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Introduction to esp32 Bluetooth controller API
2022-04-23 01:50:00 【Wireless_ Link】
Preface ：
This article mainly introduces ESP32 bluetooth controller Of API, Through this article, you will gain the following ：
1）ESP32 Bluetooth architecture
2）ESP32 bluetooth controller API Use
zero . Statement
We will continue to update this column in serial form , This column plans to update as follows ：
Chapter one :ESP-IDF Basic introduction , It mainly involves modules , chip , Introduction to the development board , Environment building , Program compilation and download , Start the process and other basic operations , Make you right ESP-IDF Development has an overall understanding , Lay a foundation for our follow-up study ！
Second articles :ESP32-IDF Introduction to peripheral drivers , Mainly based on esp-idf The existing driver, Provide drivers for various peripherals , such as LED,OLED,SPI LCD,TOUCH, infrared ,Codec ic wait , In this article , We're not just doing peripheral drivers , It will also introduce the commonly used peripheral bus , Let everyone know what it is and why ！
Third articles : At present, it is quite hot GUI LVGL Introduce , Mainly design LVGL7.1,LVGL8 Introduction to migration of , It will also introduce various components , After knowing the principle , Last , We will launch a configuration software to build our GUI, To improve our efficiency ！
Fourth articles :ESP32- bluetooth , Familiar with my , We should all know , Even if I am engaged in the development of Bluetooth protocol stack , So this is our unique advantage , In this chapter , We will provide more than just knowledge of Bluetooth application methods , It will also apply the theory of combining Bluetooth underlying protocol stack , Let you completely get through the Bluetooth Ren Du pulse from top to bottom ！
Chapter five ：Wi-Fi Introduce , Familiar with my , I should know , We also made one sdio wifi Driving tutorial board , So in wifi We also have unique advantages in this regard , In this chapter , We also don't just offer Wi-Fi Knowledge of application , It will also be combined with the underlying theory , Make you right Wi-Fi There's a clear perception ！
in addition , Our tutorial includes but is not limited to the above chapters , To give you a better navigation , The following information is particularly important , Please check in detail ！！
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One . summary
In the previous chapter , We saw it ESP32 Bluetooth architecture , As shown in the figure below
Let's introduce Bluetooth in this chapter controller dependent API,API The document links are as follows ：
Controller && VHCI - ESP32 - — ESP-IDF Programming Guide v4.4.1 file
Unfortunately ：ESP32 Not open Controller Of source code, So we can only see API docu!
Two . API Introduce
controller Part of the API stay bt/include/esp32/include/esp_bt.h In file
esp_err_t esp_ble_tx_power_set (esp_ble_power_type_t power_type, esp_power_level_t power_level)
effect ： Set up BLE Of tx power, Divided into radio / Search for / Connected , Connected TX power Can only be used after connection
| Parameters 1: power_type tx power The type of |
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; |
| Parameters 2: power_level tx power The level of |
typedef enum { ESP_PWR_LVL_N12 = 0, /*!< Corresponding to -12dbm */ ESP_PWR_LVL_N9 = 1, /*!< Corresponding to -9dbm */ ESP_PWR_LVL_N6 = 2, /*!< Corresponding to -6dbm */ ESP_PWR_LVL_N3 = 3, /*!< Corresponding to -3dbm */ ESP_PWR_LVL_N0 = 4, /*!< Corresponding to 0dbm */ ESP_PWR_LVL_P3 = 5, /*!< Corresponding to +3dbm */ ESP_PWR_LVL_P6 = 6, /*!< Corresponding to +6dbm */ ESP_PWR_LVL_P9 = 7, /*!< Corresponding to +9dbm */ ESP_PWR_LVL_N14 = ESP_PWR_LVL_N12, /*!< Backward compatibility! Setting to -14dbm will actually result to -12dbm */ ESP_PWR_LVL_N11 = ESP_PWR_LVL_N9, /*!< Backward compatibility! Setting to -11dbm will actually result to -9dbm */ ESP_PWR_LVL_N8 = ESP_PWR_LVL_N6, /*!