使用P16F877A从GSM SIM900a接收字符串

Question

我让代码从SIM900A内存中读取短信，但是没有正确接收字符串。我想在LCD 16 * 2上打印收到的字符，但是如果发送“ABCDEFGH”，那么只有“ABC”打印在LCD上后续字符被打印为垃圾。

  #define led1 PORTC.F1
#define led PORTC.F0
#define RS PORTC.F1
#define RW PORTC.F2
#define EN PORTC.F3
 unsigned char inchar;
unsigned char a[]={"#on"};
unsigned char b[]={"#of"};
 unsigned int i=0,j,k=0,l=0,m;
 char *buffer[80] ;
 void Tx();
 void rcv();
 void cmd( unsigned char x);
 void dat ( unsigned char x );
void int_lcd();
 void main()
 {

 TRISD=0x00;
 TRISC=0x80;
 led=0;
 led1=0;
  UART1_Init(9600);
   delay_ms(300);
  UART1_Write(0x0D);
  delay_ms(300);
 UART1_Write_Text("AT+CMGF=1");
 UART1_Write(0x0D);
 delay_ms(300);
  UART1_Write_Text("AT+CNMI=2,2,0,0" );
   UART1_Write(0x0D);
  delay_ms(300) ;
 UART1_Write_Text("AT+CMGR=1");
 UART1_Write(0x0D);`enter code here`
   delay_ms(300);
 PIR1.RCIF=0;
   int_lcd();

    while(1)
{ i=0;
   while(UART1_Data_Ready()==1)
       {       rcv();

    }
    if(UART1_Data_Ready()==0 )
    {
    for (j=0;j<i;j++)
        {
       dat(buffer[j]);
          delay_ms(100);
       if(j==15)
            cmd(0xc0);
                }
             }

            UART1_Write_Text("AT+CMGD=1,4");
          }
          }
           void rcv()
         {
          while(PIR1.RCIF==1){
          PIR1.RCIF=0;
       inchar=UART1_Read();
             buffer[i]=inchar ;
     i++; }

          if (RCSTA.OERR==1||RCSTA.FERR==1)
               {
                  k = RCREG;
               RCSTA.CREN = 0;
                    PIR1.RCIF = 0;
                    RCSTA.CREN = 1;
                       return;}
  }
  void cmd( unsigned char x)
 {
  PORTD=x;
     RS=0;
      RW=0;
     EN=1;
      delay_ms(100);
   EN=0;
     }
      void dat ( unsigned char x )
   { 
      PORTD=x;
    RS=1;
  RW=0;
     EN=1;
     delay_ms(100);
    EN=0;
     }
         void int_lcd()
     {
      cmd(0x38);
      cmd(0x0e);
       cmd(0x01);
       cmd(0x06);
      cmd(0x80);
          }

这是我的代码