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42 lines
1.2 KiB
C

// Quick Demo of light sensor
// ------- Preamble -------- //
#include <avr/io.h>
#include <util/delay.h>
#include "pinDefines.h"
// -------- Functions --------- //
static inline void initADC0(void) {
ADMUX |= (1 << REFS0); /* reference voltage on AVCC */
ADCSRA |= (1 << ADPS2); /* ADC clock prescaler /16 */
ADCSRA |= (1 << ADEN); /* enable ADC */
}
int main(void) {
// -------- Inits --------- //
uint8_t ledValue;
uint16_t adcValue;
uint8_t i;
initADC0();
LED_DDR = 0xff;
// ------ Event loop ------ //
while (1) {
ADCSRA |= (1 << ADSC); /* start ADC conversion */
loop_until_bit_is_clear(ADCSRA, ADSC); /* wait until done */
adcValue = ADC; /* read ADC in */
/* Have 10 bits, want 3 (eight LEDs after all) */
ledValue = (adcValue >> 7);
/* Light up all LEDs up to ledValue */
LED_PORT = 0;
for (i = 0; i <= ledValue; i++) {
LED_PORT |= (1 << i);
}
_delay_ms(50);
} /* End event loop */
return 0; /* This line is never reached */
}