zephyr: west supporting out-of-tree build

2025-03-14 01:27:41 +00:00 · 2023-06-14 10:17:15 +02:00 · 2023-06-14 10:17:15 +02:00 · 277e512c6e
commit 277e512c6e
parent e406aa8dcd
8 changed files with 645 additions and 0 deletions
--- a/port/zephyr/.gitignore
+++ b/port/zephyr/.gitignore
@ -0,0 +1 @@
+build
--- a/port/zephyr/CMakeLists.txt
+++ b/port/zephyr/CMakeLists.txt
@ -0,0 +1,213 @@
+cmake_minimum_required (VERSION 3.5)
+
+SET(CMAKE_OSX_SYSROOT /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk)
+SET(CMAKE_EXPORT_COMPILE_COMMANDS ON)
+
+#set(CMAKE_BUILD_TYPE RelWithDebInfo)
+
+find_package(Zephyr REQUIRED HINTS $ENV{ZEPHYR_BASE})
+
+project(BTstack-Zephyr)
+
+set(BTSTACK_ROOT ${CMAKE_SOURCE_DIR}/../../)
+if( DEFINED ENV{BTSTACK_ROOT} )
+    set(BTSTACK_ROOT $ENV{BTSTACK_ROOT})
+endif()
+
+# pkgconfig
+find_package(PkgConfig REQUIRED)
+
+# to generate .h from .gatt files
+find_package (Python REQUIRED COMPONENTS Interpreter)
+include_directories(${CMAKE_CURRENT_BINARY_DIR})
+
+# local dir for btstack_config.h after build dir to avoid using .h from Makefile
+set(INCLUDES_PATH "" )
+list(APPEND INCLUDES_PATH 3rd-party/micro-ecc )
+list(APPEND INCLUDES_PATH 3rd-party/bluedroid/decoder/include)
+list(APPEND INCLUDES_PATH 3rd-party/bluedroid/encoder/include)
+list(APPEND INCLUDES_PATH 3rd-party/lc3-google/include)
+list(APPEND INCLUDES_PATH 3rd-party/md5)
+list(APPEND INCLUDES_PATH 3rd-party/hxcmod-player)
+list(APPEND INCLUDES_PATH 3rd-party/hxcmod-player/mod)
+list(APPEND INCLUDES_PATH 3rd-party/lwip/core/src/include)
+list(APPEND INCLUDES_PATH 3rd-party/lwip/dhcp-server)
+list(APPEND INCLUDES_PATH 3rd-party/rijndael)
+list(APPEND INCLUDES_PATH 3rd-party/yxml)
+list(APPEND INCLUDES_PATH 3rd-party/tinydir)
+list(APPEND INCLUDES_PATH src)
+#list(APPEND INCLUDES_PATH chipset/realtek)
+#list(APPEND INCLUDES_PATH chipset/zephyr)
+#list(APPEND INCLUDES_PATH platform/posix)
+list(APPEND INCLUDES_PATH platform/embedded)
+list(APPEND INCLUDES_PATH platform/lwip)
+list(APPEND INCLUDES_PATH platform/lwip/port)
+list(TRANSFORM INCLUDES_PATH PREPEND ${BTSTACK_ROOT}/)
+list(APPEND INCLUDES_PATH . )
+include_directories( ${INCLUDES_PATH} )
+
+file(GLOB SOURCES_SRC       "${BTSTACK_ROOT}/src/*.c" ) #"${BTSTACK_ROOT}/example/sco_demo_util.c")
+
+#message("${SOURCES_SRC}")
+
+file(GLOB SOURCES_BLE       "${BTSTACK_ROOT}/src/ble/*.c")
+file(GLOB SOURCES_GATT      "${BTSTACK_ROOT}/src/ble/gatt-service/*.c")
+file(GLOB SOURCES_CLASSIC   "${BTSTACK_ROOT}/src/classic/*.c")
+file(GLOB SOURCES_MESH      "${BTSTACK_ROOT}/src/mesh/*.c" "${BTSTACK_ROOT}/src/mesh/gatt-service/*.c")
+file(GLOB SOURCES_BLUEDROID "${BTSTACK_ROOT}/3rd-party/bluedroid/encoder/srce/*.c" "${BTSTACK_ROOT}/3rd-party/bluedroid/decoder/srce/*.c")
+file(GLOB SOURCES_MD5       "${BTSTACK_ROOT}/3rd-party/md5/md5.c")
+file(GLOB SOURCES_UECC      "${BTSTACK_ROOT}/3rd-party/micro-ecc/uECC.c")
