Merge branch 'feature/btdm_controller' into 'master'

BT support

Initial version of BT support.

BT and WiFi are mutually exclusive at this point, so we have a new option to select which stack is used.
Precompiled BT libraries are added as a submodule.


See merge request !109
This commit is contained in:
Wu Jian Gang 2016-09-23 15:26:47 +08:00
commit 4480ab6c8c
15 changed files with 530 additions and 53 deletions

3
.gitmodules vendored
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@ -4,3 +4,6 @@
[submodule "components/esptool_py/esptool"]
path = components/esptool_py/esptool
url = https://github.com/themadinventor/esptool.git
[submodule "components/bt/lib"]
path = components/bt/lib
url = https://github.com/espressif/esp32-bt-lib.git

32
Kconfig
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@ -19,38 +19,6 @@ config PYTHON
help
The executable name/path that is used to run python. On some systems Python 2.x
may need to be invoked as python2.
config MEMMAP_BT
bool "Reserve space for Bluetooth stack"
default "n"
help
The Bluetooth stack uses memory that cannot be used as generic memory anymore. This
reserves the space for that within the memory map of the compiled binary.
config MEMMAP_SMP
bool "Reserve memory for two cores"
default "y"
help
The ESP32 contains two cores. If you plan to only use one, you can disable this item
to save some memory. (ToDo: Make this automatically depend on unicore support)
config MEMMAP_TRACEMEM
bool "Use TRAX tracing feature"
default "n"
help
The ESP32 contains a feature which allows you to trace the execution path the processor
has taken through the program. This is stored in a chunk of 32K (16K for single-processor)
of memory that can't be used for general purposes anymore. Disable this if you do not know
what this is.
config MEMMAP_SPISRAM
bool "Use external SPI SRAM chip as main memory"
default "n"
help
The ESP32 can control an external SPI SRAM chip, adding the memory it contains to the
main memory map. Enable this if you have this hardware and want to use it in the same
way as on-chip RAM.
endmenu
source "$COMPONENT_KCONFIGS_PROJBUILD"

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@ -3,21 +3,21 @@ visible if MEMMAP_BT
config BT_ENABLED
bool "Enable low-level BT stack"
depends on MEMMAP_BT
bool
depends on ESP32_ENABLE_STACK_BT
help
This compiles in the low-level BT stack.
config BT_BTLE
bool "Enable BTLE"
depends on BT_ENABLED
help
This compiles BTLE support
config BT_BT
bool "Enable classic BT"
depends on BT_ENABLED
help
This enables classic BT support
#config BT_BTLE
# bool "Enable BTLE"
# depends on BT_ENABLED
# help
# This compiles BTLE support
#
#config BT_BT
# bool "Enable classic BT"
# depends on BT_ENABLED
# help
# This enables classic BT support
endmenu

