0458acd998
Co-authored-by: Kevin Schlosser <kdschlosser@users.noreply.github.com> Co-authored-by: Liam <30486941+liamHowatt@users.noreply.github.com>
86 lines
3.3 KiB
ReStructuredText
86 lines
3.3 KiB
ReStructuredText
.. _renesas_glcdc:
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=============
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Renesas GLCDC
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=============
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Overview
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--------
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.. image:: /misc/renesas/glcdc.png
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:alt: Architectural overview of Renesas GLCDC
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:align: center
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<br/>
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GLCDC is a multi-stage graphics output peripheral used in Renesas MCUs.
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It is designed to automatically generate timing and data signals for different LCD panels.
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- Supports LCD panels with RGB interface (up to 24 bits) and sync signals (HSYNC, VSYNC and Data Enable optional)
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- Supports various color formats for input graphics planes (RGB888, ARGB8888, RGB565, ARGB1555, ARGB4444, CLUT8, CLUT4, CLUT1)
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- Supports the Color Look-Up Table (CLUT) usage for input graphics planes (ARGB8888) with 512 words (32 bits/word)
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- Supports various color formats for output (RGB888, RGB666, RGB565, Serial RGB888)
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- Can input two graphics planes on top of the background plane and blend them on the screen
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- Generates a dot clock to the panel. The clock source is selectable from internal or external (LCD_EXTCLK)
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- Supports brightness adjustment, contrast adjustment, and gamma correction
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- Supports GLCDC interrupts to handle frame-buffer switching or underflow detection
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Setting up a project and further integration with Renesas' ecosystem is described in detail on :ref:`page Renesas <renesas>`.
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Check out the following repositories for ready-to-use examples:
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- `EK-RA8D1 <https://github.com/lvgl/lv_port_renesas_ek-ra8d1>`__
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- `EK-RA6M3G <https://github.com/lvgl/lv_port_renesas_ek-ra6m3g>`__
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- `RX72N Envision Kit <https://github.com/lvgl/lv_port_renesas_rx72n-envision-kit>`__
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Prerequisites
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-------------
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- This diver relies on code generated by e² studio. Missing the step while setting up the project will cause a compilation error.
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- Activate the diver by setting :c:macro:`LV_USE_RENESAS_GLCDC` to ``1`` in your *"lv_conf.h"*.
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Usage
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-----
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There is no need to implement any platform-specific functions.
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The following code demonstrates using the diver in :cpp:enumerator:`LV_DISPLAY_RENDER_MODE_DIRECT` mode.
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.. code-block:: c
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lv_display_t * disp = lv_renesas_glcdc_direct_create();
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lv_display_set_default(disp);
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To use the driver in :cpp:enumerator:`LV_DISPLAY_RENDER_MODE_PARTIAL` mode, an extra buffer must be allocated,
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preferably in the fastest available memory region.
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Buffer swapping can be activated by passing a second buffer of same size instead of the :cpp:expr:`NULL` argument.
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.. code-block:: c
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static lv_color_t partial_draw_buf[DISPLAY_HSIZE_INPUT0 * DISPLAY_VSIZE_INPUT0 / 10] BSP_PLACE_IN_SECTION(".sdram") BSP_ALIGN_VARIABLE(1024);
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lv_display_t * disp = lv_renesas_glcdc_partial_create(partial_draw_buf, NULL, sizeof(partial_draw_buf));
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lv_display_set_default(disp);
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.. note::
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Partial mode can be activated via the macro in ``src/board_init.c`` file of the demo projects.
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Screen rotation
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"""""""""""""""
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Software based screen rotation is supported in partial mode. It uses the common API, no extra configuration is required:
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.. code-block:: c
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lv_display_set_rotation(lv_display_get_default(), LV_DISP_ROTATION_90);
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/* OR */
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lv_display_set_rotation(lv_display_get_default(), LV_DISP_ROTATION_180);
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/* OR */
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lv_display_set_rotation(lv_display_get_default(), LV_DISP_ROTATION_270);
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Make sure the heap is large enough, as a buffer with the same size as the partial buffer will be allocated.
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