Remove generic const expressions from embassy-boot

* Remove the need for generic const expressions and use buffers provided in the flash config.
* Extend embedded-storage traits to simplify generics.
* Document all public APIs
* Add toplevel README
* Expose AlignedBuffer type for convenience.
* Update examples

12 files changed, 46 insertions, 34 deletions

diff --git a/examples/boot/application/nrf/src/bin/a.rs b/examples/boot/application/nrf/src/bin/a.rs
index bd8fa3246..133a3e678 100644
--- a/examples/boot/application/nrf/src/bin/a.rs
+++ b/examples/boot/application/nrf/src/bin/a.rs
@@ -36,7 +36,8 @@ async fn main(_spawner: Spawner) {
                 updater.write_firmware(offset, &buf, &mut nvmc, 4096).await.unwrap();
                 offset += chunk.len();
             }
-            updater.update(&mut nvmc).await.unwrap();
+            let mut magic = [0; 4];
+            updater.mark_updated(&mut nvmc, &mut magic).await.unwrap();
             led.set_high();
             cortex_m::peripheral::SCB::sys_reset();
         }
diff --git a/examples/boot/application/stm32f3/src/bin/a.rs b/examples/boot/application/stm32f3/src/bin/a.rs
index 11eecc5e2..fdbd5ab99 100644
--- a/examples/boot/application/stm32f3/src/bin/a.rs
+++ b/examples/boot/application/stm32f3/src/bin/a.rs
@@ -4,11 +4,11 @@
 
 #[cfg(feature = "defmt-rtt")]
 use defmt_rtt::*;
-use embassy_boot_stm32::FirmwareUpdater;
+use embassy_boot_stm32::{AlignedBuffer, FirmwareUpdater};
 use embassy_embedded_hal::adapter::BlockingAsync;
 use embassy_executor::Spawner;
 use embassy_stm32::exti::ExtiInput;
-use embassy_stm32::flash::Flash;
+use embassy_stm32::flash::{Flash, WRITE_SIZE};
 use embassy_stm32::gpio::{Input, Level, Output, Pull, Speed};
 use panic_reset as _;
 
@@ -35,7 +35,8 @@ async fn main(_spawner: Spawner) {
         updater.write_firmware(offset, &buf, &mut flash, 2048).await.unwrap();
         offset += chunk.len();
     }
-    updater.update(&mut flash).await.unwrap();
+    let mut magic = AlignedBuffer([0; WRITE_SIZE]);
+    updater.mark_updated(&mut flash, magic.as_mut()).await.unwrap();
     led.set_low();
     cortex_m::peripheral::SCB::sys_reset();
 }
diff --git a/examples/boot/application/stm32f7/src/bin/a.rs b/examples/boot/application/stm32f7/src/bin/a.rs
index a3b66e7c9..c08880fb3 100644
--- a/examples/boot/application/stm32f7/src/bin/a.rs
+++ b/examples/boot/application/stm32f7/src/bin/a.rs
@@ -4,11 +4,11 @@
 
 #[cfg(feature = "defmt-rtt")]
 use defmt_rtt::*;
-use embassy_boot_stm32::FirmwareUpdater;
+use embassy_boot_stm32::{AlignedBuffer, FirmwareUpdater};
 use embassy_embedded_hal::adapter::BlockingAsync;
 use embassy_executor::Spawner;
 use embassy_stm32::exti::ExtiInput;
-use embassy_stm32::flash::Flash;
+use embassy_stm32::flash::{Flash, WRITE_SIZE};
 use embassy_stm32::gpio::{Input, Level, Output, Pull, Speed};
 use panic_reset as _;
 
@@ -35,7 +35,8 @@ async fn main(_spawner: Spawner) {
         updater.write_firmware(offset, &buf, &mut flash, 2048).await.unwrap();
         offset += chunk.len();
     }
-    updater.update(&mut flash).await.unwrap();
+    let mut magic = AlignedBuffer([0; WRITE_SIZE]);
+    updater.mark_updated(&mut flash, magic.as_mut()).await.unwrap();
     led.set_low();
     cortex_m::peripheral::SCB::sys_reset();
 }
diff --git a/examples/boot/application/stm32h7/Cargo.toml b/examples/boot/application/stm32h7/Cargo.toml
index 5669527fe..7a76a8db5 100644
--- a/examples/boot/application/stm32h7/Cargo.toml
+++ b/examples/boot/application/stm32h7/Cargo.toml
@@ -4,7 +4,7 @@ name = "embassy-boot-stm32h7-examples"
 version = "0.1.0"
 
