ad400x-st: ad400x-st: Add README

This adds the project documentation.

Signed-off-by: Axel Haslam <ahaslam@baylibre.com>

doc/sphinx/source/projects/ad400x-st.rst

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+.. include:: ../../../../projects/ad400x-st/README.rst

doc/sphinx/source/projects_doc.rst

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    :maxdepth: 1
 
    projects/ad7616-st
+   projects/ad400x-st
 
 POWER MANAGEMENT
 ================

projects/ad400x-st/README.rst

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+Evaluating AD400x on SDP-K1
+===========================
+
+Contents
+--------
+
+.. contents:: Table of Contents
+    :depth: 3
+
+Supported Evaluation Boards
+---------------------------
+
+* `AD400x <https://www.analog.com/en/resources/evaluation-hardware-and-software/evaluation-boards-kits/EVAL-AD400x-FMCZ.html>`_
+
+Overview
+--------
+
+Features and Benefits
+
+Product Details
+The AD4000/AD4001/AD4002/AD4003/AD4020 family of evaluation boards enable quick,
+simplified evaluation of the AD4000 family of 16-/18-/20-bit, precision
+successive approx-imation register (SAR) analog-to-digital converters (ADCs).
+
+The AD4000/AD4001/AD4002/AD4003/AD4020 are low power, 16-bit/18-bit/20-bit,
+precision SAR ADCs that offer high performance with throughputs up to 2 MSPS
+(1.8 MSPS for the AD4020). The evaluation board demonstrates the performance
+of the AD4000/AD4001/AD4002/AD4003/AD4020 family of ADCs and provides a
+simplified interface for a variety of system applications.
+
+Applications
+------------
+
+* Industrial Automation Technology
+* Instrumentation and Measurement Solutions
+* Intelligent Building Solutions
+* Healthcare Solutions
+* Aerospace and Defense Systems
+* Wireless Communication Solutions
+
+Hardware Specifications
+-----------------------
+
+
+No-OS Build Setup
+-----------------
+
+Please see: https://wiki.analog.com/resources/no-os/build
+
+No-OS Supported Examples
+------------------------
+
+IIO example
+^^^^^^^^^^^
+
+This project is actually a IIOD demo for EVAL-AD400X device.
+The project launches a IIOD server on the board so that the user may connect
+to it via an IIO client.
+Using IIO-Oscilloscope, the user can configure the ADC and view the measured data
+on a plot.
+
+If you are not familiar with ADI IIO Application, please take a look at:
+`IIO No-OS <https://wiki.analog.com/resources/tools-software/no-os-software/iio>`_
+
+If you are not familiar with ADI IIO-Oscilloscope Client, please take a look at:
+`IIO Oscilloscope <https://wiki.analog.com/resources/tools-software/linux-software/iio_oscilloscope>`_
+
+The No-OS IIO Application together with the No-OS IIO AD400X driver take care of
+all the back-end logic needed to setup the IIO server.
+
+The read buffer is used for storing the burst data which shall be retrieved
+by any LibIIO client.
+
+No-OS Supported Platforms
+-------------------------
+
+STM32 Platform
+^^^^^^^^^^^^^^
+
+**Used hardware**:
+* Arduinio-FMC interposer
+* `EVAL-AD400x <https://www.analog.com/eval-ad400x-fmcz.html>`_ with
+* `SDP-K1 <https://www.analog.com/en/design-center/evaluation-hardware-and-software/evaluation-boards-kits/sdp-k1.html>`_ and
+* ST debugger
+
+interposer jumper settings:
+SPI_MOSI = 02P
+SPI_MOSO = 01P
+SPI_CLK = 00P
+SPI_CS = 00N
+
+
+**Build Command**
+
+.. code-block:: bash
+
+        # to delete current build
+        make reset
+        # to build the project
+        make
+        # to flash the code
+        make run
+        # to debug the code
+        make debug