Import otp from rp-hal, helper fns for chipid and randid

Again, credit to @thejpster for doing the hard part and figuring out the
otp.

1 files changed, 46 insertions, 0 deletions

diff --git a/examples/rp23/src/bin/otp.rs b/examples/rp23/src/bin/otp.rs
new file mode 100644
index 000000000..c4d79c6ea
--- /dev/null
+++ b/examples/rp23/src/bin/otp.rs
@@ -0,0 +1,46 @@
+//! This example shows reading the OTP constants on the RP235x.
+
+#![no_std]
+#![no_main]
+
+use defmt::*;
+use embassy_executor::Spawner;
+use embassy_rp::block::ImageDef;
+use embassy_rp::otp;
+use embassy_time::Timer;
+use {defmt_rtt as _, panic_probe as _};
+
+#[link_section = ".start_block"]
+#[used]
+pub static IMAGE_DEF: ImageDef = ImageDef::secure_exe();
+
+// Program metadata for `picotool info`
+#[link_section = ".bi_entries"]
+#[used]
+pub static PICOTOOL_ENTRIES: [embassy_rp::binary_info::EntryAddr; 4] = [
+    embassy_rp::binary_info::rp_program_name!(c"OTP Read Example"),
+    embassy_rp::binary_info::rp_cargo_version!(),
+    embassy_rp::binary_info::rp_program_description!(c"OTP Read Example"),
+    embassy_rp::binary_info::rp_program_build_attribute!(),
+];
+
+#[embassy_executor::main]
+async fn main(_spawner: Spawner) {
+    let _ = embassy_rp::init(Default::default());
+    //
+    // add some delay to give an attached debug probe time to parse the
+    // defmt RTT header. Reading that header might touch flash memory, which
+    // interferes with flash write operations.
+    // https://github.com/knurling-rs/defmt/pull/683
+    Timer::after_millis(10).await;
+
+    let unique_id = unwrap!(otp::get_unique_id());
+    info!("Unique id:{:X}", unique_id);
+
+    let private_rand = unwrap!(otp::get_private_random_number());
+    info!("Private Rand:{:X}", private_rand);
+
+    loop {
+        Timer::after_secs(1).await;
+    }
+}