Code:
void keyscan()
{
RD0=1;RD1=1;RD2=1;RD3=1;
if(SW1 != 1) { key=0;SW1=1;delay_ms(150);}
if(SW2 != 1) { key=1;SW2=1;delay_ms(150);}
if(SW3 != 1) { key=2;SW3=1;delay_ms(150);}
if(SW4 != 1) { key=3;SW4=1;delay_ms(150);}
if(key != 5)
{
switch (key)
{ case 0: {mode++;key = 5;blink=1;set_blink();}
break;
case 1: {change_time();key = 5;update_1307();}
break;
case 2: {clear_status();key = 5;}
break;
}
}
}