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Testing notes - Raspi vs x86 and SPI vs USB-based PN532 readers

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Ondrej Mikle 2018-07-25 23:56:20 +02:00
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@ -168,3 +168,16 @@ See an [example of HCE NDEF emulation](https://github.com/TechBooster/C85-Androi
You could just modify `write_signed_ndef_on_desfire.py` to write out the JSON into a file and then put the
generated NDEF file into application so it will respond with it when
## Testing
If you don't want to test it on Raspberry directly, it's possible to run on x86 with USB-based PN532, e.g.
[ACR 122U](https://www.acs.com.hk/en/products/3/acr122u-usb-nfc-reader/) or
[ACR 122T](https://www.acs.com.hk/en/products/109/acr122t-usb-tokens-nfc-reader/).
Open/close switch can be simulated by ordinary file, for unlocker you can use do-nothing `unlocker.Unlocker` class.
Note that there are subtle differences in PN532 handling which we also discovered only by experience, notably that SPI
version cannot do interrupts while the USB version can. This has the effect that it causes 100% CPU use on SPI version,
because it actively polls, while it works on USB version without 100% CPU usage. This issue has been fixed in the past
so that the SPI version doesn't consume 100% CPU by just waiting for card.