feat(bt/bluedroid): Added bt_discovery based host only example

examples/bluetooth/bluedroid/bluedroid_host_only/bluedroid_host_only_uart/CMakeLists.txt

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+# The following lines of boilerplate have to be in your project's CMakeLists
+# in this exact order for cmake to work correctly
+cmake_minimum_required(VERSION 3.16)
+
+include($ENV{IDF_PATH}/tools/cmake/project.cmake)
+project(host_hci_uart)

examples/bluetooth/bluedroid/bluedroid_host_only/bluedroid_host_only_uart/README.md

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+| Supported Targets | ESP32 | ESP32-C2 | ESP32-C3 | ESP32-C6 | ESP32-H2 | ESP32-S3 |
+| ----------------- | ----- | -------- | -------- | -------- | -------- | -------- |
+
+ESP-IDF UART HCI Host
+=====================
+
+This is a Bluetooth Host use UART as HCI IO. This require the UART device support RTS/CTS mandatory.
+
+It can do the configuration of UART baudrate by menuconfig.
+
+## Example Layout
+
+This example is modified based on [bt_discovery](../../classic_bt/bt_discovery), and all modifications are listed below:
+
+- Removed all dependencies on controller from `main.c`.
+
+```
+#include "esp_bt.h"
+
+...
+
+ESP_ERROR_CHECK(esp_bt_controller_mem_release(ESP_BT_MODE_BLE));
+
+esp_bt_controller_config_t bt_cfg = BT_CONTROLLER_INIT_CONFIG_DEFAULT();
+if ((ret = esp_bt_controller_init(&bt_cfg)) != ESP_OK) {
+    ESP_LOGE(GAP_TAG, "%s initialize controller failed: %s", __func__, esp_err_to_name(ret));
+    return;
+}
+
+if ((ret = esp_bt_controller_enable(ESP_BT_MODE_CLASSIC_BT)) != ESP_OK) {
+    ESP_LOGE(GAP_TAG, "%s enable controller failed: %s", __func__, esp_err_to_name(ret));
+    return;
+}
+```
+
+- Add support for uart driver: `uart_driver.c` and `uart_driver.h`.
+
+- Initialize UART driver in `main.c`.
+
+```
+#include "esp_hci_api.h"
+#include "uart_driver.h"
+
+...
+
+/* initialize HCI TRANSPORT first */
+hci_uart_open();
+/* get HCI driver operations */
+esp_bluedroid_hci_driver_operations_t operations = {
+    .send = hci_uart_send,
+    .check_send_available = hci_check_send_available,
+    .register_host_callback = hci_register_host_callback,
+};
+esp_bluedroid_attach_hci_driver(&operations);
+```
+
+## How to use example
+
+### Hardware Required
+
+This example should be able to run on any commonly available ESP development board. To connect UART to another board running a Bluetooth controller. For example, [controller_hci_uart_esp32](../../../hci/controller_hci_uart_esp32).
+
+### Configure the project
+
+```
+idf.py menuconfig
+```
+
+- UART baudrate can be configured in `Example Configuration > UART Baudrate for HCI`
+
+### Build and Flash
+
+Build the project and flash it to the board, then run monitor tool to view serial output:
+
+```
+idf.py -p PORT flash monitor
+```
+
+(Replace PORT with the name of the serial port to use.)
+
+(To exit the serial monitor, type ``Ctrl-]``.)
+
+See the Getting Started Guide for full steps to configure and use ESP-IDF to build projects.
+
+## Troubleshooting

examples/bluetooth/bluedroid/bluedroid_host_only/bluedroid_host_only_uart/main/CMakeLists.txt

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+idf_component_register(SRCS "main.c"
+                            "uart_driver.c"
+                    INCLUDE_DIRS ".")

examples/bluetooth/bluedroid/bluedroid_host_only/bluedroid_host_only_uart/main/Kconfig.projbuild

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+menu "Example Configuration"
+    config EXAMPLE_HCI_UART_BAUDRATE
+        int "UART Baudrate for HCI"
+        range 115200 921600
+        default 921600
+        help
+            UART Baudrate for HCI. Please use standard baudrate.
+endmenu

examples/bluetooth/bluedroid/bluedroid_host_only/bluedroid_host_only_uart/main/main.c

