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/**
*
* Blinking LED ATTiny85 "hello world"
*
* Following the tutorial at:
* http://www.instructables.com/id/Honey-I-Shrunk-the-Arduino-Moving-from-Arduino-t/?ALLSTEPS
*
*/
#include <avr/io.h>
// F_CPU frequency to be defined at command line
#include <util/delay.h>
#define TRUE 1
#define FALSE 0
#define LED0 PB3
#define LED1 PB2
#define LED2 PB1
#define LED3 PB0
#define LED4 PB4
const int leds[] = {LED0, LED1, LED2, LED3, LED4};
#define LED_COUNT (sizeof(leds) / sizeof(leds[0]))
uint8_t led_states[LED_COUNT];
#define DELAY_NORMAL 100;
#define DELAY_SLOW 150;
#define DELAY_FAST 50;
const int DELAY = DELAY_NORMAL;
void led_on(int led_index)
{
PORTB |= (1 << leds[led_index]);
led_states[led_index] = 1;
}
void led_off(int led_index)
{
PORTB &= ~(1 << leds[led_index]);
led_states[led_index] = 0;
}
void setup_leds()
{
for (int i = 0; i != LED_COUNT; ++i)
{
DDRB |= (1 << leds[i]);
led_off(i);
led_states[i] = 0;
}
}
void accumulate_next(int led_index)
{
if(led_states[led_index])
{
led_off(led_index);
}
else
{
led_on(led_index);
}
_delay_ms(DELAY);
}
void accumulate()
{
for (int i = 0; i != LED_COUNT; ++i)
accumulate_next(i);
}
void accumulate_backwards()
{
for (int i = LED_COUNT - 1; i >= 0; --i)
accumulate_next(i);
}
void row_next(int led_index, int previous_led_index)
{
led_on(led_index);
led_off(previous_led_index);
_delay_ms(DELAY);
}
void row()
{
for (int i = 0; i != LED_COUNT; ++i)
{
int previous = (i + LED_COUNT - 1) % LED_COUNT;
row_next(i, previous);
}
}
void row_backwards()
{
for (int i = LED_COUNT - 1; i >= 0; --i)
{
int previous = (i + 1) % LED_COUNT;
row_next(i, previous);
}
}
void all_on()
{
for (int i = 0; i != LED_COUNT; ++i)
led_on(i);
}
void toggle_all()
{
for (int i = 0; i != LED_COUNT; ++i)
{
if(led_states[i])
led_off(i);
else
led_on(i);
}
}
void blink(int ntimes)
{
setup_leds();
for (int i = 0; i != ntimes * 2; ++i)
{
toggle_all();
_delay_ms(DELAY);
}
}
int main ()
{
setup_leds();
while (1)
{
accumulate();
accumulate_backwards();
accumulate();
accumulate_backwards();
row();
row_backwards();
row();
row_backwards();
blink(5);
}
return 0;
}