nRF52833 LR(Long range testing) Set UP for (Coded PHY)

RE: nRF52833 LR(Long range testing) Set UP for (Coded PHY)

Muhammad Usman — Thu, 07 Apr 2022 13:10:52 GMT

Hi Simon

Thank you for sure!

RE: nRF52833 LR(Long range testing) Set UP for (Coded PHY)

Simonr — Thu, 07 Apr 2022 12:57:23 GMT

This case is more than a year old, so please create a new ticket on DevZone where you explain your issue in detail, and show what error code you're seeing. Please also add what SDK version, etc. you're using for your project.

Best regards,

Simon

RE: nRF52833 LR(Long range testing) Set UP for (Coded PHY)

Muhammad Usman — Thu, 07 Apr 2022 09:46:19 GMT

Hi Simonr

Thank you for the nice post! Can you please help me to migrate from 52840 to 52833? I did for the example project but it generate errors of missing files like pca10100.h / nrf52833.h and other files. I added all the missing files but still the error. Although migration from 52840 to 52833 is simple, we just have to change a few parameters in the .emproject file and it worked for me with other examples but not with this.

Can you please help me in this regard?

Thanks

RE: nRF52833 LR(Long range testing) Set UP for (Coded PHY)

Swapnil Karkare — Mon, 12 Oct 2020 10:15:16 GMT

Hi Simon,

Thanks for your support.

Best Regards,

Swapnil

RE: nRF52833 LR(Long range testing) Set UP for (Coded PHY)

Simonr — Mon, 12 Oct 2020 08:34:05 GMT

Hi again

Glad to hear that you're able to advertise/scan as intended now. Our SoftDevice only supports the (S=8) PHY as of yet, so there is no option to test with the (S=2) 500kbps setting I'm afraid.

Best regards,

Simon

RE: nRF52833 LR(Long range testing) Set UP for (Coded PHY)

Swapnil Karkare — Mon, 12 Oct 2020 08:09:49 GMT

Hi Simon,

Thanks for guidance. I am able to implement both advertising on nRF52840 and scanning on nRF52833.

There one more query regarding bit rate transmission. We want to test it on both (S=8) 125Kbps and (s=2) 500Kbps setting.

How can we set this setting?

RE: nRF52833 LR(Long range testing) Set UP for (Coded PHY)

Simonr — Fri, 09 Oct 2020 08:32:03 GMT

Okay, sorry about the misunderstanding.

In order to scan using Coded PHY, you also need to set the NRF_BLE_SCAN_BUFFER to BLE_GAP_SCAN_BUFFER_EXTENDED_MIN (which is 255). What kind of failures are you seeing when you start scanning?

Please check out this modified ble_app_uart central example that has been modified to scan for Coded PHY advertisements if you need a template.

devzone.nordicsemi.com/.../2311.Long_5F00_range_5F00_15.2.zip

Best regards,

Simon

RE: nRF52833 LR(Long range testing) Set UP for (Coded PHY)

Swapnil Karkare — Thu, 08 Oct 2020 16:26:20 GMT

Hi Simon,

We tested Long Range advertising mode.

I am facing issues in Long range scanning.

Configuration is set as below

init_scan.connect_if_match = false; // true non connectable mode
init_scan.conn_cfg_tag = APP_BLE_CONN_CFG_TAG;
m_scan.scan_params.extended =1;
m_scan.scan_params.active = 0x01;
m_scan.scan_params.scan_phys = BLE_GAP_PHY_CODED;
m_scan.scan_params.filter_policy = BLE_GAP_SCAN_FP_ACCEPT_ALL;
m_scan.scan_params.interval = interval; // scanning interval
m_scan.scan_params.window = window; // scanning window

if(nrf_ble_scan_init(&m_scan, &init_scan, scan_evt_handler) != NRF_SUCCESS )
{
APP_ERROR_CHECK(err_code);
err_code = NRF_FAIL;
}

else if(nrf_ble_scan_filters_enable(&m_scan, NRF_BLE_SCAN_NAME_FILTER, true) != NRF_SUCCESS)
{
APP_ERROR_CHECK(err_code);
err_code = NRF_FAIL;
}

Interval and scanning window is set to 10 ms for testing purpose.

We are getting failures at Scan start function.

nrf_ble_scan_start(&m_scan);

Could please suggest what may be the cause of failures?

RE: nRF52833 LR(Long range testing) Set UP for (Coded PHY)

Simonr — Thu, 08 Oct 2020 07:25:15 GMT

Quite a few mobile phones (including the OnePlus 6) states that they support Coded PHY, but are not able to scan and connect to devices advertising in the Coded PHY. Generally, only the latest high-end models.

It should not be a problem migrating a nRF52840 project to the nRF52833 at a later point.

In order to set up long range advertising, you need to do the following in your advertising initialization:

adv_params.primary_phy and adv_params.secondary_phy must be set to BLE_GAP_PHY_CODED
The advertising flag need to be set to adv_data.flags = BLE_GAP_ADV_FLAGS_LE_ONLY_GENERAL_DISC_MODE;
The advertising type needs to be set either to BLE_GAP_ADV_TYPE_EXTENDED_NONCONNECTABLE_SCANNABLE_UNDIRECTED or BLE_GAP_ADV_TYPE_EXTENDED_CONNECTABLE_NONSCANNABLE_UNDIRECTED
You also need to make sure that scan response data is set to NULL, as this is not supported in the Coded PHY.

This should already be taken care of in the long range demo that you have linked to though.

Best regards,

Simon

RE: nRF52833 LR(Long range testing) Set UP for (Coded PHY)

Swapnil Karkare — Wed, 07 Oct 2020 11:22:58 GMT

Hi,

I want to add 2 more things.

1. We want to implement Long range scanning on nRF52833 chip. But simplicity we want to test in nRF52840 as lots info available on nRF52840. later we migrate on nRF52833.

2. How can I set up Data rate to 125 Kbit/s(LE Coded S=8)?