Move bootloader main to examples

This should remove some confusion around embassy-boot-* being a library
vs. a binary. The binary is now an example bootloader instead.

8 files changed, 194 insertions, 0 deletions

diff --git a/examples/boot/application/nrf/.cargo/config.toml b/examples/boot/application/nrf/.cargo/config.toml
new file mode 100644
index 000000000..8ca28df39
--- /dev/null
+++ b/examples/boot/application/nrf/.cargo/config.toml
@@ -0,0 +1,9 @@
+[target.'cfg(all(target_arch = "arm", target_os = "none"))']
+# replace nRF82840_xxAA with your chip as listed in `probe-run --list-chips`
+runner = "probe-run --chip nRF52840_xxAA"
+
+[build]
+target = "thumbv7em-none-eabi"
+
+[env]
+DEFMT_LOG = "trace"
diff --git a/examples/boot/application/nrf/Cargo.toml b/examples/boot/application/nrf/Cargo.toml
new file mode 100644
index 000000000..0ae7163c3
--- /dev/null
+++ b/examples/boot/application/nrf/Cargo.toml
@@ -0,0 +1,18 @@
+[package]
+edition = "2021"
+name = "embassy-boot-nrf-examples"
+version = "0.1.0"
+
+[dependencies]
+embassy = { version = "0.1.0", path = "../../../../embassy", features = ["nightly"] }
+embassy-nrf = { version = "0.1.0", path = "../../../../embassy-nrf", features = ["time-driver-rtc1", "gpiote", "nightly", "nrf52840"] }
+embassy-boot-nrf = { version = "0.1.0", path = "../../../../embassy-boot/nrf" }
+embassy-embedded-hal = { version = "0.1.0", path = "../../../../embassy-embedded-hal" }
+
+defmt = { version = "0.3", optional = true }
+defmt-rtt = { version = "0.3", optional = true }
+panic-reset = { version = "0.1.1" }
+embedded-hal = { version = "0.2.6" }
+
+cortex-m = "0.7.3"
+cortex-m-rt = "0.7.0"
diff --git a/examples/boot/application/nrf/README.md b/examples/boot/application/nrf/README.md
new file mode 100644
index 000000000..703377a20
--- /dev/null
+++ b/examples/boot/application/nrf/README.md
@@ -0,0 +1,34 @@
+# Examples using bootloader
+
+Example for nRF52 demonstrating the bootloader. The example consists of application binaries, 'a'
+which allows you to press a button to start the DFU process, and 'b' which is the updated
+application.
+
+
+## Prerequisites
+
+* `cargo-binutils`
+* `cargo-flash`
+* `embassy-boot-nrf`
+
+## Usage
+
+
+
+```
+# Use bare metal linker script
+cp memory-bl.x ../../bootloader/nrf/memory.x
+
+# Flash bootloader
+cargo flash --manifest-path ../../bootloader/nrf/Cargo.toml --features embassy-nrf/nrf52840 --release --chip nRF52840_xxAA
+# Build 'b'
+cargo build --release --bin b
+# Generate binary for 'b'
+cargo objcopy --release --bin b -- -O binary b.bin
+```
+
+# Flash `a` (which includes b.bin)
+
+```
+cargo flash --release --bin a --chip nRF52840_xxAA
+```
diff --git a/examples/boot/application/nrf/build.rs b/examples/boot/application/nrf/build.rs
new file mode 100644
index 000000000..cd1a264c4
--- /dev/null
+++ b/examples/boot/application/nrf/build.rs
@@ -0,0 +1,34 @@
+//! This build script copies the `memory.x` file from the crate root into
+//! a directory where the linker can always find it at build time.
+//! For many projects this is optional, as the linker always searches the
+//! project root directory -- wherever `Cargo.toml` is. However, if you
+//! are using a workspace or have a more complicated build setup, this
+//! build script becomes required. Additionally, by requesting that
+//! Cargo re-run the build script whenever `memory.x` is changed,
+//! updating `memory.x` ensures a rebuild of the application with the
+//! new memory settings.
+
+use std::env;
+use std::fs::File;
+use std::io::Write;
+use std::path::PathBuf;
+
+fn main() {
+    // Put `memory.x` in our output directory and ensure it's
+    // on the linker search path.
+    let out = &PathBuf::from(env::var_os("OUT_DIR").unwrap());
+    File::create(out.join("memory.x"))
+        .unwrap()
+        .write_all(include_bytes!("memory.x"))
+        .unwrap();
+    println!("cargo:rustc-link-search={}", out.display());
+
+    // By default, Cargo will re-run a build script whenever
+    // any file in the project changes. By specifying `memory.x`
+    // here, we ensure the build script is only re-run when
+    // `memory.x` is changed.
+    println!("cargo:rerun-if-changed=memory.x");
+
+    println!("cargo:rustc-link-arg-bins=--nmagic");
+    println!("cargo:rustc-link-arg-bins=-Tlink.x");
+}
diff --git a/examples/boot/application/nrf/memory-bl.x b/examples/boot/application/nrf/memory-bl.x
