RE: SDK15 Secure bootloader timeout limit

Simon — Fri, 05 Oct 2018 07:43:51 GMT

The reason it fails is due to this assertion:

ASSERT(timeout_ticks <= MAX_TIMEOUT_TICKS);

It fires from main()-->nrf_bootloader_init(..)-->nrf_bootloader_dfu_inactivity_timer_restart(..)-->timer_start(..)-->timer_activate(..).

MAX_TIMEOUT_TICKS is defined as 16777215 ticks, which corresponds to ((16777215*1000)/32768) = 511 999 ms (8.53 minutes). The following is commented about this definition:

"The longest fire timeout allowed. Longer timeouts are handled by multiple firings."

Thus, this can be resolved by adding mechanisms to the callback function fed into nrf_bootloader_dfu_inactivity_timer_restart(..). For example, you can set the timeout to 5 minutes, and restart only when the timeout callback function has fired twice.

Best regards, Simon