This page gives an overview of XADC driver which is available as part of the Xilinx Vivado and SDK distribution.

Introduction

The Xilinx analog mixed signal module, referred to as the XADC, is a hard macro. It has JTAG and DRP interfaces for accessing the XADC’s status and control registers in the 7-series FPGAs.
Zynq-7000 AP SoC devices add a third interface, the PS-XADC interface for the PS software to control the XADC. The Zynq-7000 AP SoC devices combine a flexible analog-to-digital converter with programmable logic to address a broad range of analog data acquisition and monitoring requirements. The XADC is part of a larger analog mixed signal (AMS) topic that is a combination of analog and digital circuits.

Source path for the driver:
https://github.com/Xilinx/embeddedsw/tree/master/XilinxProcessorIPLib/drivers/xadc/src

Driver source code is organized into different folders. Below diagram shows the sysmonpsu driver source organization

xadc
|
-- Doc - Provides the API and data structure details
|
- Examples - Reference application to show how to use the driver APIs and calling sequence
|
- Source - Driver source files

HW/IP Features

Analog-to-Digital Converters

Dual 12-bit 1 MSPS analog-to-digital converters (ADCs)
Up to 17 flexible and user-configurable analog inputs
On-chip or external reference option
On-chip temperature and power supply sensors
JTAG access to ADC measurements

PS-XADC Interface

Read and write XADC registers
Serial data transfers to/from XADC
Buffered read-write data operations
15-word by 32-bit command FIFO
15-word by 32-bit
Read Data FIFO
Programmable FIFO-level interrupts
Programmable alarm interrupts
Configured interface operations (using devcfg registers)
DRP Parallel Interface
Highest interface bandwidth
6-bit sample data

PL-JTAG Interface

Access the XADC when the PL is not programmed but is powered-up
Uses the JTAG TAP controller to access the XADC registers

Test Cases

xadcps_intr_example - This example shows the usage of the driver/device in interrupt mode to handle on-chip temperature and voltage alarm interrupts.
xadcps_polled_printf_example - This example shows the driver/device in polled mode to check the on-chip temperature and voltages.

Changelog

2016.3

None

2016.4

None.

2017.1

None

2017.2

None

2017.3

None.

2017.4

None.

2018.1

None.

2018.2

None.

2018.3

None

Xilinx Wiki

XADC Standalone driver

Table of Contents