+file(GLOB SOURCES_YXML      "${BTSTACK_ROOT}/3rd-party/yxml/yxml.c")
+file(GLOB SOURCES_HXCMOD    "${BTSTACK_ROOT}/3rd-party/hxcmod-player/*.c"  "../../3rd-party/hxcmod-player/mods/*.c")
+file(GLOB SOURCES_RIJNDAEL  "${BTSTACK_ROOT}/3rd-party/rijndael/rijndael.c")
+file(GLOB SOURCES_EMBEDDED   "${BTSTACK_ROOT}/platform/embedded/*.c")
+#file(GLOB SOURCES_ZEPHYR    "${CMAKE_SOURCE_DIR}/src/main.c")
+#file(GLOB SOURCES_ZEPHYR    "${BTSTACK_ROOT}/chipset/zephyr/*.c")
+#file(GLOB SOURCES_REALTEK   "${BTSTACK_ROOT}/chipset/realtek/*.c")
+#file(GLOB SOURCES_LC3_GOOGLE "${BTSTACK_ROOT}/3rd-party/lc3-google/src/*.c")
+
+set(LWIP_CORE_SRC
+	3rd-party/lwip/core/src/core/def.c
+	3rd-party/lwip/core/src/core/inet_chksum.c
+	3rd-party/lwip/core/src/core/init.c
+	3rd-party/lwip/core/src/core/ip.c
+	3rd-party/lwip/core/src/core/mem.c
+	3rd-party/lwip/core/src/core/memp.c
+	3rd-party/lwip/core/src/core/netif.c
+	3rd-party/lwip/core/src/core/pbuf.c
+	3rd-party/lwip/core/src/core/tcp.c
+	3rd-party/lwip/core/src/core/tcp_in.c
+	3rd-party/lwip/core/src/core/tcp_out.c
+	3rd-party/lwip/core/src/core/timeouts.c
+	3rd-party/lwip/core/src/core/udp.c
+)
+set (LWIP_IPV4_SRC
+	3rd-party/lwip/core/src/core/ipv4/acd.c
+	3rd-party/lwip/core/src/core/ipv4/dhcp.c
+	3rd-party/lwip/core/src/core/ipv4/etharp.c
+	3rd-party/lwip/core/src/core/ipv4/icmp.c
+	3rd-party/lwip/core/src/core/ipv4/ip4.c
+    3rd-party/lwip/core/src/core/ipv4/ip4_addr.c
+	3rd-party/lwip/core/src/core/ipv4/ip4_frag.c
+)
+set (LWIP_NETIF_SRC
+	3rd-party/lwip/core/src/netif/ethernet.c
+)
+set (LWIP_HTTPD
+	3rd-party/lwip/core/src/apps/http/altcp_proxyconnect.c
+	3rd-party/lwip/core/src/apps/http/fs.c
+	3rd-party/lwip/core/src/apps/http/httpd.c
+)
+set (LWIP_DHCPD
+	3rd-party/lwip/dhcp-server/dhserver.c
+)
+set (LWIP_PORT
+	platform/lwip/port/sys_arch.c
+	platform/lwip/bnep_lwip.c
+)
+
+set (SOURCES_LWIP ${LWIP_CORE_SRC} ${LWIP_IPV4_SRC} ${LWIP_NETIF_SRC} ${LWIP_HTTPD} ${LWIP_DHCPD} ${LWIP_PORT})
+list(TRANSFORM SOURCES_LWIP PREPEND ${BTSTACK_ROOT}/)
+
+file(GLOB SOURCES_SRC_OFF "${BTSTACK_ROOT}/src/hci_transport_*.c")
+list(REMOVE_ITEM SOURCES_SRC   ${SOURCES_SRC_OFF})
+
+file(GLOB SOURCES_BLE_OFF "${BTSTACK_ROOT}/src/ble/att_db_util.c")
+list(REMOVE_ITEM SOURCES_BLE   ${SOURCES_BLE_OFF})
+
+set(SOURCES
+	${SOURCES_MD5}
+	${SOURCES_YXML}
+	${SOURCES_BLUEDROID}
+    ${SOURCES_EMBEDDED}
+	${SOURCES_RIJNDAEL}
+    ${SOURCES_LC3_GOOGLE}
+	${SOURCES_SRC}
+	${SOURCES_BLE}
+	${SOURCES_GATT}
+    #	${SOURCES_MESH}
+    #   ${SOURCES_CLASSIC}
+	${SOURCES_UECC}
+    #	${SOURCES_HXCMOD}
+    #	${SOURCES_REALTEK}
+    #	${SOURCES_ZEPHYR}
+)
+list(SORT SOURCES)
+
+# create static lib
+add_library(btstack STATIC ${SOURCES})
+
+# extra compiler warnings
+target_compile_options(btstack PRIVATE
+     $<$<OR:$<CXX_COMPILER_ID:Clang>,$<CXX_COMPILER_ID:AppleClang>>:
