Add nimble hci example for c2

examples/bluetooth/nimble/hci/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 3.5)
+
+include($ENV{IDF_PATH}/tools/cmake/project.cmake)
+project(hci)

examples/bluetooth/nimble/hci/README.md

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+| Supported Targets | ESP32-C2 |
+| ----------------- | -------- |
+
+
+ESP-IDF UART HCI Controller
+===========================
+
+This is a BLE controller use UART as HCI interface. 
+
+It can do the configuration of UART number and UART baudrate by menuconfig.
+
+## BLE HCI example
+
+(See the README.md file in the upper level 'examples' directory for more information about examples.)
+
+This example start controller with uart hci.
+
+It uses ESP32C2's Bluetooth controller.
+
+In this example, two UARTs are used:
+
+- UART0 is used as normal output or by IDF monitor
+
+- UART1 is used to convey HCI messages
+
+Pins 8, 9 are used as TxD, RxD PINs of UART1.
+
+
+## How to use example
+
+### Configure the project
+
+```
+idf.py menuconfig
+```
+
+
+### 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
+```
+
+(To exit the serial monitor, type ``Ctrl-]``.)
+
+See the Getting Started Guide for full steps to configure and use ESP-IDF to build projects.
+
+## Example Output
+
+There is this console output when bleprph is connected and characteristic is read:
+
+```
+set nimble port tx:8, rx:9.
+set baud:115200.
+controller lib commit: [fb738d4]
+controller rom commit: [3314f9d]
+I (346) system_api: Base MAC address is not set
+I (356) system_api: read default base MAC address from EFUSE
+
+```
+

examples/bluetooth/nimble/hci/main/CMakeLists.txt

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+set(srcs "main.c")
+
+idf_component_register(SRCS "${srcs}"
+                    INCLUDE_DIRS ".")

examples/bluetooth/nimble/hci/main/component.mk

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+#
+# "main" pseudo-component makefile.
+#
+# (Uses default behaviour of compiling all source files in directory, adding 'include' to include path.)

examples/bluetooth/nimble/hci/main/main.c

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+/*
+ * SPDX-FileCopyrightText: 2015-2022 Espressif Systems (Shanghai) CO LTD
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#include "esp_log.h"
+#include "nvs_flash.h"
+
+#include "esp_bt.h"
+
+#ifndef CONFIG_BT_LE_HCI_INTERFACE_USE_UART
+#error "Please Enable Uart for HCI"
+#endif
+
+#define TAG "BLE_HCI"
+
+void
+app_main(void)
+{
+    esp_err_t ret;
+    /* Initialize NVS — it is used to store PHY calibration data */
+    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);
+
+    esp_bt_controller_config_t config_opts = BT_CONTROLLER_INIT_CONFIG_DEFAULT();
+
+    /*
+     *  Initialize Bluetooth Controller parameters.
+     */
+    ESP_ERROR_CHECK(esp_bt_controller_init(&config_opts));
+
+    /*
+     * Enable the task stack of the Bluetooth Controller.
+     */
+    ESP_ERROR_CHECK(esp_bt_controller_enable(ESP_BT_MODE_BLE));
+
+
+}

examples/bluetooth/nimble/hci/sdkconfig.defaults

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+# This file was generated using idf.py save-defconfig. It can be edited manually.
+# Espressif IoT Development Framework (ESP-IDF) Project Minimal Configuration
+#
+CONFIG_BT_ENABLED=y
+CONFIG_BT_CONTROLLER_ONLY=y
+CONFIG_BT_LE_HCI_INTERFACE_USE_UART=y
+CONFIG_BT_LE_HCI_UART_TX_PIN=8
+CONFIG_BT_LE_HCI_UART_RX_PIN=9
+CONFIG_BT_LE_HCI_UART_BAUD=115200