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how to modify LCD driver on Wince 6.0

Siyou
Intellectual 560 points
Other Parts Discussed in Thread: AM3517

Hi,

      We have a project need port the wince6.0 to customer's board which base on AM3517, use the BSP version is BSP_WINCE_ARM_A8_01_02_00.  the hardware of the board is modeled the AM3517 EVM which designed by LOGIC, but the LCD of customer board is 10.4inch (color TFT-LCD module: LQ104V1DG59 produced by SHARP), so my problem is how to modify the BSP for the project, especially the LCD driver.

      Does it only two files(lcd_vga.c and lcd_support.c) relate to LCD in the BSP? how to modify the LCD resolution initializtion to suit customer's board, I found there have a function "GetDisplayResolutionFromBootArgs(DWORD * pDispRes)" in /eboot/main.c, but I havn't found where the parameter "g_bootCfg" been set. could you please show me where can configure the LCD resolution in the BSP? Thanks!

  • 0
    TI__Expert 5320 points

    lcd_vga.c and lcd_support.c should be the 2 main files to edit for your custom LCD. The main effort would be adding your LCD params to lcd_res_params structure.These 2 files are used both by the eboot and kernel display driver .

    The g_bootcfg.displayRes is set with default value in OEMPreDownload() in am35x\src\bootloader\eboot\main.c. The user can override this default value at run-time using the eboot menu. The function SetDisplayResolution() in am35x\src\bootloader\eboot\menu.c takes care of that.

    -Madhvi

  • 0 in reply to Madhvi
    Intellectual 560 points

    Hi Madhvi,
      Thank you very much for your help, as you told me I have found the

    g_bootcfg.displayRes initializtion in m35x\src\bootloader\eboot\main.c.

    but it is as below:  g_bootCfg.displayRes = OMAP_LCD_DEFAULT; And the definition of it:
    typedef enum OMAP_LCD_DVI_RES {
        OMAP_LCD_DEFAULT=0,
        OMAP_DVI_640W_480H,
        OMAP_DVI_640W_480H_72HZ,
        OMAP_DVI_800W_480H,
        OMAP_DVI_800W_600H,
        OMAP_DVI_800W_600H_56HZ,
        OMAP_DVI_1024W_768H,
        OMAP_DVI_1280W_720H,
        OMAP_RES_INVALID=8
    }OMAP_LCD_DVI_RES;

    So does it mean that before user override this default value at the

    eboot menu the LCD will doesn't work?

    Thanks!

  • 0 in reply to Siyou
    TI__Expert 5320 points

    I am not sure if I understood your question correctly. The enum OMAP_LCD_DVI_RES corresponds one-to-one to lcd_res_params structure in lcd_vga.c. So if in eboot you plan to select OMAP_LCD_DEFAULT as the displayRes, then make sure index 0 of lcd_res_params in lcd_vga.c has the right parameters for your LCD - in short, overwrite the existing LCD parameters in lcd_res_params with yours. If you plan to add a new index in lcd_res_params structure (i,e, after OMAP_DVI_1280W_720H), then you need to define another enum value in OMAP_LCD_DVI_RES after OMAP_DVI_1280W_720H and use that to set displayRes in eboot.


    -Madhvi

  • 0 in reply to Madhvi
    Intellectual 560 points

         Hi Madhvi,

            Thank you very much for your professional help. I have got it, thanks!