// check the keyboard
static unsigned char check_buttons(void){
if (check_u_button(&(set_val[1]))){
if(set_val[1]>U_MAX){
set_val[1]=U_MAX;
}
return(1);
}
if (check_i_button(&(set_val[0]))){
if(set_val[0]>I_MAX){
set_val[0]=I_MAX;
}
return(1);
}
if (check_store_button()){
store_permanent();
return(2);
};
return(0);
}
int main(void)
{
int16_t dac_val=511;
int16_t cnt;
int8_t dac_dir=0;
char out_buf[21];
DDRD|= (1<<DDD0); // LED, enable PD0, LED as output
LEDOFF;
init_dac();
lcd_init();
lcd_clrscr();
lcd_puts("use U+/U-");
lcd_gotoxy(0,1);
lcd_puts("and store");
init_kbd();
delay_ms(500);
delay_ms(500);
lcd_clrscr();
lcd_puts_p(PSTR("pause"));
while (1) {
if (dac_dir==1){
dac_val++;
}
if (dac_dir==-1){
dac_val--;
}
if (dac_val>0xFFF){
dac_val=0xFFF; //max, 13bit
}
if (dac_val<0){
dac_val=0;
}
lcd_gotoxy(0,1);
itoa(dac_val,out_buf,10);
lcd_puts(out_buf);
lcd_puts(" ");
dac(dac_val);
cnt=1;
check_u_button(&cnt);
if (cnt>1){
lcd_clrscr();
// u+ pressed
lcd_puts_p(PSTR("up"));
dac_dir=1;
LEDOFF;
}
if (cnt<1){
lcd_clrscr();
// u- pressed
lcd_puts_p(PSTR("down"));
dac_dir=-1;
LEDON;
}
if (check_store_button()){
lcd_clrscr();
lcd_puts_p(PSTR("pause"));
dac_dir=0;
}
delay_ms(100);
cnt=1;
check_u_button(&cnt);
if (cnt>1){
lcd_clrscr();
// u+ pressed
lcd_puts_p(PSTR("up"));
dac_dir=1;
LEDOFF;
}
if (cnt<1){
lcd_clrscr();
// u- pressed
lcd_puts_p(PSTR("down"));
dac_dir=-1;
LEDON;
}
if (check_store_button()){
lcd_clrscr();
lcd_puts_p(PSTR("pause"));
dac_dir=0;
}
delay_ms(100);
}
return(0);
}