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#include "avr.h"
#include "adc.h"
#include "global.h"
#include "util.h"
#include <stdint.h>
int getButton() {
uint16_t val = getADCValue(7);
if(val < 144) return 5;
if(val < 228) return 4;
if(val < 304) return 3;
if(val < 376) return 2;
if(val < 600) return 1;
return 0;
}
void waitForButton(int i) {
while(getButton() != CLAMP(0, i, 5));
while(getButton() != 0);
}
void beep(unsigned long freq) {
const int prescalers[7] = {1, 8, 32, 64, 128, 256, 1024};
for(int i = 0; i < 7; i++) {
if(F_CPU/freq/2/prescalers[i] <= 256) {
TCCR2 = (TCCR2&~0x07)|(i+1);
OCR2 = F_CPU/freq/2/prescalers[i] - 1;
return;
}
}
beepOff();
}
void beepOff() {
TCCR2 &= ~0x07;
}
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