diff --git a/.gitignore b/.gitignore
index fc4d337..c8e4d13 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,2 +1,2 @@
-build/*
+**/build/*
 .vscode/*
diff --git a/CMSIS/CMakeLists.txt b/CMSIS/CMakeLists.txt
index 60c7fa8..65df136 100644
--- a/CMSIS/CMakeLists.txt
+++ b/CMSIS/CMakeLists.txt
@@ -10,4 +10,3 @@ target_include_directories(cmsis INTERFACE
         ${CMSIS_PATH}/Core/Include
         ${CMSIS_PATH}/Device/${CMSIS_VENDOR}/${CMSIS_DEVICE}/Include
 )
-target_link_libraries(cmsis INTERFACE driver)
\ No newline at end of file
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 171daf6..04c3cca 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1,47 +1,18 @@
-cmake_minimum_required(VERSION 3.10)
-set(PROJ_NAME "app")
-set(BIN_FILE ${PROJ_NAME}.bin)
-set(ASM_FILE ${PROJ_NAME}.asm)
-project(${PROJ_NAME} VERSION 0.1)
-
-# toolchain path
-set(TOOLCHAIN "arm-none-eabi-")
-set(CMAKE_C_COMPILER "${TOOLCHAIN}gcc")
-set(CMAKE_ASM_COMPILER "${TOOLCHAIN}gcc")
-set(CMAKE_OBJCOPY "${TOOLCHAIN}objcopy")
-set(CMAKE_OBJDUMP "${TOOLCHAIN}objdump")
-set(CMAKE_AR "${TOOLCHAIN}ar")
-set(CMAKE_RANLIB "${TOOLCHAIN}ranlib")
-set(LINKER_SCRIPT "${CMAKE_CURRENT_SOURCE_DIR}/ram.ld")
-
-set(BASE_DIR ${CMAKE_CURRENT_LIST_DIR})
-
-set(MCU_FLAGS "-mcpu=cortex-m0plus -mthumb -g -O2 -Wall -nostartfiles -ffunction-sections -fdata-sections")
-set(CMAKE_C_FLAGS "${MCU_FLAGS}")
-set(CMAKE_ASM_FLAGS "${MCU_FLAGS}")
-set(CMAKE_EXE_LINKER_FLAGS "${MCU_FLAGS} -T${LINKER_SCRIPT} -Wl,-Map=app.map")
-
 enable_language(ASM)
-add_executable(${PROJ_NAME}.elf main.c)
-target_sources(${PROJ_NAME}.elf PUBLIC start.S)
 
-add_subdirectory(${BASE_DIR}/driver driver)
-target_link_libraries(${PROJ_NAME}.elf driver)
+add_library(sdk STATIC)
 
-add_subdirectory(${BASE_DIR}/component component)
-target_link_libraries(${PROJ_NAME}.elf component)
+add_subdirectory(${SDK_BASE_DIR}/driver driver)
+target_link_libraries(sdk driver)
 
-add_subdirectory(${BASE_DIR}/CMSIS)
-target_link_libraries(${PROJ_NAME}.elf cmsis)
+add_subdirectory(${SDK_BASE_DIR}/component component)
+target_link_libraries(sdk component)
 
-add_subdirectory(${BASE_DIR}/core0)
-target_link_libraries(${PROJ_NAME}.elf core0)
+add_subdirectory(${SDK_BASE_DIR}/CMSIS)
+target_link_libraries(sdk cmsis)
 