121
components/bt/bt.c Normal file
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@ -0,0 +1,121 @@
// 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 <stddef.h>
#include <stdlib.h>
#include <stdio.h>
#include "freertos/FreeRTOS.h"
#include "freertos/task.h"
#include "freertos/queue.h"
#include "freertos/semphr.h"
#include "freertos/xtensa_api.h"
#include "freertos/portmacro.h"
#include "esp_types.h"
#include "esp_system.h"
#include "esp_task.h"
#include "esp_intr.h"
#include "esp_attr.h"
#include "bt.h"
#if CONFIG_BT_ENABLED
/* not for user call, so don't put to include file */
extern void btdm_osi_funcs_register(void *osi_funcs);
extern void btdm_controller_init(void);
static bt_app_startup_cb_t app_startup_cb;
static void *app_startup_ctx;
#define BT_DEBUG(...)
#define BT_API_CALL_CHECK(info, api_call, ret) \
do{\
esp_err_t __err = (api_call);\
if ((ret) != __err) {\
BT_DEBUG("%s %d %s ret=%d\n", __FUNCTION__, __LINE__, (info), __err);\
return __err;\
}\
} while(0)
struct osi_funcs_t {
xt_handler (*_set_isr)(int n, xt_handler f, void *arg);
void (*_ints_on)(unsigned int mask);
void (*_interrupt_disable)(void);
void (*_interrupt_restore)(void);
void (*_task_yield)(void);
void *(*_semphr_create)(uint32_t max, uint32_t init);
void *(*_semphr_give_from_isr)(void *semphr, void *hptw);
void *(*_semphr_take)(void *semphr, uint32_t block_time);
esp_err_t (* _read_efuse_mac)(uint8_t mac[6]);
};
static portMUX_TYPE global_int_mux = portMUX_INITIALIZER_UNLOCKED;
static void IRAM_ATTR interrupt_disable(void)
{
portENTER_CRITICAL(&global_int_mux);
}
static void IRAM_ATTR interrupt_restore(void)
{
portEXIT_CRITICAL(&global_int_mux);
}
static void * IRAM_ATTR semphr_take_wrapper(void *semphr, uint32_t block_time)
{
return (void *)xSemaphoreTake(semphr, block_time);
}
static struct osi_funcs_t osi_funcs = {
._set_isr = xt_set_interrupt_handler,
._ints_on = xt_ints_on,
._interrupt_disable = interrupt_disable,
._interrupt_restore = interrupt_restore,
._task_yield = vPortYield,
._semphr_create = xQueueCreateCountingSemaphore,
._semphr_give_from_isr = (void *)xQueueGiveFromISR,
._semphr_take = semphr_take_wrapper,
._read_efuse_mac = system_efuse_read_mac,
};
static void bt_controller_task(void *pvParam)
{
btdm_osi_funcs_register(&osi_funcs);
btdm_controller_init();
}
static void bt_init_task(void *pvParameters)
{
xTaskCreatePinnedToCore(bt_controller_task, "btControllerTask", ESP_TASK_BT_CONTROLLER_STACK, NULL, ESP_TASK_BT_CONTROLLER_PRIO, NULL, 0);
if (app_startup_cb) {
app_startup_cb(app_startup_ctx);
}
vTaskDelete(NULL);
}
esp_err_t esp_bt_startup(bt_app_startup_cb_t cb, void *ctx)
{
app_startup_cb = cb;
app_startup_ctx = ctx;
xTaskCreatePinnedToCore(bt_init_task, "btInitTask", ESP_TASK_BT_INIT_STACK, NULL, ESP_TASK_BT_INIT_PRIO, NULL, 0);
return ESP_OK;
}
#endif

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@ -0,0 +1,25 @@
#
# Component Makefile
#
#COMPONENT_ADD_INCLUDEDIRS :=
CURRENT_DIR=$(IDF_PATH)/components/bt
COMPONENT_ADD_INCLUDEDIRS := ./include
CFLAGS += -Wno-error=unused-label -Wno-error=return-type -Wno-error=missing-braces -Wno-error=pointer-sign -Wno-error=parentheses
LIBS := btdm_app
COMPONENT_ADD_LDFLAGS := -lbt -L$(abspath lib) \
$(addprefix -l,$(LIBS)) \
$(LINKER_SCRIPTS)
ALL_LIB_FILES := $(patsubst %,$(COMPONENT_PATH)/lib/lib%.a,$(LIBS))
$(COMPONENT_LIBRARY): $(ALL_LIB_FILES)
COMPONENT_SRCDIRS := ./
include $(IDF_PATH)/make/component_common.mk

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@ -0,0 +1,66 @@
// 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 __BT_H__
#define __BT_H__
#include "freertos/FreeRTOS.h"
#include "esp_err.h"
#ifdef __cplusplus
extern "C" {
#endif
typedef void (* bt_app_startup_cb_t)(void *param);
esp_err_t esp_bt_startup(bt_app_startup_cb_t cb, void *ctx);
/* @breif: vhci_host_callback
* used for vhci call host function to notify what host need to do
*
* notify_host_send_available: notify host can send packet to controller
* notify_host_recv: notify host that controller has packet send to host
*/
typedef struct vhci_host_callback {
void (*notify_host_send_available)(void);
int (*notify_host_recv)(uint8_t *data, uint16_t len);
} vhci_host_callback_t;
/* @breif: API_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 API_vhci_host_check_send_available(void);
/* @breif: API_vhci_host_send_packet
* host send packet to controller
* param data is the packet point, the param len is the packet length
* return void
*/
void API_vhci_host_send_packet(uint8_t *data, uint16_t len);
/* @breif: API_vhci_host_register_callback
* register the vhci referece callback, the call back
* struct defined by vhci_host_callback structure.
* param is the vhci_host_callback type variable
*/
void API_vhci_host_register_callback(const vhci_host_callback_t *callback);
#ifdef __cplusplus
}
#endif
#endif /* __BT_H__ */

