实验2串口实验

void uart_init(u32 bound){
    //GPIO端口设置
    GPIO_InitTypeDef GPIO_InitStructure;
    USART_InitTypeDef USART_InitStructure;
    NVIC_InitTypeDef NVIC_InitStructure;
     
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1|RCC_APB2Periph_GPIOA, ENABLE);    //使能USART1，GPIOA时钟
     //USART1_TX   PA.9
    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9; //PA.9
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;    //复用推挽输出
    GPIO_Init(GPIOA, &GPIO_InitStructure);
   
    //USART1_RX      PA.10
    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;//浮空输入
    GPIO_Init(GPIOA, &GPIO_InitStructure);  

   //Usart1 NVIC 配置

    NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQn;
    NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=3 ;//抢占优先级3
    NVIC_InitStructure.NVIC_IRQChannelSubPriority = 3;        //子优先级3
    NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;            //IRQ通道使能
    NVIC_Init(&NVIC_InitStructure);    //根据指定的参数初始化VIC寄存器
  
   //USART 初始化设置

    USART_InitStructure.USART_BaudRate = bound;//一般设置为9600;
    USART_InitStructure.USART_WordLength = USART_WordLength_8b;//字长为8位数据格式
    USART_InitStructure.USART_StopBits = USART_StopBits_1;//一个停止位
    USART_InitStructure.USART_Parity = USART_Parity_No;//无奇偶校验位
    USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;//无硬件数据流控制
    USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;    //收发模式

    USART_Init(USART1, &USART_InitStructure); //初始化串口
    USART_ITConfig(USART1, USART_IT_RXNE, ENABLE);//开启中断
    USART_Cmd(USART1, ENABLE);                    //使能串口 

}

#include "led.h"
      
//初始化PA0为输出口.并使能这个口的时钟            
//LED IO初始化
void LED_Init(void)
{
 
 GPIO_InitTypeDef  GPIO_InitStructure;
     
 RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);     //使能PA端口时钟

 GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0;                 //LED0-->PA0 端口配置
 GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;          //推挽输出
 GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;         //IO口速度为50MHz
 GPIO_Init(GPIOA, &GPIO_InitStructure);                     //根据设定参数初始化GPIOA0
 GPIO_SetBits(GPIOA,GPIO_Pin_0);                         //PA0 输出高
}
 

#ifndef __LED_H
#define __LED_H     
#include "sys.h"

#define LED0 PAout(0)// PA0

void LED_Init(void);//初始化
                             
#endif

#include "led.h"
#include "delay.h"
#include "sys.h"
#include "usart.h"
 int main(void)
 {        
     u8 t;
    u8 len;    
    u16 times=0;
    delay_init();             //延时函数初始化      
    NVIC_Configuration();      //设置NVIC中断分组2:2位抢占优先级，2位响应优先级
    uart_init(9600);     //串口初始化为9600
     LED_Init();                 //LED端口初始化
     while(1)
    {
        if(USART_RX_STA&0x8000)
        {                       
            len=USART_RX_STA&0x3f;//得到此次接收到的数据长度
            printf("\r\n您发送的消息为:\r\n\r\n");
            for(t=0;t<len;t++)
            {
                USART_SendData(USART1, USART_RX_BUF[t]);//向串口1发送数据
                while(USART_GetFlagStatus(USART1,USART_FLAG_TC)!=SET);//等待发送结束
            }
            printf("\r\n\r\n");//插入换行
            USART_RX_STA=0;
        }else
        {
            times++;
            if(times%5000==0)
            {
                printf("\r\n口袋里的超超 串口实验\r\n");
                printf("真JB帅\r\n\r\n");
            }
            if(times%200==0)printf("请输入数据,以回车键结束\n");  
            if(times%30==0)LED0=!LED0;//闪烁LED,提示系统正在运行.
            delay_ms(10);   
        }
    }     
 }