diff --git a/Examples/LL/GPIO/LED_Toggle/main.c b/Examples/LL/GPIO/LED_Toggle/main.c
index c4fa63d..a698dc3 100644
--- a/Examples/LL/GPIO/LED_Toggle/main.c
+++ b/Examples/LL/GPIO/LED_Toggle/main.c
@@ -20,30 +20,27 @@
   ******************************************************************************
   */
 
-/* Includes ------------------------------------------------------------------*/
 #include "main.h"
-#include "py32f0xx_bsp_led.h"
 #include "py32f0xx_bsp_printf.h"
 
-/* Private define ------------------------------------------------------------*/
-/* Private variables ---------------------------------------------------------*/
-/* Private user code ---------------------------------------------------------*/
-/* Private macro -------------------------------------------------------------*/
-/* Private function prototypes -----------------------------------------------*/
+
 static void APP_SystemClockConfig(void);
-static void APP_GpioConfig(void);
+static void APP_GPIOConfig(void);
 
 
 int main(void)
 {
   APP_SystemClockConfig();
+  APP_GPIOConfig();
 
-  APP_GpioConfig();
+  BSP_USART_Config(115200);
+  printf("PY32F0xx GPIO Example\r\nClock: %ld\r\n", SystemCoreClock);
 
   while (1)
   {
+    LL_GPIO_TogglePin(GPIOA, LL_GPIO_PIN_0);
+    printf("echo\r\n");
     LL_mDelay(500);
-    LL_GPIO_TogglePin(GPIOB,LL_GPIO_PIN_5);
   }
 }
 
@@ -61,15 +58,12 @@ static void APP_SystemClockConfig(void)
   LL_SetSystemCoreClock(8000000);
 }
 
-/**
-  * @brief  配置GPIO
-  * @param  无
-  * @retval 无
-  */
-static void APP_GpioConfig(void)
+
+static void APP_GPIOConfig(void)
 {
-  LL_IOP_GRP1_EnableClock(LL_IOP_GRP1_PERIPH_GPIOB);
-  LL_GPIO_SetPinMode(GPIOB, LL_GPIO_PIN_5, LL_GPIO_MODE_OUTPUT);
+  // PA0
+  LL_IOP_GRP1_EnableClock(LL_IOP_GRP1_PERIPH_GPIOA);
+  LL_GPIO_SetPinMode(GPIOA, LL_GPIO_PIN_0, LL_GPIO_MODE_OUTPUT);
 }
 
 void APP_ErrorHandler(void)
@@ -83,5 +77,3 @@ void assert_failed(uint8_t *file, uint32_t line)
   while (1);
 }
 #endif /* USE_FULL_ASSERT */
-
-/************************ (C) COPYRIGHT Puya *****END OF FILE******************/
diff --git a/Libraries/BSP_LL/Inc/py32f0xx_bsp_clock.h b/Libraries/BSP_LL/Inc/py32f0xx_bsp_clock.h
index e601be8..02ad61c 100644
--- a/Libraries/BSP_LL/Inc/py32f0xx_bsp_clock.h
+++ b/Libraries/BSP_LL/Inc/py32f0xx_bsp_clock.h
@@ -24,12 +24,15 @@ extern "C" {
 #include "py32f0xx_ll_gpio.h"
 #include "py32f0xx_ll_usart.h"
 
-void BSP_RCC_HSI_PLL48MConfig(void);
 void BSP_RCC_HSI_24MConfig(void);
 void BSP_RCC_HSI_8MConfig(void);
-void BSP_RCC_HSE_PLLConfig(void);
 void BSP_RCC_HSE_Config(void);
 
+#if defined(RCC_PLL_SUPPORT)
+void BSP_RCC_HSI_PLL48MConfig(void);
+void BSP_RCC_HSE_PLLConfig(void);
+#endif
+
 #ifdef __cplusplus
 }
 #endif
diff --git a/Libraries/BSP_LL/Inc/py32f0xx_bsp_printf.h b/Libraries/BSP_LL/Inc/py32f0xx_bsp_printf.h
index ea0dc68..dffcb4f 100644
--- a/Libraries/BSP_LL/Inc/py32f0xx_bsp_printf.h
+++ b/Libraries/BSP_LL/Inc/py32f0xx_bsp_printf.h
@@ -28,11 +28,9 @@ extern "C" {
 #include "py32f0xx_ll_usart.h"
 
 
-
-
 //debug printf redirect config
-#define DEBUG_USART                             USART2
-#define DEBUG_USART_CLK_ENABLE()                LL_APB1_GRP1_EnableClock(LL_APB1_GRP1_PERIPH_USART2)
+#define DEBUG_USART                             USART1
+#define DEBUG_USART_CLK_ENABLE()                LL_APB1_GRP2_EnableClock(LL_APB1_GRP2_PERIPH_USART1)
 
 #define __GPIOA_CLK_ENABLE()                    do { \
                                                      __IO uint32_t tmpreg = 0x00U; \
@@ -45,15 +43,15 @@ extern "C" {
 #define DEBUG_USART_RX_GPIO_PORT                GPIOA
 #define DEBUG_USART_RX_GPIO_CLK_ENABLE()        LL_IOP_GRP1_EnableClock(LL_IOP_GRP1_PERIPH_GPIOA)
 #define DEBUG_USART_RX_PIN                      LL_GPIO_PIN_3
-#define DEBUG_USART_RX_AF                       LL_GPIO_AF_4
+#define DEBUG_USART_RX_AF                       LL_GPIO_AF_1
 
