esp-idf/components/bt/host/bluedroid/hci/include/hci/hci_hal.h
2019-06-30 16:39:00 +08:00

86 lines
3.2 KiB
C

/******************************************************************************
*
* Copyright (C) 2014 Google, Inc.
*
* 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.
*
******************************************************************************/
#ifndef _HCI_HAL_H_
#define _HCI_HAL_H_
#include <stdbool.h>
#include <stdint.h>
#include "stack/bt_types.h"
typedef enum {
DATA_TYPE_COMMAND = 1,
DATA_TYPE_ACL = 2,
DATA_TYPE_SCO = 3,
DATA_TYPE_EVENT = 4
} serial_data_type_t;
typedef void (*packet_ready_cb)(BT_HDR *packet);
typedef struct {
// Called when the HAL detects inbound data.
// Data |type| may be ACL, SCO, or EVENT.
// Executes in the context of the thread supplied to |init|.
packet_ready_cb packet_ready;
/*
// Called when the HAL detects inbound astronauts named Dave.
// HAL will deny all requests to open the pod bay doors after this.
dave_ready_cb dave_ready;
*/
} hci_hal_callbacks_t;
typedef struct hci_hal_t {
// Initialize the HAL, with |upper_callbacks| and |upper_thread| to run in the context of.
//bool (*init)(const hci_hal_callbacks_t *upper_callbacks);
// Connect to the underlying hardware, and let data start flowing.
bool (*open)(const hci_hal_callbacks_t *upper_callbacks, void *task_thread);
// Disconnect from the underlying hardware, and close the HAL.
// "Daisy, Daisy..."
void (*close)(void);
// Retrieve up to |max_size| bytes for ACL, SCO, or EVENT data packets into
// |buffer|, blocking until max_size bytes read if |block| is true.
// Only guaranteed to be correct in the context of a data_ready callback
// of the corresponding type.
//size_t (*read_data)(serial_data_type_t type, uint8_t *buffer, size_t max_size);
// The upper layer must call this to notify the HAL that it has finished
// reading a packet of the specified |type|. Underlying implementations that
// use shared channels for multiple data types depend on this to know when
// to reinterpret the data stream.
//void (*packet_finished)(serial_data_type_t type);
// Transmit COMMAND, ACL, or SCO data packets.
// |data| may not be NULL. |length| must be greater than zero.
//
// IMPORTANT NOTE:
// Depending on the underlying implementation, the byte right
// before the beginning of |data| may be borrowed during this call
// and then restored to its original value.
// This is safe in the bluetooth context, because there is always a buffer
// header that prefixes data you're sending.
uint16_t (*transmit_data)(serial_data_type_t type, uint8_t *data, uint16_t length);
} hci_hal_t;
// Gets the correct hal implementation, as compiled for.
const hci_hal_t *hci_hal_h4_get_interface(void);
#endif /* _HCI_HAL_H */