Hallo!
Ich habe neue code geschrieben. Aber leider funktioniert es immer nicht. kann ich mal ueber high Byte und low Byte read fragen, wie man code dafuer schreiben soll.

Bin für jede Hilfe sehr dankbar!!

Mit freundlichen Grüßen

Maximilian

Code:
#include "p33EP512MU810.h"
#include "i2c.h"
#include <Initialisierung.h>
#include "Timer.h"


//Schritt 1


/*Configuring the general features of the microcontroller*/

_FGS(GSS_OFF & GWRP_OFF);
// External Oscillator
_FOSCSEL(FNOSC_PRIPLL);

_FOSC(FCKSM_CSECMD & OSCIOFNC_OFF  & POSCMD_XT);
// Clock Switching is enabled and Fail Safe Clock Monitor is disabled
// OSC2 Pin Function: OSC2 is Clock Output
// Primary Oscillator Mode: XT Crystal

_FWDT(FWDTEN_OFF);
// Watchdog Timer Enabled/disabled by user software

_FICD(ICS_PGD3 &  JTAGEN_OFF & RSTPRI_PF); 

_FPOR( BOREN_ON & ALTI2C1_OFF & ALTI2C2_OFF );
// Brown-out Reset (BOR) Detection Enable bit (BOR is enabled)
// Alternate I2C pins for I2C1 (SDA1/SCK1 pins are selected as the I/O pins for I2C1)
// Alternate I2C pins for I2C2 (SDA2/SCK2 pins are selected as the I/O pins for I2C2)


//Schritt 2

#define CFG_I2C2BRG  0x188
// (40MHz/100KHz)-2 = 0x188//I2C2=[(1/Fscl-PGD)*Fcy]-2

#define SONAR1 0xE0

unsigned int get_srf08(unsigned int SONAR);


/*** Global functions for the I2C2******************************************/
 main(void)
{
     unsigned int range1=0;
     f_Initialisierung();

    unsigned int Config1; // ConfigI2c2 represents I2C2CON register.
         Config1 = (   I2C2_ON & I2C2_IDLE_CON & I2C2_CLK_HLD &
                       I2C2_IPMI_DIS & I2C2_7BIT_ADD & I2C2_SLW_DIS &
                       I2C2_SM_DIS & I2C2_GCALL_DIS & I2C2_STR_DIS &
                       I2C2_NACK & I2C2_ACK_DIS & I2C2_RCV_DIS &
                       I2C2_STOP_DIS & I2C2_RESTART_DIS & I2C2_START_DIS
                        );

    OpenI2C2(Config1,CFG_I2C2BRG);/*The following function initializes the I2C2 bus and
                                         set the I2C2 Bus Speed to 100KHz I2C2 used to communicate with the Ultrasonic sensors*/
    IdleI2C2();

/*End Configuration I2C2*/
    while(1)
    {
        range1=get_srf08(SONAR1);
    }
 }
//Schritt 3
// Start Condition

  unsigned int get_srf08 (unsigned int SONAR)
{

    unsigned int range;  //range=Reichweiten
    unsigned char hi,lo; //high Byte,low Byte
    
 
     //StartI2C2();
        I2C2CONbits.SEN=1;         //send start bit
        while(I2C2CONbits.SEN);    //and wait fot it to clear       
     //MasterWriteI2C2(SRF08_ADDR);
        MasterWriteI2C2(0xE0);     //SRF08 I2C address
        while(I2C2STATbits.TBF);
        while(!IFS3bits.MI2C2IF);       // Wait for 9th clock cycle.
        while(I2C2STATbits.ACKSTAT);
     //MasterWriteI2C2(0x01);
        MasterWriteI2C2(0x01);    //Verstärkungsregister Adresse
        while(I2C2STATbits.TBF);
        while(!IFS3bits.MI2C2IF);       // Wait for 9th clock cycle.
        while(I2C2STATbits.ACKSTAT);       //then clear it
     //MasterWriteI2C2(0x00);
        MasterWriteI2C2(0x00);     //Verstärkung
        while(I2C2STATbits.TBF);
        while(!IFS3bits.MI2C2IF);       // Wait for 9th clock cycle.
        while(I2C2STATbits.ACKSTAT);          //then clear it
     //StopI2C2();
         I2C2CONbits.PEN=1;         //send stop bit
         while(I2C2CONbits.PEN);




