X-Git-Url: http://git.code-monkey.de/?a=blobdiff_plain;f=src%2Fbootloader%2Fmain.rs;h=1a0a7cc3d53ebdf1194ec88bd11a3eec541837c7;hb=08e2e672414121f839ed0519c2e322d6a562e1c5;hp=0f863fc4af6338c033edb1df7f847c7465196ce1;hpb=dbda961b1cc62d8bbc155bd53d74a1fb52fed654;p=gps-watch.git

diff --git a/src/bootloader/main.rs b/src/bootloader/main.rs
index 0f863fc..1a0a7cc 100644
--- a/src/bootloader/main.rs
+++ b/src/bootloader/main.rs
@@ -30,29 +30,63 @@ extern crate common;
 mod flash;
 mod bootloader;
 
+use common::register;
 use common::clock;
 use common::systick;
+use common::port;
+use common::gpio;
 use common::usb_serial;
 
+type Reg32 = register::Register<u32>;
+
 extern {
     fn jump_to_application(address: u32);
 }
 
+#[cfg(bootloader_type = "intermediate")]
 const APPLICATION_ADDR: u32 = 0x0;
 
+#[cfg(bootloader_type = "final")]
+const APPLICATION_ADDR: u32 = 0x8000;
+
+unsafe fn application_missing() -> bool {
+    let first_app_word = Reg32::new(APPLICATION_ADDR);
+
+    first_app_word.read() == 0xffffffff
+}
+
+fn bootloader_requested() -> bool {
+    let start_ticks = systick::now();
+
+    while !systick::has_timeout_ms(start_ticks, 3000) {
+        if (gpio::get(gpio::GPIOE) & (1 << 24)) == 0 {
+            return true;
+        }
+    }
+
+    false
+}
+
 #[no_mangle]
 pub unsafe extern fn main() {
     clock::configure();
     systick::init();
 
-    if true {
+    // Configure lower left push button.
+    gpio::set_direction(gpio::GPIOE, 1 << 24, gpio::Direction::Input);
+    port::set_af(port::PORTE, 24, 1);
+    port::set_pull(port::PORTE, 24, port::Pull::Up);
+
+    if application_missing() || bootloader_requested() {
         usb_serial::init(0xf055, 0x635c);
 
         let mut b = bootloader::Bootloader::new();
 
-        while b.run() {
+        while b.run() || application_missing() {
         }
+
+        usb_serial::shutdown();
     }
 
-    jump_to_application(__application_addr);
+    jump_to_application(APPLICATION_ADDR);
 }