MCUboot timeout during DFU

RE: MCUboot timeout during DFU

DX_HK — Mon, 17 Mar 2025 05:32:58 GMT

Hello, I also need a timeout escape from DFU.
The nRF52 is a device that is not normally connected via USB, and is only connected via USB when updating the firmware.
If DFU is not started due to several reasons, there is a need to automatically return to the application.

It has been four years since this Q&A was posted, but is the timeout escape function implemented in the current NCS?

RE: MCUboot timeout during DFU

Tjaz — Wed, 10 Mar 2021 09:03:43 GMT

Hi,

thanks for the provided information.

For anyone else wondering, we ended up writing our own patch that looks like this:

diff --git a/boot/boot_serial/src/boot_serial.c b/boot/boot_serial/src/boot_serial.c
index 9f9cd15..c7a45b9 100644
--- a/boot/boot_serial/src/boot_serial.c
+++ b/boot/boot_serial/src/boot_serial.c
@@ -591,7 +591,15 @@ boot_serial_start(const struct boot_uart_funcs *f)
     max_input = sizeof(in_buf);
 
     off = 0;
+    uint64_t start = k_uptime_get();
+    const uint64_t TIMEOUT = (60 * 60 * 1000); // 60 min
     while (1) {
+        // timeout
+        if(k_uptime_get() - start > TIMEOUT)
+        {
+            break;
+        }
+
         rc = f->read(in_buf + off, sizeof(in_buf) - off, &full_line);
         if (rc <= 0 && !full_line) {
             continue;

This adds a 1 hour timeout to the DFU procedure.

Regards,
Tjaž

RE: MCUboot timeout during DFU

Heidi — Mon, 25 Jan 2021 12:50:09 GMT

Hi!

We don't have a timeout implemented in MCUboot.

But if you want to implement it yourself, it looks like mynewt has something in their MCUboot, so you could use this for inspiration when modifying the source code.

See ncs/bootloader/mcuboot/boot/mynewt/src/main.c more specifically lines 113-116 and lines 145-149.

/* Calculate the timeout duration in OS cputime ticks. */
static const uint32_t timeout_dur =
    MYNEWT_VAL(BOOT_SERIAL_DETECT_TIMEOUT) /
    (1000.0 / MYNEWT_VAL(OS_CPUTIME_FREQ));

/* Abort the listen on timeout. */
if (os_cputime_get32() >= start_tick + timeout_dur) {
    boot_uart_close();
    return false;
}

Best regards,

Heidi

RE: MCUboot timeout during DFU

Tjaz — Mon, 18 Jan 2021 12:45:58 GMT

Thanks.
Looking forward to any information.

RE: MCUboot timeout during DFU

Heidi — Wed, 13 Jan 2021 12:55:33 GMT

Hi!

I don't have an answer for you at the moment. I just wanted to let you know I'm working on your case and I'll get back to you after talking to some of the developers.

Best regards,

Heidi