Hi all I am using the i2C IP Core. In NIOS i would like to get data from an Bosch BME280.

Hi Anand

Oh i found the wiring issue... (unbelivable :( )

However, now i`m back at my initial problem, that the slave sends me some data that i am not expecting.

In the attachment is an oscilloscope picture, communication via NIOS2. The Slave sends me wrong data, but i a don`t know why and how i can control that from NIOS. (An osci picture from an working communication via arduino is in my first post)

I thought it is a missing initialization step but i can`t find any difference to the examples from Bosch.

      alt_u32 txbuffer[0x200];
 
      alt_u32 rxbuffer[0x200];
      txbuffer[0] = 0xFA; //MSB
      txbuffer[1] = 0xFB; //LSB
      txbuffer[2] = 0xFC; //XLSB
 
  	while (1)
  	{
  		status = alt_avalon_i2c_master_tx_rx(i2c_dev, txbuffer, 1, rxbuffer, 3,    ALT_AVALON_I2C_NO_INTERRUPTS);
 
        usleep(1000000);
    }