enviando datos con cc2510

Hy, estoy intentando enviar un paquete simple de 1 byte con cc2510dk-mini. La idea es presionar el botón en el dispositivo y el led en el otro se enciende. Estoy atascado con el problema, cuando intento enviar datos, la radio se desborda y simplemente envía un preámbulo.

aquí está mi código (escrito en IAR)

#include <ioCC2510.h>
#include <ioCC2510_bitdef.h>

unsigned int i,s_1,s_2;

int S1(void){

if(P1_2 == 0){
   for(i=0;i<2000;i++);
   if(P1_2 == 0){
     return 1;
     }
   else 
     return 0;
 }
 else
   return 0;

}

int S2(void){

if(P1_3 == 0){
  for(i=0;i<20000;i++);
  if(P1_3 == 0){
   return 1;
   }
  else 
    return 0;
  }
else
  return 0;  

}

int main(void)
{ 


P1DIR       =0x03;
P1_0 = 0;
P1_1 = 0;

// Set the system clock source to HS XOSC and max CPU speed,
// ref. [clk]=>[clk_xosc.c]

SLEEP &= ~SLEEP_OSC_PD;
while( !(SLEEP & SLEEP_XOSC_S) );
CLKCON = (CLKCON & ~(CLKCON_CLKSPD | CLKCON_OSC)) | CLKSPD_DIV_1;
while (CLKCON & CLKCON_OSC);
SLEEP |= SLEEP_OSC_PD;


/* Setup radio with settings from SmartRF® Studio. The default settings are
 * used, except that "unmodulated" is chosen in the "Simple RX tab". This
 * results in an umodulated carrier with a frequency of approx. 2.433 GHz.
 */

FSCTRL1   = 0x0A;   // Frequency synthesizer control.
FSCTRL0   = 0x00;   // Frequency synthesizer control.
FREQ2     = 0x5D;   // Frequency control word, high byte.
FREQ1     = 0x93;   // Frequency control word, middle byte.
FREQ0     = 0xB1;   // Frequency control word, low byte.
MDMCFG4   = 0x86;   // Modem configuration.
MDMCFG3   = 0x83;   // Modem configuration.
MDMCFG2   = 0x30;   // Modem configuration.
MDMCFG1   = 0x22;   // Modem configuration.
MDMCFG0   = 0xF8;   // Modem configuration.
CHANNR    = 0x00;   // Channel number.
DEVIATN   = 0x00;   // Modem deviation setting (when FSK modulation is enabled).
FREND1    = 0x56;   // Front end RX configuration.
FREND0    = 0x10;   // Front end RX configuration.
MCSM0     = 0x14;   // Main Radio Control State Machine configuration.
FOCCFG    = 0x16;   // Frequency Offset Compensation Configuration.
BSCFG     = 0x6C;   // Bit synchronization Configuration.
AGCCTRL2  = 0x03;   // AGC control.
AGCCTRL1  = 0x40;   // AGC control.
AGCCTRL0  = 0x91;   // AGC control.
FSCAL3    = 0xA9;   // Frequency synthesizer calibration.
FSCAL2    = 0x0A;   // Frequency synthesizer calibration.
FSCAL1    = 0x00;   // Frequency synthesizer calibration.
FSCAL0    = 0x11;   // Frequency synthesizer calibration.
TEST2     = 0x88;   // Various test settings.
TEST1     = 0x31;   // Various test settings.
TEST0     = 0x09;   // Various test settings.
PA_TABLE0 = 0xFE;   // PA output power setting.
PKTCTRL1  = 0x00;   // Packet automation control.
PKTCTRL0  = 0x00;   // Packet automation control.
ADDR      = 0x00;   // Device address.
PKTLEN    = 0x01;   // Packet length.
MCSM1     = 0x30;
/* Settings not from SmartRF® Studio. Setting both sync word registers to
 * 0xAA = 0b10101010, i.e., the same as the preamble pattern. Not necessary,
 * but gives control of what the radio attempts to transmit.
 */
SYNC1     = 0xAA;
SYNC0     = 0xAA;

//RFD = 0x00;


while (1){

  s_1 = S1();
  s_2 = S2();

  while( ( s_1 == S1() )  &&   ( s_2 == S2() ) ); 



  if(s_1){
                /* Put radio in TX. */
              RFST      = RFST_STX;


              /* Wait for radio to enter TX. */

               while (!(RFTXRXIF));

               RFD = 0x01;

               RFTXRXIF &= 1;


              //for(i=0;i<60000;i++);
              P1_0 = 1;
              //RFST = RFST_SIDLE;

        }
  else
      {
              RFST      = RFST_STX;


              /* Wait for radio to enter TX. */

               while (!(RFTXRXIF));

               RFD = 0x00;

               RFTXRXIF &= 1;

               P1_0 = 0;
      }

  if(s_2){
               RFST      = RFST_STX;


              /* Wait for radio to enter TX. */

               while (!(RFTXRXIF));

               RFD = 0x02; 

               RFTXRXIF &= 1;

                P1_1 = 1;

              //RFST = RFST_SIDLE;
              //while ((MARCSTATE & MARCSTATE_MARC_STATE) != MARC_STATE_ENDCAL);
        }

 else
      {

              RFST      = RFST_STX;


              /* Wait for radio to enter TX. */

               while (!(RFTXRXIF));

               RFD = 0x00; 

               RFTXRXIF &= 1;

                P1_1 = 0;

        }


  if(RFIF_IRQ_TXUNF){
    while(1){
      P1_0 = ~P1_0;
      P1_1 = ~P1_1;
      for(i=0;i<10000;i++);
    }
  }



}

return 0;
}