Add support to 'listen' for tags #37
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This adds support to break the `read_passive_target` function up into two parts if desired. First tell the PN532 to listen for tags, and then explicitly ask to read the UID from the tag. This can be useful when trying to simultaneously scan tags and run timing sensitive code, like updating neopixels, and don't want to wait for the timeout delay of `read_passive_target`.
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I will test out the code from this PR this week. |
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@FoamyGuy wow thanks! |
FoamyGuy
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Aug 19, 2020
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I tested this out with the included pn532_simplelisten.py on an Itsy Bitsy M0 and it is working successfully. With the IRQ pin hooked up to a DigitalInOut we are now able to check if a card is present before trying to read it.
I also tested the existing simpletest and it is still working as intended for me as well.
ladyada
approved these changes
Aug 19, 2020
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nice! |
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You are welcome. And thank you as well @dunkmann00, this functionality is a great addition that allows the PN532 to be more easily used in complex / interesting projects. I appreciate you working on this and adding it to the Library. |
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This adds support to break the
read_passive_targetfunction up into two parts if desired. First tell the PN532 to listen for tags, and then explicitly ask to read the UID from the tag. This can be useful when trying to simultaneously scan tags and run timing sensitive code, like updating neopixels, and don't want to wait for the timeout delay ofread_passive_target.This addresses #36.