Diff: hw/nRF51822n/nRF51GattServer.cpp

Revision:

17:d5600677d532

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/hw/nRF51822n/nRF51GattServer.cpp	Fri Feb 21 09:33:31 2014 +0000
@@ -0,0 +1,231 @@
+/* mbed Microcontroller Library
+ * Copyright (c) 2006-2013 ARM Limited
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+  
+#include "nRF51GattServer.h"
+#include "mbed.h"
+
+#include "common/common.h"
+#include "btle/custom/custom_helper.h"
+
+/**************************************************************************/
+/*!
+    @brief  Adds a new service to the GATT table on the peripheral
+            
+    @returns    ble_error_t
+    
+    @retval     BLE_ERROR_NONE
+                Everything executed properly
+                
+    @section EXAMPLE
+
+    @code
+
+    @endcode
+*/
+/**************************************************************************/
+ble_error_t nRF51GattServer::addService(GattService & service)
+{
+    /* ToDo: Make sure we don't overflow the array, etc. */
+    /* ToDo: Make sure this service UUID doesn't already exist (?) */
+    /* ToDo: Basic validation */
+    
+    /* Add the service to the nRF51 */
+    ble_uuid_t uuid;
+
+    if (service.primaryServiceID.type == UUID::UUID_TYPE_SHORT)
+    {
+      /* 16-bit BLE UUID */
+      uuid.type = BLE_UUID_TYPE_BLE;
+    }
+    else
+    {
+      /* 128-bit Custom UUID */
+      uuid.type = custom_add_uuid_base( service.primaryServiceID.base );
+    }
+
+    uuid.uuid = service.primaryServiceID.value;
+
+    ASSERT( ERROR_NONE == sd_ble_gatts_service_add(BLE_GATTS_SRVC_TYPE_PRIMARY, &uuid, &service.handle), BLE_ERROR_PARAM_OUT_OF_RANGE );
+
+    /* Add characteristics to the service */
+    for (uint8_t i = 0; i < service.characteristicCount; i++)
+    {
+      GattCharacteristic * p_char = service.characteristics[i];
+
+      uuid.uuid = p_char->uuid;
+      ASSERT ( ERROR_NONE == custom_add_in_characteristic(service.handle, &uuid, p_char->properties,
+                                                          NULL, p_char->lenMin, p_char->lenMax, &nrfCharacteristicHandles[characteristicCount]), BLE_ERROR_PARAM_OUT_OF_RANGE );
+        
+      /* Update the characteristic handle */
+      p_char->handle = characteristicCount;
+      p_characteristics[characteristicCount++] = p_char;
+    }
+
+    serviceCount++;
+    
+    return BLE_ERROR_NONE;
+}
+
+/**************************************************************************/
+/*!
+    @brief  Reads the value of a characteristic, based on the service
+            and characteristic index fields
+
+    @param[in]  charHandle
+                The handle of the GattCharacteristic to read from
+    @param[in]  buffer
+                Buffer to hold the the characteristic's value
+                (raw byte array in LSB format)
+    @param[in]  len
+                The number of bytes read into the buffer
+            
+    @returns    ble_error_t
+    
+    @retval     BLE_ERROR_NONE
+                Everything executed properly
+                
+    @section EXAMPLE
+
+    @code
+
+    @endcode
+*/
+/**************************************************************************/
+ble_error_t nRF51GattServer::readValue(uint16_t charHandle, uint8_t buffer[], uint16_t len)
+{
+    ASSERT( ERROR_NONE == sd_ble_gatts_value_get(nrfCharacteristicHandles[charHandle].value_handle, 0, &len, buffer), BLE_ERROR_PARAM_OUT_OF_RANGE);
+    
+    return BLE_ERROR_NONE;
+}
+
+/**************************************************************************/
+/*!
+    @brief  Updates the value of a characteristic, based on the service
+            and characteristic index fields
+
+    @param[in]  charHandle
+                The handle of the GattCharacteristic to write to
+    @param[in]  buffer
+                Data to use when updating the characteristic's value
+                (raw byte array in LSB format)
+    @param[in]  len
+                The number of bytes in buffer
+            
+    @returns    ble_error_t
+    
+    @retval     BLE_ERROR_NONE
+                Everything executed properly
+                
