Example USART from FW library

USART_InitTypeDef USART_InitStructure;   GPIO_InitTypeDef GPIO_InitStructure;   RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE); /* Enable GPIO A for USART2 Rx,Tx Pins */   RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART2, ENABLE); /* Enable USART2 Clock */   /* Configure USART2 Tx (PA.02) as alternate function push-pull */   GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2;   GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;   GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;   GPIO_Init(GPIOA, &GPIO_InitStructure);   /* Configure USART2 Rx (PA.03) as input floating */   GPIO_InitStructure.GPIO_Pin = GPIO_Pin_3;   GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;   GPIO_Init(GPIOA, &GPIO_InitStructure);   USART_InitStructure.USART_BaudRate            = 38400;   USART_InitStructure.USART_WordLength          = USART_WordLength_8b;   USART_InitStructure.USART_StopBits            = USART_StopBits_1;   USART_InitStructure.USART_Parity              = USART_Parity_No ;   USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;   USART_InitStructure.USART_Mode                = USART_Mode_Rx | USART_Mode_Tx;   USART_Init(USART2, &USART_InitStructure);   USART_Cmd(USART2, ENABLE);  /* Enable the USART */ .. See your other thread for string output code using the FW library void send_string(const char *s) {   while(*s)   {     while(USART_GetFlagStatus(USART2, USART_FLAG_TXE) == RESET);     USART_SendData(USART2, *s++);   } }