+            -Wunused-variable -Wswitch-default -Werror -Wall>
+     $<$<CXX_COMPILER_ID:GNU>:
+            -Wunused-but-set-variable -Wunused-variable -Wswitch-default -Werror -Wall>
+     $<$<CXX_COMPILER_ID:MSVC>:
+            /W4>)
+
+# get zephyr's idea of build flags
+zephyr_get_include_directories_for_lang(       C includes)
+zephyr_get_system_include_directories_for_lang(C system_includes)
+zephyr_get_compile_definitions_for_lang(       C definitions)
+zephyr_get_compile_options_for_lang(           C options)
+
+set(external_project_cflags
+    ${includes}$<SEMICOLON>${definitions}$<SEMICOLON>${options}$<SEMICOLON>${system_includes}
+  )
+
+# prevent imacros argument from deduplication
+string( REGEX REPLACE "\\$<TARGET_PROPERTY:compiler,imacros>\\$<SEMICOLON>([^\\$]+)"
+    "\$<1:SHELL:-imacros \\1>"
+     _all_options ${external_project_cflags} )
+
+target_compile_options( btstack PUBLIC ${_all_options})
+
+set(EXAMPLES "gatt_counter" )
+if(DEFINED ENV{EXAMPLE})
+    set( EXAMPLES $ENV{EXAMPLE} )
+endif()
+
+list(SORT EXAMPLES)
+file(GLOB EXAMPLES_GATT "${BTSTACK_ROOT}/example/*.gatt")
+
+# remove some
+file(GLOB EXAMPLES_OFF  "../../example/sco_demo_util.c" "../../example/ant_test.c" "../../example/avrcp_browsing_client.c")
+list(REMOVE_ITEM EXAMPLES_C ${EXAMPLES_OFF})
+
+# on Mac 10.14, adding lwip to libstack results in a yet not understood link error
+# workaround: add lwip sources only to lwip_examples
+set (LWIP_EXAMPLES pan_lwip_http_server)
+
+# create targets
+foreach(EXAMPLE ${EXAMPLES})
+    #	get_filename_component(EXAMPLE ${EXAMPLE_FILE} NAME_WE)
+
+	# get c file
+	set (SOURCES_EXAMPLE ${BTSTACK_ROOT}/example/${EXAMPLE}.c)
+    list(APPEND SOURCES_EXAMPLE "${CMAKE_SOURCE_DIR}/src/main.c")
+    message("${BTSTACK_ROOT}")
+    message("${SOURCES_EXAMPLE}")
+	# add lwip sources for lwip examples
+	if ( "${LWIP_EXAMPLES}" MATCHES ${EXAMPLE} )
+		list(APPEND SOURCES_EXAMPLE ${SOURCES_LWIP})
+	endif()
+
+	# add GATT DB creation
+	if ( "${EXAMPLES_GATT}" MATCHES ${EXAMPLE} )
+		message("example ${EXAMPLE} -- with GATT DB")
+		add_custom_command(
+		    OUTPUT ${CMAKE_CURRENT_BINARY_DIR}/${EXAMPLE}.h
+			DEPENDS ${BTSTACK_ROOT}/example/${EXAMPLE}.gatt
+			COMMAND ${Python_EXECUTABLE}
+			ARGS ${BTSTACK_ROOT}/tool/compile_gatt.py ${BTSTACK_ROOT}/example/${EXAMPLE}.gatt ${CMAKE_CURRENT_BINARY_DIR}/${EXAMPLE}.h
+		)
+		list(APPEND SOURCES_EXAMPLE ${CMAKE_CURRENT_BINARY_DIR}/${EXAMPLE}.h)
+	else()
+		message("example ${EXAMPLE}")
+	endif()
+    #	add_executable(${EXAMPLE} ${SOURCES_EXAMPLE} )
+    target_sources( app PRIVATE ${SOURCES_EXAMPLE} )
+    #    target_link_libraries(${EXAMPLE} btstack)
+    target_link_libraries( app PRIVATE btstack )
+endforeach(EXAMPLE)
--- a/port/zephyr/README.md
+++ b/port/zephyr/README.md
@ -0,0 +1,39 @@
+# Bluetooth: btstack
+
+## Overview
+
+This sample demonstrates Bluetooth functionality utilizing btstack.