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+/*
+ * SPDX-FileCopyrightText: 2021-2023 Espressif Systems (Shanghai) CO LTD
+ *
+ * SPDX-License-Identifier: Unlicense OR CC0-1.0
+ */
+
+
+
+/****************************************************************************
+*
+* This file is for Classic Bluetooth device and service discovery Demo.
+*
+****************************************************************************/
+
+#include <stdint.h>
+#include <string.h>
+#include <inttypes.h>
+#include "freertos/FreeRTOS.h"
+#include "freertos/task.h"
+#include "nvs.h"
+#include "nvs_flash.h"
+#include "esp_system.h"
+#include "esp_log.h"
+#include "esp_bt_main.h"
+#include "esp_bt_device.h"
+#include "esp_gap_bt_api.h"
+#include "esp_bluedroid_hci.h"
+#include "uart_driver.h"
+
+#define GAP_TAG          "GAP"
+
+typedef enum {
+    APP_GAP_STATE_IDLE = 0,
+    APP_GAP_STATE_DEVICE_DISCOVERING,
+    APP_GAP_STATE_DEVICE_DISCOVER_COMPLETE,
+    APP_GAP_STATE_SERVICE_DISCOVERING,
+    APP_GAP_STATE_SERVICE_DISCOVER_COMPLETE,
+} app_gap_state_t;
+
+typedef struct {
+    bool dev_found;
+    uint8_t bdname_len;
+    uint8_t eir_len;
+    uint8_t rssi;
+    uint32_t cod;
+    uint8_t eir[ESP_BT_GAP_EIR_DATA_LEN];
+    uint8_t bdname[ESP_BT_GAP_MAX_BDNAME_LEN + 1];
+    esp_bd_addr_t bda;
+    app_gap_state_t state;
+} app_gap_cb_t;
+
+static app_gap_cb_t m_dev_info;
+
+static char *bda2str(esp_bd_addr_t bda, char *str, size_t size)
+{
+    if (bda == NULL || str == NULL || size < 18) {
+        return NULL;
+    }
+
+    uint8_t *p = bda;
+    sprintf(str, "%02x:%02x:%02x:%02x:%02x:%02x",
+            p[0], p[1], p[2], p[3], p[4], p[5]);
+    return str;
+}
+
+static char *uuid2str(esp_bt_uuid_t *uuid, char *str, size_t size)
+{
+    if (uuid == NULL || str == NULL) {
+        return NULL;
+    }
+
+    if (uuid->len == 2 && size >= 5) {
+        sprintf(str, "%04x", uuid->uuid.uuid16);
+    } else if (uuid->len == 4 && size >= 9) {
+        sprintf(str, "%08"PRIx32, uuid->uuid.uuid32);
+    } else if (uuid->len == 16 && size >= 37) {
+        uint8_t *p = uuid->uuid.uuid128;
+        sprintf(str, "%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x",
+                p[15], p[14], p[13], p[12], p[11], p[10], p[9], p[8],
+                p[7], p[6], p[5], p[4], p[3], p[2], p[1], p[0]);
+    } else {
+        return NULL;
+    }
+
+    return str;
+}
+
+static bool get_name_from_eir(uint8_t *eir, uint8_t *bdname, uint8_t *bdname_len)
+{
+    uint8_t *rmt_bdname = NULL;
+    uint8_t rmt_bdname_len = 0;
+
+    if (!eir) {
+        return false;
+    }
+
+    rmt_bdname = esp_bt_gap_resolve_eir_data(eir, ESP_BT_EIR_TYPE_CMPL_LOCAL_NAME, &rmt_bdname_len);
+    if (!rmt_bdname) {
+        rmt_bdname = esp_bt_gap_resolve_eir_data(eir, ESP_BT_EIR_TYPE_SHORT_LOCAL_NAME, &rmt_bdname_len);
+    }
+
+    if (rmt_bdname) {
+        if (rmt_bdname_len > ESP_BT_GAP_MAX_BDNAME_LEN) {
+            rmt_bdname_len = ESP_BT_GAP_MAX_BDNAME_LEN;
+        }
+
+        if (bdname) {
+            memcpy(bdname, rmt_bdname, rmt_bdname_len);
+            bdname[rmt_bdname_len] = '\0';
+        }
+        if (bdname_len) {
+            *bdname_len = rmt_bdname_len;
+        }
+        return true;
+    }
+
+    return false;
+}
+
