AM335X Display

Rajeev

Other Parts Discussed in Thread: DA8XX

Hi All,

we had designed a board based on AM335X core board and got our board booting successfully but as per our requirements we are using 18-bit display with 240X320 resolution

Where can i change the settings for my display to work.

Thnaks in advance,

Rajeev battu

over 12 years ago

0 Rajeev over 11 years ago

Expert 1355 points

Hi All,

I had solved this problem long back but bit late in posting solution,

This should be done in kernel, following is the path,

drivers/video/da8xx-fb.c

In the structure static struct da8xx_panel known_lcd_panels[ ]

Following structure will enable the default display which is shipped with AM335x SH_EVM

       [3] = {
                .name = "NHD-4.3-ATXI#-T-1",
                .width = 480,
                .height = 272,
                .hfp = 8,
                .hbp = 43,
                .hsw = 4,
                .vfp = 4,
                .vbp = 12,
                .vsw = 10,
                .pxl_clk = 9000000,
                .invert_pxl_clk = 0,
        },

You can replace your display properties here or you can create a new structure with customized display parameters

like hsync.vsync, clock, etc.

The same struct name should be called from amm335x_board.c file in stucture NHD_480272MF_ATXI_pdata

struct da8xx_lcdc_platform_data NHD_480272MF_ATXI_pdata = {
        .manu_name              = "NHD",
        .controller_data        = &lcd_cfg,
        .type                   = "ONYX-3.5-16-bit",   // customized    display settings
//      .type                   = "NEC-4.1-24-bit",   //Default EVM display
};

path for board file in kernel is arch/arm/mach-omap2/board-am335xevm.c

Regards,

Rajeev.Battu

0 Thiago Marques over 11 years ago in reply to Rajeev

Prodigy 90 points

I am using a LCD monitor screen KWH050TG08-F01 800x480.
I did the procedures mentioned above, with the correct parameters for my display, but it still doesn't work.
The LCD monitor screen show a left image that takes up less than 50% of the screen appears in the upper corner. I have problem with resolution. < http://goo.gl/UZYIR6 >
The following are my modifications:

linux-3.2.0-psp04.06.00.11/drivers/video/da8xx-fb.c

//"KWH050TG08-F01"
[5] = {
.name = "KWH050TG08-F01",
.width = 800,
.height = 480,
.hfp = 40,
.hbp = 40,
.hsw = 48,
.vfp = 13,
.vbp = 32,
.vsw = 3,

.pxl_clk = 35000000,

.invert_pxl_clk = 0,

________________________________

linux-3.2.0-psp04.06.00.11/arch/arm/mach-omap2/board-am335xevm.c

static struct lcd_ctrl_config wise_lcd_cfg = {
&wise_panel,
.ac_bias = 255,
.ac_bias_intrpt = 0,
.dma_burst_sz = 16,
.bpp = 16,
.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,
};

struct da8xx_lcdc_platform_data wiselcd43_pdata = {
.manu_name = "WiseLCD",
.controller_data = &wise_lcd_cfg,
.type = "KWH050TG08-F01",
};

______________________________________

Could you please share the information with me?

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