LabVIEW
I2C FPGA MPU 9255
Well there are a few obvious things.
I2C is a bidirectional bus, and to achieve that, the signals are only driven active high or low when the according side is sending data. Have you added proper pull-up resistors on the data line?
Do you have a datasheet about the I2C protocol?
Based on the sensor schematic, I believe the appropriate pull-up resistors are already there. I have the sensor documentation (it's included in the ZIP folder with the project) and there is some description of I2C, but not enough for me.
For example, I also don't know how to set the sensor measurement ranges (e.g. 16g, +-2000deg/s, 15µT/LSB).
More about sensor which I'm using you can find here:
10 DOF IMU Sensor (C) - Waveshare Wiki
Actually, I2C only specifies the "device address" and the data payload specifically. The device address is generally fixed by the chip manufacturer, with sometimes a few external pins to define a few of the 7 to 10 bits of the address to allow having more than one of the same chips on the same bus and an additional bit in the address that encodes if the transfer is a read or write.
How the data payload is constructed is up to the device in question. Simple port extenders might for instance not have a register map at all but simply transfer directly the port IO pins in the data section.
More complex chips do have an internal register map that first needs to be addressed by a write access to determine which register has to be read or written to by the next bus transfer. To speed this up, I2C also defines a write/read cycle that allows setting the address and then reading the contents in one single bus transfer without the need to do a readdressing in the middle.
