commit 56b104b14bf7ae94b19d79090836c65358eaec58
Author: Yilin Sun <imi415@imi.moe>
Date:   Sat Aug 12 14:39:55 2023 +0800

    Initial commit.
    
    Signed-off-by: Yilin Sun <imi415@imi.moe>

diff --git a/.clang-format b/.clang-format
new file mode 100644
index 0000000..214adf0
--- /dev/null
+++ b/.clang-format
@@ -0,0 +1,12 @@
+BasedOnStyle: Google
+IndentWidth: 4
+AlignConsecutiveMacros: Consecutive
+AlignConsecutiveDeclarations: Consecutive
+AlignConsecutiveAssignments: Consecutive
+AllowShortFunctionsOnASingleLine: None
+BreakBeforeBraces: Custom
+BraceWrapping:
+  AfterEnum: false
+  AfterStruct: false
+  SplitEmptyFunction: false
+ColumnLimit: 120
\ No newline at end of file
diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..2da6168
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,5 @@
+/cmake-build-*
+/build
+/board/*.bak
+/.vscode
+
diff --git a/.gitmodules b/.gitmodules
new file mode 100644
index 0000000..b73335e
--- /dev/null
+++ b/.gitmodules
@@ -0,0 +1,3 @@
+[submodule "SDK"]
+	path = SDK
+	url = git@git.minori.work:Embedded_SDK/Air001_SDK.git
diff --git a/CMakeLists.txt b/CMakeLists.txt
new file mode 100644
index 0000000..90c17a2
--- /dev/null
+++ b/CMakeLists.txt
@@ -0,0 +1,132 @@
+cmake_minimum_required(VERSION 3.10)
+
+project(air001_template)
+
+enable_language(CXX)
+enable_language(ASM)
+
+# Different linker scripts
+set(TARGET_LDSCRIPT_FLASH "${CMAKE_SOURCE_DIR}/SDK/Drivers/CMSIS/Device/PY32F0xx/Source/gcc/py32f030x6_flash.ld")
+
+set(TARGET_SOURCES
+    "SDK/Drivers/PY32F0xx_HAL_Driver/Src/py32f0xx_hal.c"
+    "SDK/Drivers/PY32F0xx_HAL_Driver/Src/py32f0xx_hal_adc.c"
+    "SDK/Drivers/PY32F0xx_HAL_Driver/Src/py32f0xx_hal_adc_ex.c"
+    "SDK/Drivers/PY32F0xx_HAL_Driver/Src/py32f0xx_hal_comp.c"
+    "SDK/Drivers/PY32F0xx_HAL_Driver/Src/py32f0xx_hal_cortex.c"
+    "SDK/Drivers/PY32F0xx_HAL_Driver/Src/py32f0xx_hal_crc.c"
+    "SDK/Drivers/PY32F0xx_HAL_Driver/Src/py32f0xx_hal_dma.c"
+    "SDK/Drivers/PY32F0xx_HAL_Driver/Src/py32f0xx_hal_exti.c"
+    "SDK/Drivers/PY32F0xx_HAL_Driver/Src/py32f0xx_hal_flash.c"
+    "SDK/Drivers/PY32F0xx_HAL_Driver/Src/py32f0xx_hal_gpio.c"
+    "SDK/Drivers/PY32F0xx_HAL_Driver/Src/py32f0xx_hal_i2c.c"
+    "SDK/Drivers/PY32F0xx_HAL_Driver/Src/py32f0xx_hal_irda.c"
+    "SDK/Drivers/PY32F0xx_HAL_Driver/Src/py32f0xx_hal_iwdg.c"
+    "SDK/Drivers/PY32F0xx_HAL_Driver/Src/py32f0xx_hal_led.c"
+    "SDK/Drivers/PY32F0xx_HAL_Driver/Src/py32f0xx_hal_lptim.c"
