Regarding I2C Interfacing in CC2530

#include "hal_board.h"
#include "ioCC2530.h"
#include "hal_cc8051.h"
#include "hal_mcu.h"
#include "hal_types.h"
#include "stdio.h"
#include "i2c.h"

void wait()
{
  halMcuWaitUs(200);
}
void start(void)
{
  wait();
  if((!SDA) || (!SCL))
  {
    smbBUS_BLOCKED++;
  }
  D_LO(); //pull the SDA line LOW
  wait();
  CLK_LO(); //pull the clock line LOW
  wait();
  D_HI(); //pull the Data line HIGH
  wait();
}
void stop(void)
{
   D_LO();
   wait();      
   CLK_HI();
   wait();   
   
   if (!SCL){ smbBUS_BLOCKED++; }
   
   D_HI();
   wait();  
   
   if (!SDA){ smbBUS_BLOCKED++; }
   halMcuWaitMs(2);// to avoid too fast stop to start condition - workaround! // 
}
 uint8 readBit()
{
  uint8 ack;
  
  D_HI();
  wait();  
  CLK_HI();
  wait();    
  if (!SCL){ halMcuWaitMs(10); } //clock stretching, add wait  , v5
  if (!SCL){ halMcuWaitMs(10); } 
  if (!SCL){ halMcuWaitMs(10); } 
  if (!SCL){ halMcuWaitMs(10); } 
  if (!SCL){ halMcuWaitMs(10); } 
  if (!SCL){ halMcuWaitMs(10); } 
  
  if (!SCL)
  {smbBUS_BLOCKED++;}
  wait();//new  
  wait();//new  
  ack = SDA;
  wait();  
  CLK_LO();
  wait();    
  
  return ack;//0=ack
}
void writeBit(uint8 write)
{
 CLK_LO();//new
wait();//new  
 
  if(write > 0){ D_HI();}else{D_LO(); }
  wait();      
  CLK_HI();
  wait();        
  if (!SCL){ halMcuWaitMs(10); } //clock stretching, add wait >12ms for Si7020 stretching   
  if (!SCL){ halMcuWaitMs(10); } 
  if (!SCL){ halMcuWaitMs(10); } 
  if (!SCL){ halMcuWaitMs(10); } 
  if (!SCL){ halMcuWaitMs(10); } 
  if (!SCL){ halMcuWaitMs(10); } 
  
  if (!SCL){ smbBUS_BLOCKED++; }
  //CLK_LO();//new
  CLK_LO();
  wait();          
}

uint8 sendByte(uint8 b)
{
 uint8 i;
   uint8 ack;
   for (i = 0; i < 8; i++){
      smbWriteBit(b & 0x80);
      b = (b <<  1);
   }
   
   ack = !(smbReadBit() );
   return ack; //high = ACK received
}

void BIT()
{
  if( (!SCL) || (!SDA))
  {
    smbBUS_BLOCKED++;
    printf("\nI2C Error.....\n");
    while(TRUE)
    {
      LED_R_SET();
      Buzzer(1400,100,0);
      halMcuWaitMs(100);
      Buzzer(700,100,0);
      halMcuWaitMs(100);
    }
  }
}

uint8 readByte()
{
  uint8 byte = 0;
  uint8 i;
  for (i = 0; i < 8; i++) {
    byte = (byte << 1) | smbReadBit();
  }
  return byte;
}

void restart()
{
  D_HI();//
  CLK_HI();//
  smbStart();//
  return;//

  D_LO();
  wait();
  CLK_HI();
  wait();
  D_HI();
  wait();  
  CLK_LO();
  wait();    

  CLK_HI();
  
  wait();    
  D_LO();
  wait();      
  CLK_LO();
  wait();
}