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247 lines
11 KiB
247 lines
11 KiB
/* mbed Microcontroller Library
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* Copyright (c) 2006-2013 ARM Limited
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef __NRF5x_GAP_H__
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#define __NRF5x_GAP_H__
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#ifdef YOTTA_CFG_MBED_OS
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#include "mbed-drivers/mbed.h"
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#else
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#include "mbed.h"
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#endif
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#ifndef YOTTA_CFG_WHITELIST_MAX_SIZE
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#define YOTTA_CFG_WHITELIST_MAX_SIZE BLE_GAP_WHITELIST_ADDR_MAX_COUNT
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#elif YOTTA_CFG_WHITELIST_MAX_SIZE > BLE_GAP_WHITELIST_ADDR_MAX_COUNT
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#undef YOTTA_CFG_WHITELIST_MAX_SIZE
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#define YOTTA_CFG_WHITELIST_MAX_SIZE BLE_GAP_WHITELIST_ADDR_MAX_COUNT
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#endif
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#ifndef YOTTA_CFG_IRK_TABLE_MAX_SIZE
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#define YOTTA_CFG_IRK_TABLE_MAX_SIZE BLE_GAP_WHITELIST_IRK_MAX_COUNT
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#elif YOTTA_CFG_IRK_TABLE_MAX_SIZE > BLE_GAP_WHITELIST_IRK_MAX_COUNT
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#undef YOTTA_CFG_IRK_TABLE_MAX_SIZE
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#define YOTTA_CFG_IRK_TABLE_MAX_SIZE BLE_GAP_WHITELIST_IRK_MAX_COUNT
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#endif
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#include "ble/blecommon.h"
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#include "ble.h"
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#include "ble/GapAdvertisingParams.h"
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#include "ble/GapAdvertisingData.h"
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#include "ble/Gap.h"
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#include "ble/GapScanningParams.h"
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#include "nrf_soc.h"
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extern "C" {
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#include "ble_radio_notification.h"
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}
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#include "btle_security.h"
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void radioNotificationStaticCallback(bool param);
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/**************************************************************************/
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/*!
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\brief
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*/
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/**************************************************************************/
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class nRF5xGap : public Gap
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{
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public:
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/* Functions that must be implemented from Gap */
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virtual ble_error_t setAddress(AddressType_t type, const Address_t address);
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virtual ble_error_t getAddress(AddressType_t *typeP, Address_t address);
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virtual ble_error_t setAdvertisingData(const GapAdvertisingData &, const GapAdvertisingData &);
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virtual uint16_t getMinAdvertisingInterval(void) const {return GapAdvertisingParams::ADVERTISEMENT_DURATION_UNITS_TO_MS(BLE_GAP_ADV_INTERVAL_MIN);}
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virtual uint16_t getMinNonConnectableAdvertisingInterval(void) const {return GapAdvertisingParams::ADVERTISEMENT_DURATION_UNITS_TO_MS(BLE_GAP_ADV_NONCON_INTERVAL_MIN);}
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virtual uint16_t getMaxAdvertisingInterval(void) const {return GapAdvertisingParams::ADVERTISEMENT_DURATION_UNITS_TO_MS(BLE_GAP_ADV_INTERVAL_MAX);}
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virtual ble_error_t startAdvertising(const GapAdvertisingParams &);
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virtual ble_error_t stopAdvertising(void);
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virtual ble_error_t connect(const Address_t, BLEProtocol::AddressType_t peerAddrType, const ConnectionParams_t *connectionParams, const GapScanningParams *scanParams);
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virtual ble_error_t disconnect(Handle_t connectionHandle, DisconnectionReason_t reason);
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virtual ble_error_t disconnect(DisconnectionReason_t reason);
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virtual ble_error_t setDeviceName(const uint8_t *deviceName);
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virtual ble_error_t getDeviceName(uint8_t *deviceName, unsigned *lengthP);
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virtual ble_error_t setAppearance(GapAdvertisingData::Appearance appearance);
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virtual ble_error_t getAppearance(GapAdvertisingData::Appearance *appearanceP);
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virtual ble_error_t setTxPower(int8_t txPower);
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virtual void getPermittedTxPowerValues(const int8_t **valueArrayPP, size_t *countP);
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void setConnectionHandle(uint16_t con_handle);
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uint16_t getConnectionHandle(void);
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virtual ble_error_t getPreferredConnectionParams(ConnectionParams_t *params);
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virtual ble_error_t setPreferredConnectionParams(const ConnectionParams_t *params);
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virtual ble_error_t updateConnectionParams(Handle_t handle, const ConnectionParams_t *params);
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virtual ble_error_t reset(void);
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/*
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* The following functions are part of the whitelisting experimental API.
