docs(renesas): add a general introduction page (#5969)

docs/integration/chip/renesas.rst

@@ -0,0 +1,82 @@
+=======
+Renesas
+=======
+
+[Renesas](https://renesas.com/) is an official partner of LVGL.
+Therefore, LVGL contains built-in support for [Dave2D](https://lpccs-docs.renesas.com/DA1470x/UM-B-157_DA1470x-GPU-API-Manual/files/doc/overview-txt.html) (the GPU of Renesas)
+and LVGL also hosts ready-to-use Renesas projects.
+
+Dave2D
+------
+
+Dave2D is capable of accelerating most of the drawing operations of LVGL:
+
+- Rectangle drawing, even with gradients
+- Image drawing, scaling, and rotation
+- Letter drawing
+- Triangle drawing
+- Line drawing
+
+As Dave2D works in the background, the CPU is free for other tasks. In practice, during rendering, Dave2D can reduce the CPU usage by half or to one-third, depending on the application.
+
+Certified boards
+----------------
+
+LVGL has [certified](https://lvgl.io/certificate) one Renesas board so far (more will come soon).
+
+.. raw:: html
+
+  <iframe width="560" height="315" src="https://www.youtube.com/embed/LHPIqBV_MGA?si=mtW3g-av56bCdR4k" title="YouTube video player" frameborder="0" allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share" referrerpolicy="strict-origin-when-cross-origin" allowfullscreen></iframe>
+
+Get started with the Renesas ecosystem
+--------------------------------------
+
+The official IDE of Renesas is called [e² studio](https://www.renesas.com/us/en/software-tool/e-studio?gad_source=1&gclid=CjwKCAjw5ImwBhBtEiwAFHDZx2V3lumaenbyJnc5Ctrclr_lEQM3G22iZgB-4F92OVLCI7xmzp1YQRoCcRgQAvD_BwE). As it's Eclipse-based, it runs on Windows, Linux, and Mac as well.
+
+To get started, just download and install e² studio.
+
+Getting started with LVGL
+-------------------------
+
+LVGL provides a ready-to-use project for the [EK-RA8D1](https://www.renesas.com/us/en/products/microcontrollers-microprocessors/ra-cortex-m-mcus/ek-ra8d1-evaluation-kit-ra8d1-mcu-group) development board. Its main features from the HMI's point of view are:
+
+- 480MHz, Arm Cortex®-M85 core
+- 2MB Code Flash, 1MB SRAM
+- MIPI DSI & Parallel Graphics Expansion Ports
+- 4.5 Inch backlit TFT display, 16.7M display colors
+- 480x854 pixels resolution
+
+To get a ready-to-use project, clone the [lv_renesas](https://github.com/lvgl/lv_renesas.git) repository:
+
+..code:: shell
+  git clone https://github.com/lvgl/lv_renesas.git --recurse-submodules
+
+After that, *Import* ``lv_ek_ra8d1`` into e² studio, build the project, and flash it.
+
+Note that on the ``SW1`` DIP switch (middle of the board) 7 should be ON, all others are OFF.
+
+Modify the project
+------------------
+
+Open a demo
+~~~~~~~~~~~
+
+In `LVGL_thread_entry <https://github.com/lvgl/lv_renesas/blob/master/lv_ek_ra8d1/src/LVGL_thread_entry.c>`__, the demos are automatically enabled based on the settings in `lv_conf.h <https://github.com/lvgl/lv_renesas/blob/master/lv_ek_ra8d1/src/lv_conf.h>`__.
+
+You can disable all demos (or just comment them out) and call some ``lv_example_...()`` functions, or add your custom code.
+
+Configuration
+~~~~~~~~~~~~~
+
+lv_conf.h contains the most important settings for LVGL. Namely:
+
+LV_COLOR_DEPTH to set LVGL's default color depth
+LV_MEM_SIZE to set the maximum RAM available for LVGL
+LV_USE_DAVE2D to enable the GPU
+configuration.xml contains the settings for the board and the MCU. By opening this file, all the hardware and software components can be customized in a visual way.
+
+
+Support
+-------
+
+In case of an problems or questions open an issue in the `lv_renesas <https://github.com/lvgl/lv_renesas/issues>`__ repository.