Button#

BUTTON_PRESSED#

#define BUTTON_PRESSED

1

Button state is pressed.

BUTTON_RELEASED#

#define BUTTON_RELEASED

0

Button state is released.

halInternalInitButton#

void halInternalInitButton (void )

Initializes the buttons.

This function is automatically called by halInit().

halButtonState#

uint8_t halButtonState (uint8_t button)

Returns the current state (pressed or released) of a button.

Note

• This function is correlated with halButtonIsr() and so returns the shadow state rather than reading the actual state of the pin.

Returns

• BUTTON_PRESSED if the button is pressed or BUTTON_RELEASED if the button is not pressed.

halButtonPinState#

uint8_t halButtonPinState (uint8_t button)

Returns the current state (pressed or released) of the pin associated with a button.

This reads the actual state of the pin and can be used on startup to determine the initial position of the buttons.

Returns

• BUTTON_PRESSED if the button is pressed or BUTTON_RELEASED if the button is not pressed.

halButtonIsr#

void halButtonIsr (uint8_t button, uint8_t state)

A callback called in interrupt context whenever a button changes its state.

Must be implemented by the application. This function should contain the functionality to be executed in response to changes of state in each of the buttons, or callbacks to the appropriate functionality.