TDA2EVM5777: How to set Custom Output Resolution on TDA2X over HDMI ?

Hi Rishabh,

Do you mean,  I have to modify in

Void setDisplayPrm(DisplayLink_CreateParams *pPrm,Chains_DisplayType displayType)

such that

ChainsCommon_SetDisplayPrms(pPrm,NULL,displayType,width,height)

width=1152, height=576

But, displayType will be unknown.

What is the right display type in my case:

 typedef enum {
     CHAINS_DISPLAY_TYPE_LCD_7_INCH = 0,
     /**< Output displayed on 7 inch LCD */
     CHAINS_DISPLAY_TYPE_LCD_10_INCH,
     /**< Output displayed on 10-inch LCD */
     CHAINS_DISPLAY_TYPE_LDC_10_INCH_LCDCTRL_TC358778_MIPI_DSI_1920_1200,
     /**< Output is displayed on 10Inch 1920x1200 LDC */
     CHAINS_DISPLAY_TYPE_HDMI_720P,
     /**< Output displayed on HDMI in 720P resolution */
     CHAINS_DISPLAY_TYPE_HDMI_1080P,
     /**< Output displayed on HDMI in 1080P resolution */
     CHAINS_DISPLAY_TYPE_FPD
     /**< Output displayed via FPD resolution */
 } Chains_DisplayType;

Regards,

Sagar

Hi Rishabh,

It will be great if you tell me filename or structure where i can change DSS width and height.

Reagrds,

Sagar

Hi Rishabh,

I am able to change the Display Link resolution to 1152x576. and here the display output.

Few doubts:

1. I am using a Display which is 1080p (Samsung TV)

- When i have changed the display link resolution to  1152x576. I was asssuming that Display will scale it to fit it properly to output display. But, In the ourput i can see black portion.

2. I also connected same to a normal projector over HDMI

-  Its output is similar to below. But, instead of black portion its white (means image is not at centre. But, starts from left upper corner). 

My final aim is to connect to DLP device which can accept only 1152x576 as input resolution over HDMI.

Can i assume DLP will project it properly? Basically a centred image.

Regards,

Sagar

Hi Rishabh,

Yes. displayType is CHAINS_DISPLAY_TYPE_HDMI_1080P

Following change i have made in the code:

Void ChainsCommon_GetDisplayWidthHeight(
Chains_DisplayType displayType,
UInt32 *displayWidth,
UInt32 *displayHeight)
{
switch(displayType)
{
case CHAINS_DISPLAY_TYPE_LCD_7_INCH:
*displayWidth = 800;
*displayHeight = 480;
break;
case CHAINS_DISPLAY_TYPE_LCD_10_INCH:
*displayWidth = 1280;
*displayHeight = 800;
break;
case CHAINS_DISPLAY_TYPE_LDC_10_INCH_LCDCTRL_TC358778_MIPI_DSI_1920_1200:
*displayWidth = 1920;
*displayHeight = 1200;
break;
case CHAINS_DISPLAY_TYPE_HDMI_720P:
*displayWidth = 1152;
*displayHeight = 576;
break;
case CHAINS_DISPLAY_TYPE_HDMI_1080P:
*displayWidth = 1152;
*displayHeight = 576;
break;
case CHAINS_DISPLAY_TYPE_FPD:
*displayWidth = 1280;
*displayHeight = 720;
break;
default:
OSA_assert(0);
break;
}
}

Actually i thought to create a new displayType of my own. But, I found many changes will be required for the same.

And also i do not know vspolarity, fidpolarity and many more parameters. So, I kept the displayType as CHAINS_DISPLAY_TYPE_HDMI_1080P and changed the width and height.

Regards,

Sagar

Hi Rishabh,

As per your suggestion, i did following changes in my usecase in StartApp function

DisplayLink_SetCfgParams chPrms;

chPrms.isChInfoChangeValid  = 0x01U;
chPrms.chInfo.width         = 1152 ; //input width here
chPrms.chInfo.height        = 576; //input height here
chPrms.chInfo.pitch[0U]     = 1152; //input width here
chPrms.chInfo.pitch[1U]     = chPrms.chInfo.pitch[0U];
chPrms.chInfo.pitch[2U]     = chPrms.chInfo.pitch[0U];
chPrms.chInfo.flags         =
        System_Link_Ch_Info_Set_Flag_Data_Format(chPrms.chInfo.flags,
                                                SYSTEM_DF_RGB24_888);

System_linkControl(pObj->ucObj.Display_VideoLinkID,
                   DISPLAY_LINK_CMD_SET_CFG_PARAMS,
                   &chPrms,
                   sizeof(DisplayLink_SetCfgParams),
                   TRUE);

But, still i am getting the same output. as mentioned in previous reply.

1. Are the changes i have done correct?

2. If display link is configured for 1152x576 and if we connect this to 1080p HDMI Display. How will be the output?

Is it scaled version of 1152x576 to the resolution of HDMI display ? or it will show a centred image? or it will show a image which i have shared earlier?

3. Is there any print or log I can put in display link to check final configuration of display link? 

- What width and height it is configured ? Which location will be right to check a log (please point me a function or file)?

Regards,

Sagar