< Backward compatibility! Setting to -8dbm will actually result to -6dbm */ ESP_PWR_LVL_N5 = ESP_PWR_LVL_N3, /*!< Backward compatibility! Setting to -5dbm will actually result to -3dbm */ ESP_PWR_LVL_N2 = ESP_PWR_LVL_N0, /*!< Backward compatibility! Setting to -2dbm will actually result to 0dbm */ ESP_PWR_LVL_P1 = ESP_PWR_LVL_P3, /*!< Backward compatibility! Setting to +1dbm will actually result to +3dbm */ ESP_PWR_LVL_P4 = ESP_PWR_LVL_P6, /*!< Backward compatibility! Setting to +4dbm will actually result to +6dbm */ ESP_PWR_LVL_P7 = ESP_PWR_LVL_P9, /*!< Backward compatibility! Setting to +7dbm will actually result to +9dbm */ } esp_power_level_t; |
| Return value : esp_err_t |
typedef int esp_err_t; /* Definitions for error constants. */ #define ESP_OK 0 /*!< esp_err_t value indicating success (no error) */ #define ESP_FAIL -1 /*!< Generic esp_err_t code indicating failure */ #define ESP_ERR_NO_MEM 0x101 /*!< Out of memory */ #define ESP_ERR_INVALID_ARG 0x102 /*!< Invalid argument */ #define ESP_ERR_INVALID_STATE 0x103 /*!< Invalid state */ #define ESP_ERR_INVALID_SIZE 0x104 /*!< Invalid size */ #define ESP_ERR_NOT_FOUND 0x105 /*!< Requested resource not found */ #define ESP_ERR_NOT_SUPPORTED 0x106 /*!< Operation or feature not supported */ #define ESP_ERR_TIMEOUT 0x107 /*!< Operation timed out */ #define ESP_ERR_INVALID_RESPONSE 0x108 /*!< Received response was invalid */ #define ESP_ERR_INVALID_CRC 0x109 /*!< CRC or checksum was invalid */ #define ESP_ERR_INVALID_VERSION 0x10A /*!< Version was invalid */ #define ESP_ERR_INVALID_MAC 0x10B /*!< MAC address was invalid */ #define ESP_ERR_WIFI_BASE 0x3000 /*!< Starting number of WiFi error codes */ #define ESP_ERR_MESH_BASE 0x4000 /*!< Starting number of MESH error codes */ #define ESP_ERR_FLASH_BASE 0x6000 /*!< Starting number of flash error codes */ #define ESP_ERR_HW_CRYPTO_BASE 0xc000 /*!< Starting number of HW cryptography module error codes */ |
esp_power_level_t esp_ble_tx_power_get(esp_ble_power_type_t power_type)
effect ： According to the specific tx power type , To get ble tx power Level of
| Parameters 1：power_type tx power The level of |
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; |
| Return value ：power_level |
typedef enum { ESP_PWR_LVL_N12 = 0, /*!< Corresponding to -12dbm */ ESP_PWR_LVL_N9 = 1, /*!< Corresponding to -9dbm */ ESP_PWR_LVL_N6 = 2, /*!< Corresponding to -6dbm */ ESP_PWR_LVL_N3 = 3, /*!< Corresponding to -3dbm */ ESP_PWR_LVL_N0 = 4, /*!< Corresponding to 0dbm */ ESP_PWR_LVL_P3 = 5, /*!< Corresponding to +3dbm */ ESP_PWR_LVL_P6 = 6, /*!< Corresponding to +6dbm */ ESP_PWR_LVL_P9 = 7, /*!< Corresponding to +9dbm */ ESP_PWR_LVL_N14 = ESP_PWR_LVL_N12, /*!< Backward compatibility! Setting to -14dbm will actually result to -12dbm */ ESP_PWR_LVL_N11 = ESP_PWR_LVL_N9, /*!< Backward compatibility! Setting to -11dbm will actually result to -9dbm */ ESP_PWR_LVL_N8 = ESP_PWR_LVL_N6, /*!< Backward compatibility! Setting to -8dbm will actually result to -6dbm */ ESP_PWR_LVL_N5 = ESP_PWR_LVL_N3, /*!< Backward compatibility! Setting to -5dbm will actually result to -3dbm */ ESP_PWR_LVL_N2 = ESP_PWR_LVL_N0, /*!< Backward compatibility! Setting to -2dbm will actually result to 0dbm */ ESP_PWR_LVL_P1 = ESP_PWR_LVL_P3, /*!< Backward compatibility! Setting to +1dbm will actually result to +3dbm */ ESP_PWR_LVL_P4 = ESP_PWR_LVL_P6, /*!< Backward compatibility! Setting to +4dbm will actually result to +6dbm */ ESP_PWR_LVL_P7 = ESP_PWR_LVL_P9, /*!< Backward compatibility! Setting to +7dbm will actually result to +9dbm */ } esp_power_level_t; |
esp_err_t esp_bredr_tx_power_set(esp_power_level_t min_power_level, esp_power_level_t max_power_level)
effect ： Set up BR/EDR Of tx power, This function will work on the whole traditional Bluetooth , Include search ,paging, Connections etc. , Must be in esp_bt_controller_enable Function and after RF do TX Set before action ！
| Parameters 1：min_power_level Set up tx powr The minimum value of |