+
+## Requirements
+
+* A board with Bluetooth LE support
+
+## Building and Running
+
+first step needs only be done once.
+Step two every time.
+
+### 1. Build environment preconditions
+Follow the getting started [guide](https://docs.zephyrproject.org/latest/develop/getting_started/index.html)
+till you can build samples.
+Then update 'env.sh' accordingly.
+
+### 2. Prepare the build environmet
+before beeing able to build this sample the environment needs to be prepared with:
+```sh
+source env.sh
+```
+
+### 3. Building samples
+You can build using:
+```sh
+west build -b nrf52840dk_nrf52840
+```
+to change zephyr platform settings use:
+```sh
+west build -b nrf52840dk_nrf52840 -t menuconfig
+```
+to build a different example:
+```sh
+EXAMPLE=gatt_streamer_server west build -b nrf52840dk_nrf52840
+```
--- a/port/zephyr/btstack_config.h
+++ b/port/zephyr/btstack_config.h
@ -0,0 +1,47 @@
+//
+// btstack_config.h for mRF5-Zephyr port
+//
+// Documentation: https://bluekitchen-gmbh.com/btstack/#how_to/
+//
+
+#ifndef BTSTACK_CONFIG_H
+#define BTSTACK_CONFIG_H
+
+// Port related features
+
+// BTstack features that can be enabled
+#define ENABLE_BLE
+#define ENABLE_LE_CENTRAL
+#define ENABLE_L2CAP_LE_CREDIT_BASED_FLOW_CONTROL_MODE
+#define ENABLE_LE_DATA_LENGTH_EXTENSION
+#define ENABLE_LE_PERIPHERAL
+#define ENABLE_LOG_ERROR
+#define ENABLE_LOG_INFO
+#define ENABLE_PRINTF_HEXDUMP
+
+// BTstack configuration. buffers, sizes, ...
+#define HCI_ACL_PAYLOAD_SIZE 260
+#define MAX_NR_GATT_CLIENTS 1
+#define MAX_NR_HCI_CONNECTIONS 1
+#define MAX_NR_L2CAP_CHANNELS 1
+#define MAX_NR_L2CAP_SERVICES 1
+#define MAX_NR_SM_LOOKUP_ENTRIES 3
+#define MAX_NR_WHITELIST_ENTRIES 1
+
+#define MAX_NR_BNEP_CHANNELS 0
+#define MAX_NR_BNEP_SERVICES 0
+#define MAX_NR_BTSTACK_LINK_KEY_DB_MEMORY_ENTRIES 0
+#define MAX_NR_HFP_CONNECTIONS 0
+#define MAX_NR_LE_DEVICE_DB_ENTRIES 1
+#define MAX_NR_RFCOMM_CHANNELS 0
+#define MAX_NR_RFCOMM_MULTIPLEXERS 0
+#define MAX_NR_RFCOMM_SERVICES 0
+#define MAX_NR_SERVICE_RECORD_ITEMS 0
+
+// hack to fix usage of hci_init in zephry
+#define hci_init btstack_hci_init
+
+// LE Device DB using TLV
+#define NVM_NUM_DEVICE_DB_ENTRIES 16
+
+#endif
--- a/port/zephyr/env.sh
+++ b/port/zephyr/env.sh
@ -0,0 +1,4 @@
+ZEPHYR_ROOT=<needs to be set>
+
+source ${ZEPHYR_ROOT}/.venv/bin/activate
+source ${ZEPHYR_ROOT}/zephyr/zephyr-env.sh
--- a/port/zephyr/prj.conf
+++ b/port/zephyr/prj.conf
@ -0,0 +1,57 @@
+# Debug output
+#CONFIG_CONSOLE=y
+#CONFIG_STDOUT_CONSOLE=y
+CONFIG_UART_CONSOLE=n
+CONFIG_RTT_CONSOLE=y
+CONFIG_USE_SEGGER_RTT=y
+#CONFIG_GPIO=y
+#CONFIG_SERIAL=y
+#CONFIG_UART_INTERRUPT_DRIVEN=y
+
+CONFIG_I2C=n
+CONFIG_WATCHDOG=n
+CONFIG_SPI=n
+CONFIG_SERIAL=n
+
+CONFIG_PM=n
+
+CONFIG_DYNAMIC_INTERRUPTS=n
+CONFIG_IRQ_OFFLOAD=n
+
+CONFIG_BOOT_BANNER=n
+CONFIG_BOOT_DELAY=0
+
+CONFIG_SIZE_OPTIMIZATIONS=y
+CONFIG_ARM_MPU=n
+
+CONFIG_BT=y
+CONFIG_BT_HCI_RAW=y
+CONFIG_BT_BUF_ACL_RX_SIZE=255
+CONFIG_BT_BUF_CMD_TX_SIZE=255
+CONFIG_BT_BUF_EVT_DISCARDABLE_SIZE=255
+CONFIG_BT_CTLR_ASSERT_HANDLER=y
+CONFIG_BT_MAX_CONN=16