1
components/bt/lib Submodule

@ -0,0 +1 @@
Subproject commit 6c9a6de656262113a0aab63907d6871a64e00fae

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@ -20,13 +20,65 @@ config ESP32_DEFAULT_CPU_FREQ_MHZ
default 160 if ESP32_DEFAULT_CPU_FREQ_160
default 240 if ESP32_DEFAULT_CPU_FREQ_240
config WIFI_ENABLED
bool "Enable low-level WiFi stack"
choice ESP32_WIFI_OR_BT
prompt "Select stack to enable (WiFi or BT)"
default ESP32_ENABLE_WIFI
help
Temporarily, WiFi and BT stacks can not be used at the same time.
Select which stack to enable.
config ESP32_ENABLE_STACK_WIFI
bool "WiFi"
select WIFI_ENABLED if ESP32_ENABLE_STACK_WIFI
config ESP32_ENABLE_STACK_BT
bool "BT"
select MEMMAP_BT if ESP32_ENABLE_STACK_BT
select BT_ENABLED if ESP32_ENABLE_STACK_BT
config ESP32_ENABLE_STACK_NONE
bool "None"
endchoice
config MEMMAP_BT
bool
depends on ESP32_ENABLE_STACK_BT
help
The Bluetooth stack uses memory that cannot be used as generic memory anymore. This
reserves the space for that within the memory map of the compiled binary.
This option is required to enable BT stack.
Temporarily, this option is not compatible with WiFi stack.
config MEMMAP_SMP
bool "Reserve memory for two cores"
default "y"
help
The ESP32 contains two cores. If you plan to only use one, you can disable this item
to save some memory. (ToDo: Make this automatically depend on unicore support)
config MEMMAP_TRACEMEM
bool "Use TRAX tracing feature"
default "n"
help
The ESP32 contains a feature which allows you to trace the execution path the processor
has taken through the program. This is stored in a chunk of 32K (16K for single-processor)
of memory that can't be used for general purposes anymore. Disable this if you do not know
what this is.
config MEMMAP_SPISRAM
bool "Use external SPI SRAM chip as main memory"
default "n"
help
The ESP32 can control an external SPI SRAM chip, adding the memory it contains to the
main memory map. Enable this if you have this hardware and want to use it in the same
way as on-chip RAM.
config WIFI_ENABLED
bool
default "y"
depends on ESP32_ENABLE_STACK_WIFI
help
This compiles in the low-level WiFi stack.
Temporarily, this option requires that FreeRTOS runs in single core mode.
Temporarily, this option is not compatible with BT stack.
config WIFI_AUTO_STARTUP
bool "Start WiFi with system startup"

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@ -48,6 +48,9 @@ static void IRAM_ATTR call_user_start_cpu1();
static void IRAM_ATTR user_start_cpu1(void);
extern void ets_setup_syscalls(void);
extern esp_err_t app_main(void *ctx);
#if CONFIG_BT_ENABLED
extern void bt_app_main(void *param);
#endif
extern int _bss_start;
extern int _bss_end;
@ -161,7 +164,10 @@ void user_start_cpu0(void)
#if CONFIG_WIFI_ENABLED && CONFIG_WIFI_AUTO_STARTUP
#include "esp_wifi.h"
esp_wifi_startup(app_main, NULL);
esp_wifi_startup(app_main, NULL);
#elif CONFIG_BT_ENABLED
#include "bt.h"
esp_bt_startup(bt_app_main, NULL);
#else
app_main(NULL);
#endif

