SOFTDEVICE : INVALID MEMORY ACCESS ERROR while running integrated multilink ble uart central and nfc writable ndef msg project.

[Nagma]

Hi Nordic Team,

My dev environment is as follow:

nRF52832(Ble Central + nfc) + S132+ SES

I have integrated BLE Central Multilink uart project with nfc writable ndef msg project . I have included all the files necessary for nfc and had removed nrf_nvic and nrf_soc files from driver folder as per instruction from one of the post here . But i am still getting "SOFTDEVICE:INVALID MEMORY ACCESS ERROR" and the code gets stuck in line "APP_SCHED_INIT()".

Kindly help me resolve this issue . Thank you.

[Vidar Berg]

Hello,

The NRF_FAULT_ID_APP_MEMACC assert indicates that the app FW either tried to access a Softdevice reserved peripheral (Hardwar peripherals), or wrote something to the Softdevice reserved RAM region.

Please read the value of the 'info' argument passed to the app_error_fault_handler() when you get the error to see if it was a RAM or peripheral access violation.

You can make the fault handler print the info value like this:

__WEAK void app_error_fault_handler(uint32_t id, uint32_t pc, uint32_t info)
{
    __disable_irq();
    NRF_LOG_FINAL_FLUSH();

#ifndef DEBUG
    NRF_LOG_ERROR("Fatal error");
#else
    switch (id)
    {
#if defined(SOFTDEVICE_PRESENT) && SOFTDEVICE_PRESENT
        case NRF_FAULT_ID_SD_ASSERT:
            NRF_LOG_ERROR("SOFTDEVICE: ASSERTION FAILED");
            break;
        case NRF_FAULT_ID_APP_MEMACC:
            NRF_LOG_ERROR("SOFTDEVICE: INVALID MEMORY ACCESS. Info %d", info); // modified line
            break;
#endif

Best regards,

Vidar

[Nagma]

I did the above changes and found

It is 0x40000000

 error

[Vidar Berg]

Thanks. So the assert indicates that the app is trying to access the NVMC peripheral directly rather than going through the sd_flash_* APIs (Flash memory API).

Are you using FDS/Fstorage in your code? In that case, please make sure you have selected the SoftDevice backend. The backend can be selected in sdk_config.h

[Nagma]

As i am using nfc writable ndef msg project with my ble central code, I had enable both FDS/Fstorage in sdk_config.h file. 

NRF_FSTORAGE_ENABLED 1

FDS_BACKEND 1

Do i need to enable any other options? 

[Nagma]

I notice my mistake it should have been FDS_BACKEND 2 as i am using softdevice.