 #define DEBUG_USART_TX_GPIO_PORT                GPIOA
 #define DEBUG_USART_TX_GPIO_CLK_ENABLE()        LL_IOP_GRP1_EnableClock(LL_IOP_GRP1_PERIPH_GPIOA)
 #define DEBUG_USART_TX_PIN                      LL_GPIO_PIN_2
-#define DEBUG_USART_TX_AF                       LL_GPIO_AF_4
+#define DEBUG_USART_TX_AF                       LL_GPIO_AF_1
 
-#define DEBUG_USART_IRQHandler                  USART2_IRQHandler
-#define DEBUG_USART_IRQ                         USART2_IRQn
+#define DEBUG_USART_IRQHandler                  USART1_IRQHandler
+#define DEBUG_USART_IRQ                         USART1_IRQn
 
 /************************************************************/
 
diff --git a/Libraries/BSP_LL/Src/py32f0xx_bsp_clock.c b/Libraries/BSP_LL/Src/py32f0xx_bsp_clock.c
index b3cde17..79c77e3 100644
--- a/Libraries/BSP_LL/Src/py32f0xx_bsp_clock.c
+++ b/Libraries/BSP_LL/Src/py32f0xx_bsp_clock.c
@@ -1,21 +1,5 @@
 #include "py32f0xx_bsp_clock.h"
 
-void BSP_RCC_HSI_PLL48MConfig(void)
-{
-  LL_UTILS_ClkInitTypeDef UTILS_ClkInitStruct;
-
-  LL_RCC_HSI_Enable();
-  /* Change this value to adjust clock frequency, larger is faster */
-  LL_RCC_HSI_SetCalibFreq(LL_RCC_HSICALIBRATION_24MHz);
-  while (LL_RCC_HSI_IsReady() != 1);
-
-  UTILS_ClkInitStruct.AHBCLKDivider = LL_RCC_SYSCLK_DIV_1;
-  UTILS_ClkInitStruct.APB1CLKDivider = LL_RCC_APB1_DIV_1;
-  LL_PLL_ConfigSystemClock_HSI(&UTILS_ClkInitStruct);
-
-  /* Re-init frequency of SysTick source, reload = freq/ticks = 48000000/1000 = 48000 */
-  LL_Init1msTick(48000000);
-}
 
 void BSP_RCC_HSI_24MConfig(void)
 {
@@ -52,21 +36,6 @@ void BSP_RCC_HSI_8MConfig(void)
   LL_Init1msTick(8000000);
 }
 
-void BSP_RCC_HSE_PLLConfig(void)
-{
-  LL_UTILS_ClkInitTypeDef UTILS_ClkInitStruct;
-
-  LL_RCC_HSE_Enable();
-  LL_RCC_HSE_SetFreqRegion(LL_RCC_HSE_16_32MHz);
-  while(LL_RCC_HSE_IsReady() != 1);
-
-  UTILS_ClkInitStruct.AHBCLKDivider = LL_RCC_SYSCLK_DIV_1;
-  UTILS_ClkInitStruct.APB1CLKDivider = LL_RCC_APB1_DIV_1;
-  LL_PLL_ConfigSystemClock_HSE(HSE_VALUE, LL_UTILS_HSEBYPASS_OFF, &UTILS_ClkInitStruct);
-  /* Re-init frequency of SysTick source */
-  LL_Init1msTick(HSE_VALUE * 2);
-}
-
 void BSP_RCC_HSE_Config(void)
 {
   LL_RCC_HSE_Enable();
@@ -84,3 +53,37 @@ void BSP_RCC_HSE_Config(void)
   /* Re-init frequency of SysTick source */
   LL_Init1msTick(HSE_VALUE);
 }
+
+#if defined(RCC_PLL_SUPPORT)
+void BSP_RCC_HSI_PLL48MConfig(void)
+{
+  LL_UTILS_ClkInitTypeDef UTILS_ClkInitStruct;
+
+  LL_RCC_HSI_Enable();
+  /* Change this value to adjust clock frequency, larger is faster */
+  LL_RCC_HSI_SetCalibFreq(LL_RCC_HSICALIBRATION_24MHz);
+  while (LL_RCC_HSI_IsReady() != 1);
+
+  UTILS_ClkInitStruct.AHBCLKDivider = LL_RCC_SYSCLK_DIV_1;
+  UTILS_ClkInitStruct.APB1CLKDivider = LL_RCC_APB1_DIV_1;
+  LL_PLL_ConfigSystemClock_HSI(&UTILS_ClkInitStruct);
+
+  /* Re-init frequency of SysTick source, reload = freq/ticks = 48000000/1000 = 48000 */
+  LL_Init1msTick(48000000);
+}
+
+void BSP_RCC_HSE_PLLConfig(void)
+{
+  LL_UTILS_ClkInitTypeDef UTILS_ClkInitStruct;
+
+  LL_RCC_HSE_Enable();
+  LL_RCC_HSE_SetFreqRegion(LL_RCC_HSE_16_32MHz);
+  while(LL_RCC_HSE_IsReady() != 1);
+
+  UTILS_ClkInitStruct.AHBCLKDivider = LL_RCC_SYSCLK_DIV_1;
+  UTILS_ClkInitStruct.APB1CLKDivider = LL_RCC_APB1_DIV_1;
+  LL_PLL_ConfigSystemClock_HSE(HSE_VALUE, LL_UTILS_HSEBYPASS_OFF, &UTILS_ClkInitStruct);
+  /* Re-init frequency of SysTick source */
+  LL_Init1msTick(HSE_VALUE * 2);
+}
+#endif
\ No newline at end of file