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* Therefore, this functionality can change in the near future.
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*/
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virtual uint8_t getMaxWhitelistSize(void) const;
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virtual ble_error_t getWhitelist(Gap::Whitelist_t &whitelistOut) const;
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virtual ble_error_t setWhitelist(const Gap::Whitelist_t &whitelistIn);
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virtual ble_error_t setAdvertisingPolicyMode(AdvertisingPolicyMode_t mode);
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virtual ble_error_t setScanningPolicyMode(ScanningPolicyMode_t mode);
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virtual ble_error_t setInitiatorPolicyMode(InitiatorPolicyMode_t mode);
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virtual Gap::AdvertisingPolicyMode_t getAdvertisingPolicyMode(void) const;
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virtual Gap::ScanningPolicyMode_t getScanningPolicyMode(void) const;
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virtual Gap::InitiatorPolicyMode_t getInitiatorPolicyMode(void) const;
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virtual ble_error_t initRadioNotification(void) {
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if (ble_radio_notification_init(NRF_APP_PRIORITY_HIGH, NRF_RADIO_NOTIFICATION_DISTANCE_800US, radioNotificationStaticCallback) == NRF_SUCCESS) {
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return BLE_ERROR_NONE;
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}
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return BLE_ERROR_UNSPECIFIED;
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}
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/* Observer role is not supported by S110, return BLE_ERROR_NOT_IMPLEMENTED */
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#if !defined(TARGET_MCU_NRF51_16K_S110) && !defined(TARGET_MCU_NRF51_32K_S110)
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virtual ble_error_t startRadioScan(const GapScanningParams &scanningParams);
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virtual ble_error_t stopScan(void);
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#endif
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private:
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/*
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* Whitelisting API related structures and helper functions.
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*/
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/* Policy modes set by the user. By default these are set to ignore the whitelist */
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Gap::AdvertisingPolicyMode_t advertisingPolicyMode;
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Gap::ScanningPolicyMode_t scanningPolicyMode;
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/* Internal representation of a whitelist */
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uint8_t whitelistAddressesSize;
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ble_gap_addr_t whitelistAddresses[YOTTA_CFG_WHITELIST_MAX_SIZE];
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/*
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* An internal function used to populate the ble_gap_whitelist_t that will be used by
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* the SoftDevice for filtering requests. This function is needed because for the BLE
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* API the whitelist is just a collection of keys, but for the stack it also includes
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* the IRK table.
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*/
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ble_error_t generateStackWhitelist(ble_gap_whitelist_t &whitelist);
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private:
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bool radioNotificationCallbackParam; /* parameter to be passed into the Timeout-generated radio notification callback. */
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Timeout radioNotificationTimeout;
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/*
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* A helper function to post radio notification callbacks with low interrupt priority.
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*/
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void postRadioNotificationCallback(void) {
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#ifdef YOTTA_CFG_MBED_OS
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/*
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* In mbed OS, all user-facing BLE events (interrupts) are posted to the
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* MINAR scheduler to be executed as callbacks in thread mode. MINAR guards
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* its critical sections from interrupts by acquiring CriticalSectionLock,
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* which results in a call to sd_nvic_critical_region_enter(). Thus, it is
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* safe to invoke MINAR APIs from interrupt context as long as those
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* interrupts are blocked by sd_nvic_critical_region_enter().
