Hello I need a help with KEIL about USART(STM32)

void USART2_IRQHandler(void) 
{
    if ( USART_GetITStatus(USART2, USART_IT_RXNE) )
    {
        USART_ClearITPendingBit(USART2, USART_IT_RXNE);
        RX_buffer[RX_write] = USART_ReceiveData(USART2);
        RX_write++; //chetchik ukazatel na massive
        RX_ct++;
        if (RX_ct == 3)
        {
            if (RX_buffer[0] == 0x01) //ID
            {
                ID();
            }
        }
    }
}

void ID (uint8_t i) 
{
    while (!USART_GetFlagStatus(USART2, USART_SR_TXE))
    {
    }
    USART_SendData(USART2,i=10);
}