310 lines
8.1 KiB
C
310 lines
8.1 KiB
C
#include <stdint.h> /* Standard Integer Types */
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#include <stdio.h> /* Standard IO facilities */
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#include <stdlib.h> /* General utilities */
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#include <string.h> /* Strings */
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#include <avr/io.h> /* AVR device-specific IO definitions */
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#include <util/delay.h> /* Convenience functions for busy-wait delay loops */
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#include <avr/interrupt.h> /* Interrupts */
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#include "main.h"
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#include "uart.h"
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/* global variables */
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volatile uint8_t pwr_ok; /* is power ok */
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volatile uint8_t fan; /* fan signal state, to measure tachometer */
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volatile uint8_t timer2_ovf = 0; /* to measure fan speed using timer 2 */
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static const uint16_t TIMER2_PRESCALE[8] = {0,1,8,32,64,128,256,1024}; /* timer 2 CS2[2:0] values */
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volatile uint16_t tachometer = 0; /* the tachometer time (from timer) */
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volatile uint8_t ir; /* IR signal state, to measure IR code */
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volatile uint8_t pulse_i = 1; /* pulse index */
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# define PULSE_MAX 64 /* maximum number of pulses to save */
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volatile uint16_t pulse[PULSE_MAX]; /* pulse times (from timer) */
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/* power ok interrupt */
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ISR(PCINT0_vect) { /* PCI0 Interrupt Vector for PCINT[7:0] */
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if (pwr_ok!=(PINB&(1<<PWR_OK))) { /* did the PWR_OK pin state changed */
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pwr_ok = PINB&(1<<PWR_OK); /* save new state */
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if (pwr_ok) {
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/* switch timer 2 on to start measuring the fan speed */
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puts("power ok");
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} else {
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puts("power ko");
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}
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} else if (ir!=(PINB&(1<<IR))) { /* did the IR pin state changed */
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ir = PINB&(1<<IR); /* save new state */
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if (pulse_i>0) { /* save pulse, except the first */
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pulse[pulse_i-1] = TCNT1;
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pulse[pulse_i] = 0;
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}
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if (pulse_i<PULSE_MAX-1) { /* prepare to save next pulse */
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pulse_i++;
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}
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TCNT1 = 0; /* clear timer 1 */
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}
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}
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/* fan tachometer interrupt */
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ISR(PCINT1_vect) { /* PCI0 Interrupt Vector for PCINT[14:8] */
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if (fan!=(PINC&(1<<FAN))) { /* did the FAN pin state changed */
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fan = PINC&(1<<FAN); /* save new state */
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if (fan) { /* only react to rising edge */
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tachometer = (uint16_t)(timer2_ovf<<8)+TCNT2; /* save time */
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TCNT2 = 0; /* reset timer 2 */
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timer2_ovf = 0; /* reset timer 2 */
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}
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}
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}
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/* timer 2 interrupt used to measure fan speed based on tachometer */
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ISR(TIMER2_OVF_vect) { /* timer 2 overflow interrupt vector */
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if (timer2_ovf<0xff) { /* prevent overflow */
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timer2_ovf++; /* increase tachometer counter */
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}
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}
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/* timer 1 interrupt used to measure IR pulse */
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ISR(TIMER1_COMPA_vect) { /* timer 1 OCR1A match interrupt vector */
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if (pulse_i>0) {
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pulse_i = 0;
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OCR0A = ~OCR0A;
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}
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}
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static void ioinit(void)
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{
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/* configure power */
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DDRB |= (1<<nPS_ON); /* nPS_ON is output */
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PORTB |= (1<<nPS_ON); /* switch off power supply */
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DDRB &= ~(1<<PWR_OK); /* PWR_ON (PB1/PCINT1) is input */
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pwr_ok = PINB&(1<<PWR_OK); /* save state */
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PCIFR &= ~(1<<PCIF0); /* clear interrupt flag */
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PCICR |= (1<<PCIE0); /* enable interrupt for PCINT[7:0] */
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PCMSK0 |= (1<<PCINT1); /* enable interrupt for PCINT1 */
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/* configure LED (on PD6/OC0A) */
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DDRD |= (1<<LED); /* LED is output */
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/* use timer 1 to produce a PWM */
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/* use phase correct PWM mode (because fast PWM is always on for at least 1 cycle) */
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TCCR0A &= ~(1<<WGM01);
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TCCR0A |= (1<<WGM00);
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TCCR0B &= ~(1<<WGM02);
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/* /64 prescale timer */
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TCCR0B &= ~(1<<CS02);
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TCCR0B |= (1<<CS01)|(1<<CS00);
