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- #include "sdk_common.h"
- #if NRF_MODULE_ENABLED(BLE_BPS)
- #include "ble_bps.h"
- #include "ble_err.h"
- #include <string.h>
- #include "nordic_common.h"
- #include "ble_srv_common.h"
- #define OPCODE_LENGTH 1
- #define HANDLE_LENGTH 2
- #define MAX_BPM_LEN (BLE_GATT_ATT_MTU_DEFAULT - OPCODE_LENGTH - HANDLE_LENGTH)
- #define BPS_MEAS_BLOOD_PRESSURE_UNITS_FLAG_BIT (0x01 << 0)
- #define BPS_MEAS_TIME_STAMP_FLAG_BIT (0x01 << 1)
- #define BPS_MEAS_PULSE_RATE_FLAG_BIT (0x01 << 2)
- #define BPS_MEAS_USER_ID_FLAG_BIT (0x01 << 3)
- #define BPS_MEAS_MEASUREMENT_STATUS_FLAG_BIT (0x01 << 4)
- static void gatt_error_handler(uint32_t nrf_error,
- void * p_ctx,
- uint16_t conn_handle)
- {
- ble_bps_t * p_bps = (ble_bps_t *)p_ctx;
- if (p_bps->error_handler != NULL)
- {
- p_bps->error_handler(nrf_error);
- }
- }
- static void on_connect(ble_bps_t * p_bps, ble_evt_t const * p_ble_evt)
- {
- ret_code_t err_code;
- p_bps->conn_handle = p_ble_evt->evt.gap_evt.conn_handle;
- err_code = nrf_ble_gq_conn_handle_register(p_bps->p_gatt_queue,
- p_ble_evt->evt.gap_evt.conn_handle);
- if ((p_bps->error_handler != NULL) &&
- (err_code != NRF_SUCCESS))
- {
- p_bps->error_handler(err_code);
- }
- }
- static void on_disconnect(ble_bps_t * p_bps, ble_evt_t const * p_ble_evt)
- {
- UNUSED_PARAMETER(p_ble_evt);
- p_bps->conn_handle = BLE_CONN_HANDLE_INVALID;
- }
- static void on_cccd_write(ble_bps_t * p_bps, ble_gatts_evt_write_t const * p_evt_write)
- {
- if (p_evt_write->len == 2)
- {
-
- if (p_bps->evt_handler != NULL)
- {
- ble_bps_evt_t evt;
- if (ble_srv_is_indication_enabled(p_evt_write->data))
- {
- evt.evt_type = BLE_BPS_EVT_INDICATION_ENABLED;
- }
- else
- {
- evt.evt_type = BLE_BPS_EVT_INDICATION_DISABLED;
- }
- p_bps->evt_handler(p_bps, &evt);
- }
- }
- }
- static void on_write(ble_bps_t * p_bps, ble_evt_t const * p_ble_evt)
- {
- ble_gatts_evt_write_t const * p_evt_write = &p_ble_evt->evt.gatts_evt.params.write;
- if (p_evt_write->handle == p_bps->meas_handles.cccd_handle)
- {
- on_cccd_write(p_bps, p_evt_write);
- }
- }
- static void on_hvc(ble_bps_t * p_bps, ble_evt_t const * p_ble_evt)
- {
- ble_gatts_evt_hvc_t const * p_hvc = &p_ble_evt->evt.gatts_evt.params.hvc;
- if (p_hvc->handle == p_bps->meas_handles.value_handle)
- {
- ble_bps_evt_t evt;
- evt.evt_type = BLE_BPS_EVT_INDICATION_CONFIRMED;
- p_bps->evt_handler(p_bps, &evt);
- }
- }
- void ble_bps_on_ble_evt(ble_evt_t const * p_ble_evt, void * p_context)
- {
- ble_bps_t * p_bps = (ble_bps_t *)p_context;
- switch (p_ble_evt->header.evt_id)
- {
- case BLE_GAP_EVT_CONNECTED:
- on_connect(p_bps, p_ble_evt);
- break;
- case BLE_GAP_EVT_DISCONNECTED:
- on_disconnect(p_bps, p_ble_evt);
- break;
- case BLE_GATTS_EVT_WRITE:
- on_write(p_bps, p_ble_evt);
- break;
- case BLE_GATTS_EVT_HVC:
- on_hvc(p_bps, p_ble_evt);
