On Wed, 09 Apr 2014 08:53:19 -0500, Mark H Harris wrote:
> On 4/8/14 3:09 PM, Grawburg wrote:
>
>> I have a N/O pushbutton that I want to "latch" a value to a variable
>> when it's been pressed.
>> I need button_value to become '1' when the button is pressed and to
>> remain '1' until ...
>
>> What do I use to 'latch' button_value?
>
> Philosophically speaking buttons don't latch. You push the button, an
> event is generated, and the call-back handles the event to do something
> in your project.
>
> You might try setting a global variable on the button-push event.
>
> Or, if I understand you, you might want to use a configurable, like a
> radio button or a check box, either of which are designed to be
> "latched".
>
>
> marcus
How familiar are you with oop?
a class would sort this quite nicely
Class Button(object)
def __init__(self,bit):
self.pressed=False:
self.bit=bit
def check_button(self):
if bus.read_byte_data(bit):
self.pressed=True
button=Button(address.GPIOB)
while not button.pressed:
button.check button()
once button.pressed has been set True it will remain True until you reset
it with button.pressed=False
+ with a bit of tweaking you should be able to create multiple button
objects for each switch you connect
*note this code has been typed direct & not tested so may contain minor
errors.
--
Imbalance of power corrupts and monopoly of power corrupts absolutely.
-- Genji
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