Forum Discussion

gbessa's avatar
gbessa
Icon for New Contributor rankNew Contributor
2 years ago
Solved

I2C Problem - Cyclone 10 GX dev kit

I'm using Cyclone 10 GX Development Kit and I'm trying to access (read/write) to the I2C I/O expander that interfaces with the SFP peripheral signals. This is very important to me because I need to...
  • gbessa's avatar
    gbessa
    2 years ago

    Hi,

    The problem is solved.

    The I2C slave device does not allow a read like I was doing. First there should be a write before the read. It has a specific pattern for each operation, concerning if it's a read or write and concerning the register that is accessed.
    These details are explained in the datasheet of the I2C external device (TI TCA9534PWR): https://www.ti.com/lit/gpn/tca9534

lixy's avatar
lixy
Icon for Contributor rankContributor
2 years ago

Hi there,


Happy to hear that the problem is resolved and thanks for sharing the root cause of the problem.


Thanks & Regards,

Xiaoyan