+    "SDK/Drivers/PY32F0xx_HAL_Driver/Src/py32f0xx_hal_pwr.c"
+    "SDK/Drivers/PY32F0xx_HAL_Driver/Src/py32f0xx_hal_rcc.c"
+    "SDK/Drivers/PY32F0xx_HAL_Driver/Src/py32f0xx_hal_rcc_ex.c"
+    "SDK/Drivers/PY32F0xx_HAL_Driver/Src/py32f0xx_hal_rtc.c"
+    "SDK/Drivers/PY32F0xx_HAL_Driver/Src/py32f0xx_hal_rtc_ex.c"
+    "SDK/Drivers/PY32F0xx_HAL_Driver/Src/py32f0xx_hal_spi.c"
+    "SDK/Drivers/PY32F0xx_HAL_Driver/Src/py32f0xx_hal_tim.c"
+    "SDK/Drivers/PY32F0xx_HAL_Driver/Src/py32f0xx_hal_tim_ex.c"
+    "SDK/Drivers/PY32F0xx_HAL_Driver/Src/py32f0xx_hal_uart.c"
+    "SDK/Drivers/PY32F0xx_HAL_Driver/Src/py32f0xx_hal_usart.c"
+    "SDK/Drivers/PY32F0xx_HAL_Driver/Src/py32f0xx_hal_wwdg.c"
+    "SDK/Drivers/PY32F0xx_HAL_Driver/Src/py32f0xx_ll_adc.c"
+    "SDK/Drivers/PY32F0xx_HAL_Driver/Src/py32f0xx_ll_comp.c"
+    "SDK/Drivers/PY32F0xx_HAL_Driver/Src/py32f0xx_ll_crc.c"
+    "SDK/Drivers/PY32F0xx_HAL_Driver/Src/py32f0xx_ll_dma.c"
+    "SDK/Drivers/PY32F0xx_HAL_Driver/Src/py32f0xx_ll_exti.c"
+    "SDK/Drivers/PY32F0xx_HAL_Driver/Src/py32f0xx_ll_gpio.c"
+    "SDK/Drivers/PY32F0xx_HAL_Driver/Src/py32f0xx_ll_i2c.c"
+    "SDK/Drivers/PY32F0xx_HAL_Driver/Src/py32f0xx_ll_led.c"
+    "SDK/Drivers/PY32F0xx_HAL_Driver/Src/py32f0xx_ll_lptim.c"
+    "SDK/Drivers/PY32F0xx_HAL_Driver/Src/py32f0xx_ll_pwr.c"
+    "SDK/Drivers/PY32F0xx_HAL_Driver/Src/py32f0xx_ll_rcc.c"
+    "SDK/Drivers/PY32F0xx_HAL_Driver/Src/py32f0xx_ll_rtc.c"
+    "SDK/Drivers/PY32F0xx_HAL_Driver/Src/py32f0xx_ll_spi.c"
+    "SDK/Drivers/PY32F0xx_HAL_Driver/Src/py32f0xx_ll_tim.c"
+    "SDK/Drivers/PY32F0xx_HAL_Driver/Src/py32f0xx_ll_usart.c"
+    "SDK/Drivers/PY32F0xx_HAL_Driver/Src/py32f0xx_ll_utils.c"
+    "SDK/Drivers/CMSIS/Device/PY32F0xx/Source/gcc/startup_py32f030x6.s"
+    "SDK/Drivers/CMSIS/Device/PY32F0xx/Source/system_py32f0xx.c"
+    "src/py32f0xx_hal_msp.c"
+    "src/py32f0xx_it.c"
+    "src/app_syscalls.c"
+    "src/main.c"
+)
+
+set(TARGET_C_DEFINES
+    "PY32F030x6"
+)
+
+set(TARGET_C_INCLUDES
+    "SDK/Drivers/PY32F0xx_HAL_Driver/Inc"
+    "SDK/Drivers/CMSIS/Include"
+    "SDK/Drivers/CMSIS/Device/PY32F0xx/Include"
+    "include"
+)
+
+# Shared libraries linked with application
+set(TARGET_LIBS
+    "c"
+    "m"
+    "nosys"
+)
+
+# Shared library and linker script search paths
+set(TARGET_LIB_DIRECTORIES
+)
+
+# Conditional flags
+# DEBUG
+set(CMAKE_C_FLAGS_DEBUG     "-DDEBUG -O0 -g")
+set(CMAKE_CXX_FLAGS_DEBUG   "-DDEBUG -O0 -g")
+set(CMAKE_ASM_FLAGS_DEBUG   "-DDEBUG -O0 -g")
+
+# RELEASE