- break;
- default:
-
- break;
- }
- }
- static uint8_t bps_measurement_encode(ble_bps_t * p_bps,
- ble_bps_meas_t * p_bps_meas,
- uint8_t * p_encoded_buffer)
- {
- uint8_t flags = 0;
- uint8_t len = 1;
- uint16_t encoded_sfloat;
-
- if (p_bps_meas->blood_pressure_units_in_kpa)
- {
- flags |= BPS_MEAS_BLOOD_PRESSURE_UNITS_FLAG_BIT;
- }
-
- encoded_sfloat = ((p_bps_meas->blood_pressure_systolic.exponent << 12) & 0xF000) |
- ((p_bps_meas->blood_pressure_systolic.mantissa << 0) & 0x0FFF);
- len += uint16_encode(encoded_sfloat, &p_encoded_buffer[len]);
-
- encoded_sfloat = ((p_bps_meas->blood_pressure_diastolic.exponent << 12) & 0xF000) |
- ((p_bps_meas->blood_pressure_diastolic.mantissa << 0) & 0x0FFF);
- len += uint16_encode(encoded_sfloat, &p_encoded_buffer[len]);
-
- encoded_sfloat = ((p_bps_meas->mean_arterial_pressure.exponent << 12) & 0xF000) |
- ((p_bps_meas->mean_arterial_pressure.mantissa << 0) & 0x0FFF);
- len += uint16_encode(encoded_sfloat, &p_encoded_buffer[len]);
-
- if (p_bps_meas->time_stamp_present)
- {
- flags |= BPS_MEAS_TIME_STAMP_FLAG_BIT;
- len += ble_date_time_encode(&p_bps_meas->time_stamp, &p_encoded_buffer[len]);
- }
-
- if (p_bps_meas->pulse_rate_present)
- {
- flags |= BPS_MEAS_PULSE_RATE_FLAG_BIT;
- encoded_sfloat = ((p_bps_meas->pulse_rate.exponent << 12) & 0xF000) |
- ((p_bps_meas->pulse_rate.mantissa << 0) & 0x0FFF);
- len += uint16_encode(encoded_sfloat, &p_encoded_buffer[len]);
- }
-
- if (p_bps_meas->user_id_present)
- {
- flags |= BPS_MEAS_USER_ID_FLAG_BIT;
- p_encoded_buffer[len++] = p_bps_meas->user_id;
- }
-
- if (p_bps_meas->measurement_status_present)
- {
- flags |= BPS_MEAS_MEASUREMENT_STATUS_FLAG_BIT;
- len += uint16_encode(p_bps_meas->measurement_status, &p_encoded_buffer[len]);
- }
-
- p_encoded_buffer[0] = flags;
- return len;
- }
- uint32_t ble_bps_init(ble_bps_t * p_bps, ble_bps_init_t const * p_bps_init)
- {
- VERIFY_PARAM_NOT_NULL(p_bps);
- VERIFY_PARAM_NOT_NULL(p_bps_init);
- VERIFY_PARAM_NOT_NULL(p_bps_init->p_gatt_queue);
- uint32_t err_code;
- uint8_t init_value_encoded[MAX_BPM_LEN];
- uint8_t initial_feature_len;
- ble_bps_meas_t initial_bpm;
- ble_uuid_t ble_uuid;
- ble_add_char_params_t add_char_params;
-
- p_bps->evt_handler = p_bps_init->evt_handler;
- p_bps->error_handler = p_bps_init->error_handler;
- p_bps->p_gatt_queue = p_bps_init->p_gatt_queue;
- p_bps->conn_handle = BLE_CONN_HANDLE_INVALID;
- p_bps->feature = p_bps_init->feature;
-
- BLE_UUID_BLE_ASSIGN(ble_uuid, BLE_UUID_BLOOD_PRESSURE_SERVICE);
- err_code = sd_ble_gatts_service_add(BLE_GATTS_SRVC_TYPE_PRIMARY, &ble_uuid, &p_bps->service_handle);
- if (err_code != NRF_SUCCESS)
- {
- return err_code;
- }
-
- memset(&initial_bpm, 0, sizeof(initial_bpm));
- memset(&add_char_params, 0, sizeof(add_char_params));
- add_char_params.uuid = BLE_UUID_BLOOD_PRESSURE_MEASUREMENT_CHAR;
