Merge #444

444: nrf: add NVMC driver. r=lulf a=Dirbaio

I haven't implemented `embassy_traits::Flash` because I want to change it to match embedded_storage, which is much better designed. 

Either way, NVMC can't do async anyway, so the best we could do is implementing the async trait in a blocking way...

Co-authored-by: Dario Nieuwenhuis <[email protected]>

2 files changed, 45 insertions, 0 deletions

diff --git a/examples/nrf/Cargo.toml b/examples/nrf/Cargo.toml
index b71dfa0d4..b89aa513f 100644
--- a/examples/nrf/Cargo.toml
+++ b/examples/nrf/Cargo.toml
@@ -30,3 +30,4 @@ embedded-hal    = "0.2.6"
 panic-probe = { version = "0.2.0", features = ["print-defmt"] }
 futures = { version = "0.3.17", default-features = false, features = ["async-await"] }
 rand = { version = "0.8.4", default-features = false }
+embedded-storage = "0.2.0"
diff --git a/examples/nrf/src/bin/nvmc.rs b/examples/nrf/src/bin/nvmc.rs
new file mode 100644
index 000000000..f36895636
--- /dev/null
+++ b/examples/nrf/src/bin/nvmc.rs
@@ -0,0 +1,44 @@
+#![no_std]
+#![no_main]
+#![feature(type_alias_impl_trait)]
+
+#[path = "../example_common.rs"]
+mod example_common;
+use embassy::executor::Spawner;
+use embassy::time::{Duration, Timer};
+use embassy_nrf::nvmc::Nvmc;
+use embassy_nrf::Peripherals;
+use embedded_storage::nor_flash::{NorFlash, ReadNorFlash};
+use example_common::*;
+
+#[embassy::main]
+async fn main(_spawner: Spawner, p: Peripherals) {
+    info!("Hello NVMC!");
+
+    // probe-run breaks without this, I'm not sure why.
+    Timer::after(Duration::from_secs(1)).await;
+
+    let mut f = Nvmc::new(p.NVMC);
+    const ADDR: u32 = 0x80000;
+
+    info!("Reading...");
+    let mut buf = [0u8; 4];
+    unwrap!(f.read(ADDR, &mut buf));
+    info!("Read: {=[u8]:x}", buf);
+
+    info!("Erasing...");
+    unwrap!(f.erase(ADDR, ADDR + 4096));
+
+    info!("Reading...");
+    let mut buf = [0u8; 4];
+    unwrap!(f.read(ADDR, &mut buf));
+    info!("Read: {=[u8]:x}", buf);
+
+    info!("Writing...");
+    unwrap!(f.write(ADDR, &[1, 2, 3, 4]));
+
+    info!("Reading...");
+    let mut buf = [0u8; 4];
+    unwrap!(f.read(ADDR, &mut buf));
+    info!("Read: {=[u8]:x}", buf);
+}