+set(CMAKE_C_FLAGS_RELEASE        "-DNDEBUG -O2 -flto")
+set(CMAKE_CXX_FLAGS_RELEASE      "-DNDEBUG -O2 -flto")
+set(CMAKE_ASM_FLAGS_RELEASE      "-DNDEBUG -O2 -flto")
+set(CMAKE_EXE_LINKER_FLAGS_RELEASE "-flto")
+
+# Final compiler flags
+set(CMAKE_C_FLAGS          "${CMAKE_C_FLAGS} -Wall -fno-common -fno-builtin -ffreestanding -fdata-sections -ffunction-sections")
+set(CMAKE_CXX_FLAGS        "${CMAKE_CXX_FLAGS} -Wall -fno-common -fno-builtin -ffreestanding -fdata-sections -ffunction-sections")
+set(CMAKE_ASM_FLAGS        "${CMAKE_C_FLAGS} -x assembler-with-cpp")
+set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} -Wl,--gc-sections")
+
+# Shared sources, includes and definitions
+add_compile_definitions(${TARGET_C_DEFINES})
+include_directories(${TARGET_C_INCLUDES})
+link_directories(${TARGET_LIB_DIRECTORIES})
+link_libraries(${TARGET_LIBS})
+
+# Main targets are added here
+
+# Create ELF
+add_executable("${CMAKE_PROJECT_NAME}_FLASH.elf" ${TARGET_SOURCES})
+target_compile_definitions("${CMAKE_PROJECT_NAME}_FLASH.elf"
+    PRIVATE ${TARGET_C_DEFINES_XIP}
+    )
+target_link_options("${CMAKE_PROJECT_NAME}_FLASH.elf"
+    PRIVATE "-T${TARGET_LDSCRIPT_FLASH}"
+    PRIVATE "-Wl,--Map=${CMAKE_PROJECT_NAME}_FLASH.map"
+    )
+set_property(TARGET "${CMAKE_PROJECT_NAME}_FLASH.elf" APPEND
+    PROPERTY ADDITIONAL_CLEAN_FILES "${CMAKE_PROJECT_NAME}_FLASH.map"
+    )
+add_custom_command(OUTPUT "${CMAKE_PROJECT_NAME}_FLASH.hex"
+    COMMAND ${CMAKE_OBJCOPY} "-O" "ihex" "${CMAKE_PROJECT_NAME}_FLASH.elf" "${CMAKE_PROJECT_NAME}_FLASH.hex"
+    DEPENDS "${CMAKE_PROJECT_NAME}_FLASH.elf"
+    )
+add_custom_target("${CMAKE_PROJECT_NAME}_FLASH_HEX" DEPENDS "${CMAKE_PROJECT_NAME}_FLASH.hex")
+if(DEFINED TARGET_TOOLCHAIN_SIZE)
+    add_custom_command(TARGET "${CMAKE_PROJECT_NAME}_FLASH.elf" POST_BUILD
+        COMMAND ${TARGET_TOOLCHAIN_SIZE} "${CMAKE_PROJECT_NAME}_FLASH.elf"
+        )
+endif()
+
diff --git a/SDK b/SDK
new file mode 160000
index 0000000..c87caf2
--- /dev/null
+++ b/SDK
@@ -0,0 +1 @@
+Subproject commit c87caf25cde7c3b2deb90f15896d6cb52dba0989
diff --git a/arm-none-eabi.cmake b/arm-none-eabi.cmake
new file mode 100644
index 0000000..2b68248
--- /dev/null
+++ b/arm-none-eabi.cmake
@@ -0,0 +1,17 @@
+# Poor old Windows...
+if(WIN32)
+    set(CMAKE_SYSTEM_NAME "Generic")
+endif()
+
+set(CMAKE_C_COMPILER   arm-none-eabi-gcc)
+set(CMAKE_CXX_COMPILER arm-none-eabi-g++)
+
+# Optionally set size binary name, for elf section size reporting.