 [dependencies]
-embassy-sync = { version = "0.1.0", path = "../../../../embassy-sync", features = ["defmt"] }
+embassy-sync = { version = "0.1.0", path = "../../../../embassy-sync" }
 embassy-executor = { version = "0.1.0", path = "../../../../embassy-executor", features = ["nightly", "integrated-timers"] }
 embassy-time = { version = "0.1.0", path = "../../../../embassy-time", features = ["nightly", "tick-32768hz"] }
 embassy-stm32 = { version = "0.1.0", path = "../../../../embassy-stm32", features = ["unstable-traits", "nightly", "stm32h743zi", "time-driver-any", "exti"]  }
diff --git a/examples/boot/application/stm32h7/flash-boot.sh b/examples/boot/application/stm32h7/flash-boot.sh
index debdb17a7..a3003681a 100755
--- a/examples/boot/application/stm32h7/flash-boot.sh
+++ b/examples/boot/application/stm32h7/flash-boot.sh
@@ -1,8 +1,9 @@
 #!/bin/bash
+probe-rs-cli erase --chip STM32H743ZITx
 mv ../../bootloader/stm32/memory.x ../../bootloader/stm32/memory-old.x
 cp memory-bl.x ../../bootloader/stm32/memory.x
 
-cargo flash --manifest-path ../../bootloader/stm32/Cargo.toml --release --features embassy-stm32/stm32f767zi --chip STM32F767ZITx --target thumbv7em-none-eabihf
+cargo flash --manifest-path ../../bootloader/stm32/Cargo.toml --release --features embassy-stm32/stm32h743zi --chip STM32H743ZITx --target thumbv7em-none-eabihf
 
 rm ../../bootloader/stm32/memory.x
 mv ../../bootloader/stm32/memory-old.x ../../bootloader/stm32/memory.x
diff --git a/examples/boot/application/stm32h7/src/bin/a.rs b/examples/boot/application/stm32h7/src/bin/a.rs
index 0ecf60348..f5a8fdb61 100644
--- a/examples/boot/application/stm32h7/src/bin/a.rs
+++ b/examples/boot/application/stm32h7/src/bin/a.rs
@@ -4,11 +4,11 @@
 
 #[cfg(feature = "defmt-rtt")]
 use defmt_rtt::*;
-use embassy_boot_stm32::FirmwareUpdater;
+use embassy_boot_stm32::{AlignedBuffer, FirmwareUpdater};
 use embassy_embedded_hal::adapter::BlockingAsync;
 use embassy_executor::Spawner;
 use embassy_stm32::exti::ExtiInput;
-use embassy_stm32::flash::Flash;
+use embassy_stm32::flash::{Flash, WRITE_SIZE};
 use embassy_stm32::gpio::{Input, Level, Output, Pull, Speed};
 use panic_reset as _;
 
@@ -29,13 +29,17 @@ async fn main(_spawner: Spawner) {
     let mut updater = FirmwareUpdater::default();
     button.wait_for_rising_edge().await;
     let mut offset = 0;
-    let mut buf: [u8; 128 * 1024] = [0; 128 * 1024];
+    let mut buf = AlignedBuffer([0; 128 * 1024]);
     for chunk in APP_B.chunks(128 * 1024) {
-        buf[..chunk.len()].copy_from_slice(chunk);
-        updater.write_firmware(offset, &buf, &mut flash, 2048).await.unwrap();
+        buf.as_mut()[..chunk.len()].copy_from_slice(chunk);
+        updater
+            .write_firmware(offset, buf.as_ref(), &mut flash, 2048)
+            .await
+            .unwrap();
         offset += chunk.len();
     }
-    updater.update(&mut flash).await.unwrap();
+    let mut magic = AlignedBuffer([0; WRITE_SIZE]);
+    updater.mark_updated(&mut flash, magic.as_mut()).await.unwrap();
     led.set_low();
     cortex_m::peripheral::SCB::sys_reset();
 }
diff --git a/examples/boot/application/stm32l0/src/bin/a.rs b/examples/boot/application/stm32l0/src/bin/a.rs
index f4f1d7119..f0b0b80e3 100644
--- a/examples/boot/application/stm32l0/src/bin/a.rs
+++ b/examples/boot/application/stm32l0/src/bin/a.rs
@@ -4,11 +4,11 @@
 
