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/*
* spreadspace avr utils
*
*
* Copyright (C) 2013-2015 Christian Pointner <equinox@spreadspace.org>
*
* This file is part of spreadspace avr utils.
*
* spreadspace avr utils is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* any later version.
*
* spreadspace avr utils is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with spreadspace avr utils. If not, see <http://www.gnu.org/licenses/>.
*/
#include <avr/io.h>
#include <avr/wdt.h>
#include <avr/interrupt.h>
#include <avr/power.h>
#include <stdio.h>
#include "util.h"
#include "led.h"
#include "usbio.h"
#define PWM_VAL OCR4B
#define PWM_MAX 160
void pwm_init(void)
{
DDRB |= (1<<PB6);
TCCR4B = 0; // make sure timer is stopped
TCCR4A = (1<<COM4B1) | (1<<PWM4B);
TCCR4D = (1<<WGM40);
TCNT4 = 0;
OCR4C = 160;
OCR4B = 80; // set duty cycle to 50:50
TCCR4B = (1<<CS41); // start timer
}
inline void pwm_set(uint8_t val)
{
PWM_VAL = val;
}
inline void pwm_inc(void)
{
if(PWM_VAL < PWM_MAX)
PWM_VAL++;
}
inline void pwm_dec(void)
{
if(PWM_VAL > 0)
PWM_VAL--;
}
void tacho_init(void)
{
DDRD &= ~(1<<PD4);
PORTD |= (1<<PD4);
TCCR1B = 0; // make sure timer is stopped
TCCR1A = 0;
TCNT1 = 0;
TIMSK1 = (1<<ICIE1);
TCCR1B = (1<<CS12); // start timer
}
ISR(TIMER1_CAPT_vect)
{
static uint16_t tacho_last_ts = 0;
uint16_t current = ICR1;
uint16_t diff = 0;
if(current > tacho_last_ts) {
diff = current - tacho_last_ts;
} else {
diff = (UINT16_MAX - tacho_last_ts) + current;
}
tacho_last_ts = current;
uint16_t rpm = 1875000 / diff;
printf("\rspeed: %6d rpm", rpm);
}
void handle_cmd(uint8_t cmd)
{
switch(cmd) {
case '+': pwm_inc(); break; // printf("pwm = %d\r\n", PWM_VAL); break;
case '-': pwm_dec(); break; // printf("pwm = %d\r\n", PWM_VAL); break;
case 'r': reset2bootloader(); break;
default: return; // printf("error\r\n"); return;
}
}
int main(void)
{
MCUSR &= ~(1 << WDRF);
wdt_disable();
cpu_init();
jtag_disable();
led_init();
usbio_init();
pwm_init();
tacho_init();
sei();
// rotary encoder
DDRB &= ~((1<<PB4) | (1<<PB5));
PORTB |= (1<<PB4) | (1<<PB5);
led_on();
for(;;) {
int16_t BytesReceived = usbio_bytes_received();
while(BytesReceived > 0) {
int ReceivedByte = fgetc(stdin);
if(ReceivedByte != EOF) {
handle_cmd(ReceivedByte);
}
BytesReceived--;
}
usbio_task();
}
}
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