esp_bt.h

// Copyright 2015-2016 Espressif Systems (Shanghai) PTE LTD
//
// 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 __ESP_BT_H__
#define __ESP_BT_H__

#include <stdint.h>
#include <stdbool.h>
#include "esp_err.h"
#include "sdkconfig.h"
#include "esp_task.h"

#ifdef __cplusplus
extern "C" {
#endif

/**
 * @brief Controller config options, depend on config mask.
 *        Config mask indicate which functions enabled, this means 
 *        some options or parameters of some functions enabled by config mask.
 */
typedef struct {
    uint16_t controller_task_stack_size;    /*!< Bluetooth controller task stack size */
    uint8_t controller_task_prio;           /*!< Bluetooth controller task priority */
    uint8_t hci_uart_no;                    /*!< If use UART1/2 as HCI IO interface, indicate UART number */
    uint32_t hci_uart_baudrate;             /*!< If use UART1/2 as HCI IO interface, indicate UART baudrate */
} esp_bt_controller_config_t;

#ifdef CONFIG_BT_ENABLED

#ifdef CONFIG_BT_HCI_UART_NO
#define BT_HCI_UART_NO_DEFAULT CONFIG_BT_HCI_UART_NO
#else
#define BT_HCI_UART_NO_DEFAULT 1
#endif /* BT_HCI_UART_NO_DEFAULT */

#ifdef CONFIG_BT_HCI_UART_BAUDRATE
#define BT_HCI_UART_BAUDRATE_DEFAULT CONFIG_BT_HCI_UART_BAUDRATE
#else
#define BT_HCI_UART_BAUDRATE_DEFAULT 921600
#endif /* BT_HCI_UART_BAUDRATE_DEFAULT */

#define BT_CONTROLLER_INIT_CONFIG_DEFAULT() {                       \
    .controller_task_stack_size = ESP_TASK_BT_CONTROLLER_STACK,     \
    .controller_task_prio = ESP_TASK_BT_CONTROLLER_PRIO,            \
    .hci_uart_no = BT_HCI_UART_NO_DEFAULT,                          \
    .hci_uart_baudrate = BT_HCI_UART_BAUDRATE_DEFAULT,              \
};
#else
#define BT_CONTROLLER_INIT_CONFIG_DEFAULT() {0}; _Static_assert(0, "please enable bluetooth in menuconfig to use bt.h");
#endif

/**
 * @brief Bluetooth mode for controller enable/disable
 */
typedef enum {
    ESP_BT_MODE_IDLE       = 0x00,   /*!< Bluetooth is not running */
    ESP_BT_MODE_BLE        = 0x01,   /*!< Run BLE mode */
    ESP_BT_MODE_CLASSIC_BT = 0x02,   /*!< Run Classic BT mode */
    ESP_BT_MODE_BTDM       = 0x03,   /*!< Run dual mode */
} esp_bt_mode_t;

/**
 * @brief Bluetooth controller enable/disable/initialised/de-initialised status
 */
typedef enum {
    ESP_BT_CONTROLLER_STATUS_IDLE = 0,
    ESP_BT_CONTROLLER_STATUS_INITED,
    ESP_BT_CONTROLLER_STATUS_ENABLED,
    ESP_BT_CONTROLLER_STATUS_NUM,
} esp_bt_controller_status_t;


/**
 * @brief BLE tx power type
 *        ESP_BLE_PWR_TYPE_CONN_HDL0-8: for each connection, and only be set after connetion completed.
 *                                      when disconnect, the correspond TX power is not effected.
 *        ESP_BLE_PWR_TYPE_ADV : for advertising/scan response.
 *        ESP_BLE_PWR_TYPE_SCAN : for scan.
 *        ESP_BLE_PWR_TYPE_DEFAULT : if each connection's TX power is not set, it will use this default value.
 *                                   if neither in scan mode nor in adv mode, it will use this default value.
 *        If none of power type is set, system will use ESP_PWR_LVL_P1 as default for ADV/SCAN/CONN0-9.
 */
typedef enum {
    ESP_BLE_PWR_TYPE_CONN_HDL0  = 0,            /*!< For connection handle 0 */
    ESP_BLE_PWR_TYPE_CONN_HDL1  = 1,            /*!< For connection handle 1 */
    ESP_BLE_PWR_TYPE_CONN_HDL2  = 2,            /*!< For connection handle 2 */
    ESP_BLE_PWR_TYPE_CONN_HDL3  = 3,            /*!< For connection handle 3 */
    ESP_BLE_PWR_TYPE_CONN_HDL4  = 4,            /*!< For connection handle 4 */
    ESP_BLE_PWR_TYPE_CONN_HDL5  = 5,            /*!< For connection handle 5 */
    ESP_BLE_PWR_TYPE_CONN_HDL6  = 6,            /*!< For connection handle 6 */
    ESP_BLE_PWR_TYPE_CONN_HDL7  = 7,            /*!< For connection handle 7 */
    ESP_BLE_PWR_TYPE_CONN_HDL8  = 8,            /*!< For connection handle 8 */
    ESP_BLE_PWR_TYPE_ADV        = 9,            /*!< For advertising */
    ESP_BLE_PWR_TYPE_SCAN       = 10,           /*!< For scan */
    ESP_BLE_PWR_TYPE_DEFAULT    = 11,           /*!< For default, if not set other, it will use default value */
    ESP_BLE_PWR_TYPE_NUM        = 12,           /*!< TYPE numbers */
} esp_ble_power_type_t;

