잔상효과/persistence of vision2

#include <MsTimer2.h>
#include <avr/io.h>
#include <avr/pgmspace.h>

#define PARSE(pattern) ((pattern>>14) & 0b111111), ((pattern>>8) & 0b111111), (pattern & 0b11111111)

const uint8_t pov_pattern[] PROGMEM = {
    PARSE( 0b00000000000000000000 ),
    PARSE( 0b00001111100000000000 ),
    PARSE( 0b00111111110000000000 ),
    PARSE( 0b00011111111100000000 ),
    PARSE( 0b00011111110001100000 ),
    PARSE( 0b00000000000000010000 ),
    PARSE( 0b00000000000000001000 ),
    PARSE( 0b00000000000000000100 ),
    PARSE( 0b00000000000000000010 ),
    PARSE( 0b00000000000000000000 ),
    PARSE( 0b00000000000000000010 ),
    PARSE( 0b00000000000000000001 ),
    PARSE( 0b00000000000000000010 ),
    PARSE( 0b00000000000000000000 ),
    PARSE( 0b00000000000000000010 ),
    PARSE( 0b00000000000000000010 ),
    PARSE( 0b00000000000000000100 ),
    PARSE( 0b00000000000000001000 ),
    PARSE( 0b00000000000000010000 ),
    PARSE( 0b00011011011000100000 ),
    PARSE( 0b00111111111011000000 ),
    PARSE( 0b00011111110000000000 ),
    PARSE( 0b00011111100000000000 ),
    PARSE( 0b00000101000000000000 ),
};

void blink() {
	static uint16_t index = 0;

	PORTC = pgm_read_byte(pov_pattern+(index++));
	PORTB = pgm_read_byte(pov_pattern+(index++));
	PORTD = pgm_read_byte(pov_pattern+(index++));

	if (index >= sizeof(pov_pattern)) { index = 0; }
}

void setup() {
	DDRD = 0b11111111; // set digital  0- 7 to output
	DDRB = 0b00111111; // set digital  8-13 to output
	DDRC = 0b00111111; // set digital 14-19 to output (coincidences with analog 0-5)

	MsTimer2::set(2, blink);
	MsTimer2::start();
}

void loop() { }

import sys
from PIL import Image

# double check that there is at least one argument (the file name)
if len(sys.argv) != 2:
    print "Please specify a source filename"
    sys.exit(-1)

# determine source file name
sourcefilename = sys.argv[1]
# strip extension
name = sourcefilename.split(".")[0]

# let PIL determine the proper graphics file type
image = Image.open(sourcefilename)

# convert image to black and white
image = image.convert("1")

# get hold of image size
(xsize, ysize) = image.size
# ensure height is 20 pixels (=number of LEDs)
if ysize != 20:
    print "Image height must be 20 pixels but is {0} pixels".format(ysize)

# output common start of program
print """#include <MsTimer2.h>
#include <avr/io.h>
#include <avr/pgmspace.h>

#define PARSE(pattern) ((pattern>>14) & 0b111111), ((pattern>>8) & 0b111111), (pattern & 0b11111111)

uint8_t const pov_pattern[] PROGMEM = {"""

# generate the bit pattern for the LEDs
for x in range(0, xsize):
    line = "    PARSE( 0b"
    for y in range(0, ysize):
        line = line + ('0' if image.getpixel((x, ysize-1-y)) != 0 else '1')
    line = line + " ),"

    print line

# output common end of program
print """};

void blink() {
    static uint16_t index = 0;

    PORTC = pgm_read_byte(pov_pattern+(index++));
    PORTB = pgm_read_byte(pov_pattern+(index++));
    PORTD = pgm_read_byte(pov_pattern+(index++));

    if (index >= sizeof(pov_pattern)) { index = 0; }
}

void setup() {
    DDRD = 0b11111111; // set digital  0- 7 to output
    DDRB = 0b00111111; // set digital  8-13 to output
    DDRC = 0b00111111; // set digital 14-19 to output (coincidences with analog 0-5)

    MsTimer2::set(2, blink);
    MsTimer2::start();
}

void loop() { }
"""