- add_char_params.max_len = MAX_BPM_LEN;
- add_char_params.is_var_len = true;
- add_char_params.init_len = bps_measurement_encode(p_bps, &initial_bpm, init_value_encoded);
- add_char_params.p_init_value = init_value_encoded;
- add_char_params.char_props.indicate = 1;
- add_char_params.cccd_write_access = p_bps_init->bp_cccd_wr_sec;
- err_code = characteristic_add(p_bps->service_handle, &add_char_params, &p_bps->meas_handles);
- if (err_code != NRF_SUCCESS)
- {
- return err_code;
- }
-
- initial_feature_len = uint16_encode(p_bps_init->feature, init_value_encoded);
- memset(&add_char_params, 0, sizeof(add_char_params));
- add_char_params.uuid = BLE_UUID_BLOOD_PRESSURE_FEATURE_CHAR;
- add_char_params.max_len = initial_feature_len;
- add_char_params.init_len = initial_feature_len;
- add_char_params.p_init_value = init_value_encoded;
- add_char_params.char_props.read = 1;
- add_char_params.read_access = p_bps_init->bp_feature_rd_sec;
- err_code = characteristic_add(p_bps->service_handle, &add_char_params, &p_bps->feature_handles);
- if (err_code != NRF_SUCCESS)
- {
- return err_code;
- }
- return NRF_SUCCESS;
- }
- uint32_t ble_bps_measurement_send(ble_bps_t * p_bps, ble_bps_meas_t * p_bps_meas)
- {
- uint32_t err_code;
-
- if (p_bps->conn_handle != BLE_CONN_HANDLE_INVALID)
- {
- uint8_t encoded_bps_meas[MAX_BPM_LEN];
- uint16_t len;
- nrf_ble_gq_req_t bps_req;
- len = bps_measurement_encode(p_bps, p_bps_meas, encoded_bps_meas);
- memset(&bps_req, 0, sizeof(nrf_ble_gq_req_t));
- bps_req.type = NRF_BLE_GQ_REQ_GATTS_HVX;
- bps_req.error_handler.cb = gatt_error_handler;
- bps_req.error_handler.p_ctx = p_bps;
- bps_req.params.gatts_hvx.handle = p_bps->meas_handles.value_handle;
- bps_req.params.gatts_hvx.offset = 0;
- bps_req.params.gatts_hvx.p_data = encoded_bps_meas;
- bps_req.params.gatts_hvx.p_len = &len;
- bps_req.params.gatts_hvx.type = BLE_GATT_HVX_INDICATION;
- err_code = nrf_ble_gq_item_add(p_bps->p_gatt_queue, &bps_req, p_bps->conn_handle);
- }
- else
- {
- err_code = NRF_ERROR_INVALID_STATE;
- }
- return err_code;
- }
- uint32_t ble_bps_is_indication_enabled(ble_bps_t * p_bps, bool * p_indication_enabled)
- {
- uint32_t err_code;
- uint8_t cccd_value_buf[BLE_CCCD_VALUE_LEN];
- ble_gatts_value_t gatts_value;
-
- memset(&gatts_value, 0, sizeof(gatts_value));
- gatts_value.len = BLE_CCCD_VALUE_LEN;
- gatts_value.offset = 0;
- gatts_value.p_value = cccd_value_buf;
- err_code = sd_ble_gatts_value_get(p_bps->conn_handle,
- p_bps->meas_handles.cccd_handle,
- &gatts_value);
- if (err_code == NRF_SUCCESS)
- {
- *p_indication_enabled = ble_srv_is_indication_enabled(cccd_value_buf);
- }
- if (err_code == BLE_ERROR_GATTS_SYS_ATTR_MISSING)
- {
- *p_indication_enabled = false;
- return NRF_SUCCESS;
- }
- return err_code;
- }
- #endif
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