#include "header.h"

void int_to_hex_string(uint64_t value, char *out, uint8_t num_digits) {
    for (uint8_t i = 0; i < num_digits; ++i) {
        uint8_t shift = (num_digits - 1 - i) * 4;
        out[i] = INT_TO_HEX_CHAR((value >> shift) & 0x0F);
    }
    out[num_digits] = '\0';
}

// description
int main() {
    const char buffer[4];
	SREG |= ENABLE_GLOBAL_INTERRUPT;												// 7.3.1 : Status Register, bit 7 : I – Global Interrupt Enable
	uart_init();
	adc_init();

	while(1) {
        uint16_t value = adc_read(0);												// Read from ADC0 (A0)
		int_to_hex_string(value, buffer, 3);
        uart_printstr_endl(buffer);
        _delay_ms(20);																// Wait 20ms
	}
}

// ISR(ADC_vect) {		// Table 12-6 : interrupt vector for ADC Conversion Complete
// }