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Renesas GLCDC

Overview(概述)

Architectural overview of Renesas GLCDC

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GLCDC is a multi-stage graphics output peripheral used in Renesas MCUs. It is designed to automatically generate timing and data signals for different LCD panels.

  • Supports LCD panels with RGB interface (up to 24 bits) and sync signals (HSYNC, VSYNC and Data Enable optional)

  • Supports various color formats for input graphics planes (RGB888, ARGB8888, RGB565, ARGB1555, ARGB4444, CLUT8, CLUT4, CLUT1)

  • Supports the Color Look-Up Table (CLUT) usage for input graphics planes (ARGB8888) with 512 words (32 bits/word)

  • Supports various color formats for output (RGB888, RGB666, RGB565, Serial RGB888)

  • Can input two graphics planes on top of the background plane and blend them on the screen

  • Generates a dot clock to the panel. The clock source is selectable from internal or external (LCD_EXTCLK)

  • Supports brightness adjustment, contrast adjustment, and gamma correction

  • Supports GLCDC interrupts to handle frame-buffer switching or underflow detection

Setting up a project and further integration with Renesas' ecosystem is described in detail on page Renesas.
Check out the following repositories for ready-to-use examples:

GLCDC 是在瑞萨微控制器中使用的多级图形输出外设。 它被设计为自动为不同的 LCD 面板生成时序和数据信号。

  • 支持带有 RGB 接口(高达 24 位)和同步信号(HSYNC、VSYNC 和数据使能可选)的 LCD 面板

  • 支持输入图形平面的各种颜色格式(RGB888、ARGB8888、RGB565、ARGB1555、ARGB4444、CLUT8、CLUT4、CLUT1)

  • 支持输入图形平面(ARGB8888)使用颜色查找表(CLUT)具有 512 个条目(32 位/条目)

  • 支持输出的多种颜色格式(RGB888、RGB666、RGB565、串行 RGB888)

  • 可以在背景平面之上输入两个图形平面并在屏幕上混合它们

  • 向面板生成点时钟。时钟源可以选择内部或外部(LCD_EXTCLK)

  • 支持亮度调整、对比度调整和伽马校正

  • 支持 GLCDC 中断以处理帧缓冲区切换或下溢检测

关于设置项目以及与瑞萨生态系统进一步集成的详细描述,请参考 瑞萨 页面
请查看以下代码库以获取现成的示例:

Prerequisites(先决条件)

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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.

  • Activate the diver by setting LV_USE_RENESAS_GLCDC to 1 in your "lv_conf.h".


  • 这个驱动依赖于 e² studio 生成的代码。在设置项目时跳过这一步会导致编译错误。

  • 通过在您的 "lv_conf.h" 文件中设置 LV_USE_RENESAS_GLCDC 宏为 1 来激活驱动。

Usage(用法)

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There is no need to implement any platform-specific functions.

The following code demonstrates using the diver in LV_DISPLAY_RENDER_MODE_DIRECT mode.

lv_display_t * disp = lv_renesas_glcdc_direct_create();
lv_display_set_default(disp);

To use the driver in LV_DISPLAY_RENDER_MODE_PARTIAL mode, an extra buffer must be allocated, desireably in the fastest available memory region. Buffer swapping can be activated by passing a second buffer of same size insted of the NULL argument.

static lv_color_t partial_draw_buf[DISPLAY_HSIZE_INPUT0 * DISPLAY_VSIZE_INPUT0 / 10] BSP_PLACE_IN_SECTION(".sdram") BSP_ALIGN_VARIABLE(1024);

lv_display_t * disp = lv_renesas_glcdc_partial_create(partial_draw_buf, NULL, sizeof(partial_draw_buf));
lv_display_set_default(disp);

无需实现任何特定平台的函数。

以下代码演示了在 LV_DISPLAY_RENDER_MODE_DIRECT 模式下使用驱动。

lv_display_t * disp = lv_renesas_glcdc_direct_create();
lv_display_set_default(disp);

要在 LV_DISPLAY_RENDER_MODE_PARTIAL 模式下使用驱动,必须分配一个额外的缓冲区,最好在最快的可用内存区域中。 通过传递第二个相同大小的缓冲区而不是 NULL 参数,可以激活缓冲区交换。