[Microbit-Python] error code?... :(020

[Larry Hastings]

I wish to understand this more.  Micropython has an internal, 
hidden-from-view, event queue?  How do I examine and interact with it?

I thought button_a.is_pressed() was polling; is it watching for button 
events on this event queue?  Does that imply that I can get delayed / 
buffered button presses?

In general how do I keep the event queue from filling?


//arry/

On 09/23/2015 01:54 PM, Damien George wrote:
> Hi Alan,
>
> Error code 020 is "out of memory".
>
> The problem is as you guessed: there is an event put on the event
> queue each time the button is pressed.  To clear this queue your code
> needs to "yield".  You can do this by putting sleep(1) in your loop.
>
> This is totally unexpected behaviour and I'll work out how to fix it
> (Ie your code should just work).
>
> Cheers,
> Damien.
>
>
>
> On Wed, Sep 23, 2015 at 4:02 AM, Alan <alainjackson at hotmail.com> wrote:
>> Error code update.
>>
>> I'm consistently getting the ":( 020" code after 42 button presses (of any
>> combination of buttons A and B).
>>
>> Is there a button click buffer that's overflowing somewhere? If there is I
>> can't see a method on the microbit API to clear it.
>>
>> Cheers,
>>
>> Alan
>>
>> ________________________________
>> From: alainjackson at hotmail.com
>> To: microbit at python.org
>> Date: Wed, 23 Sep 2015 00:28:51 +0000
>> Subject: [Microbit-Python] error code?... :(020
>>
>>
>> Hi,
>>
>> I wrote a small program to draw on the LED matrix, but after setting a few
>> LEDs on I get what looks like an error message on the LEDs:
>>
>> ":(020"
>>
>> (Frowny-face zero two zero)
>>
>> It just keeps repeating that and my program stops but there's no stack trace
>> on the python repl.
>>
>> Is that a built in hardware error code or something? Has anyone else seen
>> that?
>>
>> Here's my program:
>>
>> ====8<====
>>
>> from microbit import *
>>
>> index = 0
>>
>> while True:
>>      if button_a.is_pressed():
>>          x = index % 5
>>          y = int(index / 5)
>>          display.image.set_pixel_value(x,y,
>> not(display.image.get_pixel_value(x,y)))
>>
>>      if button_b.is_pressed():
>>          index = (index + 1) % 25
>>
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