void read_key(void)
{
if(PINA==0xFE)
{
up_press=1;
}
else
{
up_press=0;
};

if(PINA==0xFD)
{
down_press=1;
}
else
{
down_press=0;
};

if(PINA==0xFB)
{
left_press=1;
}
else
{
left_press=0;
};

if(PINA==0xF7)
{
right_press=1;
}
else
{
right_press=0;
};

if(PINA==0xEF)
{
mode_press=1;
}
else
{
mode_press=0;
};

if(PINA==0xDF)
{
set_press=1;
}
else
{
set_press=0;
};
}