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/*
* Copyright (C) 2016 by Daniel Friesel
*
* License: You may use, redistribute and/or modify this file under the terms
* of either:
* * The GNU LGPL v3 (see COPYING and COPYING.LESSER), or
* * The 3-clause BSD License (see COPYING.BSD)
*
*/
#include <avr/io.h>
#include <avr/interrupt.h>
#include <avr/pgmspace.h>
#include <stdlib.h>
#include "display.h"
#include "font.h"
#include "storage.h"
Display display;
Display::Display()
{
char_pos = -1;
}
void Display::disable()
{
TIMSK0 &= ~_BV(TOIE0);
PORTB = 0;
PORTD = 0;
}
void Display::enable()
{
// Ports B and D drive the dot matrix display -> set all as output
DDRB = 0xff;
DDRD = 0xff;
// Enable 8bit counter with prescaler=8 (-> timer frequency = 1MHz)
TCCR0A = _BV(CS01);
// raise timer interrupt on counter overflow (-> interrupt frequency = ~4kHz)
TIMSK0 = _BV(TOIE0);
}
void Display::multiplex()
{
/*
* To avoid flickering, do not put any code (or expensive index
* calculations) between the following three lines.
*/
PORTB = 0;
PORTD = disp_buf[active_col];
PORTB = _BV(active_col);
if (++active_col == 8) {
active_col = 0;
if (++update_cnt == update_threshold) {
update_cnt = 0;
need_update = 1;
}
}
}
void Display::update() {
uint8_t i, glyph_len;
uint8_t *glyph_addr;
if (need_update) {
need_update = 0;
if (status == RUNNING) {
if (current_anim->type == AnimationType::TEXT) {
/*
* Scroll display contents to the left/right
*/
if (current_anim->direction == 0) {
for (i = 0; i < 7; i++) {
disp_buf[i] = disp_buf[i+1];
}
} else if (current_anim->direction == 1) {
for (i = 7; i > 0; i--) {
disp_buf[i] = disp_buf[i-1];
}
}
/*
* Load current character
*/
glyph_addr = (uint8_t *)pgm_read_ptr(&font[current_anim->data[str_pos]]);
glyph_len = pgm_read_byte(&glyph_addr[0]);
char_pos++;
if (char_pos > glyph_len) {
char_pos = 0;
if (current_anim->direction == 0)
str_pos++;
else
str_pos--; // may underflow, but that's okay
}
/*
* Append one character column (or whitespace if we are
* between two characters)
*/
if (current_anim->direction == 0) {
if (char_pos == 0) {
disp_buf[7] = 0xff; // whitespace
} else {
disp_buf[7] = ~pgm_read_byte(&glyph_addr[char_pos]);
}
} else {
if (char_pos == 0) {
disp_buf[0] = 0xff; // whitespace
} else {
disp_buf[0] = ~pgm_read_byte(&glyph_addr[glyph_len - char_pos + 1]);
}
}
} else if (current_anim->type == AnimationType::FRAMES) {
for (i = 0; i < 8; i++) {
disp_buf[i] = ~current_anim->data[str_pos+i];
}
str_pos += 8;
}
if (current_anim->direction == 0) {
/*
* Check whether we reached the end of the pattern
* (that is, we're in the last chunk and reached the
* remaining pattern length)
*/
if ((str_chunk == ((current_anim->length - 1) / 128))
&& (str_pos > ((current_anim->length - 1) % 128))) {
str_chunk = 0;
str_pos = 0;
if (current_anim->delay > 0) {
status = PAUSED;
update_threshold = 244;
}
if (current_anim->length > 128) {
storage.loadChunk(str_chunk, current_anim->data);
}
/*
* Otherwise, check whether the pattern is split into
* several chunks and we reached the end of the chunk
* kept in current_anim->data
*/
} else if ((current_anim->length > 128) && (str_pos >= 128)) {
str_pos = 0;
str_chunk++;
storage.loadChunk(str_chunk, current_anim->data);
}
} else {
/*
* In this branch we keep doing str_pos--, so check for
* underflow
*/
if (str_pos >= 128) {
/*
* Check whether we reached the end of the pattern
* (and whether we need to load a new chunk)
*/
if (str_chunk == 0) {
if (current_anim->length > 128) {
str_chunk = (current_anim->length - 1) / 128;
storage.loadChunk(str_chunk, current_anim->data);
}
if (current_anim->delay > 0) {
str_pos = 0;
status = PAUSED;
update_threshold = 244;
} else {
str_pos = (current_anim->length - 1) % 128;
}
/*
* Otherwise, we reached the end of the active chunk
*/
} else {
str_chunk--;
storage.loadChunk(str_chunk, current_anim->data);
str_pos = 127;
}
}
}
} else if (status == PAUSED) {
str_pos++;
if (str_pos >= current_anim->delay) {
if (current_anim->direction == 0)
str_pos = 0;
else if (current_anim->length <= 128)
str_pos = current_anim->length - 1;
else
str_pos = (current_anim->length - 1) % 128;
status = RUNNING;
update_threshold = current_anim->speed;
}
}
}
}
void Display::reset()
{
for (uint8_t i = 0; i < 8; i++)
disp_buf[i] = 0xff;
update_cnt = 0;
str_pos = 0;
str_chunk = 0;
char_pos = -1;
need_update = 1;
status = RUNNING;
}
void Display::show(animation_t *anim)
{
current_anim = anim;
reset();
update_threshold = current_anim->speed;
if (current_anim->direction == 1) {
if (current_anim->length > 128) {
str_chunk = (current_anim->length - 1) / 128;
storage.loadChunk(str_chunk, current_anim->data);
}
str_pos = (current_anim->length - 1) % 128;
}
}
/*
* Current configuration:
* One interrupt per 256 microseconds. The whole display is refreshed every
* 2048us, giving a refresh rate of ~500Hz
*/
ISR(TIMER0_OVF_vect)
{
display.multiplex();
}
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