nrf: add support for nrf52805, nrf52811, nrf52820

embassy-nrf/src/util.rs

@@ -0,0 +1,18 @@
+const SRAM_LOWER: usize = 0x2000_0000;
+const SRAM_UPPER: usize = 0x3000_0000;
+
+/// Does this slice reside entirely within RAM?
+pub(crate) fn slice_in_ram(slice: &[u8]) -> bool {
+    let ptr = slice.as_ptr() as usize;
+    ptr >= SRAM_LOWER && (ptr + slice.len()) < SRAM_UPPER
+}
+
+/// Return an error if slice is not in RAM.
+#[cfg(not(feature = "51"))]
+pub(crate) fn slice_in_ram_or<T>(slice: &[u8], err: T) -> Result<(), T> {
+    if slice.len() == 0 || slice_in_ram(slice) {
+        Ok(())
+    } else {
+        Err(err)
+    }
+}