diff --git a/myapps/practice/00-uart-tx/Makefile b/myapps/practice/00-uart-tx/Makefile
new file mode 100644
index 0000000..fb656c3
--- /dev/null
+++ b/myapps/practice/00-uart-tx/Makefile
@@ -0,0 +1,145 @@
+######################################
+# target
+######################################
+TARGET = stm32g0_blinky
+PART = STM32G030xx
+PYOCD_TARGET = stm32g030f6px
+
+
+######################################
+# building variables
+######################################
+# debug build?
+DEBUG = 1
+# optimization for size
+OPT = -Os
+
+
+#######################################
+# paths
+#######################################
+# Build path
+BUILD_DIR = build
+VND_DIR = ../../../vendor
+
+######################################
+# source
+######################################
+# C sources
+include hal.mk
+C_SOURCES += \
+$(VND_DIR)/STM32CubeG0/Drivers/CMSIS/Device/ST/STM32G0xx/Source/Templates/system_stm32g0xx.c \
+src/main.c
+
+
+# ASM sources
+ASM_SOURCES =  \
+$(VND_DIR)/STM32CubeG0/Drivers/CMSIS/Device/ST/STM32G0xx/Source/Templates/gcc/startup_stm32g030xx.s
+
+#######################################
+# binaries
+#######################################
+PREFIX = arm-none-eabi-
+
+CC = $(PREFIX)gcc
+CP = $(PREFIX)objcopy
+#SZ = $(PREFIX)size
+
+BIN = $(CP) -O binary -S
+
+#######################################
+# CFLAGS
+#######################################
+# cpu
+CPU = \
+ -mcpu=cortex-m0plus \
+ -mthumb
+
+DEFINES = -D$(PART)
+
+# fpu
+FPU = 
+
+# float-abi
+FLOAT-ABI =
+
+# mcu
+MCU = $(CPU) $(FPU) $(FLOAT-ABI)
+
+# C includes
+C_INCLUDES +=  \
+ -Isrc/inc \
+ -I$(VND_DIR)/STM32CubeG0/Drivers/CMSIS/Core/Include \
+ -I$(VND_DIR)/STM32CubeG0/Drivers/CMSIS/Device/ST/STM32G0xx/Include
+
+# compile gcc flags
+ADDN_CFLAGS = \
+ -Wall \
+ -fno-common \
+ -fdata-sections \
+ -ffunction-sections
+
+CFLAGS = $(MCU) $(ADDN_CFLAGS) $(C_INCLUDES) $(OPT) $(DEFINES)
+
+ifeq ($(DEBUG), 1)
+CFLAGS += -ggdb3
+endif
+
+
+# Generate dependency information
+#CFLAGS += -MMD -MP -MF"$(@:%.o=%.d)"
+
+
+#######################################
+# LDFLAGS
+#######################################
+# link script
+LDSCRIPT = $(VND_DIR)/Ld/STM32G030F6MX_FLASH.ld
+
+LIBDIR = 
+LDFLAGS =  \
+ $(MCU)  \
+ -T $(LDSCRIPT) \
+ --specs=nano.specs \
+ -Wl,--gc-sections \
+ -Wl,--print-memory-usage \
+ -Wl,--no-warn-rwx-segments
+
+# default action: build all
+all: $(BUILD_DIR)/$(TARGET).elf $(BUILD_DIR)/$(TARGET).bin
+
+
+#######################################
+# build the application
+#######################################
+# list of objects
+OBJECTS = $(addprefix $(BUILD_DIR)/,$(notdir $(C_SOURCES:.c=.o)))
+vpath %.c $(sort $(dir $(C_SOURCES)))
+
+$(BUILD_DIR)/%.o: %.c Makefile | $(BUILD_DIR)
+	$(CC) -c $(CFLAGS) -Wa,-a,-ad,-alms=$(BUILD_DIR)/$(notdir $(<:.c=.lst)) $< -o $@
+
+#$(LUAOBJECTS) $(OBJECTS)
