Struct capsules_core::button::Button

pub struct Button<'a, P: InterruptPin<'a>> { /* private fields */ }

Manages the list of GPIO pins that are connected to buttons and which apps are listening for interrupts from which buttons.

Implementations

impl<'a, P: InterruptPin<'a>> Button<'a, P>

pub fn new( pins: &'a [(&'a InterruptValueWrapper<'a, P>, ActivationMode, FloatingState)], grant: Grant<App, UpcallCount<1>, AllowRoCount<0>, AllowRwCount<0>> ) -> Self

Trait Implementations

impl<'a, P: InterruptPin<'a>> ClientWithValue for Button<'a, P>

fn fired(&self, pin_num: u32)

impl<'a, P: InterruptPin<'a>> SyscallDriver for Button<'a, P>

fn command( &self, command_num: usize, data: usize, _: usize, processid: ProcessId ) -> CommandReturn

Configure interrupts and read state for buttons.

data is the index of the button in the button array as passed to Button::new().

All commands greater than zero return INVAL if an invalid button number is passed in.

command_num

• 0: Driver existence check and get number of buttons on the board.
• 1: Enable interrupts for a given button. This will enable both press and depress events.
• 2: Disable interrupts for a button. No affect or reliance on registered callback.
• 3: Read the current state of the button.

fn allocate_grant(&self, processid: ProcessId) -> Result<(), Error>

Request to allocate a capsule’s grant for a specific process.

fn allow_userspace_readable( &self, app: ProcessId, which: usize, slice: ReadWriteProcessBuffer ) -> Result<ReadWriteProcessBuffer, (ReadWriteProcessBuffer, ErrorCode)>

System call for a process to pass a buffer (a UserspaceReadableProcessBuffer) to the kernel that the kernel can either read or write. The kernel calls this method only after it checks that the entire buffer is within memory the process can both read and write.