programming AT89C51 atmel family microcontroller

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#include<reg52.h>
#include<lcd.h>
#include<intrins.h>
sbit motor=P0^0;
sbit sw=P0^1;
 
void SEND_CHR(unsigned char);
void RECEIVE_CHR();
void SEND_SMS(unsigned char *nm);
void GSM_INIT(void);
unsigned char rch; 
unsigned char buff[40]; 
 
void print(char *str)
{
while(*str)
{
SBUF = *str++;
while(TI == 0);
TI = 0;
}
}
void RECEIVE_MEM()
{
unsigned int i=0;
while(1)
{
do
{
RECEIVE_CHR();
}while(rch != '$');
RECEIVE_CHR();
if(rch == '3')
    {
    RECEIVE_CHR();
    if(rch == 'A')
        {
        RECEIVE_CHR();
        if(rch == '0')
            {
            RECEIVE_CHR();
            if(rch == 'M')
                {
                RECEIVE_CHR();
                if(rch == 'D')
                    {
                    RECEIVE_CHR();
                    if(rch == 'S')
                    {
                    i = 0;
                    do
                    {
                    RECEIVE_CHR();
                    buff[i] = rch;
                    }while(buff[i++]!='$');
                    goto nex;
                    }
                    }               
                }
            }
        }
    }
}
nex:;
} 
 
 
void main()
{
unsigned char i=0;
motor=0;
sw=1;
TMOD = 0x20;
SCON = 0x50;
TH1 = 0xFA;  
TR1 = 1;
init_lcd();
display_lcd("MAES BASED");
cmd_lcd(0xC0);
display_lcd("SECURITY SYSTEM");
delay_ms(300);
init_lcd();
//GSM_INIT();
print("AT+CMGF=1\r\n");
delay_ms(300);
TH1 = 0xFD;  
init_lcd();
while(1)
{
TH1=0xFD;
delay_ms(75);
init_lcd();
display_lcd("MEMS BASED");
cmd_lcd(0xC0);
display_lcd("SECURITY SYSTEM");
for(i=0;i<32;i++)
{
RECEIVE_CHR();
buff[i]=rch;
}
//init_lcd();
if(buff[29]=='L' || buff[29]=='R' || buff[29]=='S' || buff[29]=='I')
{
TH1=0xFA;
delay_ms(75);
motor=1;
SEND_SMS("9032323048");
//SEND_SMS("9701515557");
motor=0;
delay_ms(200);
init_lcd();
display_lcd("WAIT FOR DOOR");
cmd_lcd(0xC0);
display_lcd("OPEN");
while(sw==1);
motor=1;
init_lcd();
display_lcd("DOOR OPENED");
delay_ms(300);
motor=0; 
TH1=0xFD;
}
}
}
void RECEIVE_CHR()
{
while(RI==0);
rch = SBUF;
RI=0;
}
void SEND_CHR(unsigned char c)
{
SBUF = c;
while(TI==0);
TI=0;
}
void SEND_SMS(unsigned char *nm)
{
unsigned int i=0,j=0;
TH1=0xFA;
cmd_lcd(0x01);
display_lcd("SENDING SMS...");
print("AT+CMGS=");
SEND_CHR('"');
print(nm);
SEND_CHR('"');
print("\r\n");
delay_ms(500);
print("SOMEBODY IS TRYING TO ROBERY");
print("\r\n");
print("\r\n");
i=0;
SEND_CHR(0x1A);
SEND_CHR(0x1A); //END OF MESSAGE INDICATION. (ctrl + z)
delay_ms(500);
}
 
 
void GSM_INIT(void)
{
    cmd_lcd(0x01);
    display_lcd("GSM INITIALIZING");
    cmd_lcd(100);
    print("AT\r\n");
    delay_ms(300);
    print("AT\r\n");
    delay_ms(300);
    print("AT\r\n");
    delay_ms(300);
    print("AT+IPR=4800\r\n");
    delay_ms(300);
    print("AT+CMGF=1\r\n");
    delay_ms(300);
    print("AT+CNMI=0,1,0,0,0\r\n");
    delay_ms(300);
    print("ATE0\r\n");
    delay_ms(300);
    print("AT&W\r\n");
    delay_ms(300);
    print("AT+CREG?\r\n");
    delay_ms(300);
    print("AT+CREG?\r\n");
    delay_ms(300);
}