Is there a way to configure the Zynq PS I2C controller to send ACK/NACK signals from a user application?
The Zynq PS I2C controller can be configured to automatically send ACK/NACK signals in response to data bytes that are received on the bus.
This behavior is configured by setting the ACK_EN signal within the IIC.Control_Reg[0/1] register.
The Zynq PS I2C controller cannot be used to send ACK/NACK signals arbitrarily or "at will" from a software application.
If the application requires this kind of behavior then this behavior needs to be designed into the user application.