microcontroller - 如何使用微控制器 8051 通过中断 4 从 UART 获取字符串

Question

我有点难以从中断 4 函数中获取字符串。但是当我尝试获取单个字符并在 LCD 2*16 中显示时效果很好。但是当我尝试从“dot[i]”变量中获取字符串以显示给 LCD 时，它不起作用。

这是我的代码：

void Init_SerialT2()
 {
     //timer 2 Osilator 12 MHz
     SetTRCLK(1,1); /*using for send and receive function*/
     SM0 = 0;
     SM1 = 1;       /* register serial control mode1 = 8 bit UART*/
     TH2 = 0x5;
     TL2 = 0x124;
     //TH2=0x03;
     //TL2=0x03;
     RCAP2H = 0xff; /*RCAP2 0xffd9 baut rate 9600 at F osilator 12Mhz*/
     RCAP2L = 0xd9; 
     C_T2 = 0;      /* using As timer function*/
     REN = 1;       /* Receive enable*/
     TR2 = 1;   /* Timer 2 start*/
 }

volatile unsigned char RX_IN_CHR_UART[16]; // global var
void Interrupt_TerimaChar() interrupt 4
{
    volatile unsigned int i =0;
    volatile unsigned char ch;
    volatile unsigned char *dor;

    TI=0;
    if(RI)
    {
      ch = SBUF;
      RI =0;
       for(i=0;i<RX_IN_CHR_UART[i];i++)
       {
          RX_IN_CHR_UART[i] = ch;  // save character int array
          dor[i]= RX_IN_CHR_UART[i];
       }
       LCD_command(0x86);
       //LCD_senddata(ch); // test to get char it's works
       LCD_sendstring(dor);
       ES =1;   
    }
}

对于我使用 Keil v4 的编译器