 #[cfg(feature = "defmt-rtt")]
 use defmt_rtt::*;
-use embassy_boot_stm32::FirmwareUpdater;
+use embassy_boot_stm32::{AlignedBuffer, FirmwareUpdater};
 use embassy_embedded_hal::adapter::BlockingAsync;
 use embassy_executor::Spawner;
 use embassy_stm32::exti::ExtiInput;
-use embassy_stm32::flash::Flash;
+use embassy_stm32::flash::{Flash, WRITE_SIZE};
 use embassy_stm32::gpio::{Input, Level, Output, Pull, Speed};
 use embassy_time::{Duration, Timer};
 use panic_reset as _;
@@ -38,7 +38,8 @@ async fn main(_spawner: Spawner) {
         offset += chunk.len();
     }
 
-    updater.update(&mut flash).await.unwrap();
+    let mut magic = AlignedBuffer([0; WRITE_SIZE]);
+    updater.mark_updated(&mut flash, magic.as_mut()).await.unwrap();
     led.set_low();
     Timer::after(Duration::from_secs(1)).await;
     cortex_m::peripheral::SCB::sys_reset();
diff --git a/examples/boot/application/stm32l1/src/bin/a.rs b/examples/boot/application/stm32l1/src/bin/a.rs
index f4f1d7119..f0b0b80e3 100644
--- a/examples/boot/application/stm32l1/src/bin/a.rs
+++ b/examples/boot/application/stm32l1/src/bin/a.rs
@@ -4,11 +4,11 @@
 
 #[cfg(feature = "defmt-rtt")]
 use defmt_rtt::*;
-use embassy_boot_stm32::FirmwareUpdater;
+use embassy_boot_stm32::{AlignedBuffer, FirmwareUpdater};
 use embassy_embedded_hal::adapter::BlockingAsync;
 use embassy_executor::Spawner;
 use embassy_stm32::exti::ExtiInput;
-use embassy_stm32::flash::Flash;
+use embassy_stm32::flash::{Flash, WRITE_SIZE};
 use embassy_stm32::gpio::{Input, Level, Output, Pull, Speed};
 use embassy_time::{Duration, Timer};
 use panic_reset as _;
@@ -38,7 +38,8 @@ async fn main(_spawner: Spawner) {
         offset += chunk.len();
     }
 
-    updater.update(&mut flash).await.unwrap();
+    let mut magic = AlignedBuffer([0; WRITE_SIZE]);
+    updater.mark_updated(&mut flash, magic.as_mut()).await.unwrap();
     led.set_low();
     Timer::after(Duration::from_secs(1)).await;
     cortex_m::peripheral::SCB::sys_reset();
diff --git a/examples/boot/application/stm32l4/src/bin/a.rs b/examples/boot/application/stm32l4/src/bin/a.rs
index 178b2e04a..5119bad2e 100644
--- a/examples/boot/application/stm32l4/src/bin/a.rs
+++ b/examples/boot/application/stm32l4/src/bin/a.rs
@@ -4,11 +4,11 @@
 
 #[cfg(feature = "defmt-rtt")]
 use defmt_rtt::*;
-use embassy_boot_stm32::FirmwareUpdater;
+use embassy_boot_stm32::{AlignedBuffer, FirmwareUpdater};
 use embassy_embedded_hal::adapter::BlockingAsync;
 use embassy_executor::Spawner;
 use embassy_stm32::exti::ExtiInput;
-use embassy_stm32::flash::Flash;
+use embassy_stm32::flash::{Flash, WRITE_SIZE};
 use embassy_stm32::gpio::{Input, Level, Output, Pull, Speed};
 use panic_reset as _;
 
