-spec clock_get_ticks_per_second() -> integer().

Gets the number of clock ticks per second configured for the application.

Reference: rtems_clock_get_ticks_per_second

-spec clock_get_ticks_since_boot() -> integer().

Gets the number of clock ticks since some time point during the system initialization or the last overflow of the clock tick counter.

Reference: rtems_clock_get_ticks_since_boot

-spec clock_get_tod() -> time_of_day().

Gets the time of day associated with the current CLOCK_REALTIME.

Reference: rtems_clock_get_tod

-spec clock_set(time_of_day()) -> integer().

Sets the CLOCK_REALTIME to the time of day.

Reference: rtems_clock_set

-spec pwrite(binary() | iolist(), binary() | iolist(), integer()) ->
                {ok, integer()} | {error, atom(), list()}.

Perform a raw pwrite syscall to a device.

The function is approximately equivalent to the C code:

fd = open(device_path, O_RDWR);
pwrite(fd, buffer.data, buffer.size, offset);copy

Reference: pwrite

-spec unmount(iodata()) -> ok | {error, list()}.

Unmounts the file system instance at the specified mount path.

Reference: rtems_unmount