component/bt : add uart(1/2) as HCI IO directly

examples/bluetooth/controller_hci_uart/Makefile

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+#
+# This is a project Makefile. It is assumed the directory this Makefile resides in is a
+# project subdirectory.
+#
+
+PROJECT_NAME := controller_hci_uart
+
+include $(IDF_PATH)/make/project.mk

examples/bluetooth/controller_hci_uart/README.rst

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+ESP-IDF UART HCI Controller
+===========================
+
+This is a btdm controller use UART as HCI IO. This require the UART device support RTS/CTS mandatory.
+It can do the configuration of UART number and UART baudrate by menuconfig.
+
+

examples/bluetooth/controller_hci_uart/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/controller_hci_uart/main/main.c

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+// 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.
+
+#include <stdio.h>
+#include <string.h>
+
+#include "bt.h"
+#include "driver/uart.h"
+#include "esp_log.h"
+
+static const char *tag = "CONTROLLER_UART_HCI";
+
+static void uart_gpio_reset(void)
+{
+    ESP_LOGI(tag, "HCI UART Pin select: TX 5, RX, 18, CTS 23, RTS 19\n");
+
+#if CONFIG_HCI_UART_NO
+    uart_set_pin(CONFIG_HCI_UART_NO, 5, 18, 19, 23);
+#endif
+}
+
+void app_main()
+{ 
+    /* As the UART1/2 pin conflict with flash pin, so do matrix of the signal and pin */
+    uart_gpio_reset();
+ 
+    esp_bt_controller_init();
+
+    if (esp_bt_controller_enable(ESP_BT_MODE_BTDM) != ESP_OK) {
+        return;
+    }
+}
+

examples/bluetooth/controller_hci_uart/sdkconfig.defaults

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+# Override some defaults so BT stack is enabled
+# in this example
+
+#
+# BT config
+#
+CONFIG_BT_ENABLED=y
+CONFIG_HCI_UART=y
+CONFIG_HCI_UART_NO=1
+CONFIG_HCI_UART_BAUDRATE=921600