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qmk_firmware/keyboards/handwired/splittest/teensy_2/teensy_2.c

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#include QMK_KEYBOARD_H
bool is_keyboard_master(void) {
// TODO: replace this override once USB host detection is implemented
// SPLIT_HAND_PIN Combined with MASTER_LEFT or MASTER_RIGHT, gives a crude
// way to force teensy to run as slave/master
setPinInput(SPLIT_HAND_PIN);
#if defined(MASTER_RIGHT)
return !readPin(SPLIT_HAND_PIN);
#else
return readPin(SPLIT_HAND_PIN);
#endif
}