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mbed-os/libraries/ble/nRF51822/nRF51GattServer.cpp

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/* 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"
#include "nRF51Gap.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, bool localOnly)
{
uint16_t gapConnectionHandle = nRF51Gap::getInstance().getConnectionHandle();
if (localOnly)
{
/* Only update locally regardless of notify/indicate */
ASSERT_INT( ERROR_NONE, sd_ble_gatts_value_set(nrfCharacteristicHandles[charHandle].value_handle, 0, &len, buffer), BLE_ERROR_PARAM_OUT_OF_RANGE );
}
if ((p_characteristics[charHandle]->properties & (GattCharacteristic::BLE_GATT_CHAR_PROPERTIES_INDICATE | GattCharacteristic::BLE_GATT_CHAR_PROPERTIES_NOTIFY)) &&
(gapConnectionHandle != 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(gapConnectionHandle, &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;
}
}
}
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