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/* clear on match, because the pin is used as sink */
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TCCR0A |= (1<<COM0A1)|(1<<COM0A0);
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/* start with LED on */
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OCR0A = 0xff;
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/* configure FAN */
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DDRC &= ~(1<<FAN); /* FAN (PC5/PCINT13) is input */
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fan = PINC&(1<<FAN); /* save state */
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PCIFR &= ~(1<<PCIF1); /* clear interrupt flag */
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PCICR |= (1<<PCIE1); /* enable interrupt for PCINT[14:8] */
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PCMSK1 |= (1<<PCINT13); /* enable interrupt for PCINT1 */
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/* use timer 2 to measure the tachometer */
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/* use normal mode */
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TCCR2A &= ~((1<<WGM20)|(1<<WGM21));
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TCCR2B &= ~(1<<WGM22);
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/* clock/64 prescaler */
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TCCR2B |= (1<<CS22);
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TCCR2B &= ~((1<<CS21)|(1<<CS20));
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TIFR2 &= ~(1<<TOV2); /* clear timer 2 overflow interrupt flag */
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TIMSK2 |= (1<<TOIE2); /* enable timer 2 overflow interrupt */
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/* configure IR receiver */
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DDRB &= ~(1<<IR); /* IR (PB0/PCINT0) receiver is input */
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ir = PINB&(1<<IR); /* save state */
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PCIFR &= ~(1<<PCIF0); /* clear interrupt flag */
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PCICR |= (1<<PCIE0); /* enable interrupt for PCINT[7:0] */
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PCMSK0 |= (1<<PCINT0); /* enable interrupt for PCINT0 */
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/* use timer 1 to measure IR pulse */
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/* use CTC mode */
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TCCR1A &= ~((1<<WGM10)|(1<<WGM11));
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TCCR1B |= (1<<WGM12);
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TCCR1B &= ~(1<<WGM13);
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/* clock/8 prescaler, offers most precision for 15ms (up to 28.5ms) */
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TCCR1B |= (1<<CS11);
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TCCR1B &= ~((1<<CS12)|(1<<CS10));
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OCR1A = (uint32_t)(15*F_CPU)/(1000*8); /* set clear time to 15 ms (no IR toggle should be longer) */
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TIFR1 &= ~(1<<OCF1A); /* clear timer 1 overflow interrupt flag */
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TIMSK1 |= (1<<OCIE1A); /* enable timer 1 overflow interrupt */
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/* configure channels (used for powering LEDs using an nMOS) */
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DDRC |= (1<<CH1_1)|(1<<CH1_2)|(1<<CH1_3)|(1<<CH1_4)|(1<<CH1_5); /* CH1_x is output */
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PORTC &= ~((1<<CH1_1)|(1<<CH1_2)|(1<<CH1_3)|(1<<CH1_4)|(1<<CH1_5)); /* switch off CH1_x */
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DDRD |= (1<<CH2_1)|(1<<CH2_2)|(1<<CH2_3)|(1<<CH2_4)|(1<<CH2_5); /* CH2_x is output */
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PORTD &= ~((1<<CH2_1)|(1<<CH2_2)|(1<<CH2_3)|(1<<CH2_4)|(1<<CH2_5)); /* switch off CH2_x */
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/* use UART as terminal */
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uart_init();
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stdout = &uart_output;
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stdin = &uart_input;
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sei(); /* enable interrupts */
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}
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int main(void)
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{
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ioinit(); /* initialize IOs */
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char input;
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puts("LED dimmer up & running");
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_delay_ms(1000);
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while(1) {
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input = getchar();
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printf("%c\n", input);
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switch (input) {
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case 'l':
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PIND |= (1<<LED);
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printf("LED: ");
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if (PIND&(1<<LED)) {
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puts("off");
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} else {
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puts("on");
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}
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break;
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case 'a':
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printf("switching power supply ");
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if (PINB&(1<<nPS_ON)) {
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puts("on");
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} else {
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puts("off");
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}
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PINB |= (1<<nPS_ON);
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break;
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case 's':
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printf("power: ");
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if (PINB&(1<<PWR_OK)) {
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puts("ok");
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} else {
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puts("ko");
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}
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break;
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case '1':
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PINC |= (1<<CH1_1);
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printf("CH1_1: ");
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if (PINC&(1<<CH1_1)) {
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puts("on");
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} else {
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puts("off");
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}
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break;
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case '2':
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PINC |= (1<<CH1_2);