+$(BUILD_DIR)/$(TARGET).elf: $(OBJECTS) Makefile
+	$(CC) $(OBJECTS) $(LDFLAGS) $(ASM_SOURCES) -o $@
+
+$(BUILD_DIR)/%.bin: $(BUILD_DIR)/%.elf | $(BUILD_DIR)
+	$(BIN) $< $@	
+	
+$(BUILD_DIR):
+	mkdir $@		
+
+#######################################
+# Program
+#######################################
+
+flash: $(BUILD_DIR)/$(TARGET).bin
+	pyocd load --target $(PYOCD_TARGET) $(BUILD_DIR)/$(TARGET).bin
+
+#######################################
+# clean up
+#######################################
+clean:
+	-rm -fR $(BUILD_DIR)
+  
+# *** EOF ***
diff --git a/myapps/practice/00-uart-tx/hal.mk b/myapps/practice/00-uart-tx/hal.mk
new file mode 100644
index 0000000..62dacbf
--- /dev/null
+++ b/myapps/practice/00-uart-tx/hal.mk
@@ -0,0 +1,20 @@
+C_INCLUDES += \
+ -I$(VND_DIR)/STM32CubeG0/Drivers/STM32G0xx_HAL_Driver/Inc
+
+
+C_SOURCES += \
+ $(VND_DIR)/STM32CubeG0/Drivers/STM32G0xx_HAL_Driver/Src/stm32g0xx_hal.c \
+ $(VND_DIR)/STM32CubeG0/Drivers/STM32G0xx_HAL_Driver/Src/stm32g0xx_hal_cortex.c \
+ $(VND_DIR)/STM32CubeG0/Drivers/STM32G0xx_HAL_Driver/Src/stm32g0xx_hal_pwr.c \
+ $(VND_DIR)/STM32CubeG0/Drivers/STM32G0xx_HAL_Driver/Src/stm32g0xx_hal_pwr_ex.c \
+ $(VND_DIR)/STM32CubeG0/Drivers/STM32G0xx_HAL_Driver/Src/stm32g0xx_hal_rcc.c \
+ $(VND_DIR)/STM32CubeG0/Drivers/STM32G0xx_HAL_Driver/Src/stm32g0xx_hal_rcc_ex.c \
+ $(VND_DIR)/STM32CubeG0/Drivers/STM32G0xx_HAL_Driver/Src/stm32g0xx_hal_exti.c \
+ $(VND_DIR)/STM32CubeG0/Drivers/STM32G0xx_HAL_Driver/Src/stm32g0xx_hal_dma.c \
+ $(VND_DIR)/STM32CubeG0/Drivers/STM32G0xx_HAL_Driver/Src/stm32g0xx_hal_dma_ex.c \
+ $(VND_DIR)/STM32CubeG0/Drivers/STM32G0xx_HAL_Driver/Src/stm32g0xx_hal_flash.c \
+ $(VND_DIR)/STM32CubeG0/Drivers/STM32G0xx_HAL_Driver/Src/stm32g0xx_hal_flash_ex.c \
+ $(VND_DIR)/STM32CubeG0/Drivers/STM32G0xx_HAL_Driver/Src/stm32g0xx_hal_gpio.c \
+ $(VND_DIR)/STM32CubeG0/Drivers/STM32G0xx_HAL_Driver/Src/stm32g0xx_hal_uart.c \
+ src/stm32g0xx_hal_msp.c
+
diff --git a/myapps/practice/00-uart-tx/src/inc/stm32g0xx_hal_conf.h b/myapps/practice/00-uart-tx/src/inc/stm32g0xx_hal_conf.h
new file mode 100644
index 0000000..939a670
--- /dev/null
+++ b/myapps/practice/00-uart-tx/src/inc/stm32g0xx_hal_conf.h
@@ -0,0 +1,351 @@
+/* USER CODE BEGIN Header */
+/**
+  ******************************************************************************
+  * @file    stm32g0xx_hal_conf.h
+  * @author  MCD Application Team
+  * @brief   HAL configuration file.
+  ******************************************************************************
+  * @attention
+  *
+  * Copyright (c) 2018-2020 STMicroelectronics.
+  * All rights reserved.
+  *
+  * This software is licensed under terms that can be found in the LICENSE file
+  * in the root directory of this software component.
+  * If no LICENSE file comes with this software, it is provided AS-IS.
