Reading Data from PMOD ADC through I2C

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Jay C
Jay C on 16 Nov 2020
Answered: Wang Chen on 30 Jun 2021
I am trying to read data PMOD ADC (Digilent AD2) which uses I2C using HDL Coder for a Zynq-7000 FPGA (ZedBoard).
I found a documentation on the I2C Core Generation for Audio Codec Chip from the following link:
This document states that "I2C Master Controller only support I2C write and doesn't support I2C readback". Does this mean that I can't use this IP for interfacing with all devices that communicate data with FPGA through I2C (e.g. sensor, ADC)? Or does "I2C readback" mean something different from "reading data through I2C"? I am wondeirng if anyone knows if there is an I2C controller example that I could use to read data through I2C interface from ADC.

Answers (1)

Wang Chen
Wang Chen on 30 Jun 2021
Hi Jay,
Yes, I2C readback need some extra logic. The HDL Coder example model you mentioned only do I2C write.
As Walter mentioned, the SoC Blockset I2C Master block can support both read and write on I2C bus.

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