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@ -43,6 +43,11 @@
#define ESP_TASK_WPS_PRIO (ESP_TASK_PRIO_MIN + 2)
#define ESP_TASK_WPS_STACK 2048
/* Bt contoller Task */
/* controller */
#define ESP_TASK_BT_CONTROLLER_PRIO (ESP_TASK_PRIO_MAX - 1)
#define ESP_TASK_BT_CONTROLLER_STACK 4096
/* idf task */
#define ESP_TASKD_EVENT_PRIO (ESP_TASK_PRIO_MAX - 5)
#define ESP_TASKD_EVENT_STACK CONFIG_SYSTEM_EVENT_TASK_STACK_SIZE
@ -50,5 +55,6 @@
#define ESP_TASK_WIFI_STARTUP_STACK 4096
#define ESP_TASK_TCPIP_PRIO (ESP_TASK_PRIO_MAX - 7)
#define ESP_TASK_TCPIP_STACK 2048
#define ESP_TASK_BT_INIT_PRIO (ESP_TASK_PRIO_MAX - 7)
#define ESP_TASK_BT_INIT_STACK 2048
#endif

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@ -260,14 +260,14 @@
/*************************************************************************************************************
* Intr num Level Type PRO CPU usage APP CPU uasge
* 0 1 extern level WMAC Reserved
* 1 1 extern level BT/BLE Host Reserved
* 1 1 extern level BT/BLE Host VHCI Reserved
* 2 1 extern level FROM_CPU FROM_CPU
* 3 1 extern level TG0_WDT Reserved
* 4 1 extern level WBB
* 5 1 extern level Reserved
* 5 1 extern level BT Controller
* 6 1 timer FreeRTOS Tick(L1) FreeRTOS Tick(L1)
* 7 1 software Reserved Reserved
* 8 1 extern level Reserved
* 8 1 extern level BLE Controller
* 9 1 extern level
* 10 1 extern edge Internal Timer
* 11 3 profiling

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@ -0,0 +1,9 @@
#
# This is a project Makefile. It is assumed the directory this Makefile resides in is a
# project subdirectory.
#
PROJECT_NAME := ble_adv
include $(IDF_PATH)/make/project.mk

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@ -0,0 +1,6 @@
ESP-IDF ble_advertising app
====================
This is a BLE advertising demo with virtual HCI interface. Send Reset/ADV_PARAM/ADV_DATA/ADV_ENABLE HCI command for BLE advertising.