+set(TARGET_TOOLCHAIN_SIZE arm-none-eabi-size)
+
+set(CMAKE_C_FLAGS_INIT   "-mcpu=cortex-m0plus -mthumb -mfloat-abi=soft")
+set(CMAKE_CXX_FLAGS_INIT "-mcpu=cortex-m0plus -mthumb -mfloat-abi=soft")
+set(CMAKE_EXE_LINKER_FLAGS_INIT "-specs=nano.specs -specs=nosys.specs -Wl,--print-memory-usage -Wl,--no-warn-rwx-segments")
+
+# Make CMake happy about those compilers
+set(CMAKE_TRY_COMPILE_TARGET_TYPE "STATIC_LIBRARY")
diff --git a/include/.gitkeep b/include/.gitkeep
new file mode 100644
index 0000000..e69de29
diff --git a/include/app_syscalls.h b/include/app_syscalls.h
new file mode 100644
index 0000000..8bdba6b
--- /dev/null
+++ b/include/app_syscalls.h
@@ -0,0 +1,6 @@
+#ifndef APP_SYSCALLS_H
+#define APP_SYSCALLS_H
+
+void app_syscalls_init(void);
+
+#endif  // APP_SYSCALLS_H
diff --git a/include/main.h b/include/main.h
new file mode 100644
index 0000000..b6dd658
--- /dev/null
+++ b/include/main.h
@@ -0,0 +1,8 @@
+#ifndef MAIN_H
+#define MAIN_H
+
+#include "py32f0xx_hal.h"
+
+extern UART_HandleTypeDef huart1;
+
+#endif  // MAIN_H
diff --git a/include/py32f0xx_hal_conf.h b/include/py32f0xx_hal_conf.h
new file mode 100644
index 0000000..ccbaa66
--- /dev/null
+++ b/include/py32f0xx_hal_conf.h
@@ -0,0 +1,236 @@
+/**
+******************************************************************************
+* @file    py32f0xx_hal_conf.h
+* @author  MCU Application Team
+* @brief   HAL configuration file.
+******************************************************************************
+* @attention
+*
+* <h2><center>&copy; Copyright (c) Puya Semiconductor Co.
+* All rights reserved.</center></h2>
+*
+* <h2><center>&copy; Copyright (c) 2016 STMicroelectronics.
+* All rights reserved.</center></h2>
+*
+* This software component is licensed by ST under BSD 3-Clause license,
+* the "License"; You may not use this file except in compliance with the
+* License. You may obtain a copy of the License at:
+*                        opensource.org/licenses/BSD-3-Clause
+*
+******************************************************************************
+*/
+
+/* Define to prevent recursive inclusion -------------------------------------*/
+#ifndef __PY32F0xx_HAL_CONF_H
+#define __PY32F0xx_HAL_CONF_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/* Exported types ------------------------------------------------------------*/
+/* Exported constants --------------------------------------------------------*/
+
+/* ########################## Module Selection ############################## */
+/**
+* @brief This is the list of modules to be used in the HAL driver
+*/
+#define HAL_MODULE_ENABLED
+#define HAL_RCC_MODULE_ENABLED
+//#define HAL_ADC_MODULE_ENABLED
+//#define HAL_CRC_MODULE_ENABLED
+//#define HAL_COMP_MODULE_ENABLED
+#define HAL_FLASH_MODULE_ENABLED
+#define HAL_GPIO_MODULE_ENABLED
+//#define HAL_IWDG_MODULE_ENABLED
+//#define HAL_WWDG_MODULE_ENABLED
+//#define HAL_TIM_MODULE_ENABLED
+#define HAL_DMA_MODULE_ENABLED
+//#define HAL_LPTIM_MODULE_ENABLED
+#define HAL_PWR_MODULE_ENABLED
+//#define HAL_I2C_MODULE_ENABLED
+#define HAL_UART_MODULE_ENABLED
+//#define HAL_SPI_MODULE_ENABLED
+//#define HAL_RTC_MODULE_ENABLED
+//#define HAL_LED_MODULE_ENABLED
+//#define HAL_EXTI_MODULE_ENABLED
+#define HAL_CORTEX_MODULE_ENABLED
+/* ########################## Oscillator Values adaptation ####################*/
+
+#if !defined  (HSI_VALUE)
+#define HSI_VALUE    ((uint32_t)8000000)  /*!< Value of the Internal oscillator in Hz */
+#endif /* HSI_VALUE */
+
+/**
+* @brief Adjust the value of External High Speed oscillator (HSE) used in your application.
