I would like to call hvx function in my custom task.

[bigzero]

i using a ble_app_hrs_freertos example, nrf52

I inserted a new custom task.

if(pdPASS != xTaskCreate(main_thread, "MAIN", 32, NULL , 1, &m_main_thread))
{
   APP_ERROR_HANDLER(NRF_ERROR_NO_MEM);
}		

and in my custom task, called a sd_ble_gatts_hvx function. then i get a hardfault.

but, if i call in interrupt service routine or app_timer service routine, well done.

why?? do the hard fault occur?

i can't understand.

[Susheel Nuguru]

Hi,

You are creating your custom task with a priority "1!. Which is high and cannot call any sd_xx functions. Because sd_ble_gatts_hvx converts into SVC the ARM Cortex does not allow calling SVC (priority 2) from higher priority task (like your custom task).

Change the priority to 3 incase you want to make sd_xxx calls from your custom task.

if(pdPASS != xTaskCreate(main_thread, "MAIN", 32, NULL , 3, &m_main_thread))
{
   APP_ERROR_HANDLER(NRF_ERROR_NO_MEM);
}

[bigzero]

tnak you for reply.

i know that the priority 3 is high priority.

#define tskIDLE_PRIORITY ( ( UBaseType_t ) 0U ) and #define configTIMER_TASK_PRIORITY ( 2 )

the priority number 1 is low priority.

a task priority and a interrupt priority is different.