Add flash example & flash HIL test

tests/rp/src/bin/flash.rs

@@ -0,0 +1,48 @@
+#![no_std]
+#![no_main]
+#![feature(type_alias_impl_trait)]
+
+use defmt::*;
+use embassy_executor::Spawner;
+use embassy_rp::flash::{ERASE_SIZE, FLASH_BASE};
+use embedded_storage::nor_flash::{NorFlash, ReadNorFlash};
+use {defmt_rtt as _, panic_probe as _};
+
+const ADDR_OFFSET: u32 = 0x4000;
+
+#[embassy_executor::main]
+async fn main(_spawner: Spawner) {
+    let p = embassy_rp::init(Default::default());
+    info!("Hello World!");
+
+    let mut flash = embassy_rp::flash::Flash::<_, { 2 * 1024 * 1024 }>::new(p.FLASH);
+
+    let mut buf = [0u8; ERASE_SIZE];
+    defmt::unwrap!(flash.read(ADDR_OFFSET, &mut buf));
+
+    info!("Addr of flash block is {:x}", ADDR_OFFSET + FLASH_BASE as u32);
+    info!("Contents start with {=[u8]}", buf[0..4]);
+
+    defmt::unwrap!(flash.erase(ADDR_OFFSET, ADDR_OFFSET + ERASE_SIZE as u32));
+
+    defmt::unwrap!(flash.read(ADDR_OFFSET, &mut buf));
+    info!("Contents after erase starts with {=[u8]}", buf[0..4]);
+    if buf.iter().any(|x| *x != 0xFF) {
+        defmt::panic!("unexpected");
+    }
+
+    for b in buf.iter_mut() {
+        *b = 0xDA;
+    }
+
+    defmt::unwrap!(flash.write(ADDR_OFFSET, &mut buf));
+
+    defmt::unwrap!(flash.read(ADDR_OFFSET, &mut buf));
+    info!("Contents after write starts with {=[u8]}", buf[0..4]);
+    if buf.iter().any(|x| *x != 0xDA) {
+        defmt::panic!("unexpected");
+    }
+
+    info!("Test OK");
+    cortex_m::asm::bkpt();
+}