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- /*
- * cube.c
- *
- * Copyright 2011 Thomas Buck <xythobuz@me.com>
- * Copyright 2011 Max Nuding <max.nuding@gmail.com>
- * Copyright 2011 Felix Bäder <baeder.felix@gmail.com>
- *
- * This file is part of LED-Cube.
- *
- * LED-Cube 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
- * (at your option) any later version.
- *
- * LED-Cube 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 LED-Cube. If not, see <http://www.gnu.org/licenses/>.
- */
- // Uses Timer 1!
- #include <avr/io.h>
- #include <avr/interrupt.h>
- #include <stdlib.h>
- #include <util/atomic.h>
-
- #ifdef DEBUG
- #include "serial.h"
- #include "strings.h"
- #endif
- #include "cube.h"
-
- #ifndef F_CPU
- #define F_CPU 16000000L
- #endif
-
- /*
- * 24 fps, 8 layers => 192 Interrupts per second
- * We are at 16MHz, so we count to:
- * 16000000 / 192 = 83333,33...
- * We can only count to 2^16, therefore we have a second counter
- * COUNT * (COUNT2 + 1) = Realcount
- * 41666 * 2 = 83332
- * This is flickering really hard.
- *
- * COUNT2 set to 0 on the other hand, thus producing 48fps,
- * works flicker-free. Now we just return imgFlag / 2 as isFinished(),
- * so we still fake 24fps for the main program...
- */
-
- #define COUNT 41666
- #define COUNT2 0
-
- volatile uint8_t imgBuffer[8][8];
- volatile uint8_t changedFlag = 0;
- volatile uint8_t imgFlag = 0;
- volatile uint8_t layer = 0;
- volatile uint8_t toggleFlag = 0;
-
- inline void isrCall(void);
-
- volatile uint32_t timesTriggered = 0;
- volatile uint8_t warningDisplayed = 0;
-
- ISR(TIMER1_COMPA_vect) {
- if (toggleFlag >= COUNT2) {
- isrCall();
- toggleFlag = 0;
- timesTriggered++;
- } else {
- toggleFlag++;
- }
- }
-
- uint32_t getTriggerCount(void) {
- return timesTriggered;
- }
-
- void setImage(uint8_t *img) {
- uint8_t i, j;
- ATOMIC_BLOCK(ATOMIC_RESTORESTATE) {
- changedFlag = 1;
- imgFlag = 0;
- for (i = 0; i < 8; i++) {
- for (j = 0; j < 8; j++) {
- imgBuffer[i][j] = ~(img[j + (i * 8)]);
- }
- }
- }
- }
-
- void fillBuffer(uint8_t val) {
- uint8_t i, j;
- ATOMIC_BLOCK(ATOMIC_RESTORESTATE) {
- changedFlag = 1;
- imgFlag = 0;
- for (i = 0; i < 8; i++) {
- for (j = 0; j < 8; j++) {
- imgBuffer[i][j] = ~(val);
- }
- }
- }
- }
-
- uint8_t isFinished(void) {
- return (imgFlag / 2);
- }
-
- void initCube(void) {
- TCCR1B |= (1 << CS10) | (1 << WGM12); // Prescaler: 1, CTC Mode
- OCR1A = COUNT;
- TIMSK = (1 << OCIE1A); // Enable Output Compare Interrupt
- }
-
- void close(void) {
- TIMSK &= ~(1 << OCIE1A); // Disable interrupt
- }
-
- // Data is sent to 8 Fet bits...
- inline void setFet(uint8_t data) {
- PORTD = (data & ~(3)); // Doesn't interfere with serial communication...
- PORTB = (PORTB & ~(24)) | ((data << 3) & 24);
- }
-
- // Give id of latch, 0 - 7
- inline void selectLatch(uint8_t latchNr) {
- // Disable all latches
- PORTC &= ~(0xFC); // 2 - 7
- PORTB &= ~(6); // 0 & 1
-
- // Enable desired latch
- if (latchNr > 1) {
- PORTC |= (1 << latchNr);
- } else {
- PORTB |= (1 << (latchNr + 1));
- }
- }
-
- inline void setLatch(uint8_t latchNr, uint8_t data) {
- selectLatch(latchNr); // Activate current latch
- PORTA = data; // Put latch data
- asm volatile("nop"::); // Wait for latch
- }
-
- inline void isrCall(void) {
- uint8_t latchCtr = 0;
-
- if (changedFlag != 0) {
- // The picture changed. Restart!
- layer = 0;
- changedFlag = 0;
- }
- setFet(0);
- for (; latchCtr < 8; latchCtr++) {
- setLatch(latchCtr, imgBuffer[layer][latchCtr]); // Put out all the data
- }
- setFet(1 << layer);
-
- // Select next layer
- if (layer < 7) {
- layer++;
- } else {
- layer = 0;
- imgFlag++; // Finished
- }
- }
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