+    @section EXAMPLE
+
+    @code
+
+    @endcode
+*/
+/**************************************************************************/
+ble_error_t nRF51GattServer::updateValue(uint16_t charHandle, uint8_t buffer[], uint16_t len)
+{
+  if ((p_characteristics[charHandle]->properties & (GattCharacteristic::BLE_GATT_CHAR_PROPERTIES_INDICATE | GattCharacteristic::BLE_GATT_CHAR_PROPERTIES_NOTIFY)) &&
+      (m_connectionHandle != BLE_CONN_HANDLE_INVALID) )
+  {
+    /* HVX update for the characteristic value */
+    ble_gatts_hvx_params_t hvx_params;
+
+    hvx_params.handle = nrfCharacteristicHandles[charHandle].value_handle;
+    hvx_params.type   = (p_characteristics[charHandle]->properties & GattCharacteristic::BLE_GATT_CHAR_PROPERTIES_NOTIFY)  ? BLE_GATT_HVX_NOTIFICATION : BLE_GATT_HVX_INDICATION;
+    hvx_params.offset = 0;
+    hvx_params.p_data = buffer;
+    hvx_params.p_len  = &len;
+
+    error_t error = (error_t) sd_ble_gatts_hvx(m_connectionHandle, &hvx_params);
+
+    /* ERROR_INVALID_STATE, ERROR_BUSY, ERROR_GATTS_SYS_ATTR_MISSING and ERROR_NO_TX_BUFFERS the ATT table has been updated. */
+    if ( (error != ERROR_NONE                      ) && (error != ERROR_INVALID_STATE) &&
+         (error != ERROR_BLE_NO_TX_BUFFERS         ) && (error != ERROR_BUSY         ) &&
+         (error != ERROR_BLEGATTS_SYS_ATTR_MISSING ) )
+    {
+      ASSERT_INT( ERROR_NONE, sd_ble_gatts_value_set(nrfCharacteristicHandles[charHandle].value_handle, 0, &len, buffer), BLE_ERROR_PARAM_OUT_OF_RANGE );
+    }
+  } else
+  {
+    ASSERT_INT( ERROR_NONE, sd_ble_gatts_value_set(nrfCharacteristicHandles[charHandle].value_handle, 0, &len, buffer), BLE_ERROR_PARAM_OUT_OF_RANGE );
+  }
+    
+  return BLE_ERROR_NONE;
+}
+
+/**************************************************************************/
+/*!
+    @brief  Callback handler for events getting pushed up from the SD
+*/
+/**************************************************************************/
+void nRF51GattServer::hwCallback(ble_evt_t * p_ble_evt)
+{
+  uint16_t handle_value;
+  GattServerEvents::gattEvent_t event;
+
+  switch (p_ble_evt->header.evt_id)
+  {
+    case BLE_GATTS_EVT_WRITE:
+      /* There are 2 use case here: Values being updated & CCCD (indicate/notify) enabled */
+      
+      /* 1.) Handle CCCD changes */
+      handle_value = p_ble_evt->evt.gatts_evt.params.write.handle;
+      for(uint8_t i=0; i<characteristicCount; i++)
+      {
+        if ( (p_characteristics[i]->properties & (GattCharacteristic::BLE_GATT_CHAR_PROPERTIES_INDICATE | GattCharacteristic::BLE_GATT_CHAR_PROPERTIES_NOTIFY)) &&
+             (nrfCharacteristicHandles[i].cccd_handle == handle_value) )
+        {
+          uint16_t cccd_value = (p_ble_evt->evt.gatts_evt.params.write.data[1] << 8) | p_ble_evt->evt.gatts_evt.params.write.data[0]; /* Little Endian but M0 may be mis-aligned */
+
+          if ( ((p_characteristics[i]->properties & GattCharacteristic::BLE_GATT_CHAR_PROPERTIES_INDICATE) && (cccd_value & BLE_GATT_HVX_INDICATION  )) ||
+               ((p_characteristics[i]->properties & GattCharacteristic::BLE_GATT_CHAR_PROPERTIES_NOTIFY  ) && (cccd_value & BLE_GATT_HVX_NOTIFICATION)))
+          {
+            event = GattServerEvents::GATT_EVENT_UPDATES_ENABLED;
+          } else
+          {
+            event = GattServerEvents::GATT_EVENT_UPDATES_DISABLED;
+          }
+
+          handleEvent(event, i);
+          return;
+        }
+      }
+
+      /* 2.) Changes to the characteristic value will be handled with other events below */
+      event = GattServerEvents::GATT_EVENT_DATA_WRITTEN;
+      break;
+
+    case BLE_GATTS_EVT_HVC:
+      /* Indication confirmation received */
+      event        = GattServerEvents::GATT_EVENT_CONFIRMATION_RECEIVED;
+      handle_value = p_ble_evt->evt.gatts_evt.params.hvc.handle;
+      break;
+
+    default: 
+      return;
+  }
+
+  /* Find index (charHandle) in the pool */
+  for(uint8_t i=0; i<characteristicCount; i++)
+  {
+    if (nrfCharacteristicHandles[i].value_handle == handle_value)
+    {
+      handleEvent(event, i);
+      break;
+    }
+  }
+}