+CONFIG_BT_TINYCRYPT_ECC=n
+#CONFIG_BT_CTLR_DTM_HCI=y
+
+CONFIG_BT_CTLR_PRIVACY=n
+CONFIG_BT_CTLR_PHY_2M=n
+
+CONFIG_BT_RX_STACK_SIZE=1024
+CONFIG_BT_HCI_TX_STACK_SIZE_WITH_PROMPT=y
+CONFIG_BT_HCI_TX_STACK_SIZE=640
+CONFIG_SYSTEM_WORKQUEUE_STACK_SIZE=512
+#CONFIG_MPSL_WORK_STACK_SIZE=640
+CONFIG_MAIN_STACK_SIZE=4096
+CONFIG_IDLE_STACK_SIZE=128
+CONFIG_ISR_STACK_SIZE=1024
+
+#CONFIG_THREAD_ANALYZER=y
+#CONFIG_THREAD_ANALYZER_USE_PRINTK=y
+#CONFIG_THREAD_ANALYZER_AUTO=y
+#CONFIG_THREAD_ANALYZER_AUTO_INTERVAL=5
+#CONFIG_THREAD_NAME=y
+
+# Workaround: Unable to allocate command buffer when using K_NO_WAIT since
+# Host number of completed commands does not follow normal flow control.
+CONFIG_BT_BUF_CMD_TX_COUNT=10
--- a/port/zephyr/sample.yaml
+++ b/port/zephyr/sample.yaml
@ -0,0 +1,12 @@
+sample:
+  name: Bluetooth btstack
+tests:
+  sample.bluetooth.btstack:
+    harness: bluetooth
+    platform_allow:
+      - bbc_microbit
+      - qemu_x86
+      - nrf52840dk_nrf52840
+    integration_platforms:
+      - qemu_x86
+    tags: bluetooth
--- a/port/zephyr/src/main.c
+++ b/port/zephyr/src/main.c
@ -0,0 +1,272 @@
+/*
+ * Copyright (c) 2016 Nordic Semiconductor ASA
+ * Copyright (c) 2015-2016 Intel Corporation
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#include <errno.h>
+#include <stddef.h>
+#include <stdio.h>
+#include <string.h>
+
+#include <zephyr/kernel.h>
+#include <zephyr/bluetooth/bluetooth.h>
+#include <zephyr/bluetooth/l2cap.h>
+#include <zephyr/bluetooth/hci.h>
+#include <zephyr/bluetooth/buf.h>
+#include <zephyr/bluetooth/hci_raw.h>
+
+// Nordic NDK
+#include "nrf.h"
+
+// BTstack
+#include "btstack_debug.h"
+#include "btstack_event.h"
+#include "btstack_memory.h"
+#include "btstack_run_loop_zephyr.h"
+#include "hci.h"
+#include "hci_dump.h"
+#include "hci_dump_embedded_stdout.h"
+#include "hci_transport.h"
+
+#include "btstack_tlv.h"
+#include "btstack_tlv_none.h"
+#include "ble/le_device_db_tlv.h"
+
+static K_FIFO_DEFINE(tx_queue);
+static K_FIFO_DEFINE(rx_queue);
+
+//
+// hci_transport_zephyr.c
+//
+
+static void (*transport_packet_handler)(uint8_t packet_type, uint8_t *packet, uint16_t size);
+
+/**
+ * init transport
+ * @param transport_config
+ */
+static void transport_init(const void *transport_config){
+	/* startup Controller */
+	bt_enable_raw(&rx_queue);
+}
+
+/**
+ * open transport connection
+ */
+static int transport_open(void){
+    return 0;
+}
+
+/**
+ * close transport connection
+ */
+static int transport_close(void){
+    return 0;
+}
+
+/**
+ * register packet handler for HCI packets: ACL, SCO, and Events
+ */
+static void transport_register_packet_handler(void (*handler)(uint8_t packet_type, uint8_t *packet, uint16_t size)){
+    transport_packet_handler = handler;
+}
+
+static void send_hardware_error(uint8_t error_code){
+    // hci_outgoing_event[0] = HCI_EVENT_HARDWARE_ERROR;
+    // hci_outgoing_event[1] = 1;
+    // hci_outgoing_event[2] = error_code;
+    // hci_outgoing_event_ready = 1;
+}
+
+static int transport_send_packet(uint8_t packet_type, uint8_t *packet, int size){
