extern int left_press_low;

 void cal_step_data(void)
 {
	 static  int  step_count_sum = 0;
	 
	 step_count = 1;
	 step_count_sum += step_count;
	 
	 float step_length = sqrt((last_pos_n[0] - pos_n[0])*(last_pos_n[0] - pos_n[0]) + (last_pos_n[1] - pos_n[1])*(last_pos_n[1] - pos_n[1]));
		 
	 if(step_length > 5.0f)
	 {
		 step_length = 1.2f;
	 }
		 
	 step_distance  = (uint16_t)(step_length * 100.0f);

	 sen_step_to_host(step_count, step_distance);
	 
 }