nrf: add SPIM

embassy-nrf/src/lib.rs

@@ -49,6 +49,45 @@ pub use nrf52833_hal as hal;
 #[cfg(feature = "52840")]
 pub use nrf52840_hal as hal;
 
+/// Length of Nordic EasyDMA differs for MCUs
+#[cfg(any(
+    feature = "52810",
+    feature = "52811",
+    feature = "52832",
+    feature = "51"
+))]
+pub mod target_constants {
+    // NRF52832 8 bits1..0xFF
+    pub const EASY_DMA_SIZE: usize = 255;
+    // Easy DMA can only read from data ram
+    pub const SRAM_LOWER: usize = 0x2000_0000;
+    pub const SRAM_UPPER: usize = 0x3000_0000;
+}
+#[cfg(any(feature = "52840", feature = "52833", feature = "9160"))]
+pub mod target_constants {
+    // NRF52840 and NRF9160 16 bits 1..0xFFFF
+    pub const EASY_DMA_SIZE: usize = 65535;
+    // Limits for Easy DMA - it can only read from data ram
+    pub const SRAM_LOWER: usize = 0x2000_0000;
+    pub 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 >= target_constants::SRAM_LOWER && (ptr + slice.len()) < target_constants::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)
+    }
+}
+
 // This mod MUST go first, so that the others see its macros.
 pub(crate) mod fmt;
 pub(crate) mod util;
@@ -59,4 +98,5 @@ pub mod interrupt;
 #[cfg(feature = "52840")]
 pub mod qspi;
 pub mod rtc;
+pub mod spim;
 pub mod uarte;