Usart stucks in While Loop STM32F407VG -> USART1 + USART3

I try to get data from stm32f407vg ,but stm32f407vg can not send any data.

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My configuration settings are here, I try to get data via PB6(pin source 6)

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void GPIO_Config()
{
  RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOB, ENABLE);//USART1
  RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOC, ENABLE);//USART3
  
  GPIO_PinAFConfig(GPIOB, GPIO_PinSource6, GPIO_AF_USART1);//TX
  
  GPIO_InitStruct.GPIO_Mode  = GPIO_Mode_AF            ;
  GPIO_InitStruct.GPIO_Pin   = GPIO_Pin_6              ;
  GPIO_InitStruct.GPIO_OType = GPIO_OType_PP           ;
  GPIO_InitStruct.GPIO_PuPd  = GPIO_PuPd_UP            ;
  GPIO_InitStruct.GPIO_Speed = GPIO_Speed_100MHz       ;
  GPIO_Init(GPIOB, &GPIO_InitStruct);
  
  GPIO_PinAFConfig(GPIOC, GPIO_PinSource10, GPIO_AF_USART3);//TX
  GPIO_PinAFConfig(GPIOC, GPIO_PinSource11, GPIO_AF_USART3);//RX
  
  GPIO_InitStruct.GPIO_Mode  = GPIO_Mode_AF             ;
  GPIO_InitStruct.GPIO_Pin   = GPIO_Pin_10 | GPIO_Pin_11;
  GPIO_InitStruct.GPIO_OType = GPIO_OType_PP            ;
  GPIO_InitStruct.GPIO_PuPd  = GPIO_PuPd_UP             ;
  GPIO_InitStruct.GPIO_Speed = GPIO_Speed_100MHz        ;
  GPIO_Init(GPIOC, &GPIO_InitStruct);
  
} 

void USART_Config()
{
  RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1, ENABLE);
  RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART3, ENABLE);
  
  USART_InitStruct.USART_BaudRate            = 9600               ;
  USART_InitStruct.USART_WordLength          = USART_WordLength_8b;
  USART_InitStruct.USART_StopBits            = USART_StopBits_1   ;
  USART_InitStruct.USART_Parity              = USART_Parity_No    ;
  USART_InitStruct.USART_Mode                = USART_Mode_Tx      ;
  USART_InitStruct.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
  USART_Init(USART1, &USART_InitStruct);
  
  USART_Cmd(USART1, ENABLE);
  
  USART_InitStruct.USART_BaudRate            = 115200                        ;
  USART_InitStruct.USART_WordLength          = USART_WordLength_8b           ;
  USART_InitStruct.USART_StopBits            = USART_StopBits_1              ;
  USART_InitStruct.USART_Parity              = USART_Parity_No               ;
  USART_InitStruct.USART_Mode                = USART_Mode_Tx | USART_Mode_Rx ;
  USART_InitStruct.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
  USART_Init(USART3, &USART_InitStruct);
  
  USART_Cmd(USART3, ENABLE);
  
  USART_ITConfig(USART3, USART_IT_RXNE, ENABLE);
}

void NVIC_Config()
{
  NVIC_InitStruct.NVIC_IRQChannel                   = USART3_IRQn ;
  NVIC_InitStruct.NVIC_IRQChannelPreemptionPriority = 0           ;
  NVIC_InitStruct.NVIC_IRQChannelSubPriority        = 0           ;
  NVIC_InitStruct.NVIC_IRQChannelCmd                = ENABLE      ;
  NVIC_Init(&NVIC_InitStruct);
}

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/It stucks at the mark/

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void USART_Puts(USART_TypeDef* USARTx, volatile char *s)
{     
  while(*s)
  {   
    while(!(USARTx -> SR & 0x00000040));//Bit 6 TC: Transmission Complete //<---IT IS STUCK
    USART_SendData(USARTx, *s);
    *s++;
  }
}

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I could not solve what the problem is..

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Could you help me?

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