SPI when advertising not working

[danimalia]

Hi 

I am using SPI to talk to an LIS2DH with an NRF51822. I have merged the SPI Master example with the ble_app_rscs example and as soon as the ble advertising begins, my SPI interrupts no longer work and I end up in the hard fault. I have changed the IRQ priority to high but it still does not work. 

I am using SDK8.0.0 - I know it's old, it's the only SDK version I could get to work with the free version of Keil. 

[danimalia]

That’s what I thought, I changed it to only call spi_config once and then removed all the delays in get_acc_data and it still hangs

[Nguyen Hoan Hoang]

Where does it hang exactly ? Are there any errors returned by the SDK ?

[danimalia]

in the hardfault: 

the call stack is also not helping me determine how it got there...

[danimalia]

let me re-phrase that: 

the processor doesn't hang - I can still see me ble advertising packets and connect to it etc. as soon as I call spi_master_init or spi_send_recv after I have called advertising_init, nothing happens. I have scoped the SPI lines and nothing happens on them. 

If I put breakpoints on spi_master_init or spi_send_recv, I end up in the hardfault if I try step over those functions. 

seriously confused here

[Nguyen Hoan Hoang]

When softdevice is running,  you cannot debug.  You can breakpoint only.  Then it will crash if you try to step.  You need to restart every time you break.  With softdevice, you cannot hold the processor too long so the SPI init and data reading has to be done quickly.  Calling SD function within interrupt also not permitted.  Hence require to use App Scheduler.  When you hold the process too long, SD will crash.  This mean you SPI init and read data are taking too long to complete.