Hello,
nRF5SDk16.0, Softdevice v.7.0.1, device nRF52840.
We using manufacturer specific information in the advertisement data. Here are the set values:
#define APP_ADV_INTERVAL 100 //62.5ms #define APP_ADV_DURATION 0 //always advertise
The data is update through following code:
void send_adv_data(){
ret_code_t err_code;
ble_advertising_init_t init;
uint8_t data_packet[5] = {0};
// Get latest time
rtc_get_time_local();
// Copy data into data_packet
for (int i=0; i<sizeof(4); i++)
data_packet[i] = local_time[i];
// Copy time stamp (+1) to last byte
data_packet[4] = t_stamp;
memset(&init, 0, sizeof(init));
advdata.name_type = BLE_ADVDATA_FULL_NAME;
advdata.include_appearance = true;
advdata.flags = BLE_GAP_ADV_FLAGS_LE_ONLY_GENERAL_DISC_MODE;
clock_data.data.p_data = &data_packet;
clock_data.data.size = sizeof(data_packet);
advdata.p_manuf_specific_data = &clock_data;
err_code = ble_advertising_advdata_update(&m_advertising, &advdata, NULL);
APP_ERROR_CHECK(err_code);
}
The send_adv_data() function above is being called by an APP_TIMER with an interval of 50ms.
ISSUE:
We are receiving this advertisement data on an iPhone application. The problem is that when we power cycle the nRF52840 custom board, the received adv packets are sometimes more than 1 second apart. While we need these packets on a quick succession like after every 62.5ms. If the iPhone device is out-of-range and comes back into the range of nRF device, we can capture these packets quickly. But at the start of power cycle, we cannot get reliable packets for several minutes.
So my question is why can't the nRF device send reliable packets at the start of power cycle? What is the priority of advertisement over other tasks? Does the startup cycle have any affect of advertisement at all?
The initialization code in my main.c file takes less than 500ms to complete.
Here is initialization code:
int main(void)
{
bool erase_bonds;
char * name_ptr;
bool test_drives_result;
int i=0;
// Initialize.
log_init();
timers_init();
read_module_type();
//buttons_leds_init(&erase_bonds);
NRF_LOG_INFO("Initializing RTC timer...");
rtc_init();
power_management_init();
ble_stack_init();
// Conventional passkey call here if required
// TODO
// Get device mac address and config its name accordingly
get_device_mac_address();
device_name_app = get_device_name(device_mac_address);
gap_params_init();
gatt_init();
// Initialize flash memory &
// Get values from Flash memory, Hotshot operation
fdsm_init();
services_init();
advertising_init();
conn_params_init();
peer_manager_init();
// Start execution.
NRF_LOG_INFO("\r\n\r\n\r\nHotshot Firing System started...");
NRF_LOG_INFO("Initializing adv timer...");
adv_timer_init();
adv_timer_start();
NRF_LOG_INFO("Initializing script timer...");
scr_timer_init();
// Hotshot operations initialize (except fds_init())
NRF_LOG_INFO("Initializing ADC...");
saadc_init();
saadc_sampling_event_init();
saadc_sampling_event_enable();
NRF_LOG_INFO("Initializing cue outputs...");
cue_outputs_init();
NRF_LOG_INFO("Initializing address (RGB colors)...");
rgb_outputs_init();
NRF_LOG_INFO("Initializing script data...");
scr_data_init();
NRF_LOG_INFO("Initializing scan delay timer...");
s_delay_timer_init();
if (modType == MOD_TYPE_BT840XE) {
#ifdef APP_PA_LAN
nrf_gpio_cfg_output(APP_CPS_PIN);
nrf_gpio_cfg_output(APP_CHL_PIN);
nrf_gpio_pin_set(APP_CHL_PIN);
nrf_gpio_pin_clear(APP_CPS_PIN); //enable
pa_lna_init(APP_PA_PIN,APP_LNA_PIN);
#endif
}
// Get the time stamp
record_read_data(&t_stamp);
t_stamp++;
if (t_stamp>255)
t_stamp=0;
record_update_data(t_stamp);
NRF_LOG_INFO("Time stamp value to adv: %d", t_stamp);
//nrf_delay_ms(100);
NRF_LOG_INFO("Initializing app timers...");
application_timers_start();
advertising_start(erase_bonds);
// Extract password key from MAC address
NRF_LOG_INFO("Setting passkey...");
set_passkey();
// Run RGB sequence
#ifdef RGB_INDICATOR
rgb_sequence();
#endif
NRF_LOG_INFO("Running cue drive voltage tests...");
// Perform the self test
test_drives_result = test_drives();
if (test_drives_result){
NRF_LOG_INFO("Drive voltage tests passed.");
}
else{
NRF_LOG_INFO("Drive voltage tests failed.");
}
#ifdef RGB_INDICATOR
rgb_self_test_indicator(test_drives_result);
#endif
// Get drive battery (18V) voltage
drive_battery_voltage = get_drive_voltage();
NRF_LOG_INFO("Device name = %s", device_name_app);
NRF_LOG_INFO("Device total cues = %d", dev_total_cues);
NRF_LOG_INFO("Device Hardware version = %d.%d", HARDWARE_VERSION/10, HARDWARE_VERSION%10);
NRF_LOG_INFO("Device Firmware version = %d.%d", FIRMWARE_VERSION/10, FIRMWARE_VERSION%10);
// Initialize log data, read log data from flash
#ifdef INTERNAL_LOG_ENABLED
init_log_data();
#endif
// Extract password key from MAC address
NRF_LOG_INFO("Running main loop...");
// Enter main loop.
for (;;)
{
idle_state_handle();
}
}
