RE: Radio Test clarification

Andreas — Tue, 12 Feb 2019 13:06:02 GMT

Hi,

1. Unless you send a stop command(or do nothing), the test will continue indefinitely, no restart i needed.

2. The modulated TX carrier test sets the following shorts

NRF_RADIO->SHORTS     = RADIO_SHORTS_END_DISABLE_Msk | RADIO_SHORTS_READY_START_Msk | \
                            RADIO_SHORTS_DISABLED_TXEN_Msk;

Which basically makes the radio automatically start transmitting a packet when it is ready (RADIO_SHORTS_READY_START), automatically disable when the packet has been transmitted (RADIO_SHORTS_END_DISABLE) and automatically enable TX when it has been disabled (RADIO_SHORTS_DISABLED_TXEN). This keeps the radio constantly shutting down, and starting back over again. I do not know the numbers off the top of my head, but time spent transmitting the packet is 1-2 ms (2Mbps and 1 Mbps, respectively), time spent between the end of one packet and the start of the next one is ~40 µs. This should give ~98% duty-cycle, or thereabout.

You could probably increase the duty-cycle even more by instead of RADIO_SHORTS_END_DISABLE set RADIO_SHORTS_END_START to have the radio immediately go into transmitting another packet once one is finished, without having to disable the radio. You should confer with the test facility before doing so though, as they might want to make sure there is no spur or effects during enable/disable.

Best regards,

Andreas