Microcontroller Texas Instruments MSP430F449 to Telit GPRS GM862 connection problems

Hi everybody,


I connected my MSP430F449 controller to GPRS GM862 over the RS232 serial port. I want to send AT<cr> command, and to read response OK (in fact, it responses <cr><lf>OK<cr><lf>). However, I receive only one character, the one I sent the last (and that is <cr>).

Here is the code. Where did I wrong?

It enters the interrupt routine only once... Please, help! Thanks!


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#include "io430.h"
#include "in430.h"

#include<string.h>
#include<stdio.h>

unsigned char d;
int b;

int main( void )
{
// Stop watchdog timer to prevent time out reset
WDTCTL = WDTPW + WDTHOLD;

P2SEL |= 0x30;
ME1 |= URXE0+UTXE0;
U0CTL = 0x10;
U0TCTL = 0x30;
U0BR0 = 0x6D;
U0BR1 = 0x00;
U0MCTL = 0x0040;
IE1 = 0x40;
_EINT();

b = 0;

while(!IFG1&UTXIFG0);
U0TXBUF = 'A';
while(!IFG1&UTXIFG0);
U0TXBUF = 'T';
while(!IFG1&UTXIFG0);
U0TXBUF = 0x0D;
while(!IFG1&UTXIFG0);

while(1)
{ }

}

#pragma vector = UART0RX_VECTOR
__interrupt void uart0RxHandler (void)
{
d = U0RXBUF;
b++;
}
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