change phy in mesh

[kassianson]

I'm working with the nRF52840 PDK and I'm wondering how to change the PHY (preferably to CODED) in a Mesh. Has that been implemented yet? Or when can we expect this feature?

[Hung Bui]

The following modification worked for me:

1. In advertise.c, set_default_broadcast_configuration() change radio_mode to use RADIO_MODE_NRF_62K5BIT instead of RADIO_MODE_BLE_1MBIT.

2. In scanner.c, scanner_config_reset() change scanner_config_radio_mode_set() to use RADIO_MODE_NRF_62K5BIT instead of RADIO_MODE_BLE_1MBIT.

3. In radio_config.c, radio_config_config() add the following code at the end:

    if (p_config->radio_mode==RADIO_MODE_NRF_62K5BIT )
   
    {
     NRF_RADIO->PCNF0 |=(
    
                    ((RADIO_PCNF0_PLEN_LongRange << RADIO_PCNF0_PLEN_Pos) & RADIO_PCNF0_PLEN_Msk) |
                    ((2 << RADIO_PCNF0_CILEN_Pos) & RADIO_PCNF0_CILEN_Msk) |
                    ((3 << RADIO_PCNF0_TERMLEN_Pos) & RADIO_PCNF0_TERMLEN_Msk) );
           
    }
   

4.In broadcast.c, time_required_to_send_us() add:

    if (radio_mode == RADIO_MODE_NRF_62K5BIT)
    {
        packet_length_in_bytes += RADIO_PREAMBLE_LENGTH_LR_EXTRA_BYTES;
    }

And define RADIO_PREAMBLE_LENGTH_LR_EXTRA_BYTES = 9.

Change 5th element in radio_mode_to_us_per_byte[] from 128 to 64.

Let us know if you don't achieve longer range with this patch.

[inv4]

Hi, is this method still working on Mesh v4?, Im not getting good results, I get like 3 or 4 meters with 1 wall, with zigbee i was getting like 12 meters with 2 or 3 walls.

[Sean Taylor]

I tested these edits on Mesh V4.0.0 today and they appear to result in an increase in range - and - nice surprise - very little degradation to throughput / message roundtrip latency.

[bivay]

please support if in this case