+  *
+  ******************************************************************************
+  */
+/* USER CODE END Header */
+
+/* Define to prevent recursive inclusion -------------------------------------*/
+#ifndef STM32G0xx_HAL_CONF_H
+#define STM32G0xx_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_ADC_MODULE_ENABLED   */
+/* #define HAL_CEC_MODULE_ENABLED   */
+/* #define HAL_COMP_MODULE_ENABLED   */
+/* #define HAL_CRC_MODULE_ENABLED   */
+/* #define HAL_CRYP_MODULE_ENABLED   */
+/* #define HAL_DAC_MODULE_ENABLED   */
+/* #define HAL_EXTI_MODULE_ENABLED   */
+/* #define HAL_FDCAN_MODULE_ENABLED   */
+/* #define HAL_HCD_MODULE_ENABLED   */
+/* #define HAL_I2C_MODULE_ENABLED   */
+/* #define HAL_I2S_MODULE_ENABLED   */
+/* #define HAL_IWDG_MODULE_ENABLED   */
+/* #define HAL_IRDA_MODULE_ENABLED   */
+/* #define HAL_LPTIM_MODULE_ENABLED   */
+/* #define HAL_PCD_MODULE_ENABLED   */
+/* #define HAL_RNG_MODULE_ENABLED   */
+/* #define HAL_RTC_MODULE_ENABLED   */
+/* #define HAL_SMARTCARD_MODULE_ENABLED   */
+/* #define HAL_SMBUS_MODULE_ENABLED   */
+/* #define HAL_SPI_MODULE_ENABLED   */
+/* #define HAL_TIM_MODULE_ENABLED   */
+#define HAL_UART_MODULE_ENABLED
+/* #define HAL_USART_MODULE_ENABLED   */
+/* #define HAL_WWDG_MODULE_ENABLED   */
+#define HAL_GPIO_MODULE_ENABLED
+#define HAL_EXTI_MODULE_ENABLED
+#define HAL_DMA_MODULE_ENABLED
+#define HAL_RCC_MODULE_ENABLED
+#define HAL_FLASH_MODULE_ENABLED
+#define HAL_PWR_MODULE_ENABLED
+#define HAL_CORTEX_MODULE_ENABLED
+
+/* ########################## Register Callbacks selection ############################## */
+/**
+  * @brief This is the list of modules where register callback can be used
+  */
+#define USE_HAL_ADC_REGISTER_CALLBACKS    0u
+#define USE_HAL_CEC_REGISTER_CALLBACKS    0u
+#define USE_HAL_COMP_REGISTER_CALLBACKS   0u
+#define USE_HAL_CRYP_REGISTER_CALLBACKS   0u
+#define USE_HAL_DAC_REGISTER_CALLBACKS    0u
+#define USE_HAL_FDCAN_REGISTER_CALLBACKS  0u
+#define USE_HAL_HCD_REGISTER_CALLBACKS    0u
+#define USE_HAL_I2C_REGISTER_CALLBACKS    0u
+#define USE_HAL_I2S_REGISTER_CALLBACKS    0u
+#define USE_HAL_IRDA_REGISTER_CALLBACKS   0u
+#define USE_HAL_LPTIM_REGISTER_CALLBACKS  0u
+#define USE_HAL_PCD_REGISTER_CALLBACKS    0u
+#define USE_HAL_RNG_REGISTER_CALLBACKS    0u
+#define USE_HAL_RTC_REGISTER_CALLBACKS    0u
+#define USE_HAL_SMBUS_REGISTER_CALLBACKS  0u
+#define USE_HAL_SPI_REGISTER_CALLBACKS    0u
+#define USE_HAL_TIM_REGISTER_CALLBACKS    0u
+#define USE_HAL_UART_REGISTER_CALLBACKS   0u
+#define USE_HAL_USART_REGISTER_CALLBACKS  0u
+#define USE_HAL_WWDG_REGISTER_CALLBACKS   0u
+
+/* ########################## Oscillator Values adaptation ####################*/
+/**
+  * @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
+  *        (when HSE is used as system clock source, directly or through the PLL).
+  */
+#if !defined  (HSE_VALUE)
+#define HSE_VALUE    (8000000UL)         /*!< Value of the External oscillator in Hz */
+#endif /* HSE_VALUE */
+
+#if !defined  (HSE_STARTUP_TIMEOUT)
+#define HSE_STARTUP_TIMEOUT    (100UL)         /*!< Time out for HSE start up, in ms */
+#endif /* HSE_STARTUP_TIMEOUT */
+
+/**
+  * @brief Internal High Speed oscillator (HSI) value.
