AD4692 no-OS Example Project

See projects/ad4692_ardz (doxygen) for the Doxygen documentation.

The EVAL-AD4692-ARDZ is an Arduino-compatible evaluation board for the AD4692 family of compact, Easy Drive, 16-bit MUX SAR ADCs. These devices combine per-channel accumulators, a flexible channel sequencer, and an internal oscillator with five selectable operating modes, making them well suited for space-constrained precision measurement applications such as optical transceiver modules and multi-channel control loops.

The evaluation board connects to a host MCU via the Arduino shield interface. These examples target the AD-APARD32690-SL rapid prototyping platform, which is built around the MAX32690 microcontroller.

The following devices are supported and share the same project:

Device	Channels	Max Sample Rate
AD4692	16	1 MSPS
AD4691	16	500 kSPS
AD4694	8	1 MSPS
AD4693	8	500 kSPS

To select the target device, change the id field in ad4692_ip inside common_data.c.

Applications

Optical transceiver module monitoring
Multi-channel industrial control loops
Precision instrumentation
Data acquisition systems

No-OS Supported Examples

The initialization data used in the examples is taken from: Project Common Data Path

Each example below is selected with its own --variant (basic, iio, iio_trigger) and built for the ad-apard32690-sl board. See the Build Command section for the exact invocations.

The operating mode is selected via the mode field in ad4692_ip in common_data.c. The default is AD4692_MANUAL_MODE, which works for all three examples. Refer to the AD4692 driver documentation for a description of all five operating modes and their hardware requirements.

Basic example

Initializes the AD4692 and reads two channels using ad4692_get_ch(), printing the raw values over UART. ad4692_get_ch() handles sequencer configuration, sampling, and readback internally for every operating mode.

For oscillator-driven modes (CNV Burst, Autonomous, SPI Burst) the example first sets the internal OSC to 500 kHz. No additional setup is required for Manual or CNV Clock modes.

IIO example

Launches an IIOD server on the board so that any LibIIO client can connect, configure the ADC, and stream data. Data acquisition uses the submit_buffer path, which is compatible with all five operating modes and does not require a hardware trigger.

If you are not familiar with ADI IIO Application, please take a look at: IIO No-OS

If you are not familiar with ADI IIO-Oscilloscope Client, please take a look at: IIO Oscilloscope

IIO trigger example

Extends the IIO example with a hardware trigger driven by the GPIO0 output of the AD4692. In every non-manual operating mode the device asserts GPIO0 at the end of each conversion sequence (as DATA_READYb in CNV Clock, CNV Burst, and SPI Burst modes; as ADC_BUSY in Autonomous mode). Both signals produce a falling edge at conversion complete, which fires the MAX32690 GPIO interrupt and invokes the IIO trigger handler to read and push the accumulated channel data.

Note

AD4692_MANUAL_MODE is not compatible with this example because the IIO driver does not register a trigger handler for manual mode. All other modes work correctly.

The trigger is configured for a falling-edge interrupt on the GPIO0 pin (P3.0 on the MAX32690, connected to the DREADY/BUSY signal of the EVAL-AD4692-ARDZ).

No-OS Supported Platforms

Maxim Platform

Used hardware

Connections

The EVAL-AD4692-ARDZ plugs directly into the Arduino-compatible headers of the AD-APARD32690-SL. The following MAX32690 peripherals are used:

Function	MAX32690 Peripheral	Notes
SPI (MOSI/MISO/SCK/CS)	SPI4, CS0	Mode 3 (CPOL=1, CPHA=1), up to 1 MHz
RESET	P1.6 (GPIO)	Active-low hardware reset
DREADY / ADC_BUSY	P3.0 (GPIO input / IRQ)	Interrupt source for trigger example
CNV (PWM)	PWM2	Required for CNV Clock and CNV Burst modes only
UART (debug)	UART0	57600 baud, 8N1

Build Command

For toolchain setup and prerequisites, see the Maxim CMake build guide.

Available variants: basic, iio, iio_trigger. Available boards: ad-apard32690-sl. Replace --variant / --board accordingly.

# point at the Maxim SDK libraries (only if not auto-detected)
export MAXIM_LIBRARIES=</path/to/MaximSDK/Libraries>
# Windows (PowerShell): $env:MAXIM_LIBRARIES = "C:\MaximSDK\Libraries"

cd no-OS

# build the project (basic example on the AD-APARD32690-SL board)
python tools/scripts/no_os_build.py build \
        --project ad4692_ardz --variant basic --board ad-apard32690-sl

# build and flash (requires a connected debug probe)
python tools/scripts/no_os_build.py build \
        --project ad4692_ardz --variant basic --board ad-apard32690-sl \
        --probe openocd --flash

AD4692 no-OS Example Project

Contents

Supported Evaluation Boards

Overview