TEST/TEST_Prj/smart_ysj/程序/SYSTEM/usart/usart.c

#include "sys.h"
#include "usart.h"	  
#include "string.h"
#include <stdarg.h>

#define Usart1ReadLen 50
//值
char  Usart1ReadBuff[Usart1ReadLen]={0};  //接收数据缓存
u32 Usart1ReadCnt = 0;//串口1接收到的数据个数
#if 1
#pragma import(__use_no_semihosting)             
//标准库需要的支持函数                 
struct __FILE 
{ 
	int handle; 

}; 

FILE __stdout;       
//定义_sys_exit()以避免使用半主机模式    
_sys_exit(int x) 
{ 
	x = x; 
} 
//重定义fputc函数 
int fputc(int ch, FILE *f)
{      
	while((USART1->SR&0X40)==0);//循环发送,直到发送完毕   
    USART1->DR = (u8) ch;      
	return ch;
}
#endif 

 
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   GPIOA.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);//初始化GPIOA.9
   
  //USART1_RX	  GPIOA.10初始化
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;//PA10
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;//浮空输入
  GPIO_Init(GPIOA, &GPIO_InitStructure);//初始化GPIOA.10  

  //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;//串口波特率
	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1
   USART_ITConfig(USART1, USART_IT_IDLE, ENABLE);
	 USART_ITConfig(USART1, USART_IT_RXNE, ENABLE);//开启串口接受中断
  USART_Cmd(USART1, ENABLE);                    //使能串口1 

}

void UsartSendData(u8 *p,char len)
{
	      while(len--)
				{
          while(USART_GetFlagStatus(USART1, USART_FLAG_TC) == RESET);
          USART_SendData(USART1, *p++);
				}
}

extern u8 jr_flag;
extern u8 mode_flag; 

void USART1_IRQHandler(void)                	//串口1中断服务程序
{
	u8 Res,rxes;
	if(USART_GetITStatus(USART1, USART_IT_RXNE) != RESET)  //接收中断(接收到的数据必须是0x0d 0x0a结尾)
	{
	   	Res =USART_ReceiveData(USART1);	//读取接收到的数据
		if(Usart1ReadCnt < Usart1ReadLen-1)
		{
			Usart1ReadBuff[Usart1ReadCnt] = Res;
		}
		else
		{
			Usart1ReadCnt=0;
		}
		Usart1ReadCnt ++;	//数据个数
  } 
	if(USART_GetITStatus(USART1, USART_IT_IDLE) != RESET)//空闲中断 
	{
		//用读SR和DR的方法清除IDLE
		rxes = USART1->SR;
		rxes = USART1->DR;
		if(Usart1ReadCnt>5)
		{
			if(strstr(Usart1ReadBuff,"open")!=NULL)
			{
			  jr_flag=1;
			}else if(strstr(Usart1ReadBuff,"open")!=NULL)
			{
			   jr_flag=0;
			}
			else if(strstr(Usart1ReadBuff,"mode1")!=NULL)
			{ 
			   mode_flag=1;
			}else if(strstr(Usart1ReadBuff,"mode0")!=NULL)
			{
			   mode_flag=0;
			}
		}
		Usart1ReadCnt=0;
		memset(Usart1ReadBuff,0,Usart1ReadLen-1);
	}
}