projects: ltc2378: Add README documentation for project

Add README.rst documentation file for project alongside other
documentation related files.

Signed-off-by: Cherrence Sarip <cherrence.sarip@analog.com>

Author: csarip

doc/sphinx/source/projects/adc/ltc2378.rst

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+.. include:: ../../../../../projects/ltc2378/README.rst

projects/ltc2378/README.rst

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+Evaluating the LTC2378-20
+=========================
+
+.. no-os-doxygen::
+
+.. contents::
+	:depth: 3
+
+Supported Evaluation Boards
+---------------------------
+
+`DC2135A <https://www.analog.com/en/resources/evaluation-hardware-and-software/evaluation-boards-kits/dc2135a.html>`_
+
+Overview
+--------
+
+The DC2135A evaluation board features the LTC2378-20, a high-speed 20-bit SAR
+ADC that can be configured for both unipolar (0 to VREF) and bipolar (±VREF)
+input ranges. The board provides all necessary hardware connections and signal
+conditioning for comprehensive ADC evaluation.
+
+The evaluation board provides easy access to all necessary signals through
+standard connectors, enabling quick setup for high-speed data acquisition
+applications up to 1Msps sample rate.
+
+For full performance details, refer to the LTC2378-20 data sheet, which should
+be consulted in conjunction with the user guide.
+
+Hardware Specifications
+-----------------------
+
+Power Supply Requirements
+^^^^^^^^^^^^^^^^^^^^^^^^^
+
+The DC2135A evaluation board requires external ±16V supplies for the analog
+input circuitry and signal conditioning. The LTC2378-20 ADC itself operates
+from a regulated 2.5V supply that is generated on-board.
+
+**Pin Description**
+
+	Please see the following table for the pin assignments:
+
+	+----------+-------------------------------------------+
+	| Name     | Description			       |
+	+----------+-------------------------------------------+
+	| GND      | Connect to Ground			       |
+	+----------+-------------------------------------------+
+	| SCK      | Connect to SPI Clock (SCK)		       |
+	+----------+-------------------------------------------+
+	| SDO      | Connect to SPI Master In Slave Out (MISO) |
+	+----------+-------------------------------------------+
+	| SDI      | Connect to SPI Master Out Slave In (MOSI) |
+	+----------+-------------------------------------------+
+	| CNV      | Connect to GPIO pin (CNV)		       |
+	+----------+-------------------------------------------+
+	| BUSY     | Connect to GPIO pin (BUSY)		       |
+	+----------+-------------------------------------------+
+
+**Hardware Bringup**
+
+For reference, consult the Quick Start Procedure section in the user guide for the corresponding demo board:
+`DC2135A user guide <https://www.analog.com/media/en/technical-documentation/user-guides/DC2135AF.PDF>`_.
+
+No-OS Build Setup
+-----------------
+
+Please see: https://wiki.analog.com/resources/no-os/build
+
+No-OS Supported Examples
+------------------------
+
+The initialization data used in the examples is taken out from:
+`Project Common Data Path <https://github.com/analogdevicesinc/no-OS/tree/main/projects/ltc2378/src/common>`_
+
+The macros used in Common Data are defined in platform specific files found in:
+`Project Platform Configuration Path <https://github.com/analogdevicesinc/no-OS/tree/main/projects/ltc2378/src/platform>`_
+
+Basic example
+^^^^^^^^^^^^^
+
+This is a simple example that initializes the LTC2378-20, perform the start-up
+sequence and configure the output voltage.
+
+To build the basic example, run:
+
+.. code-block:: bash
+
+	make EXAMPLE=basic TARGET=max32665
+
+Or alternatively:
+
+.. code-block:: bash
+
+	export EXAMPLE=basic
+	make TARGET=max32665
+
+IIO example
+^^^^^^^^^^^
+
+This project is actually an IIOD demo for DC2135A evaluation board.
+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 device.
+
+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 LTC2378-20 driver take care of
+all the back-end logic needed to setup the IIO server.
+
+This example initializes the IIO device and calls the IIO app as shown in:
+`IIO Example <https://github.com/analogdevicesinc/no-OS/tree/main/projects/ltc2378/src/examples/iio>`_
+
+To build the IIO example, run:
+
+.. code-block:: bash
+
+	make EXAMPLE=iio TARGET=max32665
+
+Or alternatively:
+
+.. code-block:: bash
+
+	export EXAMPLE=iio
+	make TARGET=max32665
+
+No-OS Supported Platforms
+-------------------------
+
+Maxim Platform
+^^^^^^^^^^^^^^
+
+**Used hardware**
+
+* `DC2135A <https://www.analog.com/en/resources/evaluation-hardware-and-software/evaluation-boards-kits/dc2135a.html>`_
+* `MAX32666FTHR <https://www.analog.com/en/resources/evaluation-hardware-and-software/evaluation-boards-kits/max32666fthr.html>`_
+
+**Connections**:
+
+
++--------------------------+----------------------------------------------+------------------+
+| DC2135A Pin              | Function					  | MAX32666FTHR Pin |
++--------------------------+----------------------------------------------+------------------+
+| SCK                      | SPI Clock (SCK)				  | AIN3 (SPI1_SCK)  |
++--------------------------+----------------------------------------------+------------------+
+| SDO                      | SPI Master In Slave Out (MISO)		  | AIN2 (SPI1_MISO) |
++--------------------------+----------------------------------------------+------------------+
+| SDI                      | SPI Master Out Slave In (MOSI)		  | AIN1 (SPI1_MOSI) |
++--------------------------+----------------------------------------------+------------------+
+| CNV                      | GPIO (CNV Pin)				  | P0_9             |
++--------------------------+----------------------------------------------+------------------+
+| BUSY                     | GPIO (BUSY Pin)				  | P0_10            |
++--------------------------+----------------------------------------------+------------------+
+| GND                      | Ground (GND) 				  | GND              |
++--------------------------+----------------------------------------------+------------------+
+
+**Build Command**
+
+.. code-block:: bash
+
+	# to delete current build
+	make PLATFORM=maxim TARGET=max32665 reset
+	# to build the project and flash the code
+	make PLATFORM=maxim TARGET=max32665 run