Struct capsules_extra::seven_segment::SevenSegmentDriver

pub struct SevenSegmentDriver<'a, P: Pin, A: Alarm<'a>, const NUM_DIGITS: usize> { /* private fields */ }

Holds an array of digits and an array of segments for each digit.

Implementations

impl<'a, P: Pin, A: Alarm<'a>, const NUM_DIGITS: usize> SevenSegmentDriver<'a, P, A, NUM_DIGITS>

pub fn new( segments: &'a [&'a P; 8], digits: &'a [&'a P; NUM_DIGITS], buffer: &'a mut [u8; NUM_DIGITS], alarm: &'a A, segment_activation: ActivationMode, digit_activation: ActivationMode, refresh_rate: usize, ) -> Self

pub fn init(&self)

Initialize the digit and segment pins. Does not override pins if they have already been initialized for another driver.

pub fn digits_len(&self) -> usize

Returns the number of digits on the display.

Trait Implementations

impl<'a, P: Pin, A: Alarm<'a>, const NUM_DIGITS: usize> AlarmClient for SevenSegmentDriver<'a, P, A, NUM_DIGITS>

fn alarm(&self)

Callback indicating the alarm time has been reached. The alarm MUST be disabled when this is called. If a new alarm is needed, the client can call Alarm::set_alarm.

impl<'a, P: Pin, A: Alarm<'a>, const NUM_DIGITS: usize> SyscallDriver for SevenSegmentDriver<'a, P, A, NUM_DIGITS>

fn command( &self, command_num: usize, data1: usize, data2: usize, _: ProcessId, ) -> CommandReturn

Control the digit display.

command_num

• 0: Driver existence check.
• 1: Prints one digit at the requested position. Returns INVAL if the position is not valid.
• 2: Clears all digits currently being displayed.
• 3: Print a dot at the requested digit position. Returns INVAL if the position is not valid.
• 4: Print a custom pattern for a certain digit. Returns INVAL if the position is not valid.
• 5: Returns the number of digits on the display. This will always be 0 or greater, and therefore also allows for checking for this driver.

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.