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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>
- #include <avr/pgmspace.h>
-
- #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;
-
- volatile uint32_t timesTriggered = 0;
- volatile uint8_t warningDisplayed = 0;
-
- // A fix for our mirrored 64pin cable.
- uint8_t lookUp[256] PROGMEM = { 0, 64, 128, 192, 16, 80, 144, 208, 32, 96, 160,
- 224, 48, 112, 176, 240, 4, 68, 132, 196, 20,
- 84, 148, 212, 36, 100, 164, 228, 52, 116, 180,
- 244, 8, 72, 136, 200, 24, 88, 152, 216, 40,
- 104, 168, 232, 56, 120, 184, 248, 12, 76, 140,
- 204, 28, 92, 156, 220, 44, 108, 172, 236, 60,
- 124, 188, 252, 1, 65, 129, 193, 17, 81, 145,
- 209, 33, 97, 161, 225, 49, 113, 177, 241, 5,
- 69, 133, 197, 21, 85, 149, 213, 37, 101, 165,
- 229, 53, 117, 181, 245, 9, 73, 137, 201, 25,
- 89, 153, 217, 41, 105, 169, 233, 57, 121, 185,
- 249, 13, 77, 141, 205, 29, 93, 157, 221, 45,
- 109, 173, 237, 61, 125, 189, 253, 2, 66, 130,
- 194, 18, 82, 146, 210, 34, 98, 162, 226, 50,
- 114, 178, 242, 6, 70, 134, 198, 22, 86, 150,
- 214, 38, 102, 166, 230, 54, 118, 182, 246, 10,
- 74, 138, 202, 26, 90, 154, 218, 42, 106, 170,
- 234, 58, 122, 186, 250, 14, 78, 142, 206, 30,
- 94, 158, 222, 46, 110, 174, 238, 62, 126, 190,
- 254, 3, 67, 131, 195, 19, 83, 147, 211, 35,
- 99, 163, 227, 51, 115, 179, 243, 7, 71, 135,
- 199, 23, 87, 151, 215, 39, 103, 167, 231, 55,
- 119, 183, 247, 11, 75, 139, 203, 27, 91, 155,
- 219, 43, 107, 171, 235, 59, 123, 187, 251, 15,
- 79, 143, 207, 31, 95, 159, 223, 47, 111, 175,
- 239, 63, 127, 191, 255 };
-
- ISR(TIMER1_COMPA_vect) {
- uint8_t latchCtr;
- if (toggleFlag >= COUNT2) {
-
- if (changedFlag != 0) {
- // The picture changed. Restart!
- layer = 0;
- changedFlag = 0;
- }
-
- PORTD = 0;
- PORTB &= ~(24); // Disable all Fets
-
- for (latchCtr = 0; latchCtr < 8; latchCtr++) {
- // Disable all latches
- PORTC &= ~(0xFC); // 2 - 7
- PORTB &= ~(6); // 0 & 1
-
- PORTA = imgBuffer[layer][latchCtr]; // Put latch data
-
- // Enable desired latch
- if (latchCtr > 1) {
- PORTC |= (1 << latchCtr);
- } else {
- PORTB |= (1 << (latchCtr + 1));
- }
- }
-
- // Set FET
- PORTD = (1 << layer); // PD2 to 7
- PORTB = (PORTB & ~(24)) | (((1 << layer) << 3) & 24); // PB3 & 4
-
- // Select next layer
- if (layer < 7) {
- layer++;
- } else {
- layer = 0;
- imgFlag++; // Finished
- }
-
- 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;
- toggleFlag = 0;
- for (i = 0; i < 8; i++) {
- for (j = 0; j < 8; j++) {
- imgBuffer[j][7 - i] = ~(pgm_read_byte(&(lookUp[img[j + (i * 8)]])));
- }
- }
- }
- }
-
- void fillBuffer(uint8_t val) {
- uint8_t i, j;
- ATOMIC_BLOCK(ATOMIC_RESTORESTATE) {
- changedFlag = 1;
- imgFlag = 0;
- toggleFlag = 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) {
- uint8_t x, y;
-
- TCCR1B |= (1 << CS10) | (1 << WGM12); // Prescaler: 1, CTC Mode
- OCR1A = COUNT;
- TIMSK = (1 << OCIE1A); // Enable Output Compare Interrupt
-
- fillBuffer(0); // Clear memory
- sei(); // Enable interrupts
-
- // Show test animation
- for (x = 0; x < 8; x++) {
- for (y = 0; y < 8; y++) {
- ATOMIC_BLOCK(ATOMIC_RESTORESTATE) {
- imgBuffer[x][y] &= ~(0xFF); // Set a pixel
- changedFlag = 1;
- imgFlag = 0;
- toggleFlag = COUNT2; // Ensure next interrupts starts displaying
- }
- while(imgFlag < 1); // Wait for frame to display
- }
- }
-
- cli(); // Disable interrupts
-
- timesTriggered = 0;
- imgFlag = 0;
- toggleFlag = 0;
- }
-
- void close(void) {
- TIMSK &= ~(1 << OCIE1A); // Disable interrupt
- }
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