__disable_irq cause fault

[Omri Friedman]

i am using SD S140.

i have a 300us period that must take 300us, no more, no less.

for this reason i must call __disable_irq().

when i do it i sometimes get app_error_fault_handler called.

i know i should not use __disable_irq(), but i cannot afford SD to interrupt me (i see that worst take can take 250us during BLE connection).

1. are you familiar with faults generated from this reason?

2. how can i guarantee exact 300us timing otherwise?

 thanks 

[Hung Bui]

Hi Omri, 
Another option (if you don't want to wait for radio notification as suggested by Jorg) is to use radio timeslot. 
You can have a look here: https://infocenter.nordicsemi.com/topic/sds_s132/SDS/s1xx/concurrent_multiprotocol_tsl_api/concurrent_multiprotocol_tsl_api.html?cp=4_7_3_0_8_1