[−][src]Struct gpio_cdev::MultiLineHandle
Handle for interacting with a "requested" line
In order for userspace to read/write the value of a GPIO
it must be requested from the chip using Line::request
.
On success, the kernel creates an anonymous file descriptor
for interacting with the requested line. This structure
is the go-between for callers and that file descriptor.
Methods
impl MultiLineHandle
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pub fn get_values(&self) -> Result<Vec<u8>>
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Request the current state of this Line from the kernel
This call is expected to succeed for both input and output lines. It should be noted, however, that some drivers may not be able to give any useful information when the value is requested for an output line.
This value should be 0 or 1 which a "1" representing that the line is active. Usually this means that the line is at logic-level high but it could mean the opposite if the line has been marked as being ACTIVE_LOW.
pub fn set_values(&self, values: &[u8]) -> Result<()>
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Request that the line be driven to the specified value
The value should be 0 or 1 with 1 representing a request to make the line "active". Usually "active" means logic level high unless the line has been marked as ACTIVE_LOW.
Calling set_value
on a line that is not an output will
likely result in an error (from the kernel).
pub fn num_lines(&self) -> usize
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Get the number of lines associated with this handle
pub fn lines(&self) -> &Lines
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Get the Line information associated with this handle.
Trait Implementations
impl Debug for MultiLineHandle
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impl AsRawFd for MultiLineHandle
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Auto Trait Implementations
impl Send for MultiLineHandle
impl Sync for MultiLineHandle
Blanket Implementations
impl<T> From<T> for T
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impl<T, U> Into<U> for T where
U: From<T>,
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U: From<T>,
impl<T, U> TryFrom<U> for T where
U: Into<T>,
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U: Into<T>,
type Error = Infallible
The type returned in the event of a conversion error.
fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>
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impl<T, U> TryInto<U> for T where
U: TryFrom<T>,
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U: TryFrom<T>,
type Error = <U as TryFrom<T>>::Error
The type returned in the event of a conversion error.
fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>
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impl<T> BorrowMut<T> for T where
T: ?Sized,
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T: ?Sized,
fn borrow_mut(&mut self) -> &mut T
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impl<T> Borrow<T> for T where
T: ?Sized,
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T: ?Sized,
impl<T> Any for T where
T: 'static + ?Sized,
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T: 'static + ?Sized,