Buttons

Reading button state

There are two functions which can be used to read the button state: btnState() and btnStateDebounced(), it is recommended to use btnStateDebounced() unless you wish to implement your own debouncing logic. Debouncing ensures you won't get phantom keypresses while the signals settle into a consistent state after pressing a button. The default debouncing logic keeps polling the buttons until they have been in a consistent state for 5ms.

Testing for a specific key press

The aforementioned functions return a uint32_t with specific bits set for each button. One can test for a specific button being pressed by using a bitwise & on the result of the function.

For example:

uint32_t buttons = btnStateDebounced();
if((buttons & A) || (buttons & B)) {
  printf("Button A or B was pressed");
}

The following buttons are available (note, the joystick is digital and behaves as if it were a series of buttons representing each direction - the F200 has no diagonals): A, B, X, Y, START, SELECT, UP, DOWN, LEFT, RIGHT, UP_LEFT, UP_RIGHT, DOWN_LEFT, DOWN_RIGHT, VOL_UP, VOL_DOWN, STICK, L, R