-add_subdirectory(${BASE_DIR}/core1)
-target_link_libraries(${PROJ_NAME}.elf core1)
-
-add_custom_command(TARGET ${PROJ_NAME}.elf POST_BUILD
-    COMMAND ${CMAKE_OBJCOPY} -Obinary $<TARGET_FILE:${PROJ_NAME}.elf> ${BIN_FILE}
-    COMMAND ${CMAKE_OBJDUMP} -d -S $<TARGET_FILE:${PROJ_NAME}.elf> >${ASM_FILE}
-    COMMENT "Generate ${BIN_FILE}\r\n"
-)
+# add_custom_command(TARGET ${PROJ_NAME}.elf POST_BUILD
+#     COMMAND ${CMAKE_OBJCOPY} -Obinary $<TARGET_FILE:${PROJ_NAME}.elf> ${PROJ_NAME}.bin
+#     COMMAND ${CMAKE_OBJDUMP} -d -S $<TARGET_FILE:${PROJ_NAME}.elf> >${PROJ_NAME}.asm
+#     COMMENT "Generate ${BIN_FILE}\r\n"
+# )
diff --git a/component/eth/CMakeLists.txt b/component/eth/CMakeLists.txt
index 66ac72f..9f31bf0 100644
--- a/component/eth/CMakeLists.txt
+++ b/component/eth/CMakeLists.txt
@@ -6,5 +6,3 @@ set(TARGET eth)
 add_library(${TARGET} STATIC ${FILELIST})
 
 target_include_directories(${TARGET} PUBLIC ${CMAKE_CURRENT_SOURCE_DIR})
-# target_include_directories(${TARGET} PUBLIC ${BASE_DIR}/driver/inc)
-# target_include_directories(${TARGET} PUBLIC ${BASE_DIR}/driver/inc/reg)
diff --git a/component/pio_instance/CMakeLists.txt b/component/pio_instance/CMakeLists.txt
index 5a30806..0412fee 100644
--- a/component/pio_instance/CMakeLists.txt
+++ b/component/pio_instance/CMakeLists.txt
@@ -6,5 +6,5 @@ set(TARGET pio_instance)
 add_library(${TARGET} STATIC ${FILELIST})
 
 target_include_directories(${TARGET} PUBLIC ${CMAKE_CURRENT_SOURCE_DIR}/inc)
-target_include_directories(${TARGET} PUBLIC ${BASE_DIR}/driver/inc)
-target_include_directories(${TARGET} PUBLIC ${BASE_DIR}/driver/inc/reg)
+target_include_directories(${TARGET} PUBLIC ${SDK_BASE_DIR}/driver/inc)
+target_include_directories(${TARGET} PUBLIC ${SDK_BASE_DIR}/driver/inc/reg)
diff --git a/component/printf/CMakeLists.txt b/component/printf/CMakeLists.txt
index 875540e..373b9aa 100644
--- a/component/printf/CMakeLists.txt
+++ b/component/printf/CMakeLists.txt
@@ -6,5 +6,5 @@ vsnprintf.c
 set(TARGET printf)
 add_library(${TARGET} STATIC ${FILELIST})
 
-target_include_directories(${TARGET} PUBLIC ${BASE_DIR}/driver/inc)
-target_include_directories(${TARGET} PUBLIC ${BASE_DIR}/driver/inc/reg)
+target_include_directories(${TARGET} PUBLIC ${SDK_BASE_DIR}/driver/inc)
+target_include_directories(${TARGET} PUBLIC ${SDK_BASE_DIR}/driver/inc/reg)
diff --git a/driver/CMakeLists.txt b/driver/CMakeLists.txt
index 6cb8c13..2849181 100644
--- a/driver/CMakeLists.txt
+++ b/driver/CMakeLists.txt
@@ -1,4 +1,5 @@
 file(GLOB FILELIST
+start.S
 src/common.c
 src/system.c
 src/reset.c
@@ -16,5 +17,5 @@ add_library(${TARGET} STATIC ${FILELIST})
 
