Main.c


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//#define F_CPU 16000000UL

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#include <avr/io.h>

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#include <avr/interrupt.h>

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#include <util/delay.h>

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#include <math.h>

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volatile uint8_t Leds[16][8] =

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{

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  {2,2,2,2,2,2,2,2},

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  {2,20,20,20,20,20,20,2},

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  {2,20,27,27,27,27,20,2},

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  {2,20,27,34,32,27,20,2},

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  {2,20,27,32,34,27,20,2},

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  {2,20,27,34,32,27,20,2},

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  {2,20,27,32,34,27,20,2},

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  {2,20,27,34,32,27,20,2},

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  {2,20,27,32,34,27,20,2},

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  {2,20,27,34,32,27,20,2},

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  {2,20,27,32,34,27,20,2},

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  {2,20,27,34,32,27,20,2},

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  {2,20,27,32,34,27,20,2},

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  {2,20,27,27,27,27,20,2},

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  {2,20,20,20,20,20,20,2},

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  {2,2,2,2,2,2,2,2}

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};

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uint8_t FrameCount;

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ISR( TIMER0_OVF_vect ) //Overflow

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{

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  FrameCount++;

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  // Komplette Matrix einmal ausgeben, wobei nur die LED eingeschaltet

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  // werden, deren Helligkeitswert kleiner/gleich dem 'FrameCount' sind

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  for(int y = 0; y < 16; y++ )

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  {

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  int value = 0;

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    for(int x = 0; x < 8; x++ )

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    {

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      if( (Leds[y][x]) < FrameCount )

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    {

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        switch(x)

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        {

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          case 0: value = value + 1; break;

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          case 1: value = value + 2; break;

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          case 2: value = value + 4; break;

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          case 3: value = value + 8; break;

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          case 4: value = value + 16; break;

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          case 5: value = value + 32; break;

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          case 6: value = value + 64; break;

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          case 7: value = value + 128; break;

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          default: value = value + 0; break;

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        }

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    }

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    }

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  SPDR = value; // Schreibe Daten...

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  while(!(SPSR & 0b10000000)); //...bis fertig.

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  }

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  PORTB = 0b00000100; // Schreibe Daten...

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  PORTB = 0b00000000; // ...raus.

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  if(FrameCount == 35)

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  {

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    FrameCount = 0;

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  }

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}

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int main()

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{

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    DDRB = 0xFF;       // B-Pins als Ausgang definieren (Shift)

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    SPCR = 0b01010000;   // Interrupt des SPI freigegeben (Shift)

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    TIMSK = 0b00000001;   // Loese Interrupt aus (PWM)

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    TCCR0 = 0b00000001;  // Vorteiler auf 1 setzten (PWM)

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    sei();        // Schalte Interrupts ein (PWM)

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    while(1)

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    {

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    };

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}