204
examples/04_ble_adv/main/app_bt.c Executable file
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@ -0,0 +1,204 @@
#include <stdio.h>
#include "freertos/FreeRTOS.h"
#include "freertos/task.h"
#include "bt.h"
#include <string.h>
#define HCI_H4_CMD_PREAMBLE_SIZE (4)
/* HCI Command opcode group field(OGF) */
#define HCI_GRP_HOST_CONT_BASEBAND_CMDS (0x03 << 10) /* 0x0C00 */
#define HCI_GRP_BLE_CMDS (0x08 << 10)
#define HCI_RESET (0x0003 | HCI_GRP_HOST_CONT_BASEBAND_CMDS)
#define HCI_BLE_WRITE_ADV_ENABLE (0x000A | HCI_GRP_BLE_CMDS)
#define HCI_BLE_WRITE_ADV_PARAMS (0x0006 | HCI_GRP_BLE_CMDS)
#define HCI_BLE_WRITE_ADV_DATA (0x0008 | HCI_GRP_BLE_CMDS)
#define HCIC_PARAM_SIZE_WRITE_ADV_ENABLE (1)
#define HCIC_PARAM_SIZE_BLE_WRITE_ADV_PARAMS (15)
#define HCIC_PARAM_SIZE_BLE_WRITE_ADV_DATA (31)
#define BD_ADDR_LEN (6) /* Device address length */
typedef uint8_t bd_addr_t[BD_ADDR_LEN]; /* Device address */
#define UINT16_TO_STREAM(p, u16) {*(p)++ = (uint8_t)(u16); *(p)++ = (uint8_t)((u16) >> 8);}
#define UINT8_TO_STREAM(p, u8) {*(p)++ = (uint8_t)(u8);}
#define BDADDR_TO_STREAM(p, a) {int ijk; for (ijk = 0; ijk < BD_ADDR_LEN; ijk++) *(p)++ = (uint8_t) a[BD_ADDR_LEN - 1 - ijk];}
#define ARRAY_TO_STREAM(p, a, len) {int ijk; for (ijk = 0; ijk < len; ijk++) *(p)++ = (uint8_t) a[ijk];}
enum {
H4_TYPE_COMMAND = 1,
H4_TYPE_ACL = 2,
H4_TYPE_SCO = 3,
H4_TYPE_EVENT = 4
};
static uint8_t hci_cmd_buf[128];
/*
* @brief: BT controller callback function, used to notify the upper layer that
* controller is ready to receive command
*/
static void controller_rcv_pkt_ready(void)
{
printf("controller rcv pkt ready\n");
}
/*
* @brief: BT controller callback function, to transfer data packet to upper
* controller is ready to receive command
*/
static int host_rcv_pkt(uint8_t *data, uint16_t len)
{
printf("host rcv pkt: ");
for (uint16_t i=0; i<len; i++)
printf("%02x", data[i]);
printf("\n");
return 0;
}
static vhci_host_callback_t vhci_host_cb = {
controller_rcv_pkt_ready,
host_rcv_pkt
};
static uint16_t make_cmd_reset(uint8_t *buf)
{
UINT8_TO_STREAM (buf, H4_TYPE_COMMAND);
UINT16_TO_STREAM (buf, HCI_RESET);
UINT8_TO_STREAM (buf, 0);
return HCI_H4_CMD_PREAMBLE_SIZE;
}
static uint16_t make_cmd_ble_set_adv_enable (uint8_t *buf, uint8_t adv_enable)
{
UINT8_TO_STREAM (buf, H4_TYPE_COMMAND);
UINT16_TO_STREAM (buf, HCI_BLE_WRITE_ADV_ENABLE);
UINT8_TO_STREAM (buf, HCIC_PARAM_SIZE_WRITE_ADV_ENABLE);
UINT8_TO_STREAM (buf, adv_enable);
return HCI_H4_CMD_PREAMBLE_SIZE + HCIC_PARAM_SIZE_WRITE_ADV_ENABLE;
}
static uint16_t make_cmd_ble_set_adv_param (uint8_t *buf, uint16_t adv_int_min, uint16_t adv_int_max,
uint8_t adv_type, uint8_t addr_type_own,
uint8_t addr_type_dir, bd_addr_t direct_bda,
uint8_t channel_map, uint8_t adv_filter_policy)
{
UINT8_TO_STREAM (buf, H4_TYPE_COMMAND);
UINT16_TO_STREAM (buf, HCI_BLE_WRITE_ADV_PARAMS);
UINT8_TO_STREAM (buf, HCIC_PARAM_SIZE_BLE_WRITE_ADV_PARAMS );
UINT16_TO_STREAM (buf, adv_int_min);
UINT16_TO_STREAM (buf, adv_int_max);
UINT8_TO_STREAM (buf, adv_type);
UINT8_TO_STREAM (buf, addr_type_own);
UINT8_TO_STREAM (buf, addr_type_dir);
BDADDR_TO_STREAM (buf, direct_bda);
UINT8_TO_STREAM (buf, channel_map);
UINT8_TO_STREAM (buf, adv_filter_policy);
return HCI_H4_CMD_PREAMBLE_SIZE + HCIC_PARAM_SIZE_BLE_WRITE_ADV_PARAMS;
}
