sw.c

瑞萨(Renesas)M16C系列芯片的函数库

#include "sw.h"	// switch utility header file
#include "sfr62p.h"	// SFR definition of M16C/62P

/*""FUNC COMMENT""*************************************************************
* ID         		: ---
* Function name     : void InitSW(void)
* Function     		: initialize switch
* Paramenter   		: none
* Return 	 		: none
* Function used		: none
* Notice	   		: none
* History    		: ---
*""FUNC COMMENT END""*********************************************************/
void InitSW(void)
{
	pd3 = 0;	// set the port of switch as input
}

/*""FUNC COMMENT""*************************************************************
* ID         		: ---
* Function name     : unsigned char GetSW(void)
* Function     		: get the switch state
* Paramenter   		: none
* Return 	 		: none
* Function used		: none
* Notice	   		: none
* History    		: ---
*""FUNC COMMENT END""*********************************************************/
unsigned char GetSW(void)
{
	unsigned char value;
	value = p3;	// read the state of P3
	value = ~value;	// reverse the value because of the circuit
	return value;
}