Индикация на двух семи сегментных двух знаковых светодиодных индикаторах через SPI

Материал из Automata.

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#include <stdint.h>                 
#include <avr/io.h>                 
#include <avr/interrupt.h>          

//MISO - RCK;
#define LATCH 0x40

                                  /*0*/ /*1*/ /*2*/ /*3*/ /*4*/ /*5*/ /*6*/ /*7*/ /*8*/ /*9*/ /*.*/
static const uint8_t LEDS[11] = { 0x03, 0x9F, 0x25, 0x0D, 0x99, 0x49, 0x41, 0x1F, 0x01, 0x09, 0xFE };
static volatile uint8_t counts[4];                                                                   
static volatile uint16_t data = 0;                                                                   
static volatile uint8_t adj = 0;                                                                     

void Indicate(uint16_t data)
{                           
   counts[3] = data % 10;  
   data /= 10;             
   counts[2] = data % 10;  
   data /= 10;             
   counts[1] = data % 10;  
   data /= 10;             
   counts[0] = data % 10;  
   data /= 10;
   
   SPCR |= _BV(SPE);
   
   register uint8_t j;
   for (j = 0; j < 4; j++)
   {
       SPDR = ( j == 1 ) ? ( LEDS[counts[j]] & LEDS[10] ) : ( LEDS[counts[j]] );
       while (!(SPSR & _BV(SPIF)));
   }
   
   SPCR &= ~_BV(SPE);
   
   PORTB |= LATCH;
   PORTB &= ~LATCH;
}



ISR (TIMER0_COMP_vect)
{
   if (adj++ % 9)
   {
       adj = 0;
       return;
   }
   
   if  (data == 10000)
       data = 0;
   
   Indicate(data++);
}

int main (void)
{
   DDRB  = 0xff;
   PORTB = 0x00;
   
   SPCR  = _BV(SPE) | _BV(MSTR) | _BV(SPR1);
   
   TCCR0 = _BV(WGM01) | _BV(CS02) | _BV(CS00);
   TIMSK = _BV(OCIE0);
   OCR0  = 78;
   //78.125 t = 0.01 s * 8/1024 MHz;
   
   
   sei();
   
   while (1);
}
Получено с http://automata.sgu.ru/wiki/%C3%90%CB%9C%C3%90%C2%BD%C3%90%C2%B4%C3%90%C2%B8%C3%90%C2%BA%C3%90%C2%B0%C3%91%E2%80%A0%C3%90%C2%B8%C3%91%C2%8F_%C3%90%C2%BD%C3%90%C2%B0_%C3%90%C2%B4%C3%90%C2%B2%C3%91%C6%92%C3%91%E2%80%A6_%C3%91%C2%81%C3%90%C2%B5%C3%90%C2%BC%C3%90%C2%B8_%C3%91%C2%81%C3%90%C2%B5%C3%90%C2%B3%C3%90%C2%BC%C3%90%C2%B5%C3%90%C2%BD%C3%91%E2%80%9A%C3%90%C2%BD%C3%91%E2%80%B9%C3%91%E2%80%A6_%C3%90%C2%B4%C3%90%C2%B2%C3%91%C6%92%C3%91%E2%80%A6_%C3%90%C2%B7%C3%90%C2%BD%C3%90%C2%B0%C3%90%C2%BA%C3%90%C2%BE%C3%90%C2%B2%C3%91%E2%80%B9%C3%91%E2%80%A6_%C3%91%C2%81%C3%90%C2%B2%C3%90%C2%B5%C3%91%E2%80%9A%C3%90%C2%BE%C3%90%C2%B4%C3%90%C2%B8%C3%90%C2%BE%C3%90%C2%B4%C3%90%C2%BD%C3%91%E2%80%B9%C3%91%E2%80%A6_%C3%90%C2%B8%C3%90%C2%BD%C3%90%C2%B4%C3%90%C2%B8%C3%90%C2%BA%C3%90%C2%B0%C3%91%E2%80%9A%C3%90%C2%BE%C3%91%E2%82%AC%C3%90%C2%B0%C3%91%E2%80%A6_%C3%91%E2%80%A1%C3%90%C2%B5%C3%91%E2%82%AC%C3%90%C2%B5%C3%90%C2%B7_SPI
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