+*        This value is used by the RCC HAL module to compute the system frequency
+*/
+#if !defined  (HSE_VALUE)
+#define HSE_VALUE    ((uint32_t)24000000) /*!< Value of the External oscillator in Hz */
+#endif /* HSE_VALUE */
+
+#if !defined  (HSE_STARTUP_TIMEOUT)
+#define HSE_STARTUP_TIMEOUT    ((uint32_t)200)   /*!< Time out for HSE start up, in ms */
+#endif /* HSE_STARTUP_TIMEOUT */
+
+/**
+* @brief Internal Low Speed Internal oscillator (LSI) value.
+*/
+#if !defined  (LSI_VALUE)
+#define LSI_VALUE    ((uint32_t)32768)    /*!< LSI Typical Value in Hz */
+#endif /* LSI_VALUE */                     /*!< Value of the Internal Low Speed oscillator in Hz
+                                              The real value may vary depending on the variations
+                                              in voltage and temperature. */
+
+/**
+* @brief Adjust the value of External Low Speed oscillator (LSE) used in your application.
+*        This value is used by the RCC HAL module to compute the system frequency
+*/
+#if !defined  (LSE_VALUE)
+#define LSE_VALUE    ((uint32_t)32768) /*!< Value of the External oscillator in Hz*/
+#endif /* LSE_VALUE */
+
+
+
+#if !defined  (LSE_STARTUP_TIMEOUT)
+#define LSE_STARTUP_TIMEOUT    ((uint32_t)5000)   /*!< Time out for LSE start up, in ms */
+#endif /* LSE_STARTUP_TIMEOUT */
+
+/* Tip: To avoid modifying this file each time you need to use different HSE,
+ ===  you can define the HSE value in your toolchain compiler preprocessor. */
+
+/* ########################### System Configuration ######################### */
+/**
+* @brief This is the HAL system configuration section
+*/
+#define  VDD_VALUE                    ((uint32_t)3300) /*!< Value of VDD in mv */
+#define  PRIORITY_HIGHEST             0
+#define  PRIORITY_HIGH                1
+#define  PRIORITY_LOW                 2
+#define  PRIORITY_LOWEST              3
+#define  TICK_INT_PRIORITY            ((uint32_t)PRIORITY_LOWEST)    /*!< tick interrupt priority (lowest by default)  */
+#define  USE_RTOS                     0
+#define  PREFETCH_ENABLE              0
+
+/* ########################## Assert Selection ############################## */
+/**
+* @brief Uncomment the line below to expanse the "assert_param" macro in the
+*        HAL drivers code
+*/
+/* #define USE_FULL_ASSERT    1U */
+
+
+/* Includes ------------------------------------------------------------------*/
+/**
+* @brief Include module's header file
+*/
+
+
+#ifdef HAL_MODULE_ENABLED
+#include "py32f0xx_hal.h"
+#endif /* HAL_MODULE_ENABLED */
+
+#ifdef HAL_RCC_MODULE_ENABLED
+#include "py32f0xx_hal_rcc.h"
+#endif /* HAL_RCC_MODULE_ENABLED */
+
+#ifdef HAL_EXTI_MODULE_ENABLED
+#include "py32f0xx_hal_exti.h"
+#endif /* HAL_EXTI_MODULE_ENABLED */
+
+#ifdef HAL_GPIO_MODULE_ENABLED
+#include "py32f0xx_hal_gpio.h"
+#endif /* HAL_GPIO_MODULE_ENABLED */
+
+#ifdef HAL_CORTEX_MODULE_ENABLED
+#include "py32f0xx_hal_cortex.h"
+#endif /* HAL_CORTEX_MODULE_ENABLED */
+
+#ifdef HAL_DMA_MODULE_ENABLED
+#include "py32f0xx_hal_dma.h"
+#endif /* HAL_DMA_MODULE_ENABLED */
+
