+#[cfg(bootloader_type = "final")]
+const APPLICATION_ADDR: u32 = 0x8000;
+
+#[cfg(bootloader_type = "intermediate")]
+const USB_PID: u16 = 0x635b;
+
+#[cfg(bootloader_type = "final")]
+const USB_PID: u16 = 0x635c;
+
+unsafe fn application_missing() -> bool {
+ let first_app_word = Reg32::new(APPLICATION_ADDR);
+
+ first_app_word.read() == 0xffffffff
+}
+
+#[cfg(bootloader_type = "intermediate")]
+fn bootloader_requested() -> bool {
+ true
+}
+
+#[cfg(bootloader_type = "final")]
+fn bootloader_requested() -> bool {
+ let start_ticks = systick::now();
+
+ while !systick::has_timeout_ms(start_ticks, 3000) {
+ if (gpio::get(gpio::GPIOE) & (1 << 31)) == 0 {
+ return true;
+ }
+ }
+
+ false
+}
+
+#[inline(never)]
+#[panic_handler]
+fn panic(_info: &core::panic::PanicInfo) -> ! {
+ loop {
+ }
+}
+