EVAL-CN0391-ARDZ no-OS Example Project

See projects/eval-cn0391-ardz (doxygen) for the Doxygen documentation.

The EVAL-CN0391-ARDZ is a 4-channel Type-K thermocouple temperature measurement board based on the AD7124-8, a low noise, low power, 24-bit sigma-delta ADC. Each channel reads the thermocouple hot junction temperature using cold junction compensation (CJC) provided by a PT1000 RTD driven by a 750 µA current source (IOUT0). The board connects to the host microcontroller via SPI.

This no-OS project targets the EVAL-ADIN1110 board (STM32L4 microcontroller) and exposes the 4 thermocouple channels over a 10BASE-T1L Ethernet link using the ADIN1110 PHY and the lwIP network stack.

See complementary documentation at https://www.analog.com/cn0391.

Hardware Specifications

The EVAL-CN0391-ARDZ connects to the EVAL-ADIN1110 Arduino shield connector. The board is powered through the USB port of the EVAL-ADIN1110.

EVAL-ADIN1110 Connections

EVAL-CN0391-ARDZ	EVAL-ADIN1110
Arduino Shield	Arduino Shield connector
USB (power only)	USB Type-A port

No-OS Build Setup

Please see: https://analogdevicesinc.github.io/no-OS/build_guide.html

No-OS Supported Examples

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

The macros used in Common Data are defined in platform specific files found in: Project Platform Configuration Path

Basic example

This is a simple example which initializes the CN0391 board and reads all 4 thermocouple channels in a continuous loop with a 2-second delay between cycles. The hot junction temperature of each channel is printed over UART.

The channel index (CH0..CH3) corresponds directly to the CHx label silkscreened on the EVAL-CN0391-ARDZ board.

In order to build the basic example, use the following command:

make -j$(nproc) -C projects/eval-cn0391-ardz EXAMPLE=basic_example

IIO over lwIP example

This is the primary example for the EVAL-ADIN1110 platform. It launches an IIO daemon (iiod) over a 10BASE-T1L Ethernet link using the ADIN1110 PHY and the lwIP network stack. No serial output is produced by this example.

The IIO device exposed is an ad7124-8 with 4 channels (voltage0 .. voltage3), each providing:

raw — hot junction temperature in °C (float string)
scale — fixed value 1000 (Zephyr convention for demo compatibility)

The channel index corresponds directly to the CHx label silkscreened on the EVAL-CN0391-ARDZ board.

An optional cn0391 IIO device can be enabled with CN0391_IIO_SUPPORT=y, exposing 4 channels (temp0 .. temp3) with per-channel attributes: hot_junction_temp, cold_junction_temp, tc_voltage, rtd_resistance.

In order to build the IIO over lwIP example, use the following command:

make -j$(nproc) -C projects/eval-cn0391-ardz EXAMPLE=iio_lwip_example ADIN1110_STATIC_IP=y

To override the default static IP address (192.168.90.60):

make -j$(nproc) -C projects/eval-cn0391-ardz EXAMPLE=iio_lwip_example ADIN1110_STATIC_IP=y \
    NO_OS_IP=192.168.1.100 NO_OS_NETMASK=255.255.255.0 NO_OS_GATEWAY=192.168.1.1

To enable the optional cn0391 IIO device:

make -j$(nproc) -C projects/eval-cn0391-ardz EXAMPLE=iio_lwip_example ADIN1110_STATIC_IP=y CN0391_IIO_SUPPORT=y

No-OS Supported Platforms

STM32 Platform

Used hardware:

EVAL-CN0391-ARDZ with
EVAL-ADIN1110

Build Command

# to delete current build
make reset
# to build the IIO over lwIP example (default)
make -j$(nproc) -C projects/eval-cn0391-ardz EXAMPLE=iio_lwip_example ADIN1110_STATIC_IP=y
# to flash the code
make -C projects/eval-cn0391-ardz run