matrix3.c

/*

matrix led board

ISP

  PC6 RESET
  PB5 SCK
  PB4 MISO
  PB3 MOSI

74HC138N
  PD4 A0
  PD5 A1
  PD6 A2

NJU3711
  PD7 DATA
  PB1 ~STB
  PB0 CLK
  pB7 ~CLEAR

*/

#define F_CPU 1000000UL // Clock Speed
#define BAUD 9600
#define MYUBRR (((F_CPU / (BAUD * 16UL))) - 1)

#include <avr/io.h>
#include <avr/interrupt.h>
#include <util/delay.h>
#include <stdio.h>
#include <stdlib.h>

#define sbi(PORT,BIT) PORT|=_BV(BIT)
#define cbi(PORT,BIT) PORT&=~_BV(BIT)

#define set(p,d) \
  if ((d)) { \
    sbi(p);\
  } else {\
    cbi(p);\
  }

#define DELAY       1600
#define INTERVAL    50000   // 0.05sec
#define LIMIT       100000 // 1sec

volatile uint32_t e;
volatile uint8_t m[8];

void
display()
{
  uint8_t i,j;

  for(i=0;i<8;i++) {
    /* row */
    sbi(PORTB,PB1);
    cbi(PORTB,PB7);
    switch(i) {
    case 0:
      cbi(PORTD,PD4);
      cbi(PORTD,PD5);
      cbi(PORTD,PD6);
      break;
    case 1:
      sbi(PORTD,PD4);
      cbi(PORTD,PD5);
      cbi(PORTD,PD6);
      break;
    case 2:
      cbi(PORTD,PD4);
      sbi(PORTD,PD5);
      cbi(PORTD,PD6);
      break;
    case 3:
      sbi(PORTD,PD4);
      sbi(PORTD,PD5);
      cbi(PORTD,PD6);
      break;
    case 4:
      cbi(PORTD,PD4);
      cbi(PORTD,PD5);
      sbi(PORTD,PD6);
      break;
    case 5:
      sbi(PORTD,PD4);
      cbi(PORTD,PD5);
      sbi(PORTD,PD6);
      break;
    case 6:
      cbi(PORTD,PD4);
      sbi(PORTD,PD5);
      sbi(PORTD,PD6);
      break;
    case 7:
      sbi(PORTD,PD4);
      sbi(PORTD,PD5);
      sbi(PORTD,PD6);
      break;
    }

    for(j=0;j<8;j++) {
      if(m[i]&(1<<j)) {
        sbi(PORTD,PD7);
      } else {
        cbi(PORTD,PD7);
      }
      cbi(PORTB,PB0);
      sbi(PORTB,PB0);
    }

    cbi(PORTB,PB1);
    sbi(PORTB,PB7);
    _delay_us(DELAY);
  }
}


void
_display()
{
  e = 0;
  while (e < LIMIT) {
    display();
    e += DELAY * 8;
  }
}

#define TIMEOUT (254)

void
measure()
{
  int i;
#if 1
  for(i=7;i>0;i--) {
    m[i] = m[i-1];
  }
  m[0] = random() % 256;
#else
  for(i=0;i<8;i++) {
    m[i] = i;
  }
#endif
}

int 
main()
{
  uint8_t i;

  // port b output setting
  sbi(DDRB,PB0);
  sbi(DDRB,PB1);
  sbi(DDRB,PB2);
  sbi(DDRB,PB7);

  // port d output setting
  sbi(DDRD,PD4);
  sbi(DDRD,PD5);
  sbi(DDRD,PD6);
  sbi(DDRD,PD7);

  // portc pullup
  PORTC = 0xFF;

 _delay_ms(1500);

  #if 0
  // usart setting
  /* Set baud rate */
  UBRRH = (MYUBRR>>8);
  UBRRL = MYUBRR;
  /* Enable receiver and transmitter */
  UCSRB = (1 << RXEN) | (1 << RXCIE);
  /* Set frame format: 8 data bits, 1 stop bit */
  UCSRC = (1 << URSEL) | (1 << UCSZ0) | (1 << UCSZ1);
  #endif

  // timer0
  TCNT0 = 0x00;
  TCCR0 = (0<<CS02) | (0<<CS01) | (1<<CS00); //ck/1
  sbi(SFIOR,PSR10);
 
  /* all interrupt allow */  

  for(i=0;i<8;i++) { 
    m[i] =0;
  }

  while (1) {
    measure();
    _display();
  }
  return 0;
}