Difficulty interfacing Atmega32 with GSM mobile ............

#include<avr/io.h>
#include<util/delay.h>

#define A 0x41
#define C 0x43
#define T 0x54
#define M 0x4d
#define G 0x44
#define D 0x47
#define E 0x48
#define P 0x50
#define S 0x53


void init_txr(void);
void trans_data(char);


int main(void)

{
    
DDRB=0xff;
DDRA=0xff;
init_txr();


int x[10]={'A','T',0x3d,'C','M','G','D',0x2b,0x01,0x0d},i;
int y[13]={'A','T',0x3d,'C','P','M','S',0x2b,0x22,'M','E',0x22,0x0d};
int z[10]={'A','T',0X3D,'C','M','G','F',0X2B,0X00,0X0D};

while(1)

{

for(i=0;i<13;i++)
trans_data(y[i]);

_delay_ms(50);

for(i=0;i<10;i++)
trans_data(z[i]);

_delay_ms(50);

for(i=0;i<10;i++)
trans_data(x[i]);

_delay_ms(50);


}

return 0;

}



void init_txr(void)

{

//UBRRH=0x00;
UBRRL=0x19;
//UCSRC=0x86;
UCSRB=0x08;
//UCSRA=0x00;

}


void trans_data(char a)

{



while(!(UCSRA & (1<<UDRE)))

;

UDR=a;
PORTA=0x0f;

}