Using sd_ble_gatts_hvx() in timer1 interrupt service cause the hardfault

[zqclzz]

Condition: nRF52, SDK11,s132, SDS v2.0. Using the sd_ble_gatts_hvx() in timer1 interrupt service(timer1 interrupt priority is set to level 3) will result in hardfault. While, using the sd_ble_gatts_hvx() in main loop will not cause any error. Why? How can I to use sd_ble_gatts_hvx() in timer1?

[RK]

This gets discussed multiple times a week. You can't call SVC calls from an interrupt level higher than the SVC interrupt and all sd_ functions are implemented with SVC calls. If you do the cortex hardfaults. Interrupt level 3 is higher than the SVC interrupt level so either you make your timer interrupt lower priority or you bounce it to a lower priority level (eg main thread) and process it there.

[Susheel Nuguru]

I am accepting this because this has been discussed many times and the answer is very accurate.