/**
 * @brief Bluetooth TX power level(index), it's just a index corresponding to power(dbm).
 */
typedef enum {
    ESP_PWR_LVL_N14 = 0,            /*!< Corresponding to -14dbm */
    ESP_PWR_LVL_N11 = 1,            /*!< Corresponding to -11dbm */
    ESP_PWR_LVL_N8  = 2,            /*!< Corresponding to  -8dbm */
    ESP_PWR_LVL_N5  = 3,            /*!< Corresponding to  -5dbm */
    ESP_PWR_LVL_N2  = 4,            /*!< Corresponding to  -2dbm */
    ESP_PWR_LVL_P1  = 5,            /*!< Corresponding to   1dbm */
    ESP_PWR_LVL_P4  = 6,            /*!< Corresponding to   4dbm */
    ESP_PWR_LVL_P7  = 7,            /*!< Corresponding to   7dbm */
} esp_power_level_t;

/**
 * @brief  Set BLE TX power
 *         Connection Tx power should only be set after connection created.
 * @param  power_type : The type of which tx power, could set Advertising/Connection/Default and etc
 * @param  power_level: Power level(index) corresponding to absolute value(dbm)
 * @return              ESP_OK - success, other - failed
 */
esp_err_t esp_ble_tx_power_set(esp_ble_power_type_t power_type, esp_power_level_t power_level);

/**
 * @brief  Get BLE TX power
 *         Connection Tx power should only be get after connection created.
 * @param  power_type : The type of which tx power, could set Advertising/Connection/Default and etc
 * @return             >= 0 - Power level, < 0 - Invalid
 */
esp_power_level_t esp_ble_tx_power_get(esp_ble_power_type_t power_type);


/**
 * @brief  Initialize BT controller to allocate task and other resource.
 * @param  cfg: Initial configuration of BT controller.
 * This function should be called only once, before any other BT functions are called.
 * @return       ESP_OK - success, other - failed
 */
esp_err_t esp_bt_controller_init(esp_bt_controller_config_t *cfg);

/**
 * @brief  De-initialize BT controller to free resource and delete task.
 *
 * This function should be called only once, after any other BT functions are called.
 * This function is not whole completed, esp_bt_controller_init cannot called after this function.
 * @return  ESP_OK - success, other - failed
 */
esp_err_t esp_bt_controller_deinit(void);

/**
 * @brief Enable BT controller.
 *               Due to a known issue, you cannot call esp_bt_controller_enable() a second time
 *               to change the controller mode dynamically. To change controller mode, call
 *               esp_bt_controller_disable() and then call esp_bt_controller_enable() with the new mode.
 * @param mode : the mode(BLE/BT/BTDM) to enable.
 * @return       ESP_OK - success, other - failed
 */
esp_err_t esp_bt_controller_enable(esp_bt_mode_t mode);

/**
 * @brief  Disable BT controller
 * @return       ESP_OK - success, other - failed
 */
esp_err_t esp_bt_controller_disable(void);

/**
 * @brief  Get BT controller is initialised/de-initialised/enabled/disabled
 * @return status value
 */
esp_bt_controller_status_t esp_bt_controller_get_status(void);

/** @brief esp_vhci_host_callback
 *  used for vhci call host function to notify what host need to do
 */
typedef struct esp_vhci_host_callback {
    void (*notify_host_send_available)(void);               /*!< callback used to notify that the host can send packet to controller */
    int (*notify_host_recv)(uint8_t *data, uint16_t len);   /*!< callback used to notify that the controller has a packet to send to the host*/
} esp_vhci_host_callback_t;

/** @brief esp_vhci_host_check_send_available
 *  used for check actively if the host can send packet to controller or not.
 *  @return true for ready to send, false means cannot send packet
 */
bool esp_vhci_host_check_send_available(void);

/** @brief esp_vhci_host_send_packet
 * host send packet to controller
 * @param data the packet point
 *,@param len the packet length
 */
void esp_vhci_host_send_packet(uint8_t *data, uint16_t len);

/** @brief esp_vhci_host_register_callback
 * register the vhci referece callback, the call back
 * struct defined by vhci_host_callback structure.
 * @param callback esp_vhci_host_callback type variable
 */
void esp_vhci_host_register_callback(const esp_vhci_host_callback_t *callback);

/** @brief esp_bt_controller_mem_release
 * release the memory by mode, if never use the bluetooth mode
 * it can release the .bbs, .data and other section to heap.
 * The total size is about 70k bytes.
 *
 * esp_bt_controller_mem_release(mode) should be called only before esp_bt_controller_init()
 * or after esp_bt_controller_deinit().
 *
 * Note that once BT controller memory is released, the process cannot be reversed. It means you can not use the bluetooth
 * mode which you have released by this function.
 *
 * If your firmware will later upgrade the Bluetooth controller mode (BLE -> BT Classic or disabled -> enabled)
 * then do not call this function.
 *
 * If the app calls esp_bt_controller_enable(ESP_BT_MODE_BLE) to use BLE only then it is safe to call
 * esp_bt_controller_mem_release(ESP_BT_MODE_CLASSIC_BT) at initialisation time to free unused BT Classic memory.
 *
 * If user never use bluetooth controller, could call esp_bt_controller_mem_release(ESP_BT_MODE_BTDM)
 * before esp_bt_controller_init or after esp_bt_controller_deinit.
 *
 * For example, user only use bluetooth to config SSID and PASSWORD of WIFI, after config, will never use bluetooth.
 * Then, could call esp_bt_controller_mem_release(ESP_BT_MODE_BTDM) after esp_bt_controller_deinit.
 *
 * @param mode : the mode want to release memory
 * @return ESP_OK - success, other - failed
 */
esp_err_t esp_bt_controller_mem_release(esp_bt_mode_t mode);

#ifdef __cplusplus
}
#endif

#endif /* __ESP_BT_H__ */