nrf52 gzll performance

[wizath]

Hi,

I want to change my gzll receivers from NRF51 to NRF52. But I've done some performance testing to see if it is really necessary. And here is my problem:

When using nrf52 gzll receiver, I'm getting only about 460 packets/s. When using NRF51 gzll receiver, the packet count is about 530 / second.

I'm using the same settings on both boards, pca10028 and pca10040 accordingly. On device side there is just spamming of 32 byte packets. Anyone have clue what can cause such difference in performance?

nrf_gzll_init(NRF_GZLL_MODE_HOST);
nrf_gzll_set_xosc_ctl(NRF_GZLL_XOSC_CTL_MANUAL);

nrf_gzll_set_datarate(NRF_GZLL_DATARATE_2MBIT);
nrf_gzll_set_timeslot_period(600);
nrf_gzll_set_timeslots_per_channel(4);
nrf_gzll_set_sync_lifetime(40);
nrf_gzll_set_timeslots_per_channel_when_device_out_of_sync(10);
nrf_gzll_set_device_channel_selection_policy(NRF_GZLL_DEVICE_CHANNEL_SELECTION_POLICY_USE_CURRENT);
nrf_gzll_set_base_address_0(DEFAULT_ADDRESS);

[ovrebekk]

Hi

I can't think of any obvious reason why the nRF52 receiver would be slower, but there could be some timing differences between the two.

Could you try reducing the timeslot on the device side slightly (try reducing it by 10-20us). This can some times help on performance, when there are timing differences between the device and host.

Best regards