hello everyone the softdevice used in my system are s110_nrf51822_7.1.0 and s120_nrf51822_1.0.1 the connect interval i set is 40ms.
my system refers the ble_app_hrs(s110) and ble_app_hrs_c(s120) example project. in the example ,data was sent by notification ,but in my project ,I want to use indication to send ecg data,for avoiding data missing during the transmition. So i replace the notification settings with indication as followed. in the ble_app_hrs_c(s120) ,I just change the cccd_configure function set cccd_val = enable ? BLE_GATT_HVX_NOTIFICATION : 0;
static uint32_t cccd_configure(uint16_t conn_handle, uint16_t handle_cccd, bool enable)
{
LOG("[HRS_C]: Configuring CCCD. CCCD Handle = %d, Connection Handle = %d\r\n", handle_cccd,conn_handle);
tx_message_t * p_msg;
uint16_t cccd_val = enable ? BLE_GATT_HVX_INDICATION : 0;
p_msg = &m_tx_buffer[m_tx_insert_index++];
m_tx_insert_index &= TX_BUFFER_MASK;
p_msg->req.write_req.gattc_params.handle = handle_cccd;
p_msg->req.write_req.gattc_params.len = WRITE_MESSAGE_LENGTH;
p_msg->req.write_req.gattc_params.p_value = p_msg->req.write_req.gattc_value;
p_msg->req.write_req.gattc_params.offset = 0;
p_msg->req.write_req.gattc_params.write_op = BLE_GATT_OP_WRITE_REQ;
p_msg->req.write_req.gattc_value[0] = LSB(cccd_val);
p_msg->req.write_req.gattc_value[1] = MSB(cccd_val);
p_msg->conn_handle = conn_handle;
p_msg->type = WRITE_REQ;
tx_buffer_process();
return NRF_SUCCESS;
}
in the ble_app_hrs(s110) project i set char_md.char_props.indicate = 1 ,and in the ble_hrs_heart_rate_measurement_send fuction i set hvx_params.type = BLE_GATT_HVX_indication; the code was here:
memset(&cccd_md, 0, sizeof(cccd_md));
BLE_GAP_CONN_SEC_MODE_SET_OPEN(&cccd_md.read_perm);
cccd_md.write_perm = p_hrs_init->hrs_hrm_attr_md.cccd_write_perm;
cccd_md.vloc = BLE_GATTS_VLOC_STACK;
memset(&char_md, 0, sizeof(char_md));
char_md.char_props.indicate = 1;
char_md.p_char_user_desc = NULL;
char_md.p_char_pf = NULL;
char_md.p_user_desc_md = NULL;
char_md.p_cccd_md = &cccd_md;
char_md.p_sccd_md = NULL;
BLE_UUID_BLE_ASSIGN(ble_uuid, BLE_UUID_HEART_RATE_MEASUREMENT_CHAR);
a
uint32_t ble_hrs_heart_rate_measurement_send(ble_hrs_t * p_hrs, uint8_t * ECG_data)
{
uint32_t err_code;
// Send value if connected and notifying
if (p_hrs->conn_handle != BLE_CONN_HANDLE_INVALID)
{
uint8_t * encoded_hrm;
//uint16_t len;
uint16_t hvx_len;
ble_gatts_hvx_params_t hvx_params;
//uint8_t encoded_hrm1[MAX_HRM_LEN];
//len = hrm_encode(p_hrs, heart_rate, encoded_hrm1);
hvx_len = MAX_HRM_LEN;
encoded_hrm=ECG_data;
//encoded_hrm[1]=(uint8_t)len;
memset(&hvx_params, 0, sizeof(hvx_params));
hvx_params.handle = p_hrs->hrm_handles.value_handle;
hvx_params.type = BLE_GATT_HVX_NOTIFICATION;
hvx_params.offset = 0;
hvx_params.p_len = &hvx_len;
hvx_params.p_data = encoded_hrm;
err_code = sd_ble_gatts_hvx(p_hrs->conn_handle, &hvx_params);
}
else
{
err_code = NRF_ERROR_INVALID_STATE;
}
return err_code;
}
the problem is when i use the central device enable the indication of hrm ,the ble_app_hrs(s110) device would disconnect and break down,even i couldn't do a system_reset by an external key interruput .But when i change the indication settings with notification ,the system works on succesfully. Does somebody come up with the same problem or konw the reason causing this? thank u very much.