 target_include_directories(${TARGET} PUBLIC ${CMAKE_CURRENT_SOURCE_DIR}/inc)
 target_include_directories(${TARGET} PUBLIC ${CMAKE_CURRENT_SOURCE_DIR}/inc/reg)
-target_include_directories(${TARGET} PUBLIC ${BASE_DIR}/CMSIS/Core/Include/)
-target_include_directories(${TARGET} PUBLIC ${BASE_DIR}/CMSIS/Device/RaspberryPi/RP2040/Include)
+target_include_directories(${TARGET} PUBLIC ${SDK_BASE_DIR}/CMSIS/Core/Include/)
+target_include_directories(${TARGET} PUBLIC ${SDK_BASE_DIR}/CMSIS/Device/RaspberryPi/RP2040/Include)
diff --git a/start.S b/driver/start.S
similarity index 100%
rename from start.S
rename to driver/start.S
diff --git a/example/peripherals/gpio/gpio_led/CMakeLists.txt b/example/peripherals/gpio/gpio_led/CMakeLists.txt
new file mode 100644
index 0000000..fd4ff0f
--- /dev/null
+++ b/example/peripherals/gpio/gpio_led/CMakeLists.txt
@@ -0,0 +1,10 @@
+cmake_minimum_required(VERSION 3.10)
+
+include(proj.conf)
+
+set(PROJ_NAME "gpio_led")
+project(${PROJ_NAME} VERSION 0.1)
+add_executable(${PROJ_NAME}.elf main.c)
+
+add_subdirectory(${SDK_BASE_DIR} sdk)
+target_link_libraries(${PROJ_NAME}.elf sdk)
diff --git a/example/peripherals/gpio/gpio_led/Makefile b/example/peripherals/gpio/gpio_led/Makefile
new file mode 100644
index 0000000..4cb9131
--- /dev/null
+++ b/example/peripherals/gpio/gpio_led/Makefile
@@ -0,0 +1,13 @@
+SDK_BASE_DIR ?= $(shell realpath ./../../../..)
+export SDK_BASE_DIR
+
+GCC_PATH := $(shell which arm-none-eabi-gcc)
+CROSS_COMPILE := $(patsubst %gcc,%,$(GCC_PATH))
+ifeq ($(GCC_PATH),)
+$(error arm-none-eabi-gcc not found in PATH. Please install the ARM toolchain.)
+endif
+
+# add custom cmake definition
+#cmake_definition+=-Dxxx=sss
+
+include $(SDK_BASE_DIR)/project.build
diff --git a/example/peripherals/gpio/gpio_led/main.c b/example/peripherals/gpio/gpio_led/main.c
new file mode 100644
index 0000000..ecc492c
--- /dev/null
+++ b/example/peripherals/gpio/gpio_led/main.c
@@ -0,0 +1,71 @@
+#include "system.h"
+#include "reset.h"
+#include "clock.h"
+#include "sio.h"
+#include "gpio.h"
+#include "uart.h"
+#include "stdio.h"
+#include "cmsis_gcc.h"
+
+struct gpio_cfg_s gpio_led_cfg = {
+    .pin = 25,
+    .sio_dir = GPIO_SIO_DIR_OUT,
+    .funcsel = GPIO_FUNC_SIO,
+    .over_out = GPIO_OVER_OUT_PERIPHERAL,
+    .over_oe = GPIO_OVER_OE_PERIPHERAL,
+    .over_in = GPIO_OVER_IN_PERIPHERAL,
+    .over_irq = GPIO_OVER_IRQ_NORMAL,
+    .slew_rate = GPIO_PADS_SLEW_RATE_SLOW, /* slew rate control, slow or fast */
+    .schmitt = ENABLE,                     /* enable or disable schmitt */
+    .pull_down = DISABLE,                  /* enable or disable pull down */
+    .pull_up = DISABLE,                    /* enable or disable pull up */
+    .drive = GPIO_PADS_DRIVE_STRENGTH_4MA, /* drive strength */
+    .ie = DISABLE,                         /* enable or disable input */
+    .od = DISABLE,                         /* output disable, has priority over output enable from peripherals */
