Why would app_timer_start fail for the bootloader?

[Anne van Rossum]

In the code for the bootloader in dfu_dual_bank.c and the function dfu_init, I currently get an error code on timer start: 4 (NRF_ERROR_NO_MEM).

err_code = app_timer_start(m_dfu_timer_id, DFU_TIMEOUT_INTERVAL, NULL);                                             
if (err_code != NRF_SUCCESS)                                                                                        
    nrf_gpio_pin_set(PIN_LED6); 

What might be the reason that app_timer_start would fail to work for the bootloader? From the code I can only see it being call in dfu_init and dfu_timer_restart. The latter function is not called, so can't be the culprit.

Do I need to do specific things to keep memory usage low for the bootloader?

[John]

The only reason I see for that failure would be that the timer operations queue was full. Have you tried bumping up APP_TIMER_OP_QUEUE_SIZE in your project?

[Anne van Rossum]

I will check when I'm back from holidays. However, due to the fact I just use the bootloader code I would be surprised because that would mean it wouldn't work for anyone.

[Anne van Rossum]

I increased it to 7, it still fails at app_timer_start. Note that I didn't change anything significant, so is it actually operational on the moment? :-)

[Stian Røed Hafskjold]

Hi, it shouldn't give that error unless APP_TIMER_OP_QUEUE_SIZE is to small as John says. Which SDK (bootloader) version and SoftDevice version are you using?

[Anne van Rossum]

S130. I have adjusted some things with the default bootloader such as using libc_s versions etc. That solved the memory issues. The default gcc compiled version doesn't work as such.