@@ -35,7 +35,8 @@ async fn main(_spawner: Spawner) {
         updater.write_firmware(offset, &buf, &mut flash, 2048).await.unwrap();
         offset += chunk.len();
     }
-    updater.update(&mut flash).await.unwrap();
+    let mut magic = AlignedBuffer([0; WRITE_SIZE]);
+    updater.mark_updated(&mut flash, magic.as_mut()).await.unwrap();
     led.set_low();
     cortex_m::peripheral::SCB::sys_reset();
 }
diff --git a/examples/boot/application/stm32wl/src/bin/a.rs b/examples/boot/application/stm32wl/src/bin/a.rs
index c71a42654..faa650778 100644
--- a/examples/boot/application/stm32wl/src/bin/a.rs
+++ b/examples/boot/application/stm32wl/src/bin/a.rs
@@ -4,11 +4,11 @@
 
 #[cfg(feature = "defmt-rtt")]
 use defmt_rtt::*;
-use embassy_boot_stm32::FirmwareUpdater;
+use embassy_boot_stm32::{AlignedBuffer, FirmwareUpdater};
 use embassy_embedded_hal::adapter::BlockingAsync;
 use embassy_executor::Spawner;
 use embassy_stm32::exti::ExtiInput;
-use embassy_stm32::flash::Flash;
+use embassy_stm32::flash::{Flash, WRITE_SIZE};
 use embassy_stm32::gpio::{Input, Level, Output, Pull, Speed};
 use panic_reset as _;
 
@@ -37,7 +37,8 @@ async fn main(_spawner: Spawner) {
         updater.write_firmware(offset, &buf, &mut flash, 2048).await.unwrap();
         offset += chunk.len();
     }
-    updater.update(&mut flash).await.unwrap();
+    let mut magic = AlignedBuffer([0; WRITE_SIZE]);
+    updater.mark_updated(&mut flash, magic.as_mut()).await.unwrap();
     //defmt::info!("Marked as updated");
     led.set_low();
     cortex_m::peripheral::SCB::sys_reset();
diff --git a/examples/boot/bootloader/nrf/src/main.rs b/examples/boot/bootloader/nrf/src/main.rs
index bc7e0755f..9031997c2 100644
--- a/examples/boot/bootloader/nrf/src/main.rs
+++ b/examples/boot/bootloader/nrf/src/main.rs
@@ -20,10 +20,8 @@ fn main() -> ! {
     */
 
     let mut bl = BootLoader::default();
-    let start = bl.prepare(&mut SingleFlashProvider::new(&mut WatchdogFlash::start(
-        Nvmc::new(p.NVMC),
-        p.WDT,
-        5,
+    let start = bl.prepare(&mut SingleFlashConfig::new(&mut BootFlash::<_, 4096>::new(
+        &mut WatchdogFlash::start(Nvmc::new(p.NVMC), p.WDT, 5),
     )));
     unsafe { bl.load(start) }
 }
diff --git a/examples/boot/bootloader/stm32/src/main.rs b/examples/boot/bootloader/stm32/src/main.rs
index 45c511ced..bb5d3e531 100644
--- a/examples/boot/bootloader/stm32/src/main.rs
+++ b/examples/boot/bootloader/stm32/src/main.rs
@@ -5,7 +5,7 @@ use cortex_m_rt::{entry, exception};
 #[cfg(feature = "defmt")]
 use defmt_rtt as _;
 use embassy_boot_stm32::*;
-use embassy_stm32::flash::{Flash, ERASE_SIZE};
+use embassy_stm32::flash::{Flash, ERASE_SIZE, ERASE_VALUE, WRITE_SIZE};
 
 #[entry]
 fn main() -> ! {
@@ -19,9 +19,11 @@ fn main() -> ! {
         }
     */
 
-    let mut bl: BootLoader<ERASE_SIZE> = BootLoader::default();
+    let mut bl: BootLoader<ERASE_SIZE, WRITE_SIZE> = BootLoader::default();
     let mut flash = Flash::unlock(p.FLASH);
-    let start = bl.prepare(&mut SingleFlashProvider::new(&mut flash));
+    let start = bl.prepare(&mut SingleFlashConfig::new(
+        &mut BootFlash::<_, ERASE_SIZE, ERASE_VALUE>::new(&mut flash),
+    ));
     core::mem::drop(flash);
     unsafe { bl.load(start) }
 }