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nrf/spim: share code between blocking+async.

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This commit is contained in:
Dario Nieuwenhuis
2022-01-13 19:27:10 +01:00
parent 167af01211
commit 7086642ce4
2 changed files with 89 additions and 142 deletions
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22
embassy-nrf/src/util.rs
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@ -1,16 +1,28 @@
use core::mem;
const SRAM_LOWER: usize = 0x2000_0000;
const SRAM_UPPER: usize = 0x3000_0000;
// TODO: replace transmutes with core::ptr::metadata once it's stable
pub(crate) fn slice_ptr_parts<T>(slice: *const [T]) -> (usize, usize) {
unsafe { mem::transmute(slice) }
}
pub(crate) fn slice_ptr_parts_mut<T>(slice: *mut [T]) -> (usize, usize) {
unsafe { mem::transmute(slice) }
}
/// Does this slice reside entirely within RAM?
pub(crate) fn slice_in_ram<T>(slice: &[T]) -> bool {
let ptr = slice.as_ptr() as usize;
ptr >= SRAM_LOWER && (ptr + slice.len() * core::mem::size_of::<T>()) < SRAM_UPPER
pub(crate) fn slice_in_ram<T>(slice: *const [T]) -> bool {
let (ptr, len) = slice_ptr_parts(slice);
ptr >= SRAM_LOWER && (ptr + len * core::mem::size_of::<T>()) < SRAM_UPPER
}
/// Return an error if slice is not in RAM.
#[cfg(not(feature = "nrf51"))]
pub(crate) fn slice_in_ram_or<T, E>(slice: &[T], err: E) -> Result<(), E> {
if slice.is_empty() || slice_in_ram(slice) {
pub(crate) fn slice_in_ram_or<T, E>(slice: *const [T], err: E) -> Result<(), E> {
if slice_in_ram(slice) {
Ok(())
} else {
Err(err)