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AVR Attiny13 RGB Led Driver
/**
* AVR program to provide lighting modes for an RGB LED
* Copyright (c) 2011 Akoi Meexx (http://akoimeexx.com/)
*
* Chip type: Attiny13
* Clock frequency: Default internal clock (9.6MHz / 8 = 1.2MHz)
* +--------+
* [ (PB5) |1* 8| (VCC) Power ]
* [ Button (PB3) |2 7| (PB2) BLUE ]
* [ (PB4) |3 6| (PB1) GREEN ]
* [ Ground (GND) |4 5| (PB0) RED ]
* +--------+
*/
/**
* AVR-specific defines and includes
*/
#include <avr/io.h>
#define F_CPU 1200000UL // 1.2 MHz
// Some macros that make the code more readable
#define output_low(port,pin) port &= ~(1<<pin)
#define output_high(port,pin) port |= (1<<pin)
#define set_output(portdir,pin) portdir |= (1<<pin)
/**
* Alias our color channel pinouts
*/
#define RED PB0
#define GREEN PB1
#define BLUE PB2
/**
* Create our rgb structure and declare it below as a global
*/
typedef struct {
int red;
int green;
int blue;
} rgb;
rgb channels = { 0x00, 0x00, 0x00 };
/**
* Define our lighting modes and declare our mode global
*/
#define DEBUG_MODE 0
#define RAINBOW_MODE 1
#define SOLID_MODE 2
#define PULSE_MODE 3
int lighting_mode;
/**
* TODO: Optimize. This method just feels too 'clunky'.
*/
void rainbow_step(void) {
//Fade from blue to red
if(channels.blue > 0x00 && channels.red == 0xFF && channels.green == 0x00) {
channels.blue--;
}
if(channels.blue == 0xFF && channels.red < 0xFF && channels.green == 0x00) {
channels.red++;
}
//Fade from green to blue
if(channels.green > 0x00 && channels.blue == 0xFF && channels.red == 0x00) {
channels.green--;
}
if(channels.green == 0xFF && channels.blue < 0xFF && channels.red == 0x00) {
channels.blue++;
}
// Fade from red to green
if(channels.red > 0x00 && channels.green == 0xFF && channels.blue == 0x00) {
channels.red--;
}
if(channels.red == 0xFF && channels.green < 0xFF && channels.blue == 0x00) {
channels.green++;
}
}
/**
* TODO: Build function
*/
void solid_step(void) {
// Do nothing, the pwm running should be more than enough
}
/**
* TODO: Build function
*/
void pulse_step(void) {
//
}
/**
* Software Pulse Width Modulation for RGB
*/
void do_pwm(int r_duty, int g_duty, int b_duty, int rate) {
int i;
while (rate != 0) {
// Set our LED pins as output high
PORTB |= (1<<RED) | (1<<GREEN) | (1<<BLUE);
for (i=0; i < 255; i++) {
if (i == r_duty)
output_low(PORTB, RED);
if (i == g_duty)
output_low(PORTB, GREEN);
if (i == b_duty)
output_low(PORTB, BLUE);
}
rate--;
}
}
void init(void) {
channels.red = 0xFF;
lighting_mode = RAINBOW_MODE;
set_output(DDRB, RED);
set_output(DDRB, GREEN);
set_output(DDRB, BLUE);
}
int main(void) {
init();
while(1) {
switch (lighting_mode) {
case DEBUG_MODE:
break;
case RAINBOW_MODE:
rainbow_step();
break;
case SOLID_MODE:
solid_step();
break;
case PULSE_MODE:
pulse_step();
break;
default:
lighting_mode = RAINBOW_MODE;
}
do_pwm(channels.red, channels.green, channels.blue, 15);
}
return 0;
}
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