+  *        This value is used by the RCC HAL module to compute the system frequency
+  *        (when HSI is used as system clock source, directly or through the PLL).
+  */
+#if !defined  (HSI_VALUE)
+#define HSI_VALUE    (16000000UL)            /*!< Value of the Internal oscillator in Hz*/
+#endif /* HSI_VALUE */
+
+#if defined(STM32G0C1xx) || defined(STM32G0B1xx) || defined(STM32G0B0xx)
+/**
+  * @brief Internal High Speed oscillator (HSI48) value for USB FS, SDMMC and RNG.
+  *        This internal oscillator is mainly dedicated to provide a high precision clock to
+  *        the USB peripheral by means of a special Clock Recovery System (CRS) circuitry.
+  *        When the CRS is not used, the HSI48 RC oscillator runs on it default frequency
+  *        which is subject to manufacturing process variations.
+  */
+#if !defined  (HSI48_VALUE)
+  #define HSI48_VALUE   48000000U             /*!< Value of the Internal High Speed oscillator for USB FS/SDMMC/RNG in Hz.
+                                               The real value my vary depending on manufacturing process variations.*/
+#endif /* HSI48_VALUE */
+#endif
+
+/**
+  * @brief Internal Low Speed oscillator (LSI) value.
+  */
+#if !defined  (LSI_VALUE)
+#define LSI_VALUE  (32000UL)                /*!< 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 External Low Speed oscillator (LSE) value.
+  *        This value is used by the UART, RTC HAL module to compute the system frequency
+  */
+#if !defined  (LSE_VALUE)
+#define LSE_VALUE    (32768UL)               /*!< Value of the External oscillator in Hz*/
+#endif /* LSE_VALUE */
+
+#if !defined  (LSE_STARTUP_TIMEOUT)
+#define LSE_STARTUP_TIMEOUT    (5000UL)      /*!< Time out for LSE start up, in ms */
+#endif /* LSE_STARTUP_TIMEOUT */
+
+/**
+  * @brief External clock source for I2S1 peripheral
+  *        This value is used by the RCC HAL module to compute the I2S1 clock source
+  *        frequency.
+  */
+#if !defined  (EXTERNAL_I2S1_CLOCK_VALUE)
+#define EXTERNAL_I2S1_CLOCK_VALUE    (48000UL) /*!< Value of the I2S1 External clock source in Hz*/
+#endif /* EXTERNAL_I2S1_CLOCK_VALUE */
+
+#if defined(STM32G0C1xx) || defined(STM32G0B1xx) || defined(STM32G0B0xx)
+/**
+  * @brief External clock source for I2S2 peripheral
+  *        This value is used by the RCC HAL module to compute the I2S2 clock source
+  *        frequency.
+  */
+#if !defined  (EXTERNAL_I2S2_CLOCK_VALUE)
+  #define EXTERNAL_I2S2_CLOCK_VALUE    48000U /*!< Value of the I2S2 External clock source in Hz*/
+#endif /* EXTERNAL_I2S2_CLOCK_VALUE */
+#endif
+
+/* 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                    (3300UL)                                        /*!< Value of VDD in mv */
+#define  TICK_INT_PRIORITY            0U /*!< tick interrupt priority */
+#define  USE_RTOS                     0U
+#define  PREFETCH_ENABLE              1U
+#define  INSTRUCTION_CACHE_ENABLE     1U
+
+/* ################## SPI peripheral configuration ########################## */
