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   REPLYADDR peter.heitzer@rz.uni-regensburg.de   
   REPLYTO 3:770/3.0 UUCP   
   MSGID:  fe61dc82   
   REPLY: <4sqasihspiggr57t75cdtscmemttglrhs9@4ax.com> 9619ba18   
   PID: SoupGate-Win32 v1.05   
   john larkin  wrote:   
   >On 8 Feb 2024 08:10:20 GMT, "Peter Heitzer"   
   > wrote:   
      
   >>john larkin  wrote:   
   >>>Has anyone measured how fast a pico can do things running Python?   
   >>>Like, to start, wiggling a port pin as fast as possible?   
   >>   
   >>>I think the micro Python is an interpreter.   
   >>Yes, Python is interpreted.   
   >>I found https://wellys.com/posts/board-language_speed/   
   >>I think the performance of Micropython and Circuitpython should be   
   >>almost equal.   
   >>The nice thing is that you can test your code interactively in the   
   >>Python interpreter.   
      
   >Cool. We just did a MicroPython loop to raise and lower a port pin 4   
   >times, brute force inline code, as fast as we could. One up/down cycle   
   >takes about 14 microseconds on a Pico, with some jitter.   
      
   >We'll repeat it in c. I'm guessing that will be 20x faster.   
   I did a quick test yesterday evening using this few lines of code:   
      
   from machine import Pin   
   led=Pin(0,Pin.OUT)   
   switch=Pin(1,Pin.IN,Pin.PULL_UP)   
   while switch.value(): led.toggle()   
      
   GPIO0 was an output driving a LED. On GPIO1 I connected a momentary switch   
   to ground. On the output pin I got about 41 kHz until the switch was   
   pressed. With an endless loop:   
   while True: led.toggle()   
   I got 83 kHz.   
   I used Micropython v. 1.20; the Pico run at 125 MHz.   
   I also noticed some jitter. Normally one would not create a rectangle signal   
   this way but use a PWM channel for that task.   
      
   --   
   Dipl.-Inform(FH) Peter Heitzer, peter.heitzer@rz.uni-regensburg.de   
      
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