main.c

#define FCY 40000000

// Includes

#include <p24HJ128GP306.h>

#include <libpic30.h>

#include <spi.h>

#include <timer.h>

// Configuration

_FBS(RBS_NO_BOOT_RAM & BSS_NO_BOOT_CODE & BWRP_WRPROTECT_OFF);  // Boot Segment

_FSS(RSS_NO_SEC_RAM & SSS_NO_SEC_CODE & SWRP_WRPROTECT_OFF);  // Secure Segment

_FGS(GSS_OFF & GCP_OFF & GWRP_OFF);                // Code/Write Protect

_FOSCSEL(FNOSC_PRIPLL & IESO_OFF);                // Oscillator

_FOSC(FCKSM_CSDCMD & OSCIOFNC_OFF & POSCMD_XT);          // Clock

_FWDT(FWDTEN_OFF & WINDIS_OFF);                  // Watchdog

_FPOR(FPWRT_PWR1);                        // Power-on Reset Value

//_FICD(BKBUG_OFF & COE_OFF & JTAGEN_OFF & ICS_PGD1);        // Register FICD (with debugger)

_FICD(BKBUG_OFF & COE_ON & JTAGEN_OFF & ICS_NONE);        // Register FICD (without debugger)

unsigned char SPIsegment[] = {0x3F, 0x06, 0x5B, 0x4F, 0x66, 0x6D, 0x7D, 0x07, 0x7F, 0x6F, 0x77, 0x7C, 0x39, 0x5E, 0x79, 0x71};

unsigned int config1, config2, config3;

unsigned int x, min, sec, hun;

void __attribute__((__interrupt__)) _T1Interrupt(void) {

  hun++;

  if (hun > 99) {

    hun = 0;

    sec++;

  }

  if (sec > 59) {

    sec = 0;

    min++;

  }

  if (min > 99) {

    min = 0;

  }

  SPI1BUF = SPIsegment[min/10];

  while(SPI1STATbits.SPITBF);

  SPI1BUF = SPIsegment[min%10] | 0x80;

  while(SPI1STATbits.SPITBF);

  SPI1BUF = SPIsegment[sec/10];

  while(SPI1STATbits.SPITBF);

  SPI1BUF = SPIsegment[sec%10] | 0x80;

  while(SPI1STATbits.SPITBF);

  SPI1BUF = SPIsegment[hun/10];

  while(SPI1STATbits.SPITBF);

  SPI1BUF = SPIsegment[hun%10];

  while(SPI1STATbits.SPITBF);

  __delay32(200);

  LATFbits.LATF2 = 1;  

  __delay32(10);

  LATFbits.LATF2 = 0;

  IFS0bits.T1IF = 0;    /* Clear Timer interrupt flag */

}  

// Main Function

int main (void) {

  CLKDIV = 0x0400;  // sets Fosc to 80MHz

  PLLFBD = 38;    // resp. Fcy = 40MIPS

  TRISB = 0x0000;   // 1 = Input    0 = Ouput

  TRISF = 0x0000;

  LATB  = 0xFFFF;

// configure SPI1

  config1 =   ENABLE_SCK_PIN &

        ENABLE_SDO_PIN &

        SPI_MODE16_OFF &

        SPI_SMP_OFF &

        SPI_CKE_ON &

        SLAVE_ENABLE_OFF &

        CLK_POL_ACTIVE_HIGH &

        MASTER_ENABLE_ON &

        SEC_PRESCAL_8_1 &

        PRI_PRESCAL_1_1;

  config2 =   FRAME_ENABLE_OFF &

        FRAME_SYNC_OUTPUT &

        FRAME_POL_ACTIVE_LOW &

        FRAME_SYNC_EDGE_COINCIDE;

  config3 =   SPI_ENABLE &

        SPI_IDLE_CON &

        SPI_RX_OVFLOW_CLR;

  OpenSPI1(config1, config2, config3);

// Configure Timer1

  OpenTimer1(T1_ON & T1_IDLE_CON & T1_GATE_OFF & T1_PS_1_64 & T1_SYNC_EXT_OFF & T1_SOURCE_INT, 6250);

  ConfigIntTimer1(T1_INT_PRIOR_1 & T1_INT_ON); // -> IFS0bits.T1IF

  min = 0;

  sec = 0;

  hun = 0;

  x = 0;

  while(1) {

    LATB = 0x0001<<(hun/25);

    __delay32(1000);

//    __delay32(10000000); // 250ms

//    __delay_ms(250); //does not work see ASM-listing

  }

}