diff -c irt-06\sctimer.c irt\sctimer.c
*** irt-06\sctimer.c	Fri Oct 31 17:51:05 2014
--- irt\sctimer.c	Thu Dec 04 11:23:14 2014
***************
*** 12,17 ****
--- 12,18 ----
  void sct_enable_carrier(void);
  void sct_disable_carrier(void);
  
+ u_long Tdiv;
  
  /* =============================================================== */
  
***************
*** 21,27 ****
  void sctimer_c_init(u_long sysCLK)
  {
  	u_long n, tmp;
! 	u_long Tdiv, Tdiv_half;
  
  	/*
  	 * enable clock for SCT
--- 22,28 ----
  void sctimer_c_init(u_long sysCLK)
  {
  	u_long n, tmp;
! 	u_long Tdiv_half;
  
  	/*
  	 * enable clock for SCT
***************
*** 55,60 ****
--- 56,63 ----
  	 */
  	Tdiv = sysCLK / (38 * 1000);
  	Tdiv_half = Tdiv / 2;
+ 	Tdiv -= 1;				/* set (n-1) for 1/n */
+ 	Tdiv_half -= 1;
  
  	LPC_SCT->CONFIG = 0
  					| (1<<0)		/* 32bit operation */
***************
*** 151,157 ****
   */
  void sct_enable_carrier(void)
  {
! 	LPC_SCT->CTRL_U |= SCT_CTRL_CLRCTR_L;	/* clear counter */
  	LPC_SCT->CTRL_U &= ~SCT_CTRL_HALT_L;	/* release halt */
  }
  
--- 154,161 ----
   */
  void sct_enable_carrier(void)
  {
! //	LPC_SCT->CTRL_U |= SCT_CTRL_CLRCTR_L;	/* clear counter */
! 	LPC_SCT->COUNT_U = Tdiv;			/* make first match just after start */
  	LPC_SCT->CTRL_U &= ~SCT_CTRL_HALT_L;	/* release halt */
  }