Ticket Name: Does TDA2 vout support bt656 8-bit mode?

Query Text:
Other Parts Discussed in Thread: TDA2 Hi all, My code base is VisionSDK_v2.08 and use TDA2 custom board. My vout data pin connect as "TDA2_Vout_D[0~7] -> DS90UB913Q_DIN[2~9]" and data format is "BT656, YUV422, 800x480". In VisionSDK_v2.08, I modify some settings in vision_sdk\examples\tda2xx\src\usecases\common\chains_common.c "ChainsCommon_SetDctrlConfig() " as below "RED". But nothing display on panel. ------------------------------------------------------------------------------------------------------------------------------ if(displayType == CHAINS_DISPLAY_TYPE_LCD_7_INCH) { pPrm->deviceId = DISPLAYCTRL_LINK_USE_LCD; pVInfo->vencId = SYSTEM_DCTRL_DSS_VENC_LCD1; pVInfo->outputPort = SYSTEM_DCTRL_DSS_DPI1_OUTPUT; pVInfo->vencOutputInfo.vsPolarity = SYSTEM_DCTRL_POLARITY_ACT_LOW; pVInfo->vencOutputInfo.hsPolarity = SYSTEM_DCTRL_POLARITY_ACT_LOW; /* Below are of dont care for EVM LCD */ pVInfo->vencOutputInfo.fidPolarity = SYSTEM_DCTRL_POLARITY_ACT_LOW; pVInfo->vencOutputInfo.actVidPolarity = SYSTEM_DCTRL_POLARITY_ACT_LOW; pVInfo->mInfo.standard = SYSTEM_STD_CUSTOM; pVInfo->mInfo.width = displayWidth; pVInfo->mInfo.height = displayHeight; pVInfo->mInfo.scanFormat = SYSTEM_SF_PROGRESSIVE; pVInfo->mInfo.pixelClock = 29232u; pVInfo->mInfo.fps = 60U; pVInfo->mInfo.hFrontPorch = 40u; pVInfo->mInfo.hBackPorch = 40u; pVInfo->mInfo.hSyncLen = 48u; pVInfo->mInfo.vFrontPorch = 13u; pVInfo->mInfo.vBackPorch = 29u; pVInfo->mInfo.vSyncLen = 3u; pVInfo->vencDivisorInfo.divisorLCD = 1; if(Bsp_platformIsTda3xxFamilyBuild()) { pVInfo->vencDivisorInfo.divisorPCD = 1; } else { pVInfo->vencDivisorInfo.divisorPCD = 4; } pVInfo->vencOutputInfo.dataFormat = SYSTEM_DF_YUV422I_YUYV;// SYSTEM_DF_RGB24_888; pVInfo->vencOutputInfo.dvoFormat = SYSTEM_DCTRL_DVOFMT_BT656_EMBSYNC; // SYSTEM_DCTRL_DVOFMT_GENERIC_DISCSYNC; pVInfo->vencOutputInfo.videoIfWidth = SYSTEM_VIFW_8BIT;//SYSTEM_VIFW_24BIT; pVInfo->vencOutputInfo.pixelClkPolarity = SYSTEM_DCTRL_POLARITY_ACT_HIGH; pVInfo->vencOutputInfo.aFmt = SYSTEM_DCTRL_A_OUTPUT_MAX; /* Configure overlay params */ ovlyPrms->vencId = SYSTEM_DCTRL_DSS_VENC_LCD1; } ------------------------------------------------------------------------------------------------------------------------------ I find the description in TDA2 TRM(as below), could TDA2 support 8-bit mode? Or am I missing any settings? Please give me some hints. – Displays supported: • Active matrix color: 12-, 16-, 18-, and 24-bit panel interface support (replicated or dithered encoded pixel values) Thanks in advance.

Responses:
Hi Sherry, I think also pins [9:2] from TDA2 side should be used (instead of [7:0]). See the TRM note below. Regards, Stan

Hi Stan, Thank you for your reply that H/W pin design. In the SW for display setting, I set it as below: pVInfo->vencOutputInfo.dataFormat = SYSTEM_DF_YUV422I_YUYV; pVInfo->vencOutputInfo.dvoFormat = SYSTEM_DCTRL_DVOFMT_BT656_EMBSYNC; pVInfo