typedef enum { ESP_PWR_LVL_N12 = 0, /*!< Corresponding to -12dbm */ ESP_PWR_LVL_N9 = 1, /*!< Corresponding to -9dbm */ ESP_PWR_LVL_N6 = 2, /*!< Corresponding to -6dbm */ ESP_PWR_LVL_N3 = 3, /*!< Corresponding to -3dbm */ ESP_PWR_LVL_N0 = 4, /*!< Corresponding to 0dbm */ ESP_PWR_LVL_P3 = 5, /*!< Corresponding to +3dbm */ ESP_PWR_LVL_P6 = 6, /*!< Corresponding to +6dbm */ ESP_PWR_LVL_P9 = 7, /*!< Corresponding to +9dbm */ ESP_PWR_LVL_N14 = ESP_PWR_LVL_N12, /*!< Backward compatibility! Setting to -14dbm will actually result to -12dbm */ ESP_PWR_LVL_N11 = ESP_PWR_LVL_N9, /*!< Backward compatibility! Setting to -11dbm will actually result to -9dbm */ ESP_PWR_LVL_N8 = ESP_PWR_LVL_N6, /*!< Backward compatibility! Setting to -8dbm will actually result to -6dbm */ ESP_PWR_LVL_N5 = ESP_PWR_LVL_N3, /*!< Backward compatibility! Setting to -5dbm will actually result to -3dbm */ ESP_PWR_LVL_N2 = ESP_PWR_LVL_N0, /*!< Backward compatibility! Setting to -2dbm will actually result to 0dbm */ ESP_PWR_LVL_P1 = ESP_PWR_LVL_P3, /*!< Backward compatibility! Setting to +1dbm will actually result to +3dbm */ ESP_PWR_LVL_P4 = ESP_PWR_LVL_P6, /*!< Backward compatibility! Setting to +4dbm will actually result to +6dbm */ ESP_PWR_LVL_P7 = ESP_PWR_LVL_P9, /*!< Backward compatibility! Setting to +7dbm will actually result to +9dbm */ } esp_power_level_t; |
| Parameters 2：max_power_level Set up tx powr The maximum of |
typedef enum { ESP_PWR_LVL_N12 = 0, /*!< Corresponding to -12dbm */ ESP_PWR_LVL_N9 = 1, /*!< Corresponding to -9dbm */ ESP_PWR_LVL_N6 = 2, /*!< Corresponding to -6dbm */ ESP_PWR_LVL_N3 = 3, /*!< Corresponding to -3dbm */ ESP_PWR_LVL_N0 = 4, /*!< Corresponding to 0dbm */ ESP_PWR_LVL_P3 = 5, /*!< Corresponding to +3dbm */ ESP_PWR_LVL_P6 = 6, /*!< Corresponding to +6dbm */ ESP_PWR_LVL_P9 = 7, /*!< Corresponding to +9dbm */ ESP_PWR_LVL_N14 = ESP_PWR_LVL_N12, /*!< Backward compatibility! Setting to -14dbm will actually result to -12dbm */ ESP_PWR_LVL_N11 = ESP_PWR_LVL_N9, /*!< Backward compatibility! Setting to -11dbm will actually result to -9dbm */ ESP_PWR_LVL_N8 = ESP_PWR_LVL_N6, /*!< Backward compatibility! Setting to -8dbm will actually result to -6dbm */ ESP_PWR_LVL_N5 = ESP_PWR_LVL_N3, /*!< Backward compatibility! Setting to -5dbm will actually result to -3dbm */ ESP_PWR_LVL_N2 = ESP_PWR_LVL_N0, /*!< Backward compatibility! Setting to -2dbm will actually result to 0dbm */ ESP_PWR_LVL_P1 = ESP_PWR_LVL_P3, /*!< Backward compatibility! Setting to +1dbm will actually result to +3dbm */ ESP_PWR_LVL_P4 = ESP_PWR_LVL_P6, /*!< Backward compatibility! Setting to +4dbm will actually result to +6dbm */ ESP_PWR_LVL_P7 = ESP_PWR_LVL_P9, /*!< Backward compatibility! Setting to +7dbm will actually result to +9dbm */ } esp_power_level_t; |
| Return value ：esp_err_t |
It has been introduced earlier |
esp_err_t esp_bredr_tx_power_get(esp_power_level_t *min_power_level, esp_power_level_t *max_power_level)
effect ： obtain BR/EDR Of tx power Minimum / Great value
| Parameters 1：*min_power_level The pointer , Minimum returned tx power |
It has been introduced earlier |
| Parameters 2：*max_power_level The pointer , Maximum returned tx power |
It has been introduced earlier |
| Return value :esp_err_t |
It has been introduced earlier |
esp_err_t esp_bredr_sco_datapath_set(esp_sco_data_path_t data_path)
effect ： Set up BR/EDR Of sco The data path of , belong controller enable Then call , And in (e)SCO Build before link
| Parameters 1：data_path sco The data path of |
typedef enum { ESP_SCO_DATA_PATH_HCI = 0, /*!< data over HCI transport */ ESP_SCO_DATA_PATH_PCM = 1, /*!< data over PCM interface */ } esp_sco_data_path_t; |
| Return value ：esp_err_t |
It has been introduced earlier |
esp_err_t esp_bt_controller_init(esp_bt_controller_config_t *cfg)
effect ： according to config To do controller The initialization
| Parameters 1：*cfg controller Configuration parameters for |