+
+/* CRC FEATURE: Use to activate CRC feature inside HAL SPI Driver
+* Activated: CRC code is present inside driver
+* Deactivated: CRC code cleaned from driver
+*/
+
+#define USE_SPI_CRC                     0U
+
+/* ################## CRYP peripheral configuration ########################## */
+
+#define USE_HAL_CRYP_SUSPEND_RESUME     1U
+
+/* ########################## 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 modules header file
+  */
+
+#ifdef HAL_RCC_MODULE_ENABLED
+#include "stm32g0xx_hal_rcc.h"
+#endif /* HAL_RCC_MODULE_ENABLED */
+
+#ifdef HAL_GPIO_MODULE_ENABLED
+#include "stm32g0xx_hal_gpio.h"
+#endif /* HAL_GPIO_MODULE_ENABLED */
+
+#ifdef HAL_DMA_MODULE_ENABLED
+#include "stm32g0xx_hal_dma.h"
+#endif /* HAL_DMA_MODULE_ENABLED */
+
+#ifdef HAL_CORTEX_MODULE_ENABLED
+#include "stm32g0xx_hal_cortex.h"
+#endif /* HAL_CORTEX_MODULE_ENABLED */
+
+#ifdef HAL_ADC_MODULE_ENABLED
+#include "stm32g0xx_hal_adc.h"
+#include "stm32g0xx_hal_adc_ex.h"
+#endif /* HAL_ADC_MODULE_ENABLED */
+
+#ifdef HAL_CEC_MODULE_ENABLED
+#include "stm32g0xx_hal_cec.h"
+#endif /* HAL_CEC_MODULE_ENABLED */
+
+#ifdef HAL_COMP_MODULE_ENABLED
+#include "stm32g0xx_hal_comp.h"
+#endif /* HAL_COMP_MODULE_ENABLED */
+
+#ifdef HAL_CRC_MODULE_ENABLED
+#include "stm32g0xx_hal_crc.h"
+#endif /* HAL_CRC_MODULE_ENABLED */
+
+#ifdef HAL_CRYP_MODULE_ENABLED
+#include "stm32g0xx_hal_cryp.h"
+#endif /* HAL_CRYP_MODULE_ENABLED */
+
+#ifdef HAL_DAC_MODULE_ENABLED
+#include "stm32g0xx_hal_dac.h"
+#endif /* HAL_DAC_MODULE_ENABLED */
+
+#ifdef HAL_EXTI_MODULE_ENABLED
+#include "stm32g0xx_hal_exti.h"
+#endif /* HAL_EXTI_MODULE_ENABLED */
+
+#ifdef HAL_FLASH_MODULE_ENABLED
+#include "stm32g0xx_hal_flash.h"
+#endif /* HAL_FLASH_MODULE_ENABLED */
+
+#ifdef HAL_FDCAN_MODULE_ENABLED
+#include "stm32g0xx_hal_fdcan.h"
+#endif /* HAL_FDCAN_MODULE_ENABLED */
+
+#ifdef HAL_HCD_MODULE_ENABLED
+#include "stm32g0xx_hal_hcd.h"
+#endif /* HAL_HCD_MODULE_ENABLED */
+
+#ifdef HAL_I2C_MODULE_ENABLED
+#include "stm32g0xx_hal_i2c.h"
+#endif /* HAL_I2C_MODULE_ENABLED */
+
+#ifdef HAL_I2S_MODULE_ENABLED
+#include "stm32g0xx_hal_i2s.h"
+#endif /* HAL_I2S_MODULE_ENABLED */
+
+#ifdef HAL_IRDA_MODULE_ENABLED
+#include "stm32g0xx_hal_irda.h"
+#endif /* HAL_IRDA_MODULE_ENABLED */
+
+#ifdef HAL_IWDG_MODULE_ENABLED
+#include "stm32g0xx_hal_iwdg.h"
+#endif /* HAL_IWDG_MODULE_ENABLED */
+
+#ifdef HAL_LPTIM_MODULE_ENABLED
+#include "stm32g0xx_hal_lptim.h"
+#endif /* HAL_LPTIM_MODULE_ENABLED */
+
+#ifdef HAL_PCD_MODULE_ENABLED
+#include "stm32g0xx_hal_pcd.h"
+#endif /* HAL_PCD_MODULE_ENABLED */
+
+#ifdef HAL_PWR_MODULE_ENABLED
+#include "stm32g0xx_hal_pwr.h"
+#endif /* HAL_PWR_MODULE_ENABLED */
+
+#ifdef HAL_RNG_MODULE_ENABLED
+#include "stm32g0xx_hal_rng.h"
+#endif /* HAL_RNG_MODULE_ENABLED */
+
+#ifdef HAL_RTC_MODULE_ENABLED
+#include "stm32g0xx_hal_rtc.h"
+#endif /* HAL_RTC_MODULE_ENABLED */
+
+#ifdef HAL_SMARTCARD_MODULE_ENABLED
+#include "stm32g0xx_hal_smartcard.h"
+#endif /* HAL_SMARTCARD_MODULE_ENABLED */
+
