leibniz Formula is a little float Problem for calculating Pi.

  I wrote the code in Python and Javascript and let it run on the PyBoard and the Espruino Pico.

  Here‘s the Python-Code:

  import time
  
  iterations = 1000000
  
  x = 1
  pi = 1
  start = time.time()
  for i in range(2, iterations + 2):
     x = x * -1
     pi = pi + (x / (2*i-1))
  
  pi = pi * 4
  print('Pi: ' + str(pi))
  end = time.time()
  print('Time taken for ' + str(iterations) + ' Iterations: ' + str((end - start)*1000000) + ' Mikroseconds')
  

  And here‘s the „same“ in Javascript:

  var iterations = 1000000;
  
  var x = 1;
  var pi = 1;
  var begin=Date.now();
  for (i = 2; i < iterations + 2; i++) {
    x = x * -1;
    pi = pi + (x / (2*i-1));    
  }
  
  pi = pi * 4;
  console.log('Pi: ' + pi);
  var end= Date.now();
  console.log('Took ' + ((end-begin)*1000) + ' Microseconds');
  

  On the PyBoard the code took 26 seconds to execute, the Pico took 458 seconds.

  I‘m a little puzzled of the outcome because I though both boards have floating point hardware, or am I wrong?

  Can anyone explain the massive speed difference to me?

  Thomas

  PS: I know that this synthetic benchmark has nothing to do with overall speed, I just want to understand why these numbers are what they are in this particular case.

• Port for Arduino Due?

  @ThomasChr started

  • 28 comments
  • 10,409 views

  @Gordon replied
• Port for Arduino Due?

  in Porting to new Devices • 7 years, 2 months

  

  Hey Gordon, thats great news!

  I'm not that into Social Media, but @DieSchatzjger is my not so often used Twitter Account :-)

  Thomas

• Gordon will be away until 2nd October

  in News • 7 years, 2 months

  

  @Gordon: Take your time. Espruino is great, but having a son is so much more :-)

• Port for Arduino Due?

  in Porting to new Devices • 7 years, 2 months

  

  I've made a PR to discuss my code: https://github.com/espruino/Espruino/pull/1255

  The large lib is not a problem of code size on the due. It's ~250 MBs of Code in the Espruino Repo.

• Port for Arduino Due?

  in Porting to new Devices • 7 years, 2 months

  

  Hi Gordon!

  I think the code is kind of ready - setWatch is missing, also PWM, ADC and more UARTs - so a few things are left to do.

  But the included library is large (and also does include some manuals), so I think first I need to tidy up a little bit.

  Thomas

• Port for Arduino Due?

  in Porting to new Devices • 7 years, 2 months

  

  So... 'save()' is working now. It's not super reliable though. I think I need to make some debugging.
  Systemtime does now work down to the millisecond and has no overflow after 40 days any more...

• Port for Arduino Due?

  in Porting to new Devices • 7 years, 2 months

  

  We now have access to all pins (I counted 63 Pins - impressive) and the SystemTimer for setInterval() and setTimeout() is working - kind of. Not very accuracte. I'm on it.

  If someone wants to have a go, here are the Bin-Files: https://www.thomaschristlieb.de/wp-content/uploads/2017/09/espruinoduebin.tar.gz

  I think after getting a real accurate Time (better than one Second!) I'm trying to get save() to Work...

• Port for Arduino Due?

  in Porting to new Devices • 7 years, 3 months

  

  I've got a REPL, I've got Pin Functions (Config, Get, Set) for the first Pin (the onboard LED). I think we can call it Alpha Status :-)

  Next would be to get the setTimeout running by implementing jshGetSystemTime with the build-in RTC. Then I need to enter all possible pins (all 54!) and make the Pin Functions for them.

  Thats a lot of work, but not very complicated anymore.