EE_BeagleBone_Cape之LCD

chenzhufly

EE_BeagleBone_Cape之LCD [复制链接]

作者：chenzhufly QQ：36886052 ( 转载请注明出处) 1. 概述 这篇文档是关于EE_BeagleBone_Cape LCD，内容不是很多，图形界面的编程不再这里加以讨论和学习，主要说说硬件的配置和测试。 2. LCD硬件设计点滴 我使用的是群创的7寸屏，这里主要注意一下AM3359的LCD控制器数据线和群创RGB的连接关系就可以了。如下所示

1. lcd_data0 B1
   lcd_data1 B2
   lcd_data2 B3
   lcd_data3 B4
   lcd_data4 B5
   lcd_data5 G0
   lcd_data6 G1
   lcd_data7 G2
   lcd_data8 G3
   lcd_data9 G4
   lcd_data10 G5
   lcd_data11 R1
   lcd_data12 R2
   lcd_data13 R3
   lcd_data14 R4
   lcd_data15 R5

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以下两篇文章还是比较有用的： 1) am335x接入LVDS显示器总结 https://bbs.eeworld.com.cn/viewthread.php?tid=329624 2) 给BeagleBone加装1280*800的LCD模块 https://bbs.eeworld.com.cn/thread-332175-1-1.html###zoom 3. LCD相关驱动 3.1 初始化 不管加什么模块，第一件事情都是初始化，需要在beaglebone_dev_cfg中增加初始化函数。

1. /* Beaglebone Rev A3 and after */
   static struct evm_dev_cfg beaglebone_dev_cfg[] = {
   {mii1_init, DEV_ON_BASEBOARD, PROFILE_NONE},
   {usb0_init, DEV_ON_BASEBOARD, PROFILE_NONE},
   {usb1_init, DEV_ON_BASEBOARD, PROFILE_NONE},
   {mmc0_init, DEV_ON_BASEBOARD, PROFILE_NONE},
   {lcdc_init, DEV_ON_BASEBOARD,, PROFILE_NONE},
   {NULL, 0, 0},
   };

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接个我们看看lcdc_init都干了些什么事情， 1. 管脚分配 2. 配置时钟 3. 注册设备

1. static void lcdc_init(int evm_id, int profile)
   {

setup_pin_mux(lcdc_pin_mux);

if (conf_disp_pll(300000000)) {

pr_info("Failed configure display PLL, not attempting to"

"register LCDC\n");

return;

}

if (am33xx_register_lcdc(&TFC_S9700RTWV35TR_01B_pdata))

pr_info("Failed to register LCDC device\n");

return;

}

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1. /* Module pin mux for LCDC */
   static struct pinmux_config lcdc_pin_mux[] = {
   {"lcd_data0.lcd_data0", OMAP_MUX_MODE0 | AM33XX_PIN_OUTPUT
   | AM33XX_PULL_DISA},
   {"lcd_data1.lcd_data1", OMAP_MUX_MODE0 | AM33XX_PIN_OUTPUT
   | AM33XX_PULL_DISA},
   {"lcd_data2.lcd_data2", OMAP_MUX_MODE0 | AM33XX_PIN_OUTPUT
   | AM33XX_PULL_DISA},
   {"lcd_data3.lcd_data3", OMAP_MUX_MODE0 | AM33XX_PIN_OUTPUT
   | AM33XX_PULL_DISA},
   {"lcd_data4.lcd_data4", OMAP_MUX_MODE0 | AM33XX_PIN_OUTPUT
   | AM33XX_PULL_DISA},
   {"lcd_data5.lcd_data5", OMAP_MUX_MODE0 | AM33XX_PIN_OUTPUT
   | AM33XX_PULL_DISA},
   {"lcd_data6.lcd_data6", OMAP_MUX_MODE0 | AM33XX_PIN_OUTPUT
   | AM33XX_PULL_DISA},
   {"lcd_data7.lcd_data7", OMAP_MUX_MODE0 | AM33XX_PIN_OUTPUT
   | AM33XX_PULL_DISA},
   {"lcd_data8.lcd_data8", OMAP_MUX_MODE0 | AM33XX_PIN_OUTPUT
   | AM33XX_PULL_DISA},
   {"lcd_data9.lcd_data9", OMAP_MUX_MODE0 | AM33XX_PIN_OUTPUT
   | AM33XX_PULL_DISA},
   {"lcd_data10.lcd_data10", OMAP_MUX_MODE0 | AM33XX_PIN_OUTPUT
   | AM33XX_PULL_DISA},
   {"lcd_data11.lcd_data11", OMAP_MUX_MODE0 | AM33XX_PIN_OUTPUT
   | AM33XX_PULL_DISA},
   {"lcd_data12.lcd_data12", OMAP_MUX_MODE0 | AM33XX_PIN_OUTPUT
   | AM33XX_PULL_DISA},
   {"lcd_data13.lcd_data13", OMAP_MUX_MODE0 | AM33XX_PIN_OUTPUT
   | AM33XX_PULL_DISA},
   {"lcd_data14.lcd_data14", OMAP_MUX_MODE0 | AM33XX_PIN_OUTPUT
   | AM33XX_PULL_DISA},
   {"lcd_data15.lcd_data15", OMAP_MUX_MODE0 | AM33XX_PIN_OUTPUT
   | AM33XX_PULL_DISA},
   {"gpmc_ad8.lcd_data16", OMAP_MUX_MODE1 | AM33XX_PIN_OUTPUT},
   {"gpmc_ad9.lcd_data17", OMAP_MUX_MODE1 | AM33XX_PIN_OUTPUT},
   {"gpmc_ad10.lcd_data18", OMAP_MUX_MODE1 | AM33XX_PIN_OUTPUT},
   {"gpmc_ad11.lcd_data19", OMAP_MUX_MODE1 | AM33XX_PIN_OUTPUT},
   {"gpmc_ad12.lcd_data20", OMAP_MUX_MODE1 | AM33XX_PIN_OUTPUT},
   {"gpmc_ad13.lcd_data21", OMAP_MUX_MODE1 | AM33XX_PIN_OUTPUT},
   {"gpmc_ad14.lcd_data22", OMAP_MUX_MODE1 | AM33XX_PIN_OUTPUT},
   {"gpmc_ad15.lcd_data23", OMAP_MUX_MODE1 | AM33XX_PIN_OUTPUT},
   {"lcd_vsync.lcd_vsync", OMAP_MUX_MODE0 | AM33XX_PIN_OUTPUT},
   {"lcd_hsync.lcd_hsync", OMAP_MUX_MODE0 | AM33XX_PIN_OUTPUT},
   {"lcd_pclk.lcd_pclk", OMAP_MUX_MODE0 | AM33XX_PIN_OUTPUT},
   {"lcd_ac_bias_en.lcd_ac_bias_en", OMAP_MUX_MODE0 | AM33XX_PIN_OUTPUT},
   {NULL, 0},
   };

