工程结构图：

1、 main.c代码截图如下;

2、其中的LED代码与另外一篇《STM32 基于库函数控制按键蜂鸣器 LED显示》代码完全同。这里就不上了。

3、USART驱动部分：

#include"stm32f10x.h"
#include"usart1.h"
#include
#include

//========================================================
#ifdef __GNUC__

#define PUTCHAR_PROTOTYPE int __io_putchar(int ch)
#else
#define PUTCHAR_PROTOTYPE int fputc(int ch, FILE *f)
#endif
//========================================================

static void NVIC_Configuration(void)
{
NVIC_InitTypeDef NVIC_InitStructure;

NVIC_PriorityGroupConfig(NVIC_PriorityGroup_0);


NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
}

void USART_Config(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
USART_InitTypeDef USART_InitStructure;

RCC_APB2PeriphClockCmd(USART_Port_RCC|RCC_APB2Periph_AFIO,ENABLE); //开启USART使用的GPIO的时钟
#ifdef usart1
RCC_APB2PeriphClockCmd(USART_RCC,ENABLE); //开启USART的时钟
#elif defined usart2
RCC_APB1PeriphClockCmd(USART_RCC,ENABLE);
#endif

GPIO_InitStructure.GPIO_Pin =USART_TX_Pin;
GPIO_InitStructure.GPIO_Mode =GPIO_Mode_AF_PP; //复用推免式输出
GPIO_InitStructure.GPIO_Speed =GPIO_Speed_50MHz;

GPIO_Init(USART_TX_Port,&GPIO_InitStructure);

GPIO_InitStructure.GPIO_Pin =USART_RX_Pin;
GPIO_InitStructure.GPIO_Mode =GPIO_Mode_IN_FLOATING; //浮空输入

GPIO_Init(USART_RX_Port,&GPIO_InitStructure);

USART_InitStructure.USART_BaudRate=115200; //波特率
USART_InitStructure.USART_WordLength=USART_WordLength_8b; //8位字长
USART_InitStructure.USART_StopBits=USART_StopBits_1; //1位停止位
USART_InitStructure.USART_Parity=USART_Parity_No; //无奇偶效验位
USART_InitStructure.USART_Mode=USART_Mode_Tx|USART_Mode_Rx; //发送接收模式
USART_InitStructure.USART_HardwareFlowControl=USART_HardwareFlowControl_None; //无硬件流控

USART_Init(USART,&USART_InitStructure);

USART_ITConfig(USART,USART_IT_RXNE,ENABLE);

USART_Cmd(USART,ENABLE);

NVIC_Configuration();
}