static uint16_t make_cmd_ble_set_adv_data(uint8_t *buf, uint8_t data_len, uint8_t *p_data)
{
UINT8_TO_STREAM (buf, H4_TYPE_COMMAND);
UINT16_TO_STREAM (buf, HCI_BLE_WRITE_ADV_DATA);
UINT8_TO_STREAM (buf, HCIC_PARAM_SIZE_BLE_WRITE_ADV_DATA + 1);
memset(buf, 0, HCIC_PARAM_SIZE_BLE_WRITE_ADV_DATA);
if (p_data != NULL && data_len > 0) {
if (data_len > HCIC_PARAM_SIZE_BLE_WRITE_ADV_DATA) {
data_len = HCIC_PARAM_SIZE_BLE_WRITE_ADV_DATA;
}
UINT8_TO_STREAM (buf, data_len);
ARRAY_TO_STREAM (buf, p_data, data_len);
}
return HCI_H4_CMD_PREAMBLE_SIZE + HCIC_PARAM_SIZE_BLE_WRITE_ADV_DATA + 1;
}
static void hci_cmd_send_reset(void)
{
uint16_t sz = make_cmd_reset (hci_cmd_buf);
API_vhci_host_send_packet(hci_cmd_buf, sz);
}
static void hci_cmd_send_ble_adv_start(void)
{
uint16_t sz = make_cmd_ble_set_adv_enable (hci_cmd_buf, 1);
API_vhci_host_send_packet(hci_cmd_buf, sz);
}
static void hci_cmd_send_ble_set_adv_param(void)
{
uint16_t adv_intv_min = 256; // 160ms
uint16_t adv_intv_max = 256; // 160ms
uint8_t adv_type = 0; // connectable undirected advertising (ADV_IND)
uint8_t own_addr_type = 0; // Public Device Address
uint8_t peer_addr_type = 0; // Public Device Address
uint8_t peer_addr[6] = {0x80, 0x81, 0x82, 0x83, 0x84, 0x85};
uint8_t adv_chn_map = 0x07; // 37, 38, 39
uint8_t adv_filter_policy = 0; // Process All Conn and Scan
uint16_t sz = make_cmd_ble_set_adv_param(hci_cmd_buf,
adv_intv_min,
adv_intv_max,
adv_type,
own_addr_type,
peer_addr_type,
peer_addr,
adv_chn_map,
adv_filter_policy);
API_vhci_host_send_packet(hci_cmd_buf, sz);
}
static void hci_cmd_send_ble_set_adv_data(void)
{
char *adv_name = "ESP-BLE-HELLO";
uint8_t name_len = (uint8_t)strlen(adv_name);
uint8_t adv_data[31] = {0x02, 0x01, 0x06, 0x0, 0x09};
uint8_t adv_data_len;
adv_data[3] = name_len + 1;
for (int i=0; i<name_len; i++) {
adv_data[5+i] = (uint8_t)adv_name[i];
}
adv_data_len = 5 + name_len;
uint16_t sz = make_cmd_ble_set_adv_data(hci_cmd_buf, adv_data_len, (uint8_t *)adv_data);
API_vhci_host_send_packet(hci_cmd_buf, sz);
}
/*
* @brief: send HCI commands to perform BLE advertising;
*/
void bleAdvtTask(void *pvParameters)
{
int cmd_cnt = 0;
bool send_avail = false;
API_vhci_host_register_callback(&vhci_host_cb);
printf("BLE advt task start\n");
while (1) {
vTaskDelay(1000 / portTICK_PERIOD_MS);
send_avail = API_vhci_host_check_send_available();
if (send_avail) {
switch (cmd_cnt) {
case 0: hci_cmd_send_reset(); ++cmd_cnt; break;
case 1: hci_cmd_send_ble_set_adv_param(); ++cmd_cnt; break;
case 2: hci_cmd_send_ble_set_adv_data(); ++cmd_cnt; break;
case 3: hci_cmd_send_ble_adv_start(); ++cmd_cnt; break;
}
}
printf("BLE Advertise, flag_send_avail: %d, cmd_sent: %d\n", send_avail, cmd_cnt);
}
}
void bt_app_main()
{
xTaskCreatePinnedToCore(&bleAdvtTask, "bleAdvtTask", 2048, NULL, 5, NULL, 0);
}

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@ -0,0 +1,10 @@
#
# Main Makefile. This is basically the same as a component makefile.
#
# This Makefile should, at the very least, just include $(SDK_PATH)/make/component_common.mk. By default,
# this will take the sources in the src/ directory, compile them and link them into
# lib(subdirectory_name).a in the build directory. This behaviour is entirely configurable,
# please read the ESP-IDF documents if you need to do this.
#
include $(IDF_PATH)/make/component_common.mk