f_write/f_close cause BLE disconnect

[snowfield]

Hardware: nrf52832

SDK: 16.0.0 with FreeRtos, 

Softdevice: S132 7.0

I set configMAX_PRIORITIES to 5 and modified nrf_sdh_freertos_init to set BLE task priority to 4.

My sd card maintain task priority is set to 2.

For BLE NUS service:

#define MIN_CONN_INTERVAL MSEC_TO_UNITS(20, UNIT_1_25_MS) /**< Minimum acceptable connection interval (20 ms), Connection interval uses 1.25 ms units. */
#define MAX_CONN_INTERVAL MSEC_TO_UNITS(75, UNIT_1_25_MS) /**< Maximum acceptable connection interval (75 ms), Connection interval uses 1.25 ms units. */
#define SLAVE_LATENCY 0 /**< Slave latency. */
#define CONN_SUP_TIMEOUT MSEC_TO_UNITS(4000, UNIT_10_MS) /**< Connection supervisory time-out (4 seconds). */

The NUS service and SD card function works fine when test them separately. But if Operate SD card during NUS connection, I got disconnect with reason:0x8

I have tried to enlarge INTERVAL to 120ms/175ms, also tried to change SLAVE_LATENCY to 4. Problem still exist.

I searched internet and NRF Dev Zone, found some similar question, but none of them can resolve my problem. So I have to raise a new question here. 

 

[Simonr]

Hi

Please get back to me with the results of the SPI pin setting test.

As for "SD card task", I was referring to your own task, as I initially thought you had given the SD card task higher priority than the BLE and MAX_PRIORITIES tasks, but that's my bad.

You can check out this case, where my colleague has combined the ble_app_uart and fatfs example to write all strings received over BLE to an SD card. I was unable to find a BLE + SD card example that also uses FreeRTOS, so if you want/need to use FreeRTOS you can use Jørgen's example as a template or reference.

Best regards,

Simon

[snowfield]

Dear Simonr:

    The demo code need SDK14. My current version is 16. So I need download corresponding environment. Since the network speed is very slow. I am afraid I can not test the demo today. I will report result later.