+#ifdef HAL_ADC_MODULE_ENABLED
+#include "py32f0xx_hal_adc.h"
+#endif /* HAL_ADC_MODULE_ENABLED */
+
+#ifdef HAL_CRC_MODULE_ENABLED
+#include "py32f0xx_hal_crc.h"
+#endif /* HAL_CRC_MODULE_ENABLED */
+
+#ifdef HAL_COMP_MODULE_ENABLED
+#include "py32f0xx_hal_comp.h"
+#endif /* HAL_COMP_MODULE_ENABLED */
+
+#ifdef HAL_FLASH_MODULE_ENABLED
+#include "py32f0xx_hal_flash.h"
+#endif /* HAL_FLASH_MODULE_ENABLED */
+
+#ifdef HAL_I2C_MODULE_ENABLED
+#include "py32f0xx_hal_i2c.h"
+#endif /* HAL_I2C_MODULE_ENABLED */
+
+#ifdef HAL_IWDG_MODULE_ENABLED
+#include "py32f0xx_hal_iwdg.h"
+#endif /* HAL_IWDG_MODULE_ENABLED */
+
+#ifdef HAL_PWR_MODULE_ENABLED
+#include "py32f0xx_hal_pwr.h"
+#endif /* HAL_PWR_MODULE_ENABLED */
+
+#ifdef HAL_RTC_MODULE_ENABLED
+#include "py32f0xx_hal_rtc.h"
+#endif /* HAL_RTC_MODULE_ENABLED */
+
+#ifdef HAL_SPI_MODULE_ENABLED
+#include "py32f0xx_hal_spi.h"
+#endif /* HAL_SPI_MODULE_ENABLED */
+
+#ifdef HAL_TIM_MODULE_ENABLED
+#include "py32f0xx_hal_tim.h"
+#endif /* HAL_TIM_MODULE_ENABLED */
+
+#ifdef HAL_LPTIM_MODULE_ENABLED
+#include "py32f0xx_hal_lptim.h"
+#endif /* HAL_LPTIM_MODULE_ENABLED */
+
+#ifdef HAL_UART_MODULE_ENABLED
+#include "py32f0xx_hal_uart.h"
+#endif /* HAL_UART_MODULE_ENABLED */
+
+#ifdef HAL_WWDG_MODULE_ENABLED
+#include "py32f0xx_hal_wwdg.h"
+#endif /* HAL_WWDG_MODULE_ENABLED */
+
+#ifdef HAL_LED_MODULE_ENABLED
+#include "py32f0xx_hal_led.h"
+#endif /* HAL_LED_MODULE_ENABLED */
+
+#ifdef HAL_USART_MODULE_ENABLED
+#include "py32f0xx_hal_usart.h"
+#endif /* HAL_USART_MODULE_ENABLED */
+
+/* Exported macro ------------------------------------------------------------*/
+#ifdef  USE_FULL_ASSERT
+/**
+* @brief  The assert_param macro is used for function's parameters check.
+* @param  expr: If expr is false, it calls assert_failed function
+*         which reports the name of the source file and the source
+*         line number of the call that failed.
+*         If expr is true, it returns no value.
+* @retval None
+*/
+#define assert_param(expr) ((expr) ? (void)0U : assert_failed((uint8_t *)__FILE__, __LINE__))
+/* Exported functions ------------------------------------------------------- */
+void assert_failed(uint8_t* file, uint32_t line);
+#else
+#define assert_param(expr) ((void)0U)
+#endif /* USE_FULL_ASSERT */
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* __PY32F0xx_HAL_CONF_H */
+
+/************************ (C) COPYRIGHT Puya *****END OF FILE******************/
diff --git a/include/py32f0xx_it.h b/include/py32f0xx_it.h
new file mode 100644
index 0000000..ed352e2
--- /dev/null
+++ b/include/py32f0xx_it.h
@@ -0,0 +1,51 @@
+/**
+  ******************************************************************************
+  * @file    py32f0xx_it.h
+  * @author  MCU Application Team
+  * @brief   This file contains the headers of the interrupt handlers.
+  ******************************************************************************
+  * @attention
+  *
+  * <h2><center>&copy; Copyright (c) Puya Semiconductor Co.
+  * All rights reserved.</center></h2>
+  *
+  * <h2><center>&copy; Copyright (c) 2016 STMicroelectronics.
