Please see the post at https://deskthority.net/keyboards-f2/tmk-firmware-for-xt-keyboards-t13847.htmlmaster
#define XT_DATA_BIT 0 | #define XT_DATA_BIT 0 | ||||
#define XT_INT_INIT() do { \ | #define XT_INT_INIT() do { \ | ||||
EICRA |= ((1<<ISC11) | \ | EICRA |= ((1<<ISC11) | \ | ||||
(0<<ISC10)); \ | |||||
(1<<ISC10)); \ | |||||
} while (0) | } while (0) | ||||
#define XT_INT_ON() do { \ | #define XT_INT_ON() do { \ | ||||
EIMSK |= (1<<INT1); \ | EIMSK |= (1<<INT1); \ |