107 lines
3.7 KiB
Rust
107 lines
3.7 KiB
Rust
#![no_std]
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#![no_main]
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use core::cell::RefCell;
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use cortex_m_rt::{entry, exception};
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#[cfg(feature = "defmt")]
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use defmt_rtt as _;
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use embassy_boot_stm32::*;
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use embassy_stm32::flash::{Flash, BANK1_REGION, WRITE_SIZE};
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use embassy_stm32::rcc::WPAN_DEFAULT;
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use embassy_stm32::usb::Driver;
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use embassy_stm32::{bind_interrupts, peripherals, usb};
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use embassy_sync::blocking_mutex::Mutex;
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use embassy_usb::{msos, Builder};
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use embassy_usb_dfu::consts::DfuAttributes;
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use embassy_usb_dfu::{usb_dfu, Control, ResetImmediate};
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bind_interrupts!(struct Irqs {
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USB_LP => usb::InterruptHandler<peripherals::USB>;
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});
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// This is a randomly generated GUID to allow clients on Windows to find our device
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const DEVICE_INTERFACE_GUIDS: &[&str] = &["{EAA9A5DC-30BA-44BC-9232-606CDC875321}"];
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#[entry]
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fn main() -> ! {
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let mut config = embassy_stm32::Config::default();
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config.rcc = WPAN_DEFAULT;
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let p = embassy_stm32::init(config);
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// Prevent a hard fault when accessing flash 'too early' after boot.
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#[cfg(feature = "defmt")]
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for _ in 0..10000000 {
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cortex_m::asm::nop();
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}
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let layout = Flash::new_blocking(p.FLASH).into_blocking_regions();
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let flash = Mutex::new(RefCell::new(layout.bank1_region));
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let config = BootLoaderConfig::from_linkerfile_blocking(&flash, &flash, &flash);
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let active_offset = config.active.offset();
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let bl = BootLoader::prepare::<_, _, _, 2048>(config);
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if bl.state == State::DfuDetach {
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let driver = Driver::new(p.USB, Irqs, p.PA12, p.PA11);
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let mut config = embassy_usb::Config::new(0xc0de, 0xcafe);
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config.manufacturer = Some("Embassy");
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config.product = Some("USB-DFU Bootloader example");
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config.serial_number = Some("1235678");
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let fw_config = FirmwareUpdaterConfig::from_linkerfile_blocking(&flash, &flash);
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let mut buffer = AlignedBuffer([0; WRITE_SIZE]);
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let updater = BlockingFirmwareUpdater::new(fw_config, &mut buffer.0[..]);
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let mut config_descriptor = [0; 256];
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let mut bos_descriptor = [0; 256];
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let mut control_buf = [0; 4096];
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let mut state = Control::new(updater, DfuAttributes::CAN_DOWNLOAD);
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let mut builder = Builder::new(
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driver,
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config,
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&mut config_descriptor,
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&mut bos_descriptor,
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&mut [],
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&mut control_buf,
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);
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// We add MSOS headers so that the device automatically gets assigned the WinUSB driver on Windows.
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// Otherwise users need to do this manually using a tool like Zadig.
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//
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// It seems it is important for the DFU class that these headers be on the Device level.
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//
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builder.msos_descriptor(msos::windows_version::WIN8_1, 2);
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builder.msos_feature(msos::CompatibleIdFeatureDescriptor::new("WINUSB", ""));
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builder.msos_feature(msos::RegistryPropertyFeatureDescriptor::new(
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"DeviceInterfaceGUIDs",
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msos::PropertyData::RegMultiSz(DEVICE_INTERFACE_GUIDS),
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));
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usb_dfu::<_, _, _, ResetImmediate, 4096>(&mut builder, &mut state);
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let mut dev = builder.build();
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embassy_futures::block_on(dev.run());
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}
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unsafe { bl.load(BANK1_REGION.base + active_offset) }
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}
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#[no_mangle]
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#[cfg_attr(target_os = "none", link_section = ".HardFault.user")]
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unsafe extern "C" fn HardFault() {
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cortex_m::peripheral::SCB::sys_reset();
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}
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#[exception]
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unsafe fn DefaultHandler(_: i16) -> ! {
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const SCB_ICSR: *const u32 = 0xE000_ED04 as *const u32;
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let irqn = core::ptr::read_volatile(SCB_ICSR) as u8 as i16 - 16;
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panic!("DefaultHandler #{:?}", irqn);
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}
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#[panic_handler]
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fn panic(_info: &core::panic::PanicInfo) -> ! {
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cortex_m::asm::udf();
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}
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