/*lint -emacro(524, MIN_CONN_INTERVAL) // Loss of precision */ #define MIN_CONN_INTERVAL MSEC_TO_UNITS(45, UNIT_1_25_MS) /**< Minimum connection interval (7.5 ms). */ #define MAX_CONN_INTERVAL MSEC_TO_UNITS(500, UNIT_1_25_MS) /**< Maximum connection interval (15 ms). */ #define SLAVE_LATENCY 0 /**< Slave latency. */ #define CONN_SUP_TIMEOUT BLE_GAP_CP_CONN_SUP_TIMEOUT_MAX /**< Connection supervisory timeout (3000 ms). */ #define FIRST_CONN_PARAMS_UPDATE_DELAY APP_TIMER_TICKS(5000, APP_TIMER_PRESCALER) /**< Time from initiating event (connect or start of notification) to first time sd_ble_gap_conn_param_update is called (5 seconds). */ #define NEXT_CONN_PARAMS_UPDATE_DELAY APP_TIMER_TICKS(30000, APP_TIMER_PRESCALER) /**< Time between each call to sd_ble_gap_conn_param_update after the first call (30 seconds). */ #define MAX_CONN_PARAM_UPDATE_COUNT 3 /**< Number of attempts before giving up the connection parameter negotiation. */ #define SEC_PARAM_BOND 1 /**< Perform bonding. */ #define SEC_PARAM_MITM 0 /**< Man In The Middle protection not required. */ #define SEC_PARAM_LESC 0 /**< LE Secure Connections not enabled. */ #define SEC_PARAM_KEYPRESS 0 /**< Keypress notifications not enabled. */ #define SEC_PARAM_IO_CAPABILITIES BLE_GAP_IO_CAPS_NONE /**< No I/O capabilities. */ #define SEC_PARAM_OOB 0 /**< Out Of Band data not available. */ #define SEC_PARAM_MIN_KEY_SIZE 7 /**< Minimum encryption key size. */ #define SEC_PARAM_MAX_KEY_SIZE 16 /**< Maximum encryption key size. */
I have used the Softdevice S130 2.0.1 and nRF5_SDK_12.3.0 the ble configuration code is based on the example of ble hids in the SDK
The custom nrf51822 board only consists of HFXTAL
static void ble_stack_init(void)
{
uint32_t err_code;
nrf_clock_lf_cfg_t clock_lf_cfg = {.source = NRF_CLOCK_LF_SRC_RC,
.rc_ctiv = 1,
.rc_temp_ctiv = 2,
.xtal_accuracy = 1};
// Initialize the SoftDevice handler module.
SOFTDEVICE_HANDLER_APPSH_INIT(&clock_lf_cfg, true);
ble_enable_params_t ble_enable_params;
err_code = softdevice_enable_get_default_config(CENTRAL_LINK_COUNT,
PERIPHERAL_LINK_COUNT,
&ble_enable_params);
APP_ERROR_CHECK(err_code);
// Check the ram settings against the used number of links
CHECK_RAM_START_ADDR(CENTRAL_LINK_COUNT, PERIPHERAL_LINK_COUNT);
// Enable BLE stack.
#if (NRF_SD_BLE_API_VERSION == 3)
ble_enable_params.gatt_enable_params.att_mtu = NRF_BLE_MAX_MTU_SIZE;
#endif
err_code = softdevice_enable(&ble_enable_params);
APP_ERROR_CHECK(err_code);
// Register with the SoftDevice handler module for BLE events.
err_code = softdevice_ble_evt_handler_set(ble_evt_dispatch);
APP_ERROR_CHECK(err_code);
// Register with the SoftDevice handler module for BLE events.
err_code = softdevice_sys_evt_handler_set(sys_evt_dispatch);
APP_ERROR_CHECK(err_code);
}Above is the ble related settings.
Update：
Bwloe is the capture of the connection process