     //StartI2C2();
         I2C2CONbits.SEN=1;         //send start bit
         while(I2C2CONbits.SEN);    //and wait fot it to clear
     //MasterWriteI2C2(SRF08_ADDR);
        MasterWriteI2C2(0xE0);     //SRF08 I2C address
        while(I2C2STATbits.TBF);
        while(!IFS3bits.MI2C2IF);       // Wait for 9th clock cycle.
        while(I2C2STATbits.ACKSTAT);
     //MasterWriteI2C2(0x02);
        MasterWriteI2C2(0x02);    //Reichweiten-Register Adresse
        while(I2C2STATbits.TBF);
        while(!IFS3bits.MI2C2IF);       // Wait for 9th clock cycle.
        while(I2C2STATbits.ACKSTAT);       //then clear it
     //MasterWriteI2C2(0xA0);
        MasterWriteI2C2(0xA0);     //Reichweiten=160    160*43mm+43mm = 6,9m
        while(I2C2STATbits.TBF);
        while(!IFS3bits.MI2C2IF);       // Wait for 9th clock cycle.
        while(I2C2STATbits.ACKSTAT);          //then clear it
     //StopI2C2();
         I2C2CONbits.PEN=1;         //send stop bit
         while(I2C2CONbits.PEN);




 //Schritt 4

    /*now wait for the ranging to complete. This delay is 104ms*/
     //Timer off; 16-bit mode; Prescaler 2; Input clk CPU/64

     //delay_ms(80);
        T6CON = 0x0000;
        T6CONbits.TCKPS = 2;
        // Timer6 period 419.424 ms = 2.384222171 Hz
        PR6 = 0xFFFF-0x001;         //w:?
        // 40MHz/64 = 625KHz , 625KHz/65535 = 9.537 Hz
        //                                           = 104,855 ms
        // later on 80ms required form this timer for the utrasonic
        // initializing. the calculation as it shown below:
        //
        //  PeriodofChecking80ms      65535
        // --------------------- = --------- ===> PeriodtoCheck
        //          80ms           104,855ms

        IFS2bits.T6IF = 0;                //clear old interrupt request.
        IEC2bits.T6IE = 0;                //disable interrupt.
        T6CONbits.TON = 0;                //switch timer off.


//Schritt 5

        //finally get the range form the SRF08

     //StartI2C2();
        I2C2CONbits.SEN=1;         //send start bit
        while(I2C2CONbits.SEN);    //and wait fot it to clear            
    //??????? //MasterWriteI2C2(SRF08_ADDR+1);
        MasterWriteI2C2(0xE0|0x01);     //SRF08 I2C address+Read
        while(I2C2STATbits.TBF);
        while(!IFS3bits.MI2C2IF);       // Wait for 9th clock cycle.
        while(I2C2STATbits.ACKSTAT);    //then clear it       
     //??????????????????????
        hi = MasterReadI2C2();      //read Most Significant Bit
        AckI2C2();     //start acknowledge sequence
        while(I2C2CONbits.ACKEN);//wait for ack.sequence to end;
        
        lo = MasterReadI2C2();      //read Least significant Bit       
        NotAckI2C2();     //start acknowledge sequence
        while(I2C2CONbits.ACKEN);//wait for ack.sequence to end

     //StopI2C2();
        I2C2CONbits.PEN=1;         //send stop bit
        while(I2C2CONbits.PEN);

        range = ((hi<<8)+lo);
        
  }