delay works

bootloader/README.md

@@ -22,7 +22,9 @@ The bootloader uses the following memory map:
 ## Additional Information
 
 This bootloader was specifically written for the REB1 board, so it assumes a M95M01 ST EEPROM
-is used to load the application code.
+is used to load the application code. The bootloader will also delay for a configurable amount
+of time before booting. This allows to catch the RTT printout, but should probably be disabled
+for production firmware.
 
 This bootloader does not provide tools to flash the NVM memory by itself. Instead, you can use
 the [flashloader](https://egit.irs.uni-stuttgart.de/rust/va108xx-rs/src/branch/main/flashloader)

bootloader/src/main.rs

@@ -4,18 +4,21 @@
 use bootloader::NvmInterface;
 use cortex_m_rt::entry;
 use crc::{Crc, CRC_16_IBM_3740};
+use embedded_hal::delay::DelayNs;
 #[cfg(not(feature = "rtt-panic"))]
 use panic_halt as _;
 #[cfg(feature = "rtt-panic")]
 use panic_rtt_target as _;
 use rtt_target::{rprintln, rtt_init_print};
-use va108xx_hal::{pac, time::Hertz};
+use va108xx_hal::{pac, time::Hertz, timer::CountdownTimer};
 use vorago_reb1::m95m01::M95M01;
 
 // Useful for debugging and see what the bootloader is doing. Enabled currently, because
 // the binary stays small enough.
 const RTT_PRINTOUT: bool = true;
 const DEBUG_PRINTOUTS: bool = true;
+// Small delay, allows RTT printout to catch up.
+const BOOT_DELAY_MS: u32 = 2000;
 
 // Dangerous option! An image with this option set to true will flash itself from RAM directly
 // into the NVM. This can be used as a recovery option from a direct RAM flash to fix the NVM
@@ -99,6 +102,7 @@ fn main() -> ! {
     }
     let mut dp = pac::Peripherals::take().unwrap();
     let cp = cortex_m::Peripherals::take().unwrap();
+    let mut timer = CountdownTimer::new(&mut dp.sysconfig, CLOCK_FREQ, dp.tim0);
 
     let mut nvm = M95M01::new(&mut dp.sysconfig, CLOCK_FREQ, dp.spic);
 
@@ -148,23 +152,28 @@ fn main() -> ! {
     let mut nvm = NvmWrapper(nvm);
 
     // Check bootloader's CRC (and write it if blank)
-    check_own_crc(&dp.sysconfig, &cp, &mut nvm);
+    check_own_crc(&dp.sysconfig, &cp, &mut nvm, &mut timer);
 
     if check_app_crc(AppSel::A) {
-        boot_app(&dp.sysconfig, &cp, AppSel::A)
+        boot_app(&dp.sysconfig, &cp, AppSel::A, &mut timer)
     } else if check_app_crc(AppSel::B) {
-        boot_app(&dp.sysconfig, &cp, AppSel::B)
+        boot_app(&dp.sysconfig, &cp, AppSel::B, &mut timer)
     } else {
         if DEBUG_PRINTOUTS && RTT_PRINTOUT {
             rprintln!("both images corrupt! booting image A");
         }
         // TODO: Shift a CCSDS packet out to inform host/OBC about image corruption.
         // Both images seem to be corrupt. Boot default image A.
-        boot_app(&dp.sysconfig, &cp, AppSel::A)
+        boot_app(&dp.sysconfig, &cp, AppSel::A, &mut timer)
     }
 }
 
-fn check_own_crc(sysconfig: &pac::Sysconfig, cp: &cortex_m::Peripherals, nvm: &mut NvmWrapper) {
+fn check_own_crc(
+    sysconfig: &pac::Sysconfig,
+    cp: &cortex_m::Peripherals,
+    nvm: &mut NvmWrapper,
+    timer: &mut CountdownTimer<pac::Tim0>,
+) {
     let crc_exp = unsafe { (BOOTLOADER_CRC_ADDR as *const u16).read_unaligned().to_be() };
     // I'd prefer to use [core::slice::from_raw_parts], but that is problematic
     // because the address of the bootloader is 0x0, so the NULL check fails and the functions
@@ -200,7 +209,7 @@ fn check_own_crc(sysconfig: &pac::Sysconfig, cp: &cortex_m::Peripherals, nvm: &m
             );
         }
         // TODO: Shift out minimal CCSDS frame to notify about bootloader corruption.
-        boot_app(sysconfig, cp, AppSel::A);
+        boot_app(sysconfig, cp, AppSel::A, timer);
     }
 }
 
@@ -249,10 +258,17 @@ fn check_app_given_addr(crc_addr: u32, start_addr: u32, image_size_addr: u32) ->
 
 // The boot works by copying the interrupt vector table (IVT) of the respective app to the
 // base address in code RAM (0x0) and then performing a soft reset.
-fn boot_app(syscfg: &pac::Sysconfig, cp: &cortex_m::Peripherals, app_sel: AppSel) -> ! {
+fn boot_app(
+    syscfg: &pac::Sysconfig,
+    cp: &cortex_m::Peripherals,
+    app_sel: AppSel,
+    timer: &mut CountdownTimer<pac::Tim0>,
+) -> ! {
     if DEBUG_PRINTOUTS && RTT_PRINTOUT {
         rprintln!("booting app {:?}", app_sel);
     }
+    timer.delay_ms(BOOT_DELAY_MS);
+
     // Clear all interrupts set.
     unsafe {
         cp.NVIC.icer[0].write(0xFFFFFFFF);
@@ -302,7 +318,6 @@ fn soft_reset(cp: &cortex_m::Peripherals) -> ! {
     }
     // Ensure completion of memory access.
     cortex_m::asm::dsb();
-    rprintln!("soft  reset done");
 
     // Loop until the reset occurs.
     loop {