typedef struct { /* * Following parameters can be configured runtime, when call esp_bt_controller_init() */ 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 */ uint8_t scan_duplicate_mode; /*!< scan duplicate mode */ uint8_t scan_duplicate_type; /*!< scan duplicate type */ uint16_t normal_adv_size; /*!< Normal adv size for scan duplicate */ uint16_t mesh_adv_size; /*!< Mesh adv size for scan duplicate */ uint16_t send_adv_reserved_size; /*!< Controller minimum memory value */ uint32_t controller_debug_flag; /*!< Controller debug log flag */ uint8_t mode; /*!< Controller mode: BR/EDR, BLE or Dual Mode */ uint8_t ble_max_conn; /*!< BLE maximum connection numbers */ uint8_t bt_max_acl_conn; /*!< BR/EDR maximum ACL connection numbers */ uint8_t bt_sco_datapath; /*!< SCO data path, i.e. HCI or PCM module */ bool auto_latency; /*!< BLE auto latency, used to enhance classic BT performance */ bool bt_legacy_auth_vs_evt; /*!< BR/EDR Legacy auth complete event required to protect from BIAS attack */ /* * Following parameters can not be configured runtime when call esp_bt_controller_init() * It will be overwrite with a constant value which in menuconfig or from a macro. * So, do not modify the value when esp_bt_controller_init() */ uint8_t bt_max_sync_conn; /*!< BR/EDR maximum ACL connection numbers. Effective in menuconfig */ uint8_t ble_sca; /*!< BLE low power crystal accuracy index */ uint8_t pcm_role; /*!< PCM role (master & slave)*/ uint8_t pcm_polar; /*!< PCM polar trig (falling clk edge & rising clk edge) */ uint32_t magic; /*!< Magic number */ } esp_bt_controller_config_t; |
| Return value ：esp_err_t |
It has been introduced earlier |
esp_err_t esp_bt_controller_deinit(void)
effect ：De-initialize BT controller
esp_err_t esp_bt_controller_enable(esp_bt_mode_t mode)
effect ：Enable bluetooth controller
| Parameters 1：mode |
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; |
| Return value ：esp_err_t |
It has been introduced earlier |
esp_err_t esp_bt_controller_disable(void)
effect ：Disable bluetooth controller
esp_bt_controller_status_t esp_bt_controller_get_status(void)
effect ： obtain controller The state of
| Return value ：esp_bt_controller_status_t |
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; |
bool esp_vhci_host_check_send_available(void)
effect ： Check if you can controller send data
void esp_vhci_host_send_packet(uint8_t *data, uint16_t len)
effect ：Host Send data to Controller
| Parameters 1： *data |
Host Ready to send to Controller The data of |
| Parameters 2： len |
Host Ready to send to Controller The data length of |
esp_err_t esp_vhci_host_register_callback(const esp_vhci_host_callback_t *callback)
effect ：host image controller register callback function , Include sendable callback With receiving data callback
| Parameters 1：*callback |
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; |
| Return value ：esp_err_t |
It has been introduced earlier |
esp_err_t esp_bt_controller_mem_release(esp_bt_mode_t mode)
effect ： Release bt controller Of bss,heap data , Save memory , Only in esp_bt_controller_init Call before function or top note esp_bt_controller_deinit Call after function , The general usage is that you use BR/EDR, Then you release BLE, If you use BLE, Then release BR/EDR Of
| Parameters 1：mode |
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; |
| Return value ：esp_err_t |
It has been introduced earlier |
esp_err_t esp_bt_mem_release(esp_bt_mode_t mode)
effect ： Free memory , First of all, I will call esp_bt_controller_mem_release function
esp_err_t esp_bt_sleep_enable(void)
effect ： Can make bt controller Dormancy of
esp_err_t esp_bt_sleep_disable(void)
effect ： prohibit bt controller Sleep
esp_err_t esp_ble_scan_dupilcate_list_flush(void)
effect ： Manually remove BLE scan list ()
The one we use most often is esp_bt_controller_init/esp_bt_controller_enable/esp_bt_controller_disable/esp_bt_controller_deinit, Let's draw the flow of these functions
版权声明
本文为[Wireless_ Link]所创，转载请带上原文链接，感谢
https://yzsam.com/2022/04/202204230144192841.html
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