wait_for_queue() hangs on re-init of DFU service

[ypearson]

I have an app that requires BLE stack to be re-initialized, however it seems that if you run

ble_dfu_init();

more than once, it crashes

Upon further inspection is seems the source the of crash is here:

nrf_dfu_settings_init();

Drilling down, I discovered it seems to be hanging on:

wait_for_queue();

I'm using nRF5_SDK_12.2.0

I can prevent it hanging by increasing this constant:

FS_QUEUE_SIZE

However, it no longer advertises correctly because of:

// Delay starting advertising until the flash operations are complete.
if (flash_access_in_progress())
{
    m_advertising_start_pending = true;
    return NRF_SUCCESS;
}

[ypearson]

The problem is mainly due to the inability to re-init the flash whilst you have pending flash operations (from peer manager and DFU init). They need to be handled before attempting a re-init. Also if you are using freertos you need to modify:

app_timer_create()

Here is the fix that seems to be working for me:

static uint8_t is_flash_busy(void) {

uint32_t count;

fs_queued_op_count_get(&count);

return (count!=0);}

static void pre_ble_reinit(void) {

while(is_flash_busy())
 {
    while (pdFALSE == xSemaphoreTake(m_ble_event_ready, portMAX_DELAY));

    intern_softdevice_events_execute();
 }}