111 lines
3 KiB
C
111 lines
3 KiB
C
/*
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* CTHN.de MiniLEDCube
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*
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* By Kai Lauterbach (klaute at web dot de) 11/2011
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*
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* Based on http://mosfetkiller.de/?s=miniledcube
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*
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* License: General Public License (GPL v3)
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*
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*/
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#include "main.h"
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/*! \brief Main loop
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*/
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int __attribute__((OS_main)) main()
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{
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// Initialize the AVR and the USB connection.
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init();
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init_usb();
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// Hauptschleife
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for (;;)
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{
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usbPoll(); // keep connected
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}
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}
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/*! \brief Initialize the AVR.
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*/
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void init()
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{
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// Init ports
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DDRB = 0b11111111; // PB0-PB7: LED 1-8 (Kathode)
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PORTB = 0b11111111; // HIGH
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DDRD = 0b01111000; // PD6: LED 9 (Kathode); PD5-PD3: A-C (Anode)
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PORTD = 0b01000000;
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// Setup Timer-Interrupt "TIMER1" compare match interrupt
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TIMSK = (1 << OCIE1A);
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// Refreshrate is 100Hz of the whole LEDCube.
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// The ISR comes up at 300Hz.
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// Set the compare value to
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// 625d = 0x271 = 0b00000010, 0b01110001
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OCR1AH = 0b00000010;
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OCR1AL = 0b01110001;
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// Set prescale to 64 and clear the counter on compare match.
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TCCR1B = (1 << CS11) | (1 << CS10) | (1 << WGM12);
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sei(); // Enable interrupts global
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}
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/*! \brief TIMER1 interruptvector, called in a frequency of 300Hz.
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*/
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ISR (TIMER1_COMPA_vect)
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{
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if (!(--delay)) // decrease the counter and check if we are done with waiting
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{
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if (frmnum == MAX_EEPROM_FRAMES)
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{
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if (mode == MODE_ANIMATION_SINGLE)
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mode = MODE_ANIMATION_STOP; // stop the animation after we have reached the 31th frame
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frmnum = 0; // always start at the first frame
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} else {
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if (mode)
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{
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// if we are in an animation mode we have to load a frame out of the eeprom
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// and increase the counter
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frame = eeprom_read_dword( &eep_anim[frmnum] );
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frmnum++;
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}
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}
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// Just shift right by 24 instead of 27 to multiply the delay by 8.
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// Possible delays are 8 16 24 32 and so on. A zero delay isn't possible.
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// Zero means that a delay of 255 happens because the delay variable was decreased first before testing
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// it's is zero value.
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delay = (frame >> 24) & 0xf8;
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}
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// !!!Don't touch the 6th bit (9th LED wire)!!!
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// PORTD = __, 9, C, B, A, D+, D-, __
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PORTD &= 0b11000111; // delete bit 3 to 6 (bit 3 to 5 = layer 0 to 2
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uint8_t tmp = level * 9; // calculate the position in the frame
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// PORTB = 1..8
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// 0 = led is on, 1 = led is off
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PORTB = ~((frame >> tmp) & 0xff);
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if ((((frame >> tmp) >> 8) & 0x01))
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PORTD &= ~(1 << 6); // turn the 9th LED on
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else
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PORTD |= (1 << 6); // turn the 9th LED off
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// set the current level to high
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// at this point the LED pins are up to date so it's
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// safe to reenable the level wire (A/B/C)
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// this prevents wierd LED flashing which is not defined
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// in the animation frame
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PORTD |= ((1 << level) << 3);
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// rotate through the 3 level
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level++;
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if (level > 2)
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level = 0;
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}
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