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*
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* Radio notifications are a special case for the above. The Radio
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* Notification IRQ is handled at a very high priority--higher than the
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* level blocked by sd_nvic_critical_region_enter(). Thus Radio Notification
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* events can preempt MINAR's critical sections. Using MINAR APIs (such as
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* posting an event) directly in processRadioNotification() may result in a
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* race condition ending in a hard-fault.
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*
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* The solution is to *not* call MINAR APIs directly from the Radio
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* Notification handling; i.e. to do the bulk of RadioNotification
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* processing at a reduced priority which respects MINAR's critical
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* sections. Unfortunately, on a cortex-M0, there is no clean way to demote
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* priority for the currently executing interrupt--we wouldn't want to
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* demote the radio notification handling anyway because it is sensitive to
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* timing, and the system expects to finish this handling very quickly. The
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* workaround is to employ a Timeout to trigger
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* postRadioNotificationCallback() after a very short delay (~0 us) and post
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* the MINAR callback that context.
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*
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* !!!WARNING!!! Radio notifications are very time critical events. The
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* current solution is expected to work under the assumption that
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* postRadioNotificationCalback() will be executed BEFORE the next radio
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* notification event is generated.
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*/
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minar::Scheduler::postCallback(
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mbed::util::FunctionPointer1<void, bool>(&radioNotificationCallback, &FunctionPointerWithContext<bool>::call).bind(radioNotificationCallbackParam)
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);
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#else
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/*
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* In mbed classic, all user-facing BLE events execute callbacks in interrupt
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* mode. Radio Notifications are a special case because its IRQ is handled at
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* a very high priority. Thus Radio Notification events can preempt other
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* operations that require interaction with the SoftDevice such as advertising
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* payload updates and changing the Gap state. Therefore, executing a Radio
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* Notification callback directly from processRadioNotification() may result
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* in a race condition ending in a hard-fault.
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*
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* The solution is to *not* execute the Radio Notification callback directly
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* from the Radio Notification handling; i.e. to do the bulk of the
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* Radio Notification processing at a reduced priority. Unfortunately, on a
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* cortex-M0, there is no clean way to demote priority for the currently
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* executing interrupt--we wouldn't want to demote the radio notification
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* handling anyway because it is sensitive to timing, and the system expects
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* to finish this handling very quickly. The workaround is to employ a Timeout
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* to trigger postRadioNotificationCallback() after a very short delay (~0 us)
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* and execute the callback in that context.
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*
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* !!!WARNING!!! Radio notifications are very time critical events. The
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* current solution is expected to work under the assumption that
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* postRadioNotificationCalback() will be executed BEFORE the next radio
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* notification event is generated.
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*/
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radioNotificationCallback.call(radioNotificationCallbackParam);
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#endif /* #ifdef YOTTA_CFG_MBED_OS */
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}
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/**
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* A helper function to process radio-notification events; to be called internally.
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* @param param [description]
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*/
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void processRadioNotificationEvent(bool param) {
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radioNotificationCallbackParam = param;
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radioNotificationTimeout.attach_us(this, &nRF5xGap::postRadioNotificationCallback, 0);
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}
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friend void radioNotificationStaticCallback(bool param); /* allow invocations of processRadioNotificationEvent() */
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private:
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uint16_t m_connectionHandle;
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/*
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* Allow instantiation from nRF5xn when required.
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*/
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friend class nRF5xn;
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nRF5xGap() :
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advertisingPolicyMode(Gap::ADV_POLICY_IGNORE_WHITELIST),
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scanningPolicyMode(Gap::SCAN_POLICY_IGNORE_WHITELIST),
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whitelistAddressesSize(0) {
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m_connectionHandle = BLE_CONN_HANDLE_INVALID;
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}
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nRF5xGap(nRF5xGap const &);
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void operator=(nRF5xGap const &);
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};
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#endif // ifndef __NRF5x_GAP_H__
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