PHY update request not triggered in peripheral in case of PHY_CODED

[masterLee]

Hi, my two nRF52840 devices are set as peripheral and central respectively. Both devices use nRF52 SDK.

I try to update the PHY in the two devices, after they are connected, by giving the central a serial USB command like in the following code part

and I would expect that a BLE_GAP_EVT_PHY_UPDATE_REQUEST event to trigger in the peripheral device. Is this correct?

case 10:

    NRF_LOG_INFO("Request PHY update for conn_handle: %d.", connHandle);
    ble_gap_phys_t const phys =
    {
        .rx_phys = BLE_GAP_PHY_CODED, 
        .tx_phys = BLE_GAP_PHY_CODED, 
    };
    err_code = sd_ble_gap_phy_update(connHandle, &phys);
    APP_ERROR_CHECK(err_code);
   
 break;

The problem is that the BLE_GAP_EVT_PHY_UPDATE_REQUEST is not triggered in the peripheral device after I have executed the phy update function in the central. The strange thing is that it occurs only when I want to change the PHY to BLE_GAP_PHY_CODED (as in the code before)

When I try to set the PHY to 1MBPS (in the previous code) the BLE_GAP_EVT_PHY_UPDATE_REQUEST in the peripheral is triggered correctly (i check it in the debugger) once I execute the serial command in the central.

So, my question is why BLE_GAP_EVT_PHY_UPDATE_REQUEST doesn't trigger in the first case ( BLE_GAP_PHY_CODED ) in the peripheral?

What am I doing wrong?

 

[Jared]

Hi,

That looks correct, is the  BLE_GAP_EVT_PHY_UPDATE event generated at the central when you send the PHY request?

Can you take sniffer trace with nRF Sniffer when you send the PHY request? That could highlight what the issue is,

regards

Jared 

[masterLee]

Hi Jared

Yes the BLE_GAP_EVT_PHY_UPDATE is triggered every time on the central side . But the   BLE_GAP_EVT_PHY_UPDATE_REQUEST on the peripheral side is trigerred only in case of PHY_1MBPS. When I request PHY_Coded it does not trigger.

I will try the sniffer as you say

[Jong yoon lee]

Any Updates here? Jared