how to enable 2mbps

RE: how to enable 2mbps

Parker Bondi — Fri, 16 Feb 2024 22:09:59 GMT

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

RE: how to enable 2mbps

astella — Fri, 11 Sep 2020 10:05:32 GMT

infocenter.nordicsemi.com/index.jsp

RE: how to enable 2mbps

astella — Fri, 11 Sep 2020 07:44:56 GMT

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.

RE: how to enable 2mbps

cann0021 — Tue, 19 Nov 2019 08:52:25 GMT

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

RE: how to enable 2mbps

cann0021 — Tue, 19 Nov 2019 08:29:02 GMT

I decided to use the most current SDK (16.0.0). I wrote a function that works to test throughput. It works in peripheral side. Please tell me if I am doing something uncorrect.

uint16_t data_point_to_transmit = 244;
uint8_t data_to_transmit[244]   = {0};

void throughput_test() {
  static int payload_per_second = 0;
  ret_code_t my_err_code = 0;
  ret_code_t err_code;
    
  if (isConnected) 
  {
    do 
    {
      err_code = ble_nus_data_send(&m_nus, data_to_transmit, &data_point_to_transmit, m_conn_handle);
      if(err_code != NRF_SUCCESS){
        printf("err_code: %d\r\n",err_code);
      }
    } while ((err_code != NRF_ERROR_INVALID_STATE) && (err_code != NRF_ERROR_BUSY) && (err_code == NRF_SUCCESS));
    if (timer_flag == false) 
    {
      payload_per_second = payload_per_second + data_point_to_transmit;
    } 
    else 
    {
      timer_flag         = false;
      printf("Throughput: %d KB - %d Bytes - %d bits per second\r\n",
          payload_per_second / 1024,
          payload_per_second,
          payload_per_second * 8);
      
      payload_per_second = 0;
    }
  } 
  else 
  {
    payload_per_second = 0;
  }
}

for (;;)
    {
        throughput_test();
        idle_state_handle();
    }

I am getting an error (19). What is wrong with this ?

Best regards.

RE: how to enable 2mbps

cann0021 — Mon, 18 Nov 2019 13:14:04 GMT

Sorry, I clicked "Verify Answer" button mistakenly. I do not want that the ticket be closed.

RE: how to enable 2mbps

cann0021 — Mon, 18 Nov 2019 13:10:01 GMT

Hi Mr.Simonr.

I am using default SDK 15.3.0 examples. I have not changed anything from default _init() and _start() functions.

RE: how to enable 2mbps

Simonr — Thu, 14 Nov 2019 14:09:50 GMT

Can you upload the full advertising_init() and advertising_start() functions in your application so I can have a look?

error code 7 does indeed mean that you have an invalid parameter somewhere, so one or more of your m_adv_params. are not set correctly. For example, what is your interval set to? This must be between 0x0020 and 0x4000 to be valid.

Best regards,

Simon

RE: how to enable 2mbps

cann0021 — Thu, 14 Nov 2019 08:53:39 GMT

Hi, thanks for the response.

I have already added that code snippet into my code. As I said before, it causes FATAL_ERROR.

static void advertising_start(void) {
  uint32_t err_code = ble_advertising_start(&m_advertising, BLE_ADV_MODE_FAST);
  NRF_LOG_INFO("err_code: %d",err_code);
  APP_ERROR_CHECK(err_code);
}

It returns:

<info> app: err_code: 7

When I check the meaning of 7:

#define NRF_ERROR_INVALID_PARAM               (NRF_ERROR_BASE_NUM + 7)  ///< Invalid Parameter

It should not be hard that much to have 2 mbps transfer rate. I'm stuck here and I have to find a solution in 6 days.

RE: how to enable 2mbps

Simonr — Thu, 14 Nov 2019 07:06:10 GMT

Try adding the following to your advertising_init() function:

    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;

Best regards,

Simon

RE: how to enable 2mbps

cann0021 — Wed, 13 Nov 2019 12:40:43 GMT

For the peripheral, there is nothing like adv_params. Instead of it, I added init.config.ble_adv_primary_phy = BLE_GAP_PHY_2MBPS;

But now, it causes FATAL_ERROR.

RE: how to enable 2mbps

Simonr — Wed, 13 Nov 2019 07:39:35 GMT

On the peripheral side, you can add adv_params.primary_phy = BLE_GAP_PHY_2MBPS; to the advertising_init() function. On the central side, you can add .scan_phys = BLE_GAP_PHY_2MBPS to the ble_gap_scan_params_t function. You should also add

.rx_phys = BLE_GAP_PHY_2MBPS,

.tx_phys = BLE_GAP_PHY_2MBPS,

to the BLE_GAP_EVT_PHY_UPDATE_REQUEST.

Please check out this case for how to enable and check for Data Length Extension and MTU.

Best regards,

Simon

RE: how to enable 2mbps

cann0021 — Tue, 12 Nov 2019 15:07:46 GMT

Hello Mr. Simonr.

Thank you for the answer. How can I set BLE_GAP_PHY_2MBPS ? Where to set ? How can I enable Data Length Extension? By the way, I have already read that blog post. But how can I implement those things with nRF ?

RE: how to enable 2mbps

Simonr — Tue, 12 Nov 2019 14:13:27 GMT

Hello

To ensure 2Mbps, please make sure that the PHY you're using is BLE_GAP_PHY_2MBPS in both central and peripheral. In order to maximize the throughput, you should also sett the ATT MTU to 247 bytes, enable Data Length Extension (DLE), and increase your connection interval. You can check out this blog post, where the maximum throughout in BLE 5.0 has been tested using two nRF52840 chips.

Best regards,

Simon