1 files changed, 93 insertions, 0 deletions

diff --git a/examples/boot/bootloader/stm32wb-dfu/src/main.rs b/examples/boot/bootloader/stm32wb-dfu/src/main.rs
new file mode 100644
index 000000000..a7ab813b6
--- /dev/null
+++ b/examples/boot/bootloader/stm32wb-dfu/src/main.rs
@@ -0,0 +1,93 @@
+#![no_std]
+#![no_main]
+
+use core::cell::RefCell;
+
+use cortex_m_rt::{entry, exception};
+#[cfg(feature = "defmt")]
+use defmt_rtt as _;
+use embassy_boot_stm32::*;
+use embassy_stm32::flash::{Flash, BANK1_REGION, WRITE_SIZE};
+use embassy_stm32::rcc::WPAN_DEFAULT;
+use embassy_stm32::usb::Driver;
+use embassy_stm32::{bind_interrupts, peripherals, usb};
+use embassy_sync::blocking_mutex::Mutex;
+use embassy_usb::Builder;
+use embassy_usb_dfu::consts::DfuAttributes;
+use embassy_usb_dfu::{usb_dfu, Control, ResetImmediate};
+
+bind_interrupts!(struct Irqs {
+    USB_LP => usb::InterruptHandler<peripherals::USB>;
+});
+
+#[entry]
+fn main() -> ! {
+    let mut config = embassy_stm32::Config::default();
+    config.rcc = WPAN_DEFAULT;
+    let p = embassy_stm32::init(config);
+
+    // Prevent a hard fault when accessing flash 'too early' after boot.
+    #[cfg(feature = "defmt")]
+    for _ in 0..10000000 {
+        cortex_m::asm::nop();
+    }
+
+    let layout = Flash::new_blocking(p.FLASH).into_blocking_regions();
+    let flash = Mutex::new(RefCell::new(layout.bank1_region));
+
+    let config = BootLoaderConfig::from_linkerfile_blocking(&flash);
+    let active_offset = config.active.offset();
+    let bl = BootLoader::prepare::<_, _, _, 2048>(config);
+    if bl.state == State::DfuDetach {
+        let driver = Driver::new(p.USB, Irqs, p.PA12, p.PA11);
+        let mut config = embassy_usb::Config::new(0xc0de, 0xcafe);
+        config.manufacturer = Some("Embassy");
+        config.product = Some("USB-DFU Bootloader example");
+        config.serial_number = Some("1235678");
+
+        let fw_config = FirmwareUpdaterConfig::from_linkerfile_blocking(&flash);
+        let mut buffer = AlignedBuffer([0; WRITE_SIZE]);
+        let updater = BlockingFirmwareUpdater::new(fw_config, &mut buffer.0[..]);
+
+        let mut device_descriptor = [0; 256];
+        let mut config_descriptor = [0; 256];
+        let mut bos_descriptor = [0; 256];
+        let mut control_buf = [0; 4096];
+        let mut state = Control::new(updater, DfuAttributes::CAN_DOWNLOAD);
+        let mut builder = Builder::new(
+            driver,
+            config,
+            &mut device_descriptor,
+            &mut config_descriptor,
+            &mut bos_descriptor,
+            &mut [],
+            &mut control_buf,
+        );
+
+        usb_dfu::<_, _, _, ResetImmediate, 4096>(&mut builder, &mut state);
+
+        let mut dev = builder.build();
+        embassy_futures::block_on(dev.run());
+    }
+
+    unsafe { bl.load(BANK1_REGION.base + active_offset) }
+}
+
+#[no_mangle]
+#[cfg_attr(target_os = "none", link_section = ".HardFault.user")]
+unsafe extern "C" fn HardFault() {
+    cortex_m::peripheral::SCB::sys_reset();
+}
+
+#[exception]
+unsafe fn DefaultHandler(_: i16) -> ! {
+    const SCB_ICSR: *const u32 = 0xE000_ED04 as *const u32;
+    let irqn = core::ptr::read_volatile(SCB_ICSR) as u8 as i16 - 16;
+
+    panic!("DefaultHandler #{:?}", irqn);
+}
+
+#[panic_handler]
+fn panic(_info: &core::panic::PanicInfo) -> ! {
+    cortex_m::asm::udf();
+}