STM32下串口的使用

STM32下关于串口的固件库写得相当好了，以下只是本文对串口库的一点点封装：

/*HKY_uart.h*/#ifndef _HKY_UART_H_#define _HKY_UART_H_#include "stm32f10x_lib.h"//#include "platform_config.h"#define  GPIO_RTSPin              GPIO_Pin_1#define  GPIO_CTSPin              GPIO_Pin_0#define  GPIO_TxPin               GPIO_Pin_2#define  GPIO_RxPin               GPIO_Pin_3void USART2_Configuration(void);int USART_sendBuf(USART_TypeDef* USARTx, u8 *buf, u32 len);int USART_recvBuf(USART_TypeDef* USARTx, u8 *buf, u32 len);#endif //_HKY_UART_H_

/*HKY_uart.c*/#include "HKY_uart.h"/* --------------------------------------------------------------------------*//**  * @Brief:  USART2_Configuration  *//* --------------------------------------------------------------------------*/void USART2_Configuration(void){    USART_InitTypeDef USART_InitStructure;    GPIO_InitTypeDef GPIO_InitStructure;    //IO port----------------------------------------------------------------------    /* Configure USART2 RTS and USART2 Tx as alternate function push-pull */    GPIO_InitStructure.GPIO_Pin = GPIO_TxPin;//GPIO_RTSPin | GPIO_TxPin;    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;    GPIO_Init(GPIOA, &GPIO_InitStructure);    /* Configure USART2 CTS and USART2 Rx as input floating */    GPIO_InitStructure.GPIO_Pin = GPIO_RxPin;//GPIO_CTSPin | GPIO_RxPin;    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;    GPIO_Init(GPIOA, &GPIO_InitStructure);    /* USART2 configuration ------------------------------------------------------*/    /* USART2 configured as follow:- BaudRate = 115200 baud  - Word Length = 8 Bits- One Stop Bit- No parity- Hardware flow control enabled (RTS and CTS signals)- Receive and transmit enabled    */    USART_InitStructure.USART_BaudRate = 115200;    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_HardwareFlowControl_RTS_CTS;    USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;    USART_Init(USART2, &USART_InitStructure);    /* Enable the USART2 */    USART_Cmd(USART2, ENABLE);    USART_ClearFlag(USART2, USART_FLAG_TC); // clear flag}/* --------------------------------------------------------------------------*//**  * @Brief:  USART_sendBuf  *  * @Param: USARTx, which uart port * @Param: buf, send buffer * @Param: len, buffer length *  * @Returns:   send bytes count *//* --------------------------------------------------------------------------*/int USART_sendBuf(USART_TypeDef* USARTx, u8 *buf, u32 len){    u32 busy_cnt = 0;    u32 i = 0;    while (i < len)    {USART_SendData(USARTx, buf[i++]);busy_cnt = 0;while(USART_GetFlagStatus(USARTx, USART_FLAG_TXE) == RESET){    busy_cnt++;     if (busy_cnt > 0xffff)return i; //send error, return sended bytes count}    }    return len; }/* --------------------------------------------------------------------------*//**  * @Brief:  USART_recvBuf  *  * @Param: USARTx, which uart port * @Param: buf, receive buffer * @Param: len, buffer length *  * @Returns:  received bytes count *//* --------------------------------------------------------------------------*/int USART_recvBuf(USART_TypeDef* USARTx, u8 *buf, u32 len){    u32 busy_cnt = 0;    u32 i = 0;    while (i < len)    {if(USART_GetFlagStatus(USARTx, USART_FLAG_RXNE) != RESET){   buf[i] = USART_ReceiveData(USARTx) & 0xff;   i++;}else{    busy_cnt++;}if (busy_cnt > 0xffff)    return i; //receive error, return received bytes count    }    return len;}