DECT NR+ and DPPI

[nir_g]

Hi there,

Is it possible to have the DECT NR+ modem trigger events via DPPI? For instance, I'd like to capture a Timer value *exactly* when nrf_modem_dect_phy_time_get() takes the modem time; or when the PCC callback (void (*pcc)(const uint64_t *time, const struct nrf_modem_dect_phy_rx_pcc_status *status, const union nrf_modem_dect_phy_hdr *hdr)) is called - I'd like to have a capture of a Timer *exactly* at the same time the PCC arrives.

Without this, I have to create mapping (e.g. PLL) between the system timers and the modem's, and use inexact measurements when these modem functions are called or call-back.

Thank you in advance,

Nir

[Benjamin]

Hi Nir,
In January we will release a new firmware (1.2.0) that will help with this issue. It will include a new clock synchronization API. This API can provide an application event tied more closely to the modem tick count, based on a COEX pin interrupt.

It would allow for one chip to output a COEX1 1PPS signal and the other chip to synchronize its clock using that signal routed to the SIM_DET pin. The devices can then exchange information in software about how the 1PPS pulse relates to frame and slot timing.

You will also need to configure the hardware accordingly, routing the COEX pin to the SIM_DET pin. This is not possible on the DK, as SIM_DET is not exposed.

Best regards,
Benjamin