new file mode 100644
index 000000000..8a32b905f
--- /dev/null
+++ b/examples/boot/application/nrf/memory-bl.x
@@ -0,0 +1,18 @@
+MEMORY
+{
+  /* NOTE 1 K = 1 KiBi = 1024 bytes */
+  FLASH                             : ORIGIN = 0x00000000, LENGTH = 24K
+  BOOTLOADER_STATE                  : ORIGIN = 0x00006000, LENGTH = 4K
+  ACTIVE                            : ORIGIN = 0x00007000, LENGTH = 64K
+  DFU                               : ORIGIN = 0x00017000, LENGTH = 68K
+  RAM                         (rwx) : ORIGIN = 0x20000008, LENGTH = 32K
+}
+
+__bootloader_state_start = ORIGIN(BOOTLOADER_STATE);
+__bootloader_state_end = ORIGIN(BOOTLOADER_STATE) + LENGTH(BOOTLOADER_STATE);
+
+__bootloader_active_start = ORIGIN(ACTIVE);
+__bootloader_active_end = ORIGIN(ACTIVE) + LENGTH(ACTIVE);
+
+__bootloader_dfu_start = ORIGIN(DFU);
+__bootloader_dfu_end = ORIGIN(DFU) + LENGTH(DFU);
diff --git a/examples/boot/application/nrf/memory.x b/examples/boot/application/nrf/memory.x
new file mode 100644
index 000000000..3a54ca460
--- /dev/null
+++ b/examples/boot/application/nrf/memory.x
@@ -0,0 +1,15 @@
+MEMORY
+{
+  /* NOTE 1 K = 1 KiBi = 1024 bytes */
+  BOOTLOADER                        : ORIGIN = 0x00000000, LENGTH = 24K
+  BOOTLOADER_STATE                  : ORIGIN = 0x00006000, LENGTH = 4K
+  FLASH                             : ORIGIN = 0x00007000, LENGTH = 64K
+  DFU                               : ORIGIN = 0x00017000, LENGTH = 68K
+  RAM                         (rwx) : ORIGIN = 0x20000008, LENGTH = 32K
+}
+
+__bootloader_state_start = ORIGIN(BOOTLOADER_STATE);
+__bootloader_state_end = ORIGIN(BOOTLOADER_STATE) + LENGTH(BOOTLOADER_STATE);
+
+__bootloader_dfu_start = ORIGIN(DFU);
+__bootloader_dfu_end = ORIGIN(DFU) + LENGTH(DFU);
diff --git a/examples/boot/application/nrf/src/bin/a.rs b/examples/boot/application/nrf/src/bin/a.rs
new file mode 100644
index 000000000..0b9715e49
--- /dev/null
+++ b/examples/boot/application/nrf/src/bin/a.rs
@@ -0,0 +1,43 @@
+#![no_std]
+#![no_main]
+#![macro_use]
+#![feature(generic_associated_types)]
+#![feature(type_alias_impl_trait)]
+
+use embassy_boot_nrf::FirmwareUpdater;
+use embassy_embedded_hal::adapter::BlockingAsync;
+use embassy_nrf::gpio::{Input, Level, Output, OutputDrive, Pull};
+use embassy_nrf::nvmc::Nvmc;
+use embassy_nrf::Peripherals;
+use panic_reset as _;
+
+static APP_B: &[u8] = include_bytes!("../../b.bin");
+
+#[embassy::main]
+async fn main(_s: embassy::executor::Spawner, p: Peripherals) {
+    let mut button = Input::new(p.P0_11, Pull::Up);
+    let mut led = Output::new(p.P0_13, Level::Low, OutputDrive::Standard);
+    //let mut led = Output::new(p.P1_10, Level::Low, OutputDrive::Standard);
+    //let mut button = Input::new(p.P1_02, Pull::Up);
+
+    let nvmc = Nvmc::new(p.NVMC);
+    let mut nvmc = BlockingAsync::new(nvmc);
+
+    let mut updater = FirmwareUpdater::default();
+    loop {
+        led.set_low();
+        button.wait_for_any_edge().await;
+        if button.is_low() {
+            let mut offset = 0;
+            for chunk in APP_B.chunks(4096) {
+                let mut buf: [u8; 4096] = [0; 4096];
+                buf[..chunk.len()].copy_from_slice(chunk);
+                updater.write_firmware(offset, &buf, &mut nvmc, 4096).await.unwrap();
+                offset += chunk.len();
+            }
+            updater.update(&mut nvmc).await.unwrap();
+            led.set_high();
+            cortex_m::peripheral::SCB::sys_reset();
+        }
+    }
+}
diff --git a/examples/boot/application/nrf/src/bin/b.rs b/examples/boot/application/nrf/src/bin/b.rs
new file mode 100644
index 000000000..a06c20f8b
--- /dev/null
+++ b/examples/boot/application/nrf/src/bin/b.rs
@@ -0,0 +1,23 @@
+#![no_std]
+#![no_main]
+#![macro_use]
+#![feature(generic_associated_types)]
+#![feature(type_alias_impl_trait)]
+
+use embassy::time::{Duration, Timer};
+use embassy_nrf::gpio::{Level, Output, OutputDrive};
+use embassy_nrf::Peripherals;
+use panic_reset as _;
+
+#[embassy::main]
+async fn main(_s: embassy::executor::Spawner, p: Peripherals) {
+    let mut led = Output::new(p.P0_13, Level::Low, OutputDrive::Standard);
+    //let mut led = Output::new(p.P1_10, Level::Low, OutputDrive::Standard);
+
+    loop {
+        led.set_high();
+        Timer::after(Duration::from_millis(300)).await;
+        led.set_low();
+        Timer::after(Duration::from_millis(300)).await;
+    }
+}