stm32f4 key external interrupt

[Jython]

HI, ALL!
  I want to implement a key function, have coded some like
https://gist.github.com/goog/5e5b484430328d3c1153b474ce147079
using the 'stm32f4_gpio_set_config' and register settings , but does not
work either, so hope some guy could give me some guide!
thanks!
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