Example Radio Transmitter / Receiver on 52840

[Eva_VdV]

Hi,

I am using 2 development kits 52840-DK.

I run the examples projects transmitter ( pca1056 ) and receiver. It works,

In an attempt to get longer range I increased the TX power In radio config.c

  NRF_RADIO->TXPOWER   = (RADIO_TXPOWER_TXPOWER_Pos8dBm << RADIO_TXPOWER_TXPOWER_Pos);

Examples still work.

To extend the range i try switching to RADIO_MODE_MODE_Ble_LR125Kbit instead of RADIO_MODE_MODE_Nrf_1Mbit.

Noting received anymore.

I changed the while loop in the transmitter to

    while (NRF_RADIO->EVENTS_PHYEND == 0U)
    {
        // wait
    }

as stated in some posts here.

Address is set to 0.

    NRF_RADIO->RXADDRESSES = RADIO_RXADDRESSES_ADDR0_Enabled << RADIO_RXADDRESSES_ADDR0_Pos;
    NRF_RADIO->TXADDRESS   = (0x00 << RADIO_TXADDRESS_TXADDRESS_Pos) & RADIO_TXADDRESS_TXADDRESS_Msk;

 I also tried using the init from the BLE_DTM example. same result works in 1MB 2MB but not in 500 or 125kbps.

Is there something else I am missing?

regards,

Eva

[Håkon Alseth]

Hi Eva,

 

There's added settings that needs to be set in NRF_RADIO->PCNF0. If you need to evaluate long range, I would recommend that you look at this example:

https://devzone.nordicsemi.com/f/nordic-q-a/43404/how-can-i-use-a-long-range-mode-in-the-proprietary-mode-in-the-nrf52840/170283#170283

 

Could you try this and see if this works better for you?

 

Kind regards,

Håkon

[Eva_VdV]

Hi,

Thanks for the reply.

I used the config from that example, at first it didn't work either.

But the problem appears to be in de read_packet function.

PHYEND and EVENTS_END never seem to come.

 I changed the sequence simular to what that example does in the IRQ function, then packets arrive.

    NRF_RADIO->EVENTS_READY = 0U;
    // Enable radio and wait for ready
    NRF_RADIO->TASKS_RXEN = 1U;

    while (NRF_RADIO->EVENTS_ADDRESS == 0U)
    {
        // wait
    }
    NRF_RADIO->EVENTS_ADDRESS = 0;

    while( NRF_RADIO->EVENTS_DISABLED == 0 )
    {
    }
    NRF_RADIO->EVENTS_DISABLED = 0;

    if (NRF_RADIO->CRCSTATUS == 1U)
    {
        result = packet;
    }

Thanks.

[Dmitry]

Hi Eva,

two points to check:

1. Ensure that your DK is not a preview one (should be V1.0.0 or later) - LR won't work at all on preview board.

2. Ensure that you have configured PCNF0 and other registers properly. Here is a working example for 125kbit PHY.