src/class/bth/bth_device.h

/*
 * SPDX-FileCopyrightText: Copyright (c) 2020 Jerzy Kasenberg
 * SPDX-FileCopyrightText: Copyright (c) 2020 Ha Thach (tinyusb.org)
 * SPDX-License-Identifier: MIT
 *
 * This file is part of the TinyUSB stack.
 */

#ifndef TUSB_BTH_DEVICE_H_
#define TUSB_BTH_DEVICE_H_

#include <common/tusb_common.h>
#include <device/usbd.h>

//--------------------------------------------------------------------+
// Class Driver Configuration
//--------------------------------------------------------------------+
#ifndef CFG_TUD_BTH_EVENT_EPSIZE
#define CFG_TUD_BTH_EVENT_EPSIZE     16
#endif

#ifndef CFG_TUD_BTH_DATA_EPSIZE
#define CFG_TUD_BTH_DATA_EPSIZE      64
#endif

// Allow BTH class to work in historically compatibility mode where the bRequest is always 0xe0.
// See Bluetooth Core v5.3, Vol. 4, Part B, Section 2.2
#ifndef CFG_TUD_BTH_HISTORICAL_COMPATIBLE
#define CFG_TUD_BTH_HISTORICAL_COMPATIBLE 0
#endif

typedef struct TU_ATTR_PACKED
{
  uint16_t op_code;
  uint8_t param_length;
  uint8_t param[255];
} bt_hci_cmd_t;

#ifdef __cplusplus
 extern "C" {
#endif

//--------------------------------------------------------------------+
// Application Callback API (weak is optional)
//--------------------------------------------------------------------+

// Invoked when HCI command was received over USB from Bluetooth host.
// Detailed format is described in Bluetooth core specification Vol 2,
// Part E, 5.4.1.
// Length of the command is from 3 bytes (2 bytes for OpCode,
// 1 byte for parameter total length) to 258.
void tud_bt_hci_cmd_cb(void *hci_cmd, size_t cmd_len);

// Invoked when ACL data was received over USB from Bluetooth host.
// Detailed format is described in Bluetooth core specification Vol 2,
// Part E, 5.4.2.
// Length is from 4 bytes, (12 bits for Handle, 4 bits for flags
// and 16 bits for data total length) to endpoint size.
void tud_bt_acl_data_received_cb(void *acl_data, uint16_t data_len);

// Called when event sent with tud_bt_event_send() was delivered to BT stack.
// Controller can release/reuse buffer with Event packet at this point.
void tud_bt_event_sent_cb(uint16_t sent_bytes);

// Called when ACL data that was sent with tud_bt_acl_data_send()
// was delivered to BT stack.
// Controller can release/reuse buffer with ACL packet at this point.
void tud_bt_acl_data_sent_cb(uint16_t sent_bytes);

// Bluetooth controller calls this function when it wants to send even packet
// as described in Bluetooth core specification Vol 2, Part E, 5.4.4.
// Event has at least 2 bytes, first is Event code second contains parameter
// total length. Controller can release/reuse event memory after
// tud_bt_event_sent_cb() is called.
bool tud_bt_event_send(void *event, uint16_t event_len);

// Bluetooth controller calls this to send ACL data packet
// as described in Bluetooth core specification Vol 2, Part E, 5.4.2
// Minimum length is 4 bytes, (12 bits for Handle, 4 bits for flags
// and 16 bits for data total length). Upper limit is not limited
// to endpoint size since buffer is allocate by controller
// and must not be reused till tud_bt_acl_data_sent_cb() is called.
bool tud_bt_acl_data_send(void *acl_data, uint16_t data_len);

//--------------------------------------------------------------------+
// Internal Class Driver API
//--------------------------------------------------------------------+
void     btd_init            (void);
bool     btd_deinit          (void);
void     btd_reset           (uint8_t rhport);
uint16_t btd_open            (uint8_t rhport, tusb_desc_interface_t const * itf_desc, uint16_t max_len);
bool     btd_control_xfer_cb (uint8_t rhport, uint8_t stage, tusb_control_request_t const *request);
bool     btd_xfer_cb         (uint8_t rhport, uint8_t edpt_addr, xfer_result_t result, uint32_t xferred_bytes);

#ifdef __cplusplus
 }
#endif

#endif /* TUSB_BTH_DEVICE_H_ */