+#ifdef HAL_SMBUS_MODULE_ENABLED
+#include "stm32g0xx_hal_smbus.h"
+#endif /* HAL_SMBUS_MODULE_ENABLED */
+
+#ifdef HAL_SPI_MODULE_ENABLED
+#include "stm32g0xx_hal_spi.h"
+#endif /* HAL_SPI_MODULE_ENABLED */
+
+#ifdef HAL_TIM_MODULE_ENABLED
+#include "stm32g0xx_hal_tim.h"
+#endif /* HAL_TIM_MODULE_ENABLED */
+
+#ifdef HAL_UART_MODULE_ENABLED
+#include "stm32g0xx_hal_uart.h"
+#endif /* HAL_UART_MODULE_ENABLED */
+
+#ifdef HAL_USART_MODULE_ENABLED
+#include "stm32g0xx_hal_usart.h"
+#endif /* HAL_USART_MODULE_ENABLED */
+
+#ifdef HAL_WWDG_MODULE_ENABLED
+#include "stm32g0xx_hal_wwdg.h"
+#endif /* HAL_WWDG_MODULE_ENABLED */
+
+/* Exported macro ------------------------------------------------------------*/
+#ifdef  USE_FULL_ASSERT
+/**
+  * @brief  The assert_param macro is used for functions 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 /* STM32G0xx_HAL_CONF_H */
diff --git a/myapps/practice/00-uart-tx/src/inc/stm32g0xx_hal_msp.h b/myapps/practice/00-uart-tx/src/inc/stm32g0xx_hal_msp.h
new file mode 100644
index 0000000..944cb6f
--- /dev/null
+++ b/myapps/practice/00-uart-tx/src/inc/stm32g0xx_hal_msp.h
@@ -0,0 +1,12 @@
+
+#include "stm32g0xx_hal.h"
+
+
+void SystemClock_Config(void);
+
+/*
+ * Other functions (already defined weak in HAL):
+ * HAL_MspInit(void)
+ * void SysTick_Handler(void)
+ */
+
diff --git a/myapps/practice/00-uart-tx/src/main.c b/myapps/practice/00-uart-tx/src/main.c
new file mode 100644
index 0000000..98205be
--- /dev/null
+++ b/myapps/practice/00-uart-tx/src/main.c
@@ -0,0 +1,50 @@
+// Tx/Rx: PA09[PA11]/PA10[PA12]
+
+//#include <string.h>
+#include "stm32g0xx_hal_msp.h"
+
+UART_HandleTypeDef huart1;
+
+char buffer[] = "Hello World\r\n";
+#define TXBUFFERSIZE  14    //strlen(buffer)
+#define TIMEOUT 1000        //right val?
+
+static void uart_init(void)
+{
+
+  /* USER CODE BEGIN USART1_Init 0 */
+
+  /* USER CODE END USART1_Init 0 */
+
+  /* USER CODE BEGIN USART1_Init 1 */
+
+  /* USER CODE END USART1_Init 1 */
+  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.Mode = UART_MODE_TX_RX;
+  huart1.Init.HwFlowCtl = UART_HWCONTROL_NONE;
+  huart1.Init.OverSampling = UART_OVERSAMPLING_16;
+  huart1.Init.OneBitSampling = UART_ONE_BIT_SAMPLE_DISABLE;
+  huart1.Init.ClockPrescaler = UART_PRESCALER_DIV1;
+  huart1.AdvancedInit.AdvFeatureInit = UART_ADVFEATURE_NO_INIT;
+  while (HAL_UART_Init(&huart1) != HAL_OK);
+
+}
+
+
+int main(void)
+{
+  HAL_Init();
+  SystemClock_Config();
+  uart_init();
+  
+  while(1)
+  {
+    HAL_UART_Transmit(&huart1, (uint8_t *)buffer, TXBUFFERSIZE, TIMEOUT);
+    HAL_Delay(100);
+  }
+}
+
diff --git a/myapps/practice/00-uart-tx/src/stm32g0xx_hal_msp.c b/myapps/practice/00-uart-tx/src/stm32g0xx_hal_msp.c
new file mode 100644
index 0000000..1c66708
--- /dev/null
+++ b/myapps/practice/00-uart-tx/src/stm32g0xx_hal_msp.c
@@ -0,0 +1,107 @@
+
+#include "stm32g0xx_hal_msp.h"
+
+void HAL_MspInit(void)
+{
+  /* USER CODE BEGIN MspInit 0 */
+
+  /* USER CODE END MspInit 0 */
+
+  __HAL_RCC_SYSCFG_CLK_ENABLE();
