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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"
#include <LUFA/Drivers/Peripheral/ADC.h>
#define PWM_VAL OCR1BL
void pwm_init(void)
{
DDRB |= (1<<PB6);
TCCR1B = 0;
TCNT1 = 0;
OCR1B = 0;
TCCR1A = (1<<COM1B1) | (1<<WGM10);
TCCR1B = (1<<WGM12) | (1<<CS10);
}
inline void pwm_set(uint8_t val)
{
PWM_VAL = val;
}
inline void pwm_inc(void)
{
if(PWM_VAL < 255)
PWM_VAL++;
}
inline void pwm_dec(void)
{
if(PWM_VAL > 0)
PWM_VAL--;
}
uint8_t adc_avg;
void adc_init(void)
{
ADC_Init(ADC_FREE_RUNNING);
ADC_SetupChannel(0);
adc_avg = 0;
ADC_StartReading(ADC_REFERENCE_AVCC | ADC_RIGHT_ADJUSTED | ADC_CHANNEL0);
}
void adc_task(void)
{
if(ADC_IsReadingComplete()) {
int16_t adc_val = (ADC_GetResult() >> 4) + 193;
adc_val = (adc_val >= 255) ? 255 : adc_val;
printf("ADC: %4d\r", adc_val);
adc_avg += (adc_val > adc_avg) ? 1 : ((adc_val < adc_avg) ? -1 : 0);
pwm_set(adc_avg);
}
}
void handle_cmd(uint8_t cmd)
{
switch(cmd) {
case '0': led_off(); printf("ok\r\n"); break;
case '1': led_on(); printf("ok\r\n"); break;
case '+': pwm_inc(); printf("pwm = %d\r\n", PWM_VAL); break;
case '-': pwm_dec(); printf("pwm = %d\r\n", PWM_VAL); break;
case 'r': reset2bootloader(); break;
default: printf("error\r\n"); return;
}
}
int main(void)
{
MCUSR &= ~(1 << WDRF);
wdt_disable();
cpu_init();
jtag_disable();
led_init();
usbio_init();
pwm_init();
adc_init();
sei();
led_on();
for(;;) {
int16_t BytesReceived = usbio_bytes_received();
while(BytesReceived > 0) {
int ReceivedByte = fgetc(stdin);
if(ReceivedByte != EOF) {
handle_cmd(ReceivedByte);
}
BytesReceived--;
}
adc_task();
usbio_task();
}
}
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