iMX8M Mini Windows 10 IoT with ili9811c LCD panel display debugging assistance

jesselin0420 · ‎07-19-2023

Hi Experts,

Currently, we have successfully integrated the i.MX8M Mini processor with the BSP downloaded from the NXP website (W21H2-1-4-0), following the guidelines specified in the "i.MX Windows 10 IoT User’s Guide" to incorporate our custom board. The good news is that we can boot to UEFI without any problems.

However, upon entering Windows IoT, we encounter a black screen. Allow me to provide more details on our configuration:

*Customized board with ili9881c MIPI DSI panel.
*We have added the necessary driver and configured the ili9881c settings in u-boot, which resulted in a visible splash screen.

To address this issue, we are seeking your valuable guidance on debugging steps. Specifically, we would appreciate your expertise in helping us identify the root cause of the black screen issue in Windows IoT.

To assist you better, we have attached the log file, which contains relevant information that may aid in the debugging process.

Thank you for your time and consideration. We look forward to hearing from you soon.

Best regards,

Jesse

Michal_Minarcik · ‎07-27-2023

Hi @jesselin0420,

Can you please provide the resolution and parameters of the LCD panel you are connecting?

Thank you,

Best regards,

Michal

jesselin0420 · ‎07-27-2023

@Michal_Minarcik

below parameters are defined in the panel driver. You can find them in the patch I provided.

#define   LCD_XSIZE_TFT   720
#define   LCD_YSIZE_TFT   1280
#define   PCLOCK          62000
#define   LCD_VBPD        20
#define   LCD_VFPD        10
#define   LCD_VSPW        10
#define   LCD_HBPD        30
#define   LCD_HFPD        10
#define   LCD_HSPW        20

Michal_Minarcik · ‎07-31-2023

Hi @jesselin0420,

for i.MX 8M Mini it also needs to be modified in UEFI.

Open file mu_platform_nxp\Silicon\ARM\NXP\iMX8Pkg\Library\iMX8LcdHwLib\iMX8LcdHwLib.c

Add definiton for your display. According to the parameters provided, it should be as follows:

/* 720x1280@60Hz */
const IMX_DISPLAY_TIMING PreferredTiming_720x1280_60 = {
.PixelClock = 62000000,
.HActive = 720,
.HBlank = 60,
.VActive = 1280,
.VBlank = 40,
.HSync = 20,
.VSync = 10,
.HSyncOffset = 10,
.VSyncOffset = 10,
.HImageSize = 0,
.VImageSize = 0,
.HBorder = 0,
.VBorder = 0,
.EdidFlags = 0,
.Flags = 0,
.PixelRepetition = 0,
.Bpp = 24,
.PixelFormat = PIXEL_FORMAT_ARGB32,
};

In the function below, select the desired resolution from the definition added above.

EFI_STATUS
LcdDisplayDetect (
VOID
)

/* Search for ADV7535 */
status = Adv7535Discover();
if (status == EFI_SUCCESS) {
DEBUG((DEBUG_ERROR, "ADV7535 probe SUCCEDED. Mipi-dsi display interface selected.\n"));
converter = ADV7535;
displayInterface = imxMipiDsi;
LcdInitPreferredTiming (&PreferredTiming_720x1280_60, &PreferredTiming);
break;

In the same file, the function below is called to initialize the NXP test panel. I assume you don't need any initialization, so it will need to be commented out.

Function:
LcdSetMode (
IN UINT32 ModeNumber
)

Comment:
CHECK_STATUS_RETURN_ERR(Rm67191Init(), "RM67191 config");

Best regards,

Michal