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-rw-r--r--embassy-boot/rp/src/lib.rs90
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1#![no_std]
2#![warn(missing_docs)]
3#![doc = include_str!("../README.md")]
4mod fmt;
5
6pub use embassy_boot::{
7 AlignedBuffer, BlockingFirmwareState, BlockingFirmwareUpdater, BootLoaderConfig, FirmwareState, FirmwareUpdater,
8 FirmwareUpdaterConfig, State,
9};
10use embassy_rp::flash::{Blocking, Flash, ERASE_SIZE};
11use embassy_rp::peripherals::{FLASH, WATCHDOG};
12use embassy_rp::watchdog::Watchdog;
13use embassy_time::Duration;
14use embedded_storage::nor_flash::{ErrorType, NorFlash, ReadNorFlash};
15
16/// A bootloader for RP2040 devices.
17pub struct BootLoader<const BUFFER_SIZE: usize = ERASE_SIZE>;
18
19impl<const BUFFER_SIZE: usize> BootLoader<BUFFER_SIZE> {
20 /// Inspect the bootloader state and perform actions required before booting, such as swapping firmware
21 pub fn prepare<ACTIVE: NorFlash, DFU: NorFlash, STATE: NorFlash>(
22 config: BootLoaderConfig<ACTIVE, DFU, STATE>,
23 ) -> Self {
24 let mut aligned_buf = AlignedBuffer([0; BUFFER_SIZE]);
25 let mut boot = embassy_boot::BootLoader::new(config);
26 boot.prepare_boot(aligned_buf.as_mut()).expect("Boot prepare error");
27 Self
28 }
29
30 /// Boots the application.
31 ///
32 /// # Safety
33 ///
34 /// This modifies the stack pointer and reset vector and will run code placed in the active partition.
35 pub unsafe fn load(self, start: u32) -> ! {
36 trace!("Loading app at 0x{:x}", start);
37 #[allow(unused_mut)]
38 let mut p = cortex_m::Peripherals::steal();
39 #[cfg(not(armv6m))]
40 p.SCB.invalidate_icache();
41 p.SCB.vtor.write(start);
42
43 cortex_m::asm::bootload(start as *const u32)
44 }
45}
46
47/// A flash implementation that will feed a watchdog when touching flash.
48pub struct WatchdogFlash<'d, const SIZE: usize> {
49 flash: Flash<'d, FLASH, Blocking, SIZE>,
50 watchdog: Watchdog,
51}
52
53impl<'d, const SIZE: usize> WatchdogFlash<'d, SIZE> {
54 /// Start a new watchdog with a given flash and watchdog peripheral and a timeout
55 pub fn start(flash: FLASH, watchdog: WATCHDOG, timeout: Duration) -> Self {
56 let flash = Flash::<_, Blocking, SIZE>::new_blocking(flash);
57 let mut watchdog = Watchdog::new(watchdog);
58 watchdog.start(timeout);
59 Self { flash, watchdog }
60 }
61}
62
63impl<'d, const SIZE: usize> ErrorType for WatchdogFlash<'d, SIZE> {
64 type Error = <Flash<'d, FLASH, Blocking, SIZE> as ErrorType>::Error;
65}
66
67impl<'d, const SIZE: usize> NorFlash for WatchdogFlash<'d, SIZE> {
68 const WRITE_SIZE: usize = <Flash<'d, FLASH, Blocking, SIZE> as NorFlash>::WRITE_SIZE;
69 const ERASE_SIZE: usize = <Flash<'d, FLASH, Blocking, SIZE> as NorFlash>::ERASE_SIZE;
70
71 fn erase(&mut self, from: u32, to: u32) -> Result<(), Self::Error> {
72 self.watchdog.feed();
73 self.flash.blocking_erase(from, to)
74 }
75 fn write(&mut self, offset: u32, data: &[u8]) -> Result<(), Self::Error> {
76 self.watchdog.feed();
77 self.flash.blocking_write(offset, data)
78 }
79}
80
81impl<'d, const SIZE: usize> ReadNorFlash for WatchdogFlash<'d, SIZE> {
82 const READ_SIZE: usize = <Flash<'d, FLASH, Blocking, SIZE> as ReadNorFlash>::READ_SIZE;
83 fn read(&mut self, offset: u32, data: &mut [u8]) -> Result<(), Self::Error> {
84 self.watchdog.feed();
85 self.flash.blocking_read(offset, data)
86 }
87 fn capacity(&self) -> usize {
88 self.flash.capacity()
89 }
90}