+static void update_device_info(esp_bt_gap_cb_param_t *param)
+{
+    char bda_str[18];
+    uint32_t cod = 0;
+    int32_t rssi = -129; /* invalid value */
+    uint8_t *bdname = NULL;
+    uint8_t bdname_len = 0;
+    uint8_t *eir = NULL;
+    uint8_t eir_len = 0;
+    esp_bt_gap_dev_prop_t *p;
+
+    ESP_LOGI(GAP_TAG, "Device found: %s", bda2str(param->disc_res.bda, bda_str, 18));
+    for (int i = 0; i < param->disc_res.num_prop; i++) {
+        p = param->disc_res.prop + i;
+        switch (p->type) {
+        case ESP_BT_GAP_DEV_PROP_COD:
+            cod = *(uint32_t *)(p->val);
+            ESP_LOGI(GAP_TAG, "--Class of Device: 0x%"PRIx32, cod);
+            break;
+        case ESP_BT_GAP_DEV_PROP_RSSI:
+            rssi = *(int8_t *)(p->val);
+            ESP_LOGI(GAP_TAG, "--RSSI: %"PRId32, rssi);
+            break;
+        case ESP_BT_GAP_DEV_PROP_BDNAME:
+            bdname_len = (p->len > ESP_BT_GAP_MAX_BDNAME_LEN) ? ESP_BT_GAP_MAX_BDNAME_LEN :
+                          (uint8_t)p->len;
+            bdname = (uint8_t *)(p->val);
+            break;
+        case ESP_BT_GAP_DEV_PROP_EIR: {
+            eir_len = p->len;
+            eir = (uint8_t *)(p->val);
+            break;
+        }
+        default:
+            break;
+        }
+    }
+
+    /* search for device with Major device type "PHONE" or "Audio/Video" in COD */
+    app_gap_cb_t *p_dev = &m_dev_info;
+    if (p_dev->dev_found) {
+        return;
+    }
+
+    if (!esp_bt_gap_is_valid_cod(cod) ||
+	    (!(esp_bt_gap_get_cod_major_dev(cod) == ESP_BT_COD_MAJOR_DEV_PHONE) &&
+             !(esp_bt_gap_get_cod_major_dev(cod) == ESP_BT_COD_MAJOR_DEV_AV))) {
+        return;
+    }
+
+    memcpy(p_dev->bda, param->disc_res.bda, ESP_BD_ADDR_LEN);
+    p_dev->dev_found = true;
+
+    p_dev->cod = cod;
+    p_dev->rssi = rssi;
+    if (bdname_len > 0) {
+        memcpy(p_dev->bdname, bdname, bdname_len);
+        p_dev->bdname[bdname_len] = '\0';
+        p_dev->bdname_len = bdname_len;
+    }
+    if (eir_len > 0) {
+        memcpy(p_dev->eir, eir, eir_len);
+        p_dev->eir_len = eir_len;
+    }
+
+    if (p_dev->bdname_len == 0) {
+        get_name_from_eir(p_dev->eir, p_dev->bdname, &p_dev->bdname_len);
+    }
+
+    ESP_LOGI(GAP_TAG, "Found a target device, address %s, name %s", bda_str, p_dev->bdname);
+    p_dev->state = APP_GAP_STATE_DEVICE_DISCOVER_COMPLETE;
+    ESP_LOGI(GAP_TAG, "Cancel device discovery ...");
+    esp_bt_gap_cancel_discovery();
+}
+
+static void bt_app_gap_init(void)
+{
+    app_gap_cb_t *p_dev = &m_dev_info;
+    memset(p_dev, 0, sizeof(app_gap_cb_t));
+
+    p_dev->state = APP_GAP_STATE_IDLE;
+}
+
+static void bt_app_gap_cb(esp_bt_gap_cb_event_t event, esp_bt_gap_cb_param_t *param)
+{
+    app_gap_cb_t *p_dev = &m_dev_info;
+    char bda_str[18];
+    char uuid_str[37];
+
+    switch (event) {
+    case ESP_BT_GAP_DISC_RES_EVT: {
+        update_device_info(param);
+        break;
+    }
+    case ESP_BT_GAP_DISC_STATE_CHANGED_EVT: {
+        if (param->disc_st_chg.state == ESP_BT_GAP_DISCOVERY_STOPPED) {
+            ESP_LOGI(GAP_TAG, "Device discovery stopped.");
+            if ( (p_dev->state == APP_GAP_STATE_DEVICE_DISCOVER_COMPLETE ||
+                    p_dev->state == APP_GAP_STATE_DEVICE_DISCOVERING)
+                    && p_dev->dev_found) {
