Configure nRF52840 Dongle working parameters for "heart_rate_collector" example in windows 10

[Banban]

Hi,

We are using nRF52840 Dongle to receive BLE peripheral Device 240 Bytes notifications for Win10 program. And we used "pc-ble-driver-4.1.1\examples\heart_rate_collector"(win10) as starting point.

"Bluetooth Low Energy" APP in "nRF Connect" can configure several parameters, such as data length, mtu and phy data rate:

Is there any API to configure these parameters for "heart_rate_collector" in win10?

Best regards

[Jørgen Holmefjord]

Hi,

pc-ble-driver implements our serialization libraries, which gives you access to the full softdevice API. You can add functionality in the examples in the same way that the API is used in our SDK.

• sd_ble_gap_phy_update()
• sd_ble_gap_data_length_update()
• sd_ble_gattc_exchange_mtu_request()
• sd_ble_gap_conn_param_update()

Note that the application needs to handle the corresponding events to the API calls for the changes to work correctly.

Best regards,
Jørgen

[Banban]

Hi,

The first time,

static uint32_t ble_cfg_set(uint8_t conn_cfg_tag)

{

...

    ble_gap_data_length_params_t const dlp =
    {
        .max_rx_octets = 251,
        .max_tx_octets = 251,
        .max_rx_time_us = 2120,
        .max_tx_time_us = 2120,
    };
    error_code = sd_ble_gap_data_length_update(m_adapter, m_connection_handle, &dlp, NULL);//error_code==0x3001

...

}

But "0x3001' is not defined  in "Global Error". What does "0x3001" mean?

The second time,

static uint32_t ble_cfg_set(uint8_t conn_cfg_tag)
{
    const uint32_t ram_start = 0; // Value is not used by ble-driver
    uint32_t error_code;
    ble_cfg_t ble_cfg;

    memset(&ble_cfg, 0x00, sizeof(ble_cfg));
    ble_cfg.conn_cfg.conn_cfg_tag = conn_cfg_tag;
    ble_cfg.conn_cfg.params.gap_conn_cfg.event_length = 24;
    error_code = sd_ble_cfg_set(m_adapter, BLE_CONN_CFG_GATTC, &ble_cfg, ram_start);//error_code == NRF_SUCCESS

...

}

static void ble_evt_dispatch(adapter_t* adapter, ble_evt_t* p_ble_evt)

{

...

switch (p_ble_evt->header.evt_id)
{

    case BLE_GAP_EVT_DATA_LENGTH_UPDATE_REQUEST:

    uint16_t i1 = p_ble_evt->evt.gap_evt.params.data_length_update.effective_params.max_rx_octets;
    uint16_t i2 = p_ble_evt->evt.gap_evt.params.data_length_update.effective_params.max_tx_octets;
    uint16_t i3 = p_ble_evt->evt.gap_evt.params.data_length_update.effective_params.max_rx_time_us;
    uint16_t i4 = p_ble_evt->evt.gap_evt.params.data_length_update.effective_params.max_tx_time_us;
    printf("i1=%d, i2=%d, i3=%d, i4=%d\n", i1, i2, i3,i4);//i1==251, i2==251, i3==2120, i4==2120

    ble_gap_data_length_params_t const dlp =
    {
        .max_rx_octets = 251,
        .max_tx_octets = 251,
        .max_rx_time_us = 2120,
        .max_tx_time_us = 2120,
    };

    ble_gap_data_length_limitation_t dll;
    uint32_t error_code = sd_ble_gap_data_length_update(m_adapter, m_connection_handle, &dlp, &dll);//error_code ==NRF_ERROR_RESOURCES

    i1 = dll.rx_payload_limited_octets;//i1==52428
    i2 = dll.tx_payload_limited_octets;//i2==52428
    i3 = dll.tx_rx_time_limited_us; //i3==52428

}

...

}

"event_length" has been configured successfully in In ble_cfg_set() , but when I called sd_ble_gap_data_length_update() in "case BLE_GAP_EVT_DATA_LENGTH_UPDATE_REQUEST", it returned NRF_ERROR_RESOURCES.

Best regards

[Jørgen Holmefjord]

Hi,

0x3001 means BLE_ERROR_NOT_ENABLED. Did you enable the softdevice first?

Did you try increasing the event_length parameter? The API documentation say this for the NRF_ERROR_RESOURCES error:

NRF_ERROR_RESOURCES

The connection event length configured for this link is not sufficient for the requested parameters. Use sd_ble_cfg_set with BLE_CONN_CFG_GAP to increase the connection event length. Inspect p_dl_limitation to see where the limitation is.

Best regards,
Jørgen

[Banban]

Hi,

Thank you for you reply.

Check my program, please. At the second time, I configured event_length in ble_cfg_set(). And sd_ble_cfg_set() returned NRF_SUCCESS.

But in ble_evt_dispatch(), sd_ble_gap_data_length_update still returned NRF_ERROR_RESOURCES error.

Best regards.

[Jørgen Holmefjord]

I did look at your code. I can only see that you tried setting it to 24. Try increasing it, for instance to 320.