+	struct net_buf *buf;
+    switch (packet_type){
+        case HCI_COMMAND_DATA_PACKET:
+		    buf = bt_buf_get_tx(BT_BUF_CMD, K_NO_WAIT, packet, size);
+			if (!buf) {
+				log_error("No available command buffers!\n");
+                break;
+			}
+
+			memcpy(net_buf_add(buf, size), packet, size);
+			bt_send(buf);
+            break;
+        case HCI_ACL_DATA_PACKET:
+		    buf = bt_buf_get_tx(BT_BUF_ACL_OUT, K_NO_WAIT, packet, size);
+			if (!buf) {
+				log_error("No available ACL buffers!\n");
+                break;
+			}
+
+			memcpy(net_buf_add(buf, size), packet, size);
+			bt_send(buf);
+            break;
+        default:
+            send_hardware_error(0x01);  // invalid HCI packet
+            break;
+    }
+
+    return 0;
+}
+
+static const hci_transport_t transport = {
+    /* const char * name; */                                        "nRF5-Zephyr",
+    /* void   (*init) (const void *transport_config); */            &transport_init,
+    /* int    (*open)(void); */                                     &transport_open,
+    /* int    (*close)(void); */                                    &transport_close,
+    /* void   (*register_packet_handler)(void (*handler)(...); */   &transport_register_packet_handler,
+    /* int    (*can_send_packet_now)(uint8_t packet_type); */       NULL,
+    /* int    (*send_packet)(...); */                               &transport_send_packet,
+    /* int    (*set_baudrate)(uint32_t baudrate); */                NULL,
+    /* void   (*reset_link)(void); */                               NULL,
+};
+
+static const hci_transport_t * transport_get_instance(void){
+	return &transport;
+}
+
+static void transport_deliver_controller_packet(struct net_buf * buf){
+		uint16_t    size = buf->len;
+		uint8_t * packet = buf->data;
+		switch (bt_buf_get_type(buf)) {
+			case BT_BUF_ACL_IN:
+				transport_packet_handler(HCI_ACL_DATA_PACKET, packet, size);
+				break;
+			case BT_BUF_EVT:
+				transport_packet_handler(HCI_EVENT_PACKET, packet, size);
+				break;
+			default:
+				log_error("Unknown type %u\n", bt_buf_get_type(buf));
+				break;
+		}
+		net_buf_unref(buf);
+}
+
+// btstack_run_loop_zephry.c
+
+// the run loop
+//static btstack_linked_list_t timers;
+
+// TODO: handle 32 bit ms time overrun
+static uint32_t btstack_run_loop_zephyr_get_time_ms(void){
+	return  k_uptime_get_32();
+}
+
+static void btstack_run_loop_zephyr_set_timer(btstack_timer_source_t *ts, uint32_t timeout_in_ms){
+    ts->timeout = k_uptime_get_32() + 1 + timeout_in_ms;
+}
+
+/**
+ * Execute run_loop
+ */
+static void btstack_run_loop_zephyr_execute(void) {
+    while (1) {
+        // process timers
+        uint32_t now = k_uptime_get_32();
+        btstack_run_loop_base_process_timers(now);
+
+        // get time until next timer expires
+        k_timeout_t timeout;
+        timeout.ticks = btstack_run_loop_base_get_time_until_timeout(now);
+        if (timeout.ticks < 0){
+            timeout.ticks = K_TICKS_FOREVER;
+        }
+
+        // process RX fifo only
