mib_neuralizer/main.c

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#include <avr/io.h>
#include <util/delay.h>
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#define PIN_LED 0b1000
#define PIN_BUTTON 0b0001
#define PIN_TRIM 0b0001
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void init_ports(void) {
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// all outputs, swallows noise
DDRB = 0xff;
DDRC = 0xff;
DDRD = 0xff;
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DDRD |= PIN_LED;
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PORTB |= PIN_BUTTON; // pull-up
DDRB &= ~PIN_BUTTON;
DDRC &= ~PIN_TRIM;
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}
void init_pwm(void) {
// page 84
// 7-6: ouput A, 5-4: output B, 3-2: res, 1-0: waveform
TCCR2A = 0b00100011;
// 7-6: force output A/B, 5-4: res, 3: waveform, 2-0: clock source
TCCR2B = 0b01000001;
// duty
OCR2B = 0;
}
void deinit_pwm(void) {
TCCR2A = 0;
TCCR2B = 0;
OCR2B = 0;
}
void pwm_fade_in(int until, int step) {
int i;
for (i = 0; i < until; i += step) {
OCR2B = i;
_delay_ms(0.5);
}
}
void pwm_fade_out(int until, int step) {
int i;
for (i = OCR2B; i > until; i -= step) {
OCR2B = i;
_delay_ms(0.25);
}
}
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/*
int analog_read(void) {
ADCSRA |= ADEN;
ADCSRA |= ADSC;
}*/
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int main(void) {
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init_ports();
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while (1) {
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if (!(PINB & PIN_BUTTON)) {
init_pwm();
pwm_fade_in(0x7f >> 5, 1);
_delay_ms(300);
OCR2B = 0x7f >> 3;
_delay_ms(150);
pwm_fade_out(32, 4);
_delay_ms(50);
pwm_fade_out(0, 4);
}
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deinit_pwm();
PORTD &= ~PIN_LED;
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}
return 0;
}