[Tinyos-help] TX underflow problem

[=?ks_c_5601-1987?B?waSw6Ljt?=]

Hello all 

 

I¡¯m testing Mesh Routing in Tinyos-2.x.

During the test, nodes send a lot of broadcast message. All node receive
and send it then TX underflow takes place

The node which has TX underflow fails to send messages.

Therefore, I included in /opt/tinyos-
2.x/tos/chips/cc2420/CC2420TransmitP.nc as follows 

 

void loadTXFIFO() {

    uint8_t status;

    cc2420_header_t* header = call CC2420Packet.getHeader( m_msg );

    uint8_t tx_power = (call CC2420Packet.getMetadata( m_msg ))->tx_power;

 

    if ( !tx_power ) {

      // If our packet's tx_power wasn't configured to anything but 0,

      // send it using the default RF power.  This assumes the

      // packet's metadata is all set to 0's on boot.

 

      tx_power = CC2420_DEF_RFPOWER;

    }

 

    call CSN.clr();

 

    if ( m_tx_power != tx_power ) {

      call TXCTRL.write( ( 2 << CC2420_TXCTRL_TXMIXBUF_CUR ) |

                         ( 3 << CC2420_TXCTRL_PA_CURRENT ) |

                         ( 1 << CC2420_TXCTRL_RESERVED ) |

                         ( (tx_power & 0x1F) << CC2420_TXCTRL_PA_LEVEL ) );

    }

 

    m_tx_power = tx_power;

 

    status = call TXFIFO.write( (uint8_t*)header, header->length - 1 );

    if(status & 0x20) {  <<----------------------------from      

atomic {

        call CSN.clr();

        call SFLUSHTX.strobe();

call CSN.set();

      }

    } <---------------------------------------------- to 

}

 

But, sending process isn¡¯t recovered

I know TX underflow can solve through TX flush

 

If you know the answer, please let me know it 

 

Thanks 

   

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