Miroslav Škoda - MAX7219 - čísla

/*
 * M328P-matrix-7219-text.c
 *
 * Created: 13. 12. 2019 22:17:17
 * Author : martin
 */

#define F_CPU 16000000ul
#include <avr/io.h>
#include <util/delay.h>

#define NUMMAX  4   // sem dej po4et MAXu za sebou
#define CLK_HIGH()  PORTB |= (1<<PB5)
#define CLK_LOW()   PORTB &= ~(1<<PB5)
#define CS_HIGH()   PORTB |= (1<<PB2)
#define CS_LOW()    PORTB &= ~(1<<PB2)
#define DATA_HIGH() PORTB |= (1<<PB3)
#define DATA_LOW()  PORTB &= ~(1<<PB3)
#define GPIO_INIT() DDRB |= (1<<PB5) | (1<<PB3) | (1<<PB2)

void spi_send(uint8_t data)
{
  uint8_t i;
  for (i = 0; i < 8; i++, data <<= 1)
  {
    CLK_LOW();
    if (data & 0x80)
    DATA_HIGH();
    else
    DATA_LOW();
    CLK_HIGH();
  }

}

void max7219_writec(uint8_t high_byte, uint8_t low_byte)
{
  CS_LOW();
  spi_send(high_byte);
  spi_send(low_byte);
  CS_HIGH();
}

void max7219_init(void)
{
  GPIO_INIT();
  for (uint8_t a=1; a<=NUMMAX; a++)
  {
    // Decode mode: none
    max7219_writec(0x09, 0xff);
    // Intensity: 3 (0-15)
    max7219_writec(0x0A, 5);
    // Scan limit: All "digits" (rows) on
    max7219_writec(0x0B, 7);
    //Shutdown register: Display on
    max7219_writec(0x0C, 1);
    // Display test: off
    max7219_writec(0x0F, 0);
  }
}


int main(void)
{
  max7219_init();
  // ALL OFF
  for (uint8_t b=1; b<=8; b++)
    for (uint8_t a=1; a<=NUMMAX; a++)
      max7219_writec(b, 0);

  while (1)
  {
    // Vypis na mista 1-8
    for (uint8_t b=1; b<=8; b++)
    {
      for (uint8_t a=0; a<=9; a++)
      {
        for (uint8_t d=1; d<=NUMMAX; d++)
          max7219_writec(9-b, b); // 9-b vypisujeme zleva
        _delay_ms(100);
      }
      _delay_ms(100);
    }
    // smazani
    for (uint8_t b=1; b<=8; b++)
    {
      for (uint8_t a=1; a<=NUMMAX; a++)
        max7219_writec(b, 0);
    }
    _delay_ms(1000);
  }
}