+                p_dev->state = APP_GAP_STATE_SERVICE_DISCOVERING;
+                ESP_LOGI(GAP_TAG, "Discover services ...");
+                esp_bt_gap_get_remote_services(p_dev->bda);
+            }
+        } else if (param->disc_st_chg.state == ESP_BT_GAP_DISCOVERY_STARTED) {
+            ESP_LOGI(GAP_TAG, "Discovery started.");
+        }
+        break;
+    }
+    case ESP_BT_GAP_RMT_SRVCS_EVT: {
+        if (memcmp(param->rmt_srvcs.bda, p_dev->bda, ESP_BD_ADDR_LEN) == 0 &&
+                p_dev->state == APP_GAP_STATE_SERVICE_DISCOVERING) {
+            p_dev->state = APP_GAP_STATE_SERVICE_DISCOVER_COMPLETE;
+            if (param->rmt_srvcs.stat == ESP_BT_STATUS_SUCCESS) {
+                ESP_LOGI(GAP_TAG, "Services for device %s found",  bda2str(p_dev->bda, bda_str, 18));
+                for (int i = 0; i < param->rmt_srvcs.num_uuids; i++) {
+                    esp_bt_uuid_t *u = param->rmt_srvcs.uuid_list + i;
+                    ESP_LOGI(GAP_TAG, "--%s", uuid2str(u, uuid_str, 37));
+                }
+            } else {
+                ESP_LOGI(GAP_TAG, "Services for device %s not found",  bda2str(p_dev->bda, bda_str, 18));
+            }
+        }
+        break;
+    }
+    case ESP_BT_GAP_RMT_SRVC_REC_EVT:
+    default: {
+        ESP_LOGI(GAP_TAG, "event: %d", event);
+        break;
+    }
+    }
+    return;
+}
+
+static void bt_app_gap_start_up(void)
+{
+    /* register GAP callback function */
+    esp_bt_gap_register_callback(bt_app_gap_cb);
+
+    char *dev_name = "ESP_GAP_INQRUIY";
+    esp_bt_dev_set_device_name(dev_name);
+
+    /* set discoverable and connectable mode, wait to be connected */
+    esp_bt_gap_set_scan_mode(ESP_BT_CONNECTABLE, ESP_BT_GENERAL_DISCOVERABLE);
+
+    /* inititialize device information and status */
+    bt_app_gap_init();
+
+    /* start to discover nearby Bluetooth devices */
+    app_gap_cb_t *p_dev = &m_dev_info;
+    p_dev->state = APP_GAP_STATE_DEVICE_DISCOVERING;
+    esp_bt_gap_start_discovery(ESP_BT_INQ_MODE_GENERAL_INQUIRY, 10, 0);
+}
+
+void app_main(void)
+{
+    /* Initialize NVS — it is used to store PHY calibration data and save key-value pairs in flash memory*/
+    esp_err_t ret = nvs_flash_init();
+    if (ret == ESP_ERR_NVS_NO_FREE_PAGES || ret == ESP_ERR_NVS_NEW_VERSION_FOUND) {
+        ESP_ERROR_CHECK(nvs_flash_erase());
+        ret = nvs_flash_init();
+    }
+    ESP_ERROR_CHECK( ret );
+
+    /* initialize HCI TRANSPORT first */
+    hci_uart_open();
+    /* get HCI driver operations */
+    esp_bluedroid_hci_driver_operations_t operations = {
+        .send = hci_uart_send,
+        .check_send_available = hci_check_send_available,
+        .register_host_callback = hci_register_host_callback,
+    };
+    esp_bluedroid_attach_hci_driver(&operations);
+
+    esp_bluedroid_config_t bluedroid_cfg = BT_BLUEDROID_INIT_CONFIG_DEFAULT();
+    if ((ret = esp_bluedroid_init_with_cfg(&bluedroid_cfg)) != ESP_OK) {
+        ESP_LOGE(GAP_TAG, "%s initialize bluedroid failed: %s", __func__, esp_err_to_name(ret));
+        return;
+    }
+
+    if ((ret = esp_bluedroid_enable()) != ESP_OK) {
+        ESP_LOGE(GAP_TAG, "%s enable bluedroid failed: %s", __func__, esp_err_to_name(ret));
+        return;
+    }
+
+    bt_app_gap_start_up();
+}

