haukepetersen opened a new issue #879: URL: https://github.com/apache/mynewt-nimble/issues/879
While doing a sequence of energy measurements, I noticed some strange behavior on the `nrf52840dk` (`nrf52840`). While running a simple application that sends out legacy advertisements every 500ms, I can see CPU activity between two advertisement events where there should be none. This happens in non-deterministic intervals. Trace A (ADV interval: 500ms, payload 3 byte, non-connectable, non-discoverable):  Trace B (ADV interval: 500ms, payload 3 byte, undirected-connectable, general discoverable)  Running the exact same application on the `nrf52dk` (`nrf52832`) does not show this behavior, on that board the trace looks as expected. So from that I think this might be a PHY related issue on the `nrf52840`?! I also wonder if this could be related to #767? Background infos: - running NimBLE (dba097972d28701c10b9af2a48af7d924c9cfca3) @ RIOT (35b6ccedf31f10a5f8e4f97609ad5b10c28bdc34) - the application simply calls `ble_gap_adv_start()` with the following params: ``` struct ble_gap_adv_params adv_params = { .conn_mode = BLE_GAP_CONN_MODE_NON, // or BLE_GAP_CONN_MODE_UND for trace B .disc_mode = BLE_GAP_DISC_MODE_NON, // or BLE_GAP_DISC_MODE_GEN for trace B .itvl_min = BLE_GAP_ADV_ITVL_MS(500), .itvl_max = BLE_GAP_ADV_ITVL_MS(500), }; ``` - No additional (user) threads - NimBLE is configured as stated in `porting/targets/riot/syscfg.yml` with the following changes: ``` CFLAGS += -DMYNEWT_VAL_BLE_LL_TX_PWR_DBM=0 CFLAGS += -DMYNEWT_VAL_BLE_LL_MAX_PKT_SIZE=251 CFLAGS += -DMYNEWT_VAL_BLE_LL_CFG_FEAT_DATA_LEN_EXT=1 CFLAGS += -DMYNEWT_VAL_BLE_L2CAP_COC_MPS=200 ``` ---------------------------------------------------------------- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. For queries about this service, please contact Infrastructure at: [email protected]