+  __HAL_RCC_PWR_CLK_ENABLE();
+
+  /* System interrupt init*/
+
+  HAL_SYSCFG_EnableRemap(SYSCFG_REMAP_PA11);
+  HAL_SYSCFG_EnableRemap(SYSCFG_REMAP_PA12);
+
+  /* USER CODE BEGIN MspInit 1 */
+
+  /* USER CODE END MspInit 1 */
+}
+
+void HAL_UART_MspInit(UART_HandleTypeDef* huart)
+{
+  GPIO_InitTypeDef GPIO_InitStruct = {0};
+  RCC_PeriphCLKInitTypeDef PeriphClkInit = {0};
+  if(huart->Instance==USART1)
+  {
+    PeriphClkInit.PeriphClockSelection = RCC_PERIPHCLK_USART1;
+    PeriphClkInit.Usart1ClockSelection = RCC_USART1CLKSOURCE_PCLK1;
+    while (HAL_RCCEx_PeriphCLKConfig(&PeriphClkInit) != HAL_OK);
+    
+    __HAL_RCC_USART1_CLK_ENABLE();
+    __HAL_RCC_GPIOA_CLK_ENABLE();
+    
+    GPIO_InitStruct.Pin = GPIO_PIN_9|GPIO_PIN_10;   // both push/pull??
+    GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
+    GPIO_InitStruct.Pull = GPIO_PULLUP;
+    GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
+    GPIO_InitStruct.Alternate = GPIO_AF1_USART1;
+    HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);
+  }
+}
+
+void SysTick_Handler(void)
+{
+  HAL_IncTick();
+}
+
+void Error_Handler(void)
+{
+  /* USER CODE BEGIN Error_Handler_Debug */
+  /* User can add his own implementation to report the HAL error return state */
+  __disable_irq();
+  while (1)
+  {
+  }
+  /* USER CODE END Error_Handler_Debug */
+}
+
+void SystemClock_Config(void)
+{
+  RCC_OscInitTypeDef RCC_OscInitStruct = {0};
+  RCC_ClkInitTypeDef RCC_ClkInitStruct = {0};
+
+  /** Configure the main internal regulator output voltage
+  */
+  HAL_PWREx_ControlVoltageScaling(PWR_REGULATOR_VOLTAGE_SCALE1);
+
+  /** Configure LSE Drive Capability
+  */
+  HAL_PWR_EnableBkUpAccess();
+  __HAL_RCC_LSEDRIVE_CONFIG(RCC_LSEDRIVE_LOW);
+
+  /** Initializes the RCC Oscillators according to the specified parameters
+  * in the RCC_OscInitTypeDef structure.
+  */
+  RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSI|RCC_OSCILLATORTYPE_LSE;
+  RCC_OscInitStruct.LSEState = RCC_LSE_ON;
+  RCC_OscInitStruct.HSIState = RCC_HSI_ON;
+  RCC_OscInitStruct.HSIDiv = RCC_HSI_DIV1;
+  RCC_OscInitStruct.HSICalibrationValue = RCC_HSICALIBRATION_DEFAULT;
+  RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;
+  RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSI;
+  RCC_OscInitStruct.PLL.PLLM = RCC_PLLM_DIV1;
+  RCC_OscInitStruct.PLL.PLLN = 8;
+  RCC_OscInitStruct.PLL.PLLP = RCC_PLLP_DIV2;
+  RCC_OscInitStruct.PLL.PLLR = RCC_PLLR_DIV2;
+  if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK)
+  {
+    Error_Handler();
+  }
+
+  /** Initializes the CPU, AHB and APB buses clocks
+  */
+  RCC_ClkInitStruct.ClockType = RCC_CLOCKTYPE_HCLK|RCC_CLOCKTYPE_SYSCLK
+                              |RCC_CLOCKTYPE_PCLK1;
+  RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_PLLCLK;
+  RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1;
+  RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV1;
+
+  if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_2) != HAL_OK)
+  {
+    Error_Handler();
+  }
+}
+