examples/bluetooth/bluedroid/bluedroid_host_only/bluedroid_host_only_uart/main/uart_driver.c

@@ -0,0 +1,165 @@
+/*
+ * SPDX-FileCopyrightText: 2021-2023 Espressif Systems (Shanghai) CO LTD
+ *
+ * SPDX-License-Identifier: Unlicense OR CC0-1.0
+ */
+
+#include <stdio.h>
+#include <string.h>
+#include "freertos/FreeRTOS.h"
+#include "freertos/task.h"
+#include "freertos/queue.h"
+#include "driver/uart.h"
+#include "esp_log.h"
+#include "esp_attr.h"
+#include "esp_bluedroid_hci.h"
+#include "uart_driver.h"
+
+#define TAG "UART_HCI"
+
+#define UART_NO       (1)
+#define UART_BUF_SZ   (1024)
+
+#define UART_TX_PIN   (5)
+#define UART_RX_PIN   (18)
+#define UART_RTS_PIN  (19)
+#define UART_CTS_PIN  (23)
+
+enum {
+    UART_RX_TYPE = 0,
+    UART_RX_LEN,
+    UART_RX_DATA,
+};
+
+enum {
+    DATA_TYPE_COMMAND = 1,
+    DATA_TYPE_ACL     = 2,
+    DATA_TYPE_SCO     = 3,
+    DATA_TYPE_EVENT   = 4
+};
+
+TaskHandle_t s_rx_task_hdl;
+esp_bluedroid_hci_driver_callbacks_t s_callback = { 0 };
+
+static void IRAM_ATTR hci_uart_rx_task(void *arg)
+{
+    uint8_t buf[1026];
+    int len_now_read = -1;
+    uint32_t len_to_read = 1;
+    uint32_t len_total_read = 0;
+    uint8_t rx_st = UART_RX_TYPE;
+
+    while (1) {
+        len_now_read = uart_read_bytes(UART_NO, &buf[len_total_read], len_to_read, portMAX_DELAY);
+        assert(len_now_read == len_to_read);
+        len_total_read += len_now_read;
+
+        switch (rx_st) {
+        case UART_RX_TYPE: {
+            assert(buf[0] >= DATA_TYPE_ACL && buf[0] <= DATA_TYPE_EVENT);
+            if (buf[0] == DATA_TYPE_ACL) {
+                len_to_read = 4;
+            } else if (buf[0] == DATA_TYPE_SCO) {
+                len_to_read = 3;
+            } else if (buf[0] == DATA_TYPE_EVENT) {
+                len_to_read = 2;
+            } else {
+                assert(0);
+            }
+            rx_st = UART_RX_LEN;
+        }
+        break;
+
+        case UART_RX_LEN: {
+            if (buf[0] == DATA_TYPE_ACL) {
+                len_to_read = buf[3] | (buf[4] << 8);
+            } else if (buf[0] == DATA_TYPE_SCO) {
+                len_to_read = buf[3];
+            } else if (buf[0] == DATA_TYPE_EVENT) {
+                len_to_read = buf[2];
+            } else {
+                assert(0);
+            }
+            rx_st = UART_RX_DATA;
+        }
+        break;
+
+        case UART_RX_DATA: {
+            if (s_callback.notify_host_recv) {
+                s_callback.notify_host_recv(buf, len_total_read);
+            }
+
+            rx_st = UART_RX_TYPE;
+            len_to_read = 1;
+            len_total_read = 0;
+        }
+        break;
+
+        default: {
+            assert(0);
+            break;
+        }
+        }
+    }
+
+    vTaskDelete(NULL);
+}
+
+void hci_uart_send(uint8_t *buf, uint16_t len)
+{
+    uint8_t *p = buf;
+    int len_write = 0;
+
+    while (len) {
+        len_write = uart_write_bytes(UART_NO, p, len);
+        assert(len_write > 0);
+        len -= len_write;
+        p += len_write;
+    }
+}
+
+bool hci_check_send_available(void)
+{
+    return true;
+}
+
+esp_err_t hci_register_host_callback(const esp_bluedroid_hci_driver_callbacks_t *callback)
+{
+    s_callback.notify_host_send_available = callback->notify_host_send_available;
+    s_callback.notify_host_recv = callback->notify_host_recv;
+
+    return ESP_OK;
+}
+
+void hci_uart_open(void)
+{
+    uart_config_t uart_config = {
+        .baud_rate  = CONFIG_EXAMPLE_HCI_UART_BAUDRATE,
+        .data_bits  = UART_DATA_8_BITS,
+        .parity     = UART_PARITY_DISABLE,
+        .stop_bits  = UART_STOP_BITS_1,
+        .flow_ctrl  = UART_HW_FLOWCTRL_CTS_RTS,
+        .source_clk = UART_SCLK_DEFAULT,
+        .rx_flow_ctrl_thresh = UART_HW_FIFO_LEN(UART_NO) - 1,
+    };
+
+    int intr_alloc_flags = 0;
+#if CONFIG_UART_ISR_IN_IRAM
+    intr_alloc_flags = ESP_INTR_FLAG_IRAM;
+#endif
+
+    ESP_ERROR_CHECK(uart_driver_install(UART_NO, UART_BUF_SZ * 2, UART_BUF_SZ * 2, 0, NULL, intr_alloc_flags));
+    ESP_ERROR_CHECK(uart_param_config(UART_NO, &uart_config));
+    ESP_ERROR_CHECK(uart_set_pin(UART_NO, UART_TX_PIN, UART_RX_PIN, UART_RTS_PIN, UART_CTS_PIN));
+
+    xTaskCreate(hci_uart_rx_task, "hci_uart_rx_task", 2048, NULL, 12, &s_rx_task_hdl);
+}
+
+void hci_uart_close(void)
+{
+    if (s_rx_task_hdl) {
+        vTaskDelete(s_rx_task_hdl);
+    }
+    uart_driver_delete(UART_NO);
+    memset(&s_callback, 0, sizeof(esp_bluedroid_hci_driver_callbacks_t));
+}