+};
+
+struct uart_cfg_s uart_cfg = {
+    .baudrate = 6 * 1000 * 1000,
+    .mode = UART_MODE_TX_RX,
+    .data_bits = UART_DATABITS_8,
+    .parity = UART_PARITY_NONE,
+    .stop_bits = UART_STOPBITS_1,
+    .fifo_enable = ENABLE,
+    .tx_fifo_level = UART_FIFO_LEVEL_1_2,
+    .rx_fifo_level = UART_FIFO_LEVEL_1_2,
+};
+
+extern volatile uint32_t tick_1ms;
+
+void isr_uart0(void)
+{
+    uint32_t status = uart_int_get_mask_status(UART_ID_0);
+    printf("sts = 0x%08lX\t\n", status);
+}
+
+int main(void)
+{
+    reset_enable(RESET_IO_BANK0 | RESET_PADS_BANK0 | RESET_UART0);
+    reset_disable(RESET_IO_BANK0 | RESET_PADS_BANK0 | RESET_UART0);
+    gpio_init(&gpio_led_cfg);
+    gpio_init_simple(0, GPIO_FUNC_UART, DISABLE, ENABLE);
+
+    __enable_irq();
+
+    while (!reset_get_state(RESET_UART0));
+    uart_init(UART_ID_0, &uart_cfg);
+    uart_int_enable(UART_ID_0, UART_INT_ALL);
+    // NVIC_EnableIRQ(UART0_IRQ_IRQn);
+
+    while (1) {
+        static uint32_t tick_led = 0;
+
+        if (tick_1ms > (tick_led + 500)) {
+            tick_led = tick_1ms;
+            gpio_toggle(gpio_led_cfg.pin);
+            printf("tick_led = %ld\r\n", tick_led);
+        }
+    }
+
+    return 0;
+}
diff --git a/example/peripherals/gpio/gpio_led/proj.conf b/example/peripherals/gpio/gpio_led/proj.conf
new file mode 100644
index 0000000..7d2ef31
--- /dev/null
+++ b/example/peripherals/gpio/gpio_led/proj.conf
@@ -0,0 +1 @@
+# set(CONFIG_COMPONENT1 1)
diff --git a/project.build b/project.build
new file mode 100644
index 0000000..d4d9b00
--- /dev/null
+++ b/project.build
@@ -0,0 +1,41 @@
+ifndef VERBOSE
+MAKEFLAGS += --no-print-directory
+endif
+
+CFLAGS := -mcpu=cortex-m0plus -mthumb -g3 -O2 -Wall -ffunction-sections -fdata-sections
+
+LDFLAGS := -mcpu=cortex-m0plus -mthumb -g3 -O2 -Wall -ffunction-sections -fdata-sections -nostartfiles -T$(SDK_BASE_DIR)/ram.ld -Wl,-Map=app.map
+
+CMAKE := cmake
+
+# The command to remove a file.
+RM = $(CMAKE) -E remove_directory
+
+COMX ?=COM1
+BAUDRATE ?=2000000
+
+# cmake definition config
+# toolchain
+cmake_definition+= -DCMAKE_C_COMPILER=$(CROSS_COMPILE)gcc
+cmake_definition+= -DCMAKE_CXX_COMPILER=$(CROSS_COMPILE)g++
+cmake_definition+= -DCMAKE_ASM_COMPILER=$(CROSS_COMPILE)gcc
+cmake_definition+= -DCMAKE_LINKER=$(CROSS_COMPILE)ld
+cmake_definition+= -DCMAKE_OBJCOPY=$(CROSS_COMPILE)objcopy
+cmake_definition+= -DCMAKE_OBJDUMP=$(CROSS_COMPILE)objdump
+cmake_definition+= -DCMAKE_AR=$(CROSS_COMPILE)ar
+cmake_definition+= -DCMAKE_RANLIB=$(CROSS_COMPILE)ranlib
+cmake_definition+= -DCMAKE_C_FLAGS="$(CFLAGS)"
+cmake_definition+= -DCMAKE_CXX_FLAGS="$(CFLAGS)"
+cmake_definition+= -DCMAKE_EXE_LINKER_FLAGS="$(LDFLAGS)"
+
+cmake_definition+= -DCONFIG_COMX=$(COMX)
+cmake_definition+= -DSDK_BASE_DIR=$(SDK_BASE_DIR)
+
+build:Makefile
+	$(CMAKE) -S . -B build -G "Unix Makefiles" $(cmake_definition)
+	$(MAKE) -C build -j
+
+clean::
+	$(RM) build
+
+.PHONY:build clean