Type Alias saul_write_t

pub type saul_write_t = Option<unsafe extern "C" fn(dev: *const c_void, data: *const phydat_t) -> c_int>;

@brief Write a value (a set of values) to a device

Most sensors will probably just return -ENOTSUP, as writing values to a sensor is often without purpose. The interface can however be used to configure sensors, e.g. to switch a sensor’s unit type by writing the newly selected type to it.

For actuators this function is used to influence the actuators state, e.g. switching a switch or setting the speed of a motor.

@param[in] dev device descriptor of the target device @param[in] data data to write to the device

@return number of values actually processed by the device [1-3] @return -ENOTSUP if the device does not support this operation @return -ECANCELED on other errors

Aliased Type

enum saul_write_t {
    None,
    Some(unsafe extern "C" fn(_: *const c_void, _: *const phydat_t) -> i32),
}

Variants

None

No value.

Some(unsafe extern "C" fn(_: *const c_void, _: *const phydat_t) -> i32)

Some value of type T.

Layout

Note: Most layout information is completely unstable and may even differ between compilations. The only exception is types with certain repr(...) attributes. Please see the Rust Reference's “Type Layout” chapter for details on type layout guarantees.

Size: 4 bytes

Size for each variant:

• None: 0 bytes
• Some: 4 bytes