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这是关于LCD的一些配置信息

1. static struct lcd_ctrl_config lcd_cfg = {
   &disp_panel,
   .ac_bias = 255,
   .ac_bias_intrpt = 0,
   .dma_burst_sz = 16,
   .bpp = 32,
   .fdd = 0x80,
   .tft_alt_mode = 0,
   .stn_565_mode = 0,
   .mono_8bit_mode = 0,
   .invert_line_clock = 1,
   .invert_frm_clock = 1,
   .sync_edge = 0,
   .sync_ctrl = 1,
   .raster_order = 0,
   };

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1. struct da8xx_lcdc_platform_data TFC_S9700RTWV35TR_01B_pdata = {
   .manu_name = "ThreeFive",
   .controller_data = &lcd_cfg,
   .type = "TFC_S9700RTWV35TR_01B",
   };

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我们还是需要深入的了解一下TFC_S9700RTWV35TR_01B在什么地方定义的，以后我们改其他的屏就在这个地方了drivers/video/Da8xx-fb.c ，正好的我的7寸屏和这个配置比较匹配，就不需要修改了，省事！

1. static struct da8xx_panel known_lcd_panels[] = {
   /* Sharp LCD035Q3DG01 */
   [0] = {
   .name = "Sharp_LCD035Q3DG01",
   .width = 320,
   .height = 240,
   .hfp = 8,
   .hbp = 6,
   .hsw = 0,
   .vfp = 2,
   .vbp = 2,
   .vsw = 0,
   .pxl_clk = 4608000,
   .invert_pxl_clk = 1,
   },
   /* Sharp LK043T1DG01 */
   [1] = {
   .name = "Sharp_LK043T1DG01",
   .width = 480,
   .height = 272,
   .hfp = 2,
   .hbp = 2,
   .hsw = 41,
   .vfp = 3,
   .vbp = 3,
   .vsw = 10,
   .pxl_clk = 7833600,
   .invert_pxl_clk = 0,
   },
   /* ThreeFive S9700RTWV35TR */
   [2] = {
   .name = "TFC_S9700RTWV35TR_01B",
   .width = 800,
   .height = 480,
   .hfp = 39,
   .hbp = 39,
   .hsw = 47,
   .vfp = 13,
   .vbp = 29,
   .vsw = 2,
   .pxl_clk = 30000000,
   .invert_pxl_clk = 0,
   },
   };

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1. struct da8xx_panel {
   const char name[25]; /* Full name _ */
   unsigned short width;
   unsigned short height;
   int hfp; /* Horizontal front porch */
   int hbp; /* Horizontal back porch */
   int hsw; /* Horizontal Sync Pulse Width */
   int vfp; /* Vertical front porch */
   int vbp; /* Vertical back porch */
   int vsw; /* Vertical Sync Pulse Width */
   unsigned int pxl_clk; /* Pixel clock */
   unsigned char invert_pxl_clk; /* Invert Pixel clock */
   };

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4. 相关测试结果

5. PDF下载 EE_BeagleBone_Cape之LCD.pdf (671.19 KB, 下载次数: 295)

2012-10-27 14:05 上传

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wyzamazon

楼主 V5

shower.xu

漂亮，佩服

ou513

酷毙了

fkpwolf

lz的电路板原理图都时开放的么？

chenzhufly

是开放的，呵呵，没找到？

gw1428jk

支持一下，楼主做的不错啊

anananjjj

楼主的文章正需要！感谢分享啊！！！！！

爱JustdoIT

感谢LZ

chen8710

谢谢楼主。楼主V5:rose:

yyfvteuemfw

嗯，正需要呢，谢谢楼主！