/**@brief Handle received ANT data message.
*
* @param[in] p_evt_buffer The buffer containing received data.
*/
static void ant_data_messages_handle(uint8_t * p_evt_buffer)
{
static uint32_t s_previous_beat_count = 0; // Heart beat count from previously received page
uint32_t err_code;
uint32_t current_page;
uint8_t beat_count;
uint8_t computed_heart_rate;
uint16_t beat_time;
// Decode the default page data present in all pages
beat_time = uint16_decode(&p_evt_buffer[ANT_BUFFER_INDEX_MESG_DATA + 4]);
beat_count = (uint8_t)p_evt_buffer[ANT_BUFFER_INDEX_MESG_DATA + 6];
computed_heart_rate = (uint8_t)p_evt_buffer[ANT_BUFFER_INDEX_MESG_DATA + 7];
// Decode page specific data
current_page = p_evt_buffer[ANT_BUFFER_INDEX_MESG_DATA];
switch (current_page & ~ANT_HRM_TOGGLE_MASK)
{
case ANT_HRM_PAGE_4:
// Ensure that there is only one beat between time intervals.
if ((beat_count - s_previous_beat_count) == 1)
{
uint16_t prev_beat = uint16_decode(&p_evt_buffer[ANT_BUFFER_INDEX_MESG_DATA + 2]);
// Subtracting the event time gives the R-R interval
ble_hrs_rr_interval_add(&m_hrs, beat_time - prev_beat);
}
s_previous_beat_count = beat_count;
break;
case ANT_HRM_PAGE_0:
case ANT_HRM_PAGE_1:
case ANT_HRM_PAGE_2:
case ANT_HRM_PAGE_3:
default:
// No implementation needed.
break;
}
// Notify the received heart rate measurement
err_code = ble_hrs_heart_rate_measurement_send(&m_hrs, computed_heart_rate);
if (
(err_code != NRF_SUCCESS)
&&
(err_code != NRF_ERROR_INVALID_STATE)
&&
(err_code != BLE_ERROR_NO_TX_BUFFERS)
&&
(err_code != BLE_ERROR_GATTS_SYS_ATTR_MISSING)
)
{
APP_ERROR_HANDLER(err_code);
}
}
/**@brief Function for handling the RR interval timer timeout.
*
* @details This function will be called each time the RR interval timer expires.
*
* @param[in] p_context Pointer used for passing some arbitrary information (context) from the
* app_start_timer() call to the timeout handler.
*/
static void rr_interval_timeout_handler(void * p_context)
{
UNUSED_PARAMETER(p_context);
if (m_rr_interval_enabled)
{
uint16_t rr_interval;
rr_interval = (uint16_t)sensorsim_measure(&m_rr_interval_sim_state,
&m_rr_interval_sim_cfg);
ble_hrs_rr_interval_add(&m_hrs, rr_interval);
rr_interval = (uint16_t)sensorsim_measure(&m_rr_interval_sim_state,
&m_rr_interval_sim_cfg);
ble_hrs_rr_interval_add(&m_hrs, rr_interval);
rr_interval = (uint16_t)sensorsim_measure(&m_rr_interval_sim_state,
&m_rr_interval_sim_cfg);
ble_hrs_rr_interval_add(&m_hrs, rr_interval);
rr_interval = (uint16_t)sensorsim_measure(&m_rr_interval_sim_state,
&m_rr_interval_sim_cfg);
ble_hrs_rr_interval_add(&m_hrs, rr_interval);
rr_interval = (uint16_t)sensorsim_measure(&m_rr_interval_sim_state,
&m_rr_interval_sim_cfg);
ble_hrs_rr_interval_add(&m_hrs, rr_interval);
rr_interval = (uint16_t)sensorsim_measure(&m_rr_interval_sim_state,
&m_rr_interval_sim_cfg);
ble_hrs_rr_interval_add(&m_hrs, rr_interval);
}
}
