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