116 lines
4.2 KiB
C
116 lines
4.2 KiB
C
// Copyright 2015-2016 Espressif Systems (Shanghai) PTE LTD
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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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// 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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*
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* Filename: btc_sm.h
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*
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* Description: Generic BTC state machine API
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*
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*****************************************************************************/
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#ifndef __BTC_SM_H__
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#define __BTC_SM_H__
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/*****************************************************************************
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** Constants & Macros
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******************************************************************************/
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/* Generic Enter/Exit state machine events */
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#define BTC_SM_ENTER_EVT 0xFFFF
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#define BTC_SM_EXIT_EVT 0xFFFE
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/*****************************************************************************
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** Type definitions and return values
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******************************************************************************/
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typedef UINT32 btc_sm_state_t;
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typedef UINT32 btc_sm_event_t;
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typedef void *btc_sm_handle_t;
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typedef BOOLEAN (* btc_sm_handler_t)(btc_sm_event_t event, void *data);
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/*****************************************************************************
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** Functions
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**
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** NOTE: THESE APIs SHOULD BE INVOKED ONLY IN THE BTC CONTEXT
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**
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******************************************************************************/
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/*****************************************************************************
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**
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** Function btc_sm_init
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**
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** Description Initializes the state machine with the state handlers
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** The caller should ensure that the table and the corresponding
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** states match. The location that 'p_handlers' points to shall
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** be available until the btc_sm_shutdown API is invoked.
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**
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** Returns Returns a pointer to the initialized state machine handle.
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**
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******************************************************************************/
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btc_sm_handle_t btc_sm_init(const btc_sm_handler_t *p_handlers,
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btc_sm_state_t initial_state);
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/*****************************************************************************
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**
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** Function btc_sm_shutdown
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**
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** Description Tears down the state machine
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**
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** Returns None
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**
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******************************************************************************/
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void btc_sm_shutdown(btc_sm_handle_t handle);
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/*****************************************************************************
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**
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** Function btc_sm_get_state
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**
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** Description Fetches the current state of the state machine
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**
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** Returns Current state
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**
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******************************************************************************/
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btc_sm_state_t btc_sm_get_state(btc_sm_handle_t handle);
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/*****************************************************************************
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**
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** Function btc_sm_dispatch
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**
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** Description Dispatches the 'event' along with 'data' to the current state handler
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**
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** Returns Returns BT_STATUS_OK on success, BT_STATUS_FAIL otherwise
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**
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******************************************************************************/
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bt_status_t btc_sm_dispatch(btc_sm_handle_t handle, btc_sm_event_t event,
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void *data);
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/*****************************************************************************
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**
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** Function btc_sm_change_state
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**
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** Description Make a transition to the new 'state'. The 'BTC_SM_EXIT_EVT'
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** shall be invoked before exiting the current state. The
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** 'BTC_SM_ENTER_EVT' shall be invoked before entering the new state
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**
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**
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** Returns Returns BT_STATUS_OK on success, BT_STATUS_FAIL otherwise
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**
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******************************************************************************/
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bt_status_t btc_sm_change_state(btc_sm_handle_t handle, btc_sm_state_t state);
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#endif /* __BTC_SM_H__ */
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