1 files changed, 84 insertions, 0 deletions

diff --git a/examples/nrf/src/bin/qspi.rs b/examples/nrf/src/bin/qspi.rs
new file mode 100644
index 000000000..6e49887a4
--- /dev/null
+++ b/examples/nrf/src/bin/qspi.rs
@@ -0,0 +1,84 @@
+#![no_std]
+#![no_main]
+#![feature(min_type_alias_impl_trait)]
+#![feature(impl_trait_in_bindings)]
+#![feature(type_alias_impl_trait)]
+#![allow(incomplete_features)]
+
+#[path = "../example_common.rs"]
+mod example_common;
+
+use defmt::{assert_eq, panic};
+use embassy::executor::Spawner;
+use embassy::traits::flash::Flash;
+use embassy_nrf::Peripherals;
+use embassy_nrf::{interrupt, qspi};
+use example_common::*;
+
+const PAGE_SIZE: usize = 4096;
+
+// Workaround for alignment requirements.
+// Nicer API will probably come in the future.
+#[repr(C, align(4))]
+struct AlignedBuf([u8; 4096]);
+
+#[embassy::main]
+async fn main(_spawner: Spawner, p: Peripherals) {
+    // Config for the MX25R64 present in the nRF52840 DK
+    let mut config = qspi::Config::default();
+    config.read_opcode = qspi::ReadOpcode::READ4IO;
+    config.write_opcode = qspi::WriteOpcode::PP4IO;
+    config.write_page_size = qspi::WritePageSize::_256BYTES;
+
+    let irq = interrupt::take!(QSPI);
+    let mut q = qspi::Qspi::new(
+        p.QSPI, irq, p.P0_19, p.P0_17, p.P0_20, p.P0_21, p.P0_22, p.P0_23, config,
+    )
+    .await;
+
+    let mut id = [1; 3];
+    q.custom_instruction(0x9F, &[], &mut id).await.unwrap();
+    info!("id: {}", id);
+
+    // Read status register
+    let mut status = [4; 1];
+    q.custom_instruction(0x05, &[], &mut status).await.unwrap();
+
+    info!("status: {:?}", status[0]);
+
+    if status[0] & 0x40 == 0 {
+        status[0] |= 0x40;
+
+        q.custom_instruction(0x01, &status, &mut []).await.unwrap();
+
+        info!("enabled quad in status");
+    }
+
+    let mut buf = AlignedBuf([0u8; PAGE_SIZE]);
+
+    let pattern = |a: u32| (a ^ (a >> 8) ^ (a >> 16) ^ (a >> 24)) as u8;
+
+    for i in 0..8 {
+        info!("page {:?}: erasing... ", i);
+        q.erase(i * PAGE_SIZE).await.unwrap();
+
+        for j in 0..PAGE_SIZE {
+            buf.0[j] = pattern((j + i * PAGE_SIZE) as u32);
+        }
+
+        info!("programming...");
+        q.write(i * PAGE_SIZE, &buf.0).await.unwrap();
+    }
+
+    for i in 0..8 {
+        info!("page {:?}: reading... ", i);
+        q.read(i * PAGE_SIZE, &mut buf.0).await.unwrap();
+
+        info!("verifying...");
+        for j in 0..PAGE_SIZE {
+            assert_eq!(buf.0[j], pattern((j + i * PAGE_SIZE) as u32));
+        }
+    }
+
+    info!("done!")
+}