+  * All rights reserved.</center></h2>
+  *
+  * This software component is licensed by ST under BSD 3-Clause license,
+  * the "License"; You may not use this file except in compliance with the
+  * License. You may obtain a copy of the License at:
+  *                        opensource.org/licenses/BSD-3-Clause
+  *
+  ******************************************************************************
+  */
+
+/* Define to prevent recursive inclusion -------------------------------------*/
+#ifndef __PY32F0XX_IT_H
+#define __PY32F0XX_IT_H
+
+#ifdef __cplusplus
+ extern "C" {
+#endif 
+
+/* Private includes ----------------------------------------------------------*/
+/* Exported types ------------------------------------------------------------*/
+/* Exported constants --------------------------------------------------------*/
+/* Exported macro ------------------------------------------------------------*/
+/* Exported functions prototypes ---------------------------------------------*/
+void NMI_Handler(void);
+void HardFault_Handler(void);
+void SVC_Handler(void);
+void PendSV_Handler(void);
+void SysTick_Handler(void);
+
+void USART1_IRQHandler(void);
+void USART2_IRQHandler(void);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* __PY32F0XX_IT_H */
+
+/************************ (C) COPYRIGHT Puya *****END OF FILE******************/
diff --git a/src/app_syscalls.c b/src/app_syscalls.c
new file mode 100644
index 0000000..8246fb4
--- /dev/null
+++ b/src/app_syscalls.c
@@ -0,0 +1,12 @@
+#include "main.h"
+
+void app_syscalls_init(void) {
+    huart1.Instance        = USART1;
+    huart1.Init.BaudRate   = 115200;
+    huart1.Init.WordLength = UART_WORDLENGTH_8B;
+    huart1.Init.StopBits   = UART_STOPBITS_1;
+    huart1.Init.Parity     = UART_PARITY_NONE;
+    huart1.Init.HwFlowCtl  = UART_HWCONTROL_NONE;
+    huart1.Init.Mode       = UART_MODE_TX_RX;
+    HAL_UART_Init(&huart1);
+}
\ No newline at end of file
diff --git a/src/main.c b/src/main.c
new file mode 100644
index 0000000..a08acee
--- /dev/null
+++ b/src/main.c
@@ -0,0 +1,19 @@
+#include <stdio.h>
+
+/* App */
+#include "app_syscalls.h"
+#include "main.h"
+
+UART_HandleTypeDef huart1;
+
+int main(void) {
+    HAL_Init();
+
+    app_syscalls_init();
+
+    printf("Hello world.\r\n");
+
+    for (;;) {
+        /* -- */
+    }
+}
\ No newline at end of file
diff --git a/src/py32f0xx_hal_msp.c b/src/py32f0xx_hal_msp.c
new file mode 100644
index 0000000..1e8afee
--- /dev/null
+++ b/src/py32f0xx_hal_msp.c
@@ -0,0 +1,69 @@
+/**
+  ******************************************************************************
+  * @file    py32f0xx_hal_msp.c
+  * @author  MCU Application Team
+  * @brief   This file provides code for the MSP Initialization
+  *          and de-Initialization codes.
+  ******************************************************************************
+  * @attention
+  *
+  * <h2><center>&copy; Copyright (c) Puya Semiconductor Co.
+  * All rights reserved.</center></h2>
+  *
+  * <h2><center>&copy; Copyright (c) 2016 STMicroelectronics.
