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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,74 @@ | ||
| /// Indicate a reboot to DFU is requested. | ||
| pub fn start_dfu_reboot() { | ||
| extern "C" { | ||
| static mut _bootflag: u8; | ||
| } | ||
|
|
||
| unsafe { | ||
| let start_ptr = &mut _bootflag as *mut u8; | ||
| core::ptr::write_unaligned(start_ptr.cast::<u32>(), 0xDEAD_BEEF); | ||
| } | ||
|
|
||
| cortex_m::peripheral::SCB::sys_reset(); | ||
| } | ||
|
|
||
| /// Check if the DFU reboot flag is set, indicating a reboot to DFU is requested. | ||
| pub fn dfu_bootflag() -> bool { | ||
| // Obtain panic region start and end from linker symbol _panic_dump_start and _panic_dump_end | ||
| extern "C" { | ||
| static mut _bootflag: u8; | ||
| } | ||
|
|
||
| unsafe { | ||
| let start_ptr = &mut _bootflag as *mut u8; | ||
| let set = | ||
| 0xDEAD_BEEF == core::ptr::read_unaligned(start_ptr.cast::<u32>()); | ||
|
|
||
| // Clear the boot flag after checking it to ensure it doesn't stick between reboots. | ||
| core::ptr::write_unaligned(start_ptr.cast::<u32>(), 0); | ||
| set | ||
| } | ||
| } | ||
|
|
||
| /// Execute the DFU bootloader stored in system memory. | ||
| /// | ||
| /// # Note | ||
| /// This function must be called before any system configuration is performed, as the DFU | ||
| /// bootloader expects the system in an uninitialized state. | ||
| pub fn execute_system_bootloader() { | ||
| // This process is largely adapted from | ||
| // https://community.st.com/t5/stm32-mcus/jump-to-bootloader-from-application-on-stm32h7-devices/ta-p/49510 | ||
| cortex_m::interrupt::disable(); | ||
|
|
||
| // Disable the SysTick peripheral. | ||
| let systick = unsafe { &*cortex_m::peripheral::SYST::PTR }; | ||
| unsafe { | ||
| systick.csr.write(0); | ||
| systick.rvr.write(0); | ||
| systick.cvr.write(0); | ||
| } | ||
|
|
||
| // Clear NVIC interrupt flags and enables. | ||
| let nvic = unsafe { &*cortex_m::peripheral::NVIC::PTR }; | ||
| for reg in nvic.icer.iter() { | ||
| unsafe { | ||
| reg.write(u32::MAX); | ||
| } | ||
| } | ||
|
|
||
| for reg in nvic.icpr.iter() { | ||
| unsafe { | ||
| reg.write(u32::MAX); | ||
| } | ||
| } | ||
|
|
||
| unsafe { cortex_m::interrupt::enable() }; | ||
|
|
||
| // The chip does not provide a means to modify the BOOT pins during | ||
| // run-time. Jump to the bootloader in system memory instead. | ||
| unsafe { | ||
| let system_memory_address: *const u32 = 0x1FF0_9800 as *const u32; | ||
| log::info!("Jumping to DFU"); | ||
| cortex_m::asm::bootload(system_memory_address); | ||
| } | ||
| } |
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