nrf5340 is unable to trigger rpmsg(ipc) transfer

Question

Hi, 
 I have quite demanding SPI device which should send its data over BLE. Thanks to throughput example i was able to achieve maximum transfer speeds for synthetic tests (without SPI). Sadly after adding real data input, I noticed that no transfer is executed until I finish my commands. 
 Thanks to SystemView I was able to narrow this problem to one part of configuration -> rpmsg. 
 
 Colors: 
 Green -> spi thread Yellow -> bt_hci thread Orange -> ble host TX Red (small squere in top) - IRQ 58 from probably ipc, but i wasnt able to find it in manual (not listed) Blue - probably openAmp mailing work queue thread purple - systemwork queue 
 
 SystemView Data Log 4010.BleProblem.dat 
 
 Here is repo with configs etc. https://github.com/DuMaM/bitly_nrf5x

Dumam · Accepted Answer

Hi, The issue persists. I was able to partially overcome it, by changing net core BLE Stack implementation in hci_rpmsg_nrf5340dk_nrf5340_cpuapp.conf to: # select ll layer
CONFIG_BT_LL_SW_SPLIT=y
CONFIG_BT_LL_SOFTDEVICE=n
#CONFIG_BT_CTLR_SDC_MAX_CONN_EVENT_LEN_DEFAULT=4000000
 
 After this change, I was able to achieve 1,1Mbps of throughput. I still will be fighting with this code to reach 1,4Mbps, but It can be hard to do so. According to System View, not much room left for processing. 
 If I find something useful, I will post it here.

nrf5340 is unable to trigger rpmsg(ipc) transfer

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