RE: BLE_NUS Service + FATFS storage on external flash

bojan — Tue, 22 Sep 2020 09:31:40 GMT

Makes sense, Vidar Berg! Will give it a try.

Thanks for the great suggestions!

Cheers!

RE: BLE_NUS Service + FATFS storage on external flash

Vidar Berg — Tue, 22 Sep 2020 09:09:37 GMT

Hello Bojan,

I guess this relates to interrupt priorities. The nus_data_handler() is inside the Softdevice 'SD_EVT_IRQn' interrupt context with priority 6 which is the same as the default priority used by all of our peripheral drivers. In other words, I think it's likely that your QSPI driver interrupts are getting blocked by the SD interrupt handler in this case.

You could try to increase the interrupt priority of the QSPI driver and see if it helps. However, it's generally considered good practice to avoid blocking calls inside interrupt handlers so I would instead suggest to deffer processing of these calls to the main context. One way you can do that is by setting a volatile flag inside the nus handler and do the processing from your main loop.

Something like this:

static volatile bool m_received_first_packet;
void nus_data_hanlder(..)
{
    ...
    if (<first data packet received>)
    {
        m_received_first_packet = true;
    }
    ..
    
}

int main(void)
{
    ...
    for(;;)
    {
        if (m_received_first_packet)
        {
            m_received_first_packet = false;
            open_apend();

Best regards,

Vidar