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12fef1b196
Since GPIO manipulations may cause stray INT0 activity, we turn off INT0 handing on ATUSB_GPIO. The MCU must be reset to restore access to INT0. There are still issues to resolve with the GPIO test. It may turn out that there's a less invasive solution than just turning off INT0 completely. - board_app.c (gpio): mask INT0 before manipulating GPIOs - board_app.c (board_app_init): make it clearer that EIMSK is a bit mask