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printf("CH1_2: ");
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if (PINC&(1<<CH1_2)) {
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puts("on");
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} else {
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puts("off");
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}
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break;
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case '3':
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PINC |= (1<<CH1_3);
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printf("CH1_3: ");
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if (PINC&(1<<CH1_3)) {
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puts("on");
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} else {
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puts("off");
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}
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break;
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case '4':
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PINC |= (1<<CH1_4);
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printf("CH1_4: ");
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if (PINC&(1<<CH1_4)) {
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puts("on");
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} else {
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puts("off");
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}
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break;
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case '5':
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PINC |= (1<<CH1_5);
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printf("CH1_5: ");
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if (PINC&(1<<CH1_5)) {
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puts("on");
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} else {
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puts("off");
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}
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break;
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case '6':
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PIND |= (1<<CH2_1);
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printf("CH2_1: ");
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if (PIND&(1<<CH2_1)) {
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puts("on");
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} else {
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puts("off");
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}
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break;
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case '7':
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PIND |= (1<<CH2_2);
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printf("CH2_2: ");
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if (PIND&(1<<CH2_2)) {
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puts("on");
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} else {
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puts("off");
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}
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break;
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case '8':
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PIND |= (1<<CH2_3);
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printf("CH2_3: ");
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if (PIND&(1<<CH2_3)) {
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puts("on");
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} else {
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puts("off");
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}
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break;
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case '9':
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PIND |= (1<<CH2_4);
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printf("CH2_4: ");
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if (PIND&(1<<CH2_4)) {
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puts("on");
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} else {
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puts("off");
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}
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break;
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case '0':
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PIND |= (1<<CH2_5);
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printf("CH2_5: ");
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if (PIND&(1<<CH2_5)) {
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puts("on");
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} else {
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puts("off");
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}
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break;
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case '-':
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if (OCR0A>0) {
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OCR0A--;
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}
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printf("decreasing LED: %u\n",OCR0A);
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break;
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case '+':
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if (OCR0A<0xff) {
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OCR0A++;
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}
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printf("increasing LED: %u\n",OCR0A);
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break;
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case 't':
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if (tachometer) {
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uint16_t prescale = TIMER2_PRESCALE[TCCR2B&((1<<CS22)|(1<<CS21)|(1<<CS20))];
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if (prescale) {
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if (timer2_ovf<0xff) {
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uint32_t speed = ((60*F_CPU)/(prescale*(uint32_t)tachometer))/2; /* calculate speed. 2 pulses per revolution */
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printf("fan speed: %lurpm\n",speed);
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} else {
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printf("fan off (or not detected)\n");
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}
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} else {
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printf("fan speed measurement not started\n");
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}
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} else {
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printf("fan off (or not detected)\n");
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}
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break;
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}
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}
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return 0;
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}
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