+        struct net_buf *buf = net_buf_get(&rx_queue, timeout);
+		if (buf){
+			transport_deliver_controller_packet(buf);
+		}
+	}
+}
+
+static void btstack_run_loop_zephyr_btstack_run_loop_init(void){
+    btstack_run_loop_base_init();
+}
+
+static const btstack_run_loop_t btstack_run_loop_zephyr = {
+    &btstack_run_loop_zephyr_btstack_run_loop_init,
+    NULL,
+    NULL,
+    NULL,
+    NULL,
+    &btstack_run_loop_zephyr_set_timer,
+    &btstack_run_loop_base_add_timer,
+    &btstack_run_loop_base_remove_timer,
+    &btstack_run_loop_zephyr_execute,
+    &btstack_run_loop_base_dump_timer,
+    &btstack_run_loop_zephyr_get_time_ms,
+};
+/**
+ * @brief Provide btstack_run_loop_posix instance for use with btstack_run_loop_init
+ */
+const btstack_run_loop_t * btstack_run_loop_zephyr_get_instance(void){
+    return &btstack_run_loop_zephyr;
+}
+
+static btstack_packet_callback_registration_t hci_event_callback_registration;
+
+static bd_addr_t static_address;
+
+static void packet_handler (uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size){
+    if (packet_type != HCI_EVENT_PACKET) return;
+    if (hci_event_packet_get_type(packet) != BTSTACK_EVENT_STATE) return;
+    if (btstack_event_state_get_state(packet) != HCI_STATE_WORKING) return;
+    printf("BTstack up and running as %s.\n", bd_addr_to_str(static_address));
+}
+
+int btstack_main(void);
+
+#if defined(CONFIG_BT_CTLR_ASSERT_HANDLER)
+void bt_ctlr_assert_handle(char *file, uint32_t line)
+{
+	printf("CONFIG_BT_CTLR_ASSERT_HANDLER: file %s, line %u\n", file, line);
+	while (1) {
+	}
+}
+#endif /* CONFIG_BT_CTLR_ASSERT_HANDLER */
+
+void main(void)
+{
+	// configure console UART by replacing CONFIG_UART_NRF5_BAUD_RATE with 115200 in uart_console.c
+
+	printf("BTstack booting up..\n");
+
+	// start with BTstack init - especially configure HCI Transport
+    btstack_memory_init();
+    btstack_run_loop_init(btstack_run_loop_zephyr_get_instance());
+
+    // enable full log output while porting
+    hci_dump_init(hci_dump_embedded_stdout_get_instance());
+
+    const btstack_tlv_t * btstack_tlv_impl = btstack_tlv_none_init_instance();
+    // setup global tlv
+    btstack_tlv_set_instance(btstack_tlv_impl, NULL);
+
+    // setup LE Device DB using TLV
+    le_device_db_tlv_configure(btstack_tlv_impl, NULL);
+
+    // init HCI
+    hci_init(transport_get_instance(), NULL);
+
+    // nRF5 chipsets don't have an official public address
+    // Instead, a Static Random Address is assigned during manufacturing
+    // let's use it as well
+    big_endian_store_16(static_address, 0, NRF_FICR->DEVICEADDR[1] | 0xc000);
+    big_endian_store_32(static_address, 2, NRF_FICR->DEVICEADDR[0]);
+    gap_random_address_set(static_address);
+
+    // inform about BTstack state
+    hci_event_callback_registration.callback = &packet_handler;
+    hci_add_event_handler(&hci_event_callback_registration);
+
+    // hand over to btstack embedded code 
+    btstack_main();
+
+    // go
+    btstack_run_loop_execute();
+
+    while (1){};
+}