examples/bluetooth/bluedroid/bluedroid_host_only/bluedroid_host_only_uart/main/uart_driver.h

@@ -0,0 +1,46 @@
+/*
+ * SPDX-FileCopyrightText: 2021-2023 Espressif Systems (Shanghai) CO LTD
+ *
+ * SPDX-License-Identifier: Unlicense OR CC0-1.0
+ */
+
+#ifndef __UART_DRIVER_H__
+#define __UART_DRIVER_H__
+
+#include <stdint.h>
+#include <stdbool.h>
+#include "esp_bluedroid_hci.h"
+
+/**
+ * @brief open HCI transport of uart
+ */
+void hci_uart_open(void);
+
+/**
+ * @brief close HCI transport of uart
+ */
+void hci_uart_close(void);
+
+/**
+ * @brief send data from host to HCI transport
+ *
+ * @param[in] data  pointer to data buffer
+ * @param[in] len   length of data
+ */
+void hci_uart_send(uint8_t *data, uint16_t len);
+
+/**
+ * @brief host checks whether it can send data to HCI transport
+ *
+ * @return true if host can send data, false otherwise
+ */
+bool hci_check_send_available(void);
+
+/**
+ * @brief register host callbacks
+ *
+ * @param[in] callback  HCI driver callbacks
+ */
+esp_err_t hci_register_host_callback(const esp_bluedroid_hci_driver_callbacks_t *callback);
+
+#endif /* __UART_DRIVER_H__ */

examples/bluetooth/bluedroid/bluedroid_host_only/bluedroid_host_only_uart/sdkconfig.defaults

@@ -0,0 +1,4 @@
+CONFIG_BT_CONTROLLER_DISABLED=y
+CONFIG_BT_ENABLED=y
+CONFIG_BT_BLUEDROID_ENABLED=y
+CONFIG_BT_CLASSIC_ENABLED=y