[Tinyos-help] What's wrong with this code for I2C communication

[Sagar Bijwe]

Hi,
I have written following code for the master

module TestI2CM {
  provides {
    interface StdControl;
  }
  uses {
    interface Timer2<TMilli> as Timer;
    interface Timer2<TMilli> as TimerConflict;
    interface LocalTime<T32khz>;
    interface Leds;
    interface SPSend;
    interface Debug;
    interface ResourceCmd;
    interface  MSP430I2CPacket ;
    interface StdControl as I2CControl;
    interface MSP430I2C ;
    interface MSP430I2CEvents;
  }
}
implementation {


void dbg_msg(char *str, ...) {
#include<stdio.h>
#include<stdarg.h>
#include<string.h>
va_list ap;
char buf1[TOSH_DATA_LENGTH - 4];
va_start(ap, str);
sprintf(buf1,"%d:",TOS_LOCAL_ADDRESS);
vsprintf(buf1+2,str,ap);
va_end(ap);
call Debug.print(buf1);
    }
char  str[100];
  uint32_t counter=0;
  sp_message_t m_spmsg;
  TOS_Msg m_tosmsg;
  uint8_t m_size;
  uint8_t k1=111;
  uint8_t flag=1;
 uint8_t *send_data_ptr;
  uint8_t *receive_data_ptr;
  uint8_t send_data;
  uint8_t receive_data;
  uint16_t I2C_ADDRESS;
  uint8_t length;
  event void SPSend.sendDone(sp_message_t* spmsg, sp_message_flags_t flags,
sp_error_t error) {

  }
   event void MSP430I2CPacket.readPacketDone(uint16_t _addr, uint8_t
_length, uint8_t* _data, result_t _success) { }
   event void MSP430I2CPacket.writePacketDone(uint16_t _addr, uint8_t
_length, uint8_t* _data, result_t _success) {
call Leds.redToggle();
call ResourceCmd.release();
call ResourceCmd.request( RESOURCE_NONE );
}


event void ResourceCmd.granted(uint8_t rh) {
call MSP430I2CPacket.writePacket(rh,I2C_ADDRESS, length, send_data_ptr);


}
task void send_cont()
{
call ResourceCmd.request( RESOURCE_NONE );

}

  event void Timer.fired() {
    //call ResourceCmd.request( RESOURCE_NONE );
   //call Timer.startPeriodic( 1000 );
  }

  event void TimerConflict.fired() {
  //  sendMessage();
  }

  command result_t StdControl.init() {
call I2CControl.init();
call MSP430I2C.enable();
call MSP430I2C.setModeMaster();
call MSP430I2C.enable();
call MSP430I2C.setModeMaster();
I2C_ADDRESS = 0x004d; // address of the
 length =1;
  send_data=7;
  receive_data=0;
  send_data_ptr= &send_data;
  receive_data_ptr=&receive_data;

 return SUCCESS; }

  command result_t StdControl.start() {
dbg_msg("Booted");
post send_cont();
return SUCCESS;
  }

  command result_t StdControl.stop() {
  call I2CControl.stop();
  dbg_msg("Stopped");
   call Leds.redOff();
    call Leds.yellowOff();
    call Leds.greenOff();
return SUCCESS; }

  async event void MSP430I2CEvents.arbitrationLost() {}

  async event void MSP430I2CEvents.noAck(){}

  async event void MSP430I2CEvents.ownAddr(){}

  async event void MSP430I2CEvents.readyRegAccess(){}

  async event void MSP430I2CEvents.readyRxData(){}

  async event void MSP430I2CEvents.readyTxData(){}

  async event void MSP430I2CEvents.generalCall(){}

  async event void MSP430I2CEvents.startRecv(){}


}


Configuration file looks like this
configuration TestI2C {
}
implementation {
  components SPC,DebugM,GenericComm as Comm,

    LedsC
    , Counter32khzC
    , new TimerMilliC()
    , new TimerMilliC() as TimerConflictC
    , Main
    , TestI2CM
, MSP430I2CM
,new I2CResourceC() as I2CResource
,HPLUSART0M


    ;



Main.StdControl -> TestI2CM;
  TestI2CM.I2CControl-> MSP430I2CM;
  TestI2CM.MSP430I2C-> MSP430I2CM;

  TestI2CM.MSP430I2CEvents-> MSP430I2CM;
MSP430I2CM.USARTControl->HPLUSART0M ;
 MSP430I2CM.HPLI2CInterrupt->HPLUSART0M ;
  TestI2CM.MSP430I2CPacket-> MSP430I2CM;
  TestI2CM.ResourceCmd->I2CResource;
  TestI2CM.Timer -> TimerMilliC;
  TestI2CM.TimerConflict -> TimerConflictC;
  TestI2CM.Leds -> LedsC;
   TestI2CM.Debug-> DebugM.Debug;
   TestI2CM.LocalTime -> Counter32khzC;
DebugM.SendMsg -> Comm.SendMsg[8];
  TestI2CM.SPSend -> SPC.SPSend[1];
}

I am not getting the desired ouput. The master fails after sending 3 to 4
times. I need to connect another mote at other end that too a master. How
can arbitration be held over the I2C . How can i modify the code to work
both as master & slave??
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