diff --git a/Examples/LL/RCC/RCC_PLL_Output/main.c b/Examples/LL/RCC/RCC_PLL_Output/main.c
index 95da8e7..5733c08 100644
--- a/Examples/LL/RCC/RCC_PLL_Output/main.c
+++ b/Examples/LL/RCC/RCC_PLL_Output/main.c
@@ -1,6 +1,4 @@
 #include "main.h"
-#include "py32f0xx_bsp_button.h"
-#include "py32f0xx_bsp_led.h"
 #include "py32f0xx_bsp_printf.h"
 
 static void APP_SystemClockConfig(void);
@@ -12,12 +10,17 @@ int main(void)
 
   APP_GPIOConfig();
 
+  BSP_USART_Config(115200);
+
   LL_RCC_ConfigMCO(LL_RCC_MCO1SOURCE_SYSCLK,LL_RCC_MCO1_DIV_1);
 
+  printf("Clock: %ld \r\n", SystemCoreClock);
+
   while (1)
   {
-    LL_mDelay(200);
+    LL_mDelay(1000);
     LL_GPIO_TogglePin(GPIOB,LL_GPIO_PIN_5);
+    printf("echo\r\n");
   }
 }
 
@@ -26,7 +29,8 @@ static void APP_SystemClockConfig(void)
   LL_UTILS_ClkInitTypeDef UTILS_ClkInitStruct;
 
   LL_RCC_HSI_Enable();
-  LL_RCC_HSI_SetCalibFreq(LL_RCC_HSICALIBRATION_24MHz);
+  /* Change this value to adjust frequency */
+  LL_RCC_HSI_SetCalibFreq(LL_RCC_HSICALIBRATION_24MHz + 15);
   while(LL_RCC_HSI_IsReady() != 1);
 
   UTILS_ClkInitStruct.AHBCLKDivider = LL_RCC_SYSCLK_DIV_1;
diff --git a/Libraries/BSP_LL/Inc/py32f0xx_bsp_printf.h b/Libraries/BSP_LL/Inc/py32f0xx_bsp_printf.h
index 1ef360e..4e8d6e4 100644
--- a/Libraries/BSP_LL/Inc/py32f0xx_bsp_printf.h
+++ b/Libraries/BSP_LL/Inc/py32f0xx_bsp_printf.h
@@ -31,8 +31,6 @@ extern "C" {
 
 
 //debug printf redirect config
-#define DEBUG_USART_BAUDRATE                    115200
-
 #define DEBUG_USART                             USART2
 #define DEBUG_USART_CLK_ENABLE()                LL_APB1_GRP1_EnableClock(LL_APB1_GRP1_PERIPH_USART2)
 
@@ -59,7 +57,7 @@ extern "C" {
 
 /************************************************************/
 
-void             BSP_USART_Config(void);
+void             BSP_USART_Config(uint32_t baudRate);
 
 
 #ifdef __cplusplus
diff --git a/Libraries/BSP_LL/Src/py32f0xx_bsp_printf.c b/Libraries/BSP_LL/Src/py32f0xx_bsp_printf.c
index 80dc6d8..778ab02 100644
--- a/Libraries/BSP_LL/Src/py32f0xx_bsp_printf.c
+++ b/Libraries/BSP_LL/Src/py32f0xx_bsp_printf.c
@@ -8,12 +8,12 @@
   * @param  None
   * @retval None
   */
-void BSP_USART_Config(void)
+void BSP_USART_Config(uint32_t baudRate)
 {
   DEBUG_USART_CLK_ENABLE();
 
   /* USART Init */
-  LL_USART_SetBaudRate(DEBUG_USART, SystemCoreClock, LL_USART_OVERSAMPLING_16, DEBUG_USART_BAUDRATE);
+  LL_USART_SetBaudRate(DEBUG_USART, SystemCoreClock, LL_USART_OVERSAMPLING_16, baudRate);
   LL_USART_SetDataWidth(DEBUG_USART, LL_USART_DATAWIDTH_8B);
   LL_USART_SetStopBitsLength(DEBUG_USART, LL_USART_STOPBITS_1);
   LL_USART_SetParity(DEBUG_USART, LL_USART_PARITY_NONE);