i2c0 not receiving any data

Hello,

Iam trying to get the I2C0(SDA,SCL) working on my udoo(arduino side). I have used the wire slave receiver code but to no avail. I2c master is tiva-tm4c1294xl, i have no problems on the master side as i have checked by echoing back the I2C data back to the serial terminal in tiva. Tiva is sending data to my udoo. I have done bit shifting and m sending bytes which are then re-assembled at the udoo end. I wish to use this data to be able to publish it over rosserial.

Code:

#include <Wire.h>

int i=0,j=0;
void setup()
{
  Wire.begin(4);                // join i2c bus with address #4
  Wire.onReceive(receiveEvent); // register event
  Serial.begin(9600);           // start serial for output
}

int data=0x00000000;
int datad1=0x00000000;
int datad2=0x00000000;
float value;

void loop()
{
  Serial.println(data);
  delay(100);
  if (i==4)
  {
    i=0;
    datad1=data;
    if(j==2)
    {
      datad2=data;
      value = datad1 + (datad2/1000.0f);
    }
    
  }
}


// function that executes whenever data is received from master
// this function is registered as an event, see setup()
void receiveEvent(int howMany)
{
  
   
     data |= Wire.read()>>8*i;
     ++i;
     if(i==4)
     ++j;
   // receive byte as an integer
           // print the integer
}

This is the code m using for my arduino. i have even tried i2c scanner but it returned nothing, i guess it wont work if the other i2c device is a master. Anyways i have tried using 1.7K and 4.7K pullups and also without any pull-ups since due has built in pull-ups. i have tried i2c1 as well. Please advice me on how to go about troubleshooting this. Also i have set the slave address on my tiva as 0x04. Below is my relevant tiva code just in case.

Code:

void I2C8_init(void)
{
  SYSCTL_RCGCI2C_R |= 0x0100; //activate I2C8
  SYSCTL_RCGCGPIO_R |= 0x0001; //activate port A
  while((SYSCTL_PRGPIO_R&0x0001)==0) {}; //wait till PORT A is ready for access
  GPIO_PORTA_AHB_AFSEL_R |= 0x0C;
  GPIO_PORTA_AHB_ODR_R |= 0x08;
  GPIO_PORTA_AHB_PCTL_R = (GPIO_PORTA_AHB_PCTL_R&0xFFFF00FF) + 0x00002200;
  GPIO_PORTA_AHB_DEN_R |= 0x0C;
  I2C8_MCR_R = 0x00000010;
  I2C8_MTPR_R = TPR;

}

uint32_t I2C_send(uint8_t slave, int8_t data)
{
  while(I2C8_MCS_R&0x00000001){};
  I2C8_MSA_R = (slave<<1)&0xFE;
  I2C8_MSA_R &= ~0x01;
  I2C8_MDR_R = data&0xFF;
  I2C8_MCS_R = (I2C_MCS_START | I2C_MCS_RUN);
  while(I2C8_MCS_R&0x00000001){};

//if((I2C8_MCS_R& (I2C_MCS_DATACK | I2C_MCS_ADRACK | I2C_MCS_ERROR)) != 0)
//{
 //return (I2C8_MCS_R& (I2C_MCS_DATACK | I2C_MCS_ADRACK | I2C_MCS_ERROR));
//}

return (I2C8_MCS_R& (I2C_MCS_DATACK | I2C_MCS_ADRACK | I2C_MCS_ERROR));

} 

void I2C_send32(int_fast32_t A)
{
 int8_t data[4],i;
 for(i=0;i<4;i++)
  {
    data[i] = (A<<i*8);
    I2C_send(0x04,data[i]);
    UARTprintf("  Sending: '%3d'  . . .  ", data[i]);
   }

}

 

Please could anyone help me with this. It is really important for me to get this working