Struct capsules_core::led::LedDriver

pub struct LedDriver<'a, L: Led, const NUM_LEDS: usize> { /* private fields */ }

Holds the array of LEDs and implements a Driver interface to control them.

Implementations

impl<'a, L: Led, const NUM_LEDS: usize> LedDriver<'a, L, NUM_LEDS>

pub fn new(leds: &'a [&'a L; NUM_LEDS]) -> Self

Trait Implementations

impl<L: Led, const NUM_LEDS: usize> SyscallDriver for LedDriver<'_, L, NUM_LEDS>

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

Control the LEDs.

command_num

• 0: Returns the number of LEDs on the board. This will always be 0 or greater, and therefore also allows for checking for this driver.
• 1: Turn the LED at index specified by data on. Returns INVAL if the LED index is not valid.
• 2: Turn the LED at index specified by data off. Returns INVAL if the LED index is not valid.
• 3: Toggle the LED at index specified by data on or off. Returns INVAL if the LED index is not valid.

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.