Senden über SPI bei dsPIC33EV

while (!SPI2STATbits.SRMPT);

RPOR0bits.RP20R=8;    // use RP20 / pin 12 for SDO2

TRISAbits.TRISA4=0;   // set as output -> this can be removed (possibly)

RPOR0bits.RP35R=9;    // use RP35 / pin 7 for SCLK2

TRISBbits.TRISB3=0;   // set as output -> this can be removed (possibly)

static void set_clock()

{

   int j=100;                    //sets up temporary counter

   // setup internal clock for 80MHz/40MIPS

   // 7.37/2=3.685*43=158.455/2=79.2275

   CLKDIVbits.PLLPRE=0;        // PLLPRE (N2) 0=/2

   PLLFBD=41;                  // pll multiplier (M) = +2

   CLKDIVbits.PLLPOST=0;       // PLLPOST (N1) 0=/2

   __builtin_write_OSCCONH(0x01);     // now the PLL is configured. set the value for {COSC, NOSC} with this function to switch to FRC with PLL

   __builtin_write_OSCCONL(0x01);     // Tell the CPU to perform the clock switch.

   while(j>0)                         // This loop is here to guarantee that the clock PLL has stabilized before program operation continues

   {

      if(OSCCONbits.LOCK) j--;

   }

}

static void set_pins()

{

   // some other stuff

   RPINR0bits.INT1R=47;  // use RPI47 / pin 26 for CLK-in

   TRISBbits.TRISB15=1;  // INT1/RB15 as input -> this can be removed (possibly)

   RPINR1bits.INT2R=46;  // use RPI46 / pin 25 for SYNC-in

   TRISBbits.TRISB14=1;  // RB14 / pin 25 for SYNC-in -> this can be removed (possibly)

   TRISBbits.TRISB13=1;  // RB13 / pin 24 for data A in

   TRISBbits.TRISB12=1;  // RB12 / pin 23 for data B in

   //SPI thingies

   __builtin_write_OSCCONL(OSCCON & (~(1<<6))); // clear bit 6

   RPOR0bits.RP20R=_RPOUT_SDO2;    // use RP20 / pin 12 for SDO2

   TRISAbits.TRISA4=0;             // set as output -> this can be removed (possibly)

   RPOR0bits.RP35R=_RPOUT_SCK2OUT; // use RP35 / pin 7 for SCLK2

   TRISBbits.TRISB3=0;             // set as output -> this can be removed (possibly)

   __builtin_write_OSCCONL(OSCCON | (1<<6));    // Set bit 6

   TRISBbits.TRISB4=0;   // set as output -> this can be removed (possibly)

   PORTBbits.RB4=1;      // set DAC-SYNC to HIGH

}

   INTCON2bits.GIE=1;    //enable "global" interrupts

   INTCON2bits.INT1EP=0; //interrupt INT1 on rising edge

   IFS1bits.INT1IF=0;    //Reset INT1 interrupt flag

   IEC1bits.INT1IE=1;    //Enable INT1 Interrupt Service Routine

   INTCON2bits.INT2EP=1; //interrupt INT2 on falling edge

   IFS1bits.INT2IF=0;    //Reset INT2 interrupt flag

   IEC1bits.INT2IE=1;    //Enable INT2 Interrupt Service Routine

static void init_spi()

{  

   // SPI2CON1 Register Settings

   SPI2CON1bits.DISSCK = 0; // Internal serial clock is enabled

   SPI2CON1bits.DISSDO = 0; // SDOx pin is controlled by the module

   SPI2CON1bits.MODE16 = 0; // Communication

   SPI2CON1bits.SMP = 1; // Input data is sampled at the middle of data output time

   SPI2CON1bits.CKE = 0; // Serial output data changes on transition from Idle clock state to active clock state

   SPI2CON1bits.SSEN = 0; // 0 = SSx pin is not used by the module; pin is controlled by port function

   SPI2CON1bits.CKP = 1; // Idle state for clock is a low-level;active state is a high-level

   SPI2CON1bits.MSTEN = 1; // Master mode enabled

   SPI2CON1bits.SPRE = 0b001; //Secondary prescaler value=5

   SPI2CON1bits.PPRE = 0b10; //3 //Primary prescaler=1

   SPI2CON2bits.FRMEN = 0; //0 = Framed SPIx support is disabled

   SPI2CON2bits.SPIBEN = 1; //Enhanced Buffer is enabled

   SPI2STATbits.SPIEN = 1; // Enable SPI module

   SPI2STATbits.SPIROV = 0; // Clear SPI2 receive overflow flag if set

   IFS2bits.SPI2IF = 0;              //Clear interrupt flag (no interrupt)

  //  IEC2bits.SPI2IE = 1;              //Enable SPI2 interrupts

}

static void spi2_send(const int data)

{

   volatile int recv;

   recv=SPI2BUF; // PIC expects a receive out of the buffer...

   SPI2BUF=data;

   while (!SPI2STATbits.SRMPT);

}

SPI2BUF=1;

SPI2BUF=2;

SPI2BUF=3;

SPI2BUF=4;

SPI2BUF=5;

SPI2BUF=6;

SPI2BUF=7;

SPI2BUF=8;

    while(SPI2STATbits.SPITBF);

    SPI2BUF = Data;

while (SPI2STATbits.SPIBEC > 0-meineDatenFürDenFifo)

while (SPI2STATbits.SPIBEC > 7-meineDatenFürDenFifo)