how to enable 2mbps

[cann0021]

Hello everybody.

I have two boards. I have been trying to build a communication between my boards for a time. I could not manage to have 2mbps data transfer rate. 

Boards                    : nRF52832 DK(PCA10040) and nRF52840 Dongle(PCA10059)
SDK version           : 15.3.0
SoftDevice Version : 6.1.1
SoftDevices            : s132 for PCA10040 and s140 for PCA10059
Examples               : ble_app_uart and ble_app_uart_c

1-) How can I enable 2mbps data transfer rate ? I have tried various methods like sending PHY updating requests etc. But I guess I am doing something wrong. What is the correct way to do it?
2-) Let's say I managed to have 2mbps data transfer rate. How can I test it ? How to verify that I am having 2mbps data transfer rate ?

Sincerely.

[cann0021]

Functions you wanted to check:

static void advertising_init(void)
{
    uint32_t               err_code;
    ble_advertising_init_t init;

    memset(&init, 0, sizeof(init));

    init.advdata.name_type          = BLE_ADVDATA_FULL_NAME;
    init.advdata.include_appearance = false;
    init.advdata.flags              = BLE_GAP_ADV_FLAGS_LE_ONLY_LIMITED_DISC_MODE;

    init.srdata.uuids_complete.uuid_cnt = sizeof(m_adv_uuids) / sizeof(m_adv_uuids[0]);
    init.srdata.uuids_complete.p_uuids  = m_adv_uuids;

    init.config.ble_adv_fast_enabled  = true;
    init.config.ble_adv_fast_interval = APP_ADV_INTERVAL;
    init.config.ble_adv_fast_timeout  = APP_ADV_DURATION;
    init.evt_handler = on_adv_evt;

    init.config.ble_adv_primary_phy      = BLE_GAP_PHY_2MBPS; 
    init.config.ble_adv_secondary_phy    = BLE_GAP_PHY_2MBPS; 
    init.config.ble_adv_extended_enabled = true;             
   

    err_code = ble_advertising_init(&m_advertising, &init);
    APP_ERROR_CHECK(err_code);

    ble_advertising_conn_cfg_tag_set(&m_advertising, APP_BLE_CONN_CFG_TAG);
}

static void advertising_start(void)
{
    uint32_t err_code = ble_advertising_start(&m_advertising, BLE_ADV_MODE_FAST);
    printf("err_code: %d\r\n",err_code); nrf_delay_ms(500);
    APP_ERROR_CHECK(err_code);
}

I am still getting error_code:7

[astella]

Hi, in order to activate 2Mbps phy, you coud get an ordinary 1 Mbps example. Then, after a ble connection is established, in the ble event handler 'on_connect' like event you just call something like this

m_test_params.phys.tx_phys = BLE_GAP_PHY_2MBPS;

m_test_params.phys.rx_phys = BLE_GAP_PHY_2MBPS;                        

err_code = sd_ble_gap_phy_update(m_conn_handle, &m_test_params.phys);

And the trick is done.. 

You can add BLE_GAP_EVT_PHY_UPDATE (and not BLE_GAP_EVT_PHY_UPDATE_REQUEST in this case)

in you ble_evt_handler so to get a confirmation about the phy modification, that has been initiated when calling sd_ble_gap_phy_update

To sum up, about using 2Mbps phy, according to my tests now it could be achieved without using a special flag set during advertisement phase, but after the ble connection is established, I just call in the ble device sd_ble_gap_phy_update. So this command notifies the host that the device wants to change phy, if the host just agrees BLE_GAP_EVT_PHY_UPDATE is generated from the device ble stack. So that device knows if what has requested has gone ok. 

The Nordic Sniffer tool shows a change in the used phy

Maybe there is another procedure, and a device can indeed advertise its 2M capabilities,

then BLE_GAP_EVT_PHY_UPDATE_REQUEST is generated, to finish phy modification in this case (sd_ble_gap_phy_update is used to finish the procedure in this case).

But I couldn't find an example of that.

Hope that Nordic can provide a very simple explanation about this point.

[astella]

infocenter.nordicsemi.com/index.jsp

[Parker Bondi]

Is this thread still relevant today for setting up a 2MBPS UART Peripheral?