uart_rxd.c

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#include<stdio.h>
#include<string.h>
#include<fcntl.h>
#include"system.h"
#include"unistd.h"
#define BUFFER_SIZE 10
/* the green font is use ANSIC C function;*/
/* and black font is use HAL API function,*/
/* it likes UNIX command                  */
int main(void)
{
  char *msg;
  char *message="you have recive from uart:";
  char *message2="open uart successfully,input 10 characters";
  FILE*fp;
  //fp=fopen("/dev/uart","r+");
  fp=open(UART_NAME,O_RDWR,0666);
  if(fp!=NULL)
  {
    //fprintf(fp,"open uart successfully,input 10 characters\n")
    write(fp,message2,strlen(message2));
    while(fp)
    {
      //fread(msg,BUFFER_SIZE,1,fp);
      read(fp,msg,BUFFER_SIZE);
      //fprintf(fp,"you have recive from uart:");
      write(fp,message,strlen(message));
      //fprintf(fp,"%s\n",msg);
      write(fp,msg,BUFFER_SIZE);
    }
  }
  else
  printf("open uart failed\n");
  fclose(fp);
  return 0;
}