typedef struct{	
	long task; // Variable: Task address pointer float 
	*iptr1; // Input: First input pointer float 
	*dbuff_ptr; // pointer to the location of the data buffer 
	float trig_value; // Input: Trigger point 
	int prescalar; // Parameter: Data log pre scale 
	int skip_cntr; // Variable: Data log skip counter 
	int cntr; // Variable: Data log counter 
	float *write_ptr; // Variable: Graph address pointer 
	int size; // Parameter: Maximum data buffer 
	int current_state; // current state 1= Wait for trigger, 2 = check for rising edge , 3= log data , 4= reset data log 
	int (*init)(); // Pointer to init function 
	int (*update)(); // Pointer to update function 
} DLOG_CH; 

// the init function should update the state to be 1 , i.e. wait for trigger 

DLOG_CH_update() 
{ 
	switch(current_state) 
	{ 
		case 1: // if the value is already greater than the trig value then do not trigger 
				// if the value is smaller than trigger value then wait for rising edge 
				if(*iptr1<trig_value) 
					current_state=2; // wait for the rising edge
				break; 
		case 2: // wait for the rising edge
				if(*iptr1>trig_value) // the value crossed the trigger value in the rising edge
				    current_state=3; // start logging data
				break;
		case 3: skip_cntr++; 
				if(skip_cntr==prescalar) 
				{ 
					// log data 
					*write_ptr=*iptr1; 
					write_ptr++; // move the data buffer pointer to the next location 
					skip_ctr=0; 
					cntr++; 
				} 
				if(cntr==size) 
				{ 
					current_state=4; // finished buffering data for this trigger, reset datalogger 
				} 
				break; 
		case 4: write_ptr=dbuff_ptr; // point the write buffer to the first buffer location 
				cntr=0; 
				current_state=1; // now keep on waiting for trigger 
				break; 
	} 
}