I2C-Schnittstelle auf Tiva

Auf eine Tiva (Texas Instruments Cortex-M4F-ARM) TM4C129XNCZAD ich habe ein problem mit I2C-Schnittstelle. Ich habe aktiviert sowohl ein master auf dem I2C-Modul 4-thru-Anschluss K und einem slave auf dem I2C-Modul 6-thru-Anschluss B. ich habe beide miteinander verbunden I2C-Module. Mit Texas Instruments Treiber-Bibliothek, die ich versuchte, senden von 1 byte mit I2C_MASTER_CMD_SINGLE_SEND Befehl. Ich verbringe viel Zeit damit es funktioniert, aber SCK-Linie hält Niedrigen logischen Pegel. Ich folgte genau TivaWare™ Peripheral Driver Library USER ' S GUIDE, aber die Kommunikation funktioniert nicht. Hat jemand etwas Erfahrung damit?

Da ist mein code:

#include <stdint.h>
#include <stdbool.h>
#include "inc/hw_i2c.h"
#include "inc/hw_memmap.h"
#include "inc/hw_types.h"
#include "driverlib/gpio.h"
#include "driverlib/i2c.h"
#include "driverlib/pin_map.h"
#include "driverlib/sysctl.h"
#include "inc/tm4c129xnczad.h"

#define SLAVE_ADDRESS 0x3C

void  delay  (void)
{
    volatile uint32_t ui32Loop; 
    for(ui32Loop = 0; ui32Loop < 200000; ui32Loop++);
}

volatile  uint32_t  result;

int  main  (void)
{
    SysCtlClockSet(SYSCTL_SYSDIV_1 | SYSCTL_USE_OSC | SYSCTL_OSC_MAIN | SYSCTL_XTAL_16MHZ); 
    //
    //Enable the GPIO port that is used for the on-board LED.
    //
    SYSCTL_RCGCGPIO_R = SYSCTL_RCGCGPIO_R3 | SYSCTL_RCGCGPIO_R9 | SYSCTL_RCGCGPIO_R1;
    //
    //Do a dummy read to insert a few cycles after enabling the peripheral.
    //
    result = SYSCTL_RCGCGPIO_R;
    //
    //Enable the GPIO pin for the LED (PD3).  Set the direction as output, and
    //enable the GPIO pin for digital function.
    //
    GPIO_PORTD_AHB_DIR_R = 0x8;
    GPIO_PORTD_AHB_DEN_R = 0x8;
    GPIO_PORTK_DEN_R = 0xC0;        //Enable Port K for I2C module 4

    GPIO_PORTB_AHB_DEN_R = 0xC0;    //Enable Port B for I2C module 6

    SYSCTL_RCGCI2C_R = (1 << 4) | (1 << 6);  //Mode Clock Gating Control for I2C modules 4 and 6
    GPIO_PORTK_AFSEL_R = 0xC0;      //Alternate Function Select PK6, PK7
    GPIO_PORTB_AHB_AFSEL_R = 0xC0;  //Alternate Function Select PB6, PB7
    GPIOPinConfigure(GPIO_PK6_I2C4SCL);
    GPIOPinConfigure(GPIO_PK7_I2C4SDA);
    GPIOPinConfigure(GPIO_PB6_I2C6SCL);
    GPIOPinConfigure(GPIO_PB7_I2C6SDA);

    GPIOPinTypeI2C(GPIO_PORTK_BASE, 7);       //Configurtes SDA
    GPIOPinTypeI2CSCL(GPIO_PORTK_BASE, 6);    //Configurtes SCL
    GPIOPinTypeI2C(GPIO_PORTB_BASE, 7);       //Configurtes SDA
    GPIOPinTypeI2CSCL(GPIO_PORTB_BASE, 6);    //Configurtes SCL

    I2CMasterInitExpClk(I2C4_BASE, SysCtlClockGet(), false);

    I2CSlaveEnable(I2C6_BASE);
    I2CSlaveInit(I2C6_BASE, SLAVE_ADDRESS);
    I2CMasterSlaveAddrSet(I2C4_BASE, SLAVE_ADDRESS, false);
    //
    //Loop forever.
    //
    while(1)
    {
        //
        //Turn on the LED.
        //
        GPIO_PORTD_AHB_DATA_R |= 0x8;

        I2CMasterDataPut(I2C4_BASE, 0x33);
        I2CMasterControl(I2C4_BASE, I2C_MASTER_CMD_SINGLE_SEND);
        //
        //Wait until the slave has received and acknowledged the data.
        //
        while(!(I2CSlaveStatus(I2C6_BASE) & I2C_SLAVE_ACT_RREQ));
        //
        //Read the data from the slave.
        //
        result = I2CSlaveDataGet(I2C6_BASE);
        //
        //Wait until master module is done transferring.
        //
        while(I2CMasterBusy(I2C4_BASE));
        //
        //Delay for a bit.
        //
        delay ();
        //
        //Turn off the LED.
        //
        GPIO_PORTD_AHB_DATA_R &= ~(0x8);
        //
        //Delay for a bit.
        //
        delay ();
    }
}