PROCESSOR-SDK-VISION 3.7 : How to change HSYNC polarity on HDMI output

Koichi Saito

Other Parts Discussed in Thread: TDA2

Hi Expert,

I am using Processor SDK Vision 3.7 (PSDKV 3.7) and trying to connect HDMI output to DLP5531 (DLPC230 used) with some modification in PSDKV 3.7.

Resolution changing to 1152x576 was successful, since I conformed that 1152x576 output image was seen on HDMI monitor without any errors.

However, sync error in DLP is now being faced when connecting TDA2 to DLP5531.
As a result of deep investigation, it seems that HSYNC on TDA2 HDMI output needs resersal of polarity.

Please see below analog waveform for HDMI output.

#1: HSYNC original :

#2: HSYNC reversal:

Could you please tell me which source code in PSDKV 3.7 should be modified for HSYNC reversal (#2) ?

Best regard,
Saito

over 6 years ago

0 Rishabh Garg over 6 years ago

TI__Guru 55685 points

Hi Saito-san,

Please refer to file PROCESSOR_SDK_VISION_03_07_00_00\ti_components\drivers\pdk_01_10_03_07\packages\ti\drv\vps\src\vpslib\hal\src\vpshal_dssHdmi.c.

You can update halHdmiWpVideoFormatConfig to hard code the value as an experiment to make sure output works.

Regards,

Rishabh

0 Koichi Saito over 6 years ago in reply to Rishabh Garg

TI__Intellectual 2525 points

Hi Rishabh,

Thank you for prompt reply.

Initilized value is set as below. Is that correct ?

//vpshal_dssHdmi.c

    VpsHal_HdmiInfo     HdmiHalInfo = {{0U,0U,0U,0U,0U,0U,0U,0U,0U,0U,0U,0U},
                                       {0U,0U,0U,0U,VPSHAL_HDMI_PACKETMODERESERVEDVALUE},
                                       {0U,0U,0U,0U,0U,0U,0U,0U,0U,0U,0U,0U,0U,0U,0U,0U,0U},
                                       {0U,0U,0U}};

I will try to chage HSYNC polarity.

Best regards, Saito

0 Rishabh Garg over 6 years ago in reply to Koichi Saito

TI__Guru 55685 points

Hi Saito-san,

I would suggest you to get these values while running the binary and then flip the one you want to modify.

You can build SDK in debug mode and put a break point on halHdmiWpVideoFormatConfig API.

Regards,

Rishabh

0 Rishabh Garg over 6 years ago in reply to Rishabh Garg

TI__Guru 55685 points

Hi Saito-san,

Were you able to get this working?

Regards,

Rishabh

0 Koichi Saito over 6 years ago in reply to Rishabh Garg

TI__Intellectual 2525 points

Hi Rishabh,

Closing this thread. Thanks.

Best regards,

Saito

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PROCESSOR-SDK-VISION 3.7 : How to change HSYNC polarity on HDMI output