cc2510 bidirectional communication

Wireless & IoT
1

I have problem making bidirectional link, and now after a week of trials I do not have any more ideas what is wrong…

Idea is to make a program ( on cc2510dk-mini) that reads pushed buttons on one board and send it to the other (button is read once when it is pressed).

I wrote that, and it works like a charm.

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

unsigned int i,j,s_1,s_2;
char    status=0;

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;

    
    
    // IOCFG2, IOCFG1, IOCFG0  --- Radio Test Signal Configuration--- default
    
    SYNC1       = 0xD3;
    SYNC0       = 0x91;
    
    PKTLEN      = 0x01; //1 Bajt info, +2 Bajta CRC
    
    PKTCTRL1    = 0x00; // PQT=000 -sync word is always accepted
                        // APPEND_STATUS = NE! ; ADR_CHK = 00 (NE)
    PKTCTRL0    = 0x04; //WHITE_DATA= 0; PKT_FORMAT[1:0] = 00 (normal mode) ; CC2400_EN = 0 (NE) ; CRC_EN = 1 (DA) ; LENGTH_CONFIG[1:0] = 00 Fixed packet length mode. Length configured in PKTLEN register
    ADDR        = 0x00;
    CHANNR      = 0x00;
    FSCTRL1     = 0x0A; // Izlazna frekvencija
    FSCTRL0     = 0x00;
    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     = 0x13;   // Modem configuration. Better Sensitivity ; GFSK ; MANCHESTER_EN = (NE) ; 30/32 sync word bits detected
    MDMCFG1     = 0x22;   // Modem configuration. FEC_EN=0; minimum number of preamble bytes = 4
    MDMCFG0     = 0xF8;   // Modem configuration.
    DEVIATN     = 0x44; 
    MCSM2       = 0x07; //default
    MCSM1       = 0x30; //CCA_MODE[1:0]=11 If RSSI below threshold unless currently receiving a packet
                        // RXOFF_MODE[1:0]= Normal , TX isto
    MCSM0       = 0x14;   // FS_AUTOCAL[1:0] = 01 When going from IDLE to RX or TX (or FSTXON)
    FOCCFG      = 0x16;   // Frequency Offset Compensation Configuration.
    BSCFG       = 0x6C;   // Bit synchronization Configuration.
    AGCCTRL2    = 0x03;   // AGC control.
    AGCCTRL1    = 0x40;   // AGC control.
    AGCCTRL0    = 0x91;   // AGC control.
    FREND1      = 0x56;   // Front end RX configuration.
    FREND0      = 0x10;   // Front end RX configuration.
    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   = 0x7E;   // PA output power setting.
    
   
    
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 ((MARCSTATE & MARCSTATE_MARC_STATE) != MARC_STATE_TX);
                  
                  P1 ^= 0x01 ;
                  RFD = P1;
            }
      if(s_2){     
                   /* Put radio in TX. */
                   RFST      = RFST_STX;

                   /* Wait for radio to enter TX. */  
                    while ((MARCSTATE & MARCSTATE_MARC_STATE) != MARC_STATE_TX);
                  
                    P1 ^= 0x02 ;
                    RFD = P1; 
            }
      while ((RFIF & RFIF_IRQ_TXUNF) == RFIF_IRQ_TXUNF){
          P1_0 = ~P1_0;
          P1_1 = ~P1_1;
          for(i=0;i<10000;i++);
        }
    }
    return 0;
}

but when I add a acknowledge of the sent package everything stops working.

When I look in RF-Studio, the first code is ok. It sends package only when button is pressed.

But when I add in the end of while(1) :

RFTXRXIF = 0;
				
RFST   = RFST_SRX;
i=0;
while(!RFTXRXIF  && i<60000){
                        i++;
                          }
if(RFTXRXIF){
          P1 = RFD;   
                   }
else P1 = 0x00;

if((RFIF & RFIF_IRQ_RXOVF) == RFIF_IRQ_RXOVF){
                while (1){
                            P1_1 = ~P1_1;
                            for(i=0;i<60000;i++);
                           }
}

then the first package is sent correctly, but on the next pressing of a button it just sends preamble… also the light on the board that sends package works like everything is ok. So I guess something goes wrong when exiting RX, but I do not know what. Any help?

P.S. I also tried sending with interrupt function, but nothing works… on the second pressing of the button it sends only preamble (forever).