connection interval setup issue

[TH_HT]

Our project uses nRF52832, and the bluetooth connection has two modes as follows:

one is low-power standby mode connection interval=1000ms;

One is data transmission mode, connection interval=7.5ms;

We call sd_ble_gap_conn_param_update to set up the connection interval on the peripheral side, and we find that sd_ble_gap_conn_param_update is often incorrectly return as "NRF_ERROR_BUSY", and the retry setup also fails. Below is the setup source code, please help how to handle NRF_ERROR_BUSY to ensure that we can setup the connection interval successful, to enter the desired pattern every time. thank you！

#define MIN_CONN_INTERVAL               MSEC_TO_UNITS(7.5, UNIT_1_25_MS)

#define MAX_CONN_INTERVAL               MSEC_TO_UNITS(7.5, UNIT_1_25_MS)

#define MIN_CONN_INTERVAL_LP               MSEC_TO_UNITS(1000, UNIT_1_25_MS)

#define MAX_CONN_INTERVAL_LP               MSEC_TO_UNITS(1000, UNIT_1_25_MS)

static void gap_conn_param_update(int mode)

{

    uint32_t                err_code;

    ble_gap_conn_params_t   gap_conn_params;

    if(mode) {

        NRF_LOG_ERROR("Updating connection parameters as low power mode..");

        gap_conn_params.min_conn_interval = MIN_CONN_INTERVAL_LP;

        gap_conn_params.max_conn_interval = MAX_CONN_INTERVAL_LP;

        gap_conn_params.slave_latency     = SLAVE_LATENCY;

        gap_conn_params.conn_sup_timeout  = CONN_SUP_TIMEOUT;

    } else {

        NRF_LOG_ERROR("Updating connection parameters as fast mode..");

        gap_conn_params.min_conn_interval = MIN_CONN_INTERVAL;

        gap_conn_params.max_conn_interval = MAX_CONN_INTERVAL;

        gap_conn_params.slave_latency     = SLAVE_LATENCY;

        gap_conn_params.conn_sup_timeout  = CONN_SUP_TIMEOUT;

    } else {

        return;

    }

    err_code = sd_ble_gap_conn_param_update(m_conn_handle, &gap_conn_params);

    if (err_code != NRF_SUCCESS)

    {

        NRF_LOG_ERROR("sd_ble_gap_conn_param_update() failed: 0x%x.", err_code);

    }

}

[KoFuKu]

Hi TH_HT,

How do you use this code? Are you able to use your code for dynamic change in connection parameters or you are setting connection parameters only once in initialization.

I am looking for solution to change connection parameters when i need a fast data transfer and then back to connection parameters for low power.

EDIT1: Ok. I guess you call this function twice. Once as gap_conn_param_update(1) and second time as gap_conn_param_update(0). I tried this and it works, but i have naw a few bugs.

Can you tell me what is the best time to do connection parameters change.