valve.c

基于avr单片机的氢气测控系统源代码

#include <avr/io.h>
#include "valve.h"
#include "global.h"

void initValve()
{
//NOTE VERY IMPORTANT.
//For the initialize we set the PORTD register.
//But we mustn't open all the valve at the beginning. 
//What will happen if we do so? 
//All the chemical material flows into the garbage can!!!
    PORTD = 0x00;
    DDRD = 0xff;
    //OK, shut up all valves!!!
    setValveState(0, VALVE1_OFF | VALVE2_OFF | VALVE3_OFF | VALVE4_OFF);
}

void setValveState(unsigned char on, unsigned char mask)
{
    if(on == 1)
    {
        PORTD &= mask;
    }
    else if(on == 0)
    {
	PORTD |= mask;
    }
}