+  * All rights reserved.</center></h2>
+  *
+  * This software component is licensed by ST under BSD 3-Clause license,
+  * the "License"; You may not use this file except in compliance with the
+  * License. You may obtain a copy of the License at:
+  *                        opensource.org/licenses/BSD-3-Clause
+  *
+  ******************************************************************************
+  */
+
+/* Includes ------------------------------------------------------------------*/
+#include "main.h"
+
+/* Private typedef -----------------------------------------------------------*/
+/* Private define ------------------------------------------------------------*/
+/* Private macro -------------------------------------------------------------*/
+/* Private variables ---------------------------------------------------------*/
+/* Private function prototypes -----------------------------------------------*/
+/* External functions --------------------------------------------------------*/
+
+/**
+  * @brief 初始化全局MSP
+  */
+void HAL_MspInit(void)
+{
+  __HAL_RCC_SYSCFG_CLK_ENABLE();
+  __HAL_RCC_PWR_CLK_ENABLE();
+}
+
+/**
+  * @brief 初始化USART的MSP
+  */
+void HAL_UART_MspInit(UART_HandleTypeDef *huart)
+{
+  /* 使能时钟 */
+  __HAL_RCC_USART2_CLK_ENABLE();
+  __HAL_RCC_GPIOA_CLK_ENABLE();
+
+  /**USART2引脚配置
+    PA9     ------> USART1_TX
+    PA10    ------> USART1_RX
+    */
+  GPIO_InitTypeDef  GPIO_InitStruct;
+  GPIO_InitStruct.Pin = GPIO_PIN_9 | GPIO_PIN_10;
+  GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
+  GPIO_InitStruct.Pull = GPIO_PULLUP;
+  GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_VERY_HIGH;
+  GPIO_InitStruct.Alternate = GPIO_AF4_USART2;
+  HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);
+
+  /* 使能NVIC */
+  HAL_NVIC_SetPriority(USART2_IRQn, 0, 1);
+  HAL_NVIC_EnableIRQ(USART2_IRQn);
+}
+
+/************************ (C) COPYRIGHT Puya *****END OF FILE******************/
diff --git a/src/py32f0xx_it.c b/src/py32f0xx_it.c
new file mode 100644
index 0000000..f81aec9
--- /dev/null
+++ b/src/py32f0xx_it.c
@@ -0,0 +1,92 @@
+/**
+  ******************************************************************************
+  * @file    py32f0xx_it.c
+  * @author  MCU Application Team
+  * @brief   Interrupt Service Routines.
+  ******************************************************************************
+  * @attention
+  *
+  * <h2><center>&copy; Copyright (c) Puya Semiconductor Co.
+  * All rights reserved.</center></h2>
+  *
+  * <h2><center>&copy; Copyright (c) 2016 STMicroelectronics.
+  * All rights reserved.</center></h2>
+  *
+  * This software component is licensed by ST under BSD 3-Clause license,
+  * the "License"; You may not use this file except in compliance with the
+  * License. You may obtain a copy of the License at:
+  *                        opensource.org/licenses/BSD-3-Clause
+  *
+  ******************************************************************************
+  */
+
+/* Includes ------------------------------------------------------------------*/
+#include "main.h"
+#include "py32f0xx_it.h"
+
+/* Private includes ----------------------------------------------------------*/
+/* Private typedef -----------------------------------------------------------*/
+/* Private define ------------------------------------------------------------*/
+/* Private macro -------------------------------------------------------------*/
+/* Private variables ---------------------------------------------------------*/
+/* Private function prototypes -----------------------------------------------*/
+/* Private user code ---------------------------------------------------------*/
+/* External variables --------------------------------------------------------*/
+
+/******************************************************************************/
+/*          Cortex-M0+ Processor Interruption and Exception Handlers          */
+/******************************************************************************/
+/**
+  * @brief This function handles Non maskable interrupt.
+  */
+void NMI_Handler(void)
+{
+}
+
+/**
+  * @brief This function handles Hard fault interrupt.
+  */
+void HardFault_Handler(void)
+{
+  while (1)
+  {
+  }
+}
+
+/**
+  * @brief This function handles System service call via SWI instruction.
+  */
+void SVC_Handler(void)
+{
+}
+
+/**
+  * @brief This function handles Pendable request for system service.
+  */
+void PendSV_Handler(void)
+{
+}
+
+/**
+  * @brief This function handles System tick timer.
+  */
+void SysTick_Handler(void)
+{
+  HAL_IncTick();
+}
+
+/******************************************************************************/
+/* PY32F0xx Peripheral Interrupt Handlers                                     */
+/* Add here the Interrupt Handlers for the used peripherals.                  */
+/* For the available peripheral interrupt handler names,                      */
+/* please refer to the startup file.                                          */
+/******************************************************************************/
+/**
+  * @brief This function handles USART1 Interrupt .
+  */
+void USART1_IRQHandler(void)
+{
+  HAL_UART_IRQHandler(&huart1);
+}
+
+/************************ (C) COPYRIGHT Puya *****END OF FILE******************/