怎么才能访问RS232啊，我试过了

char* msg="Dectected the character 't'.\n";
FILE* fp;
char prompt=0;
fp=fopen("/dev/uart_0","r+");
if(fp)
{
while(prompt!='v')
{
prompt=getc(fp);
if(prompt=='t')
{
fwrite(msg,strlen(msg),1,fp);
}
}
fprintf(fp,"Closing the UART file.\n");
fclose(fp);
}

也试过用寄存器来访问

还试过在属性中将Jtag-uart修改为Uart，都不行啊我真的要崩溃了，到后来干脆连IDE都不显示了

哪位大哥救救偶啊，谢谢啦