Hello.
In the BLE software under development, the device uses nRF52840 and uses s140 v7.2.0.
Please tell me the processing time for interrupts used in SoftDevice.
According to the SoftDevice specifications, there are three types of interrupt levels: priority 0, 1, and 4, but the information I want to know is the WORST interrupt occupancy time for each level.
Priority 0 is written as SoftDevice timing critical, I assume this refers to the timeslot API using the timer 0 peripheral and the transmit/receive interrupts from the wireless peripheral.
Priority 1 is written as SoftDevice memory protection, so I understand that this is a fail-safe purpose that will not occur as long as the memory used by SD and APP are separated.
Priority 4 is for API calls and non-time-critical processing, but do all SD APIs go through this interrupt?
Also, what exactly does non-time-critical processing mean?
I believe that this is a callback event from SD via an observer.
Actually, I think the only way is to actually measure it, but if so, please tell me how to measure it for each interrupt level.
For reference, the BLE parameters are listed below.
| SCAN_TYPE_ACTIVE | 1 |
| SCAN_INTERVAL | 20 |
| SCAN_INTERVAL_AFTER_TIMEOUT | 20 |
| SCAN_WINDOW | 20 |
| SCAN_DURATION | 0 |
| SCAN_DURATION_AFTER_TIMEOUT | 0 |
| CENTRAL_MIN_CONN_INTERVAL | 15 |
| CENTRAL_MAX_CONN_INTERVAL | 15 |
| CENTRAL_SLAVE_LATENCY | 0 |
| CENTRAL_CONN_SUP_TIMEOUT | 500 |
| PERIPHERAL_MIN_CONN_INTERVAL | 50 |
| PERIPHERAL_MAX_CONN_INTERVAL | 50 |
| PERIPHERAL_SLAVE_LATENCY | 0 |
| PERIPHERAL_CONN_SUP_TIMEOUT | 4000 |
* All units are msec.
Best regards.
