STM32로 UART 통신을 하는 중에 질문이 있습니다.

#include "main.h"
#include <stdio.h>
 
UART_HandleTypeDef huart2;
 
void SystemClock_Config(void);
static void MX_GPIO_Init(void);
static void MX_USART2_UART_Init(void);
 
 
int main(void)
{
	HAL_Init();
	SystemClock_Config();
 
	MX_GPIO_Init();
  	MX_USB_HOST_Init();
  	MX_USART2_UART_Init();
 
	char data[] = "Hello, World!\r\n";
 
  	while (1)
  	{
		if (HAL_UART_Transmit(&huart2, (uint8_t*)data, 20, 100) == HAL_OK )
		{
			HAL_GPIO_TogglePin(BLUE_LED_GPIO_Port, BLUE_LED_Pin);
		}
	HAL_Delay(1000);
	}
}
 
 
 
static void MX_USART2_UART_Init(void)
{
	huart2.Instance = USART2;
	huart2.Init.BaudRate = 115200;
	huart2.Init.WordLength = UART_WORDLENGTH_8B;
	huart2.Init.StopBits = UART_STOPBITS_1;
	huart2.Init.Parity = UART_PARITY_NONE;
	huart2.Init.Mode = UART_MODE_TX_RX;
	huart2.Init.HwFlowCtl = UART_HWCONTROL_NONE;
	huart2.Init.OverSampling = UART_OVERSAMPLING_16;
	huart2.Init.OneBitSampling = UART_ONE_BIT_SAMPLE_DISABLE;
	huart2.AdvancedInit.AdvFeatureInit = UART_ADVFEATURE_NO_INIT;
	if (HAL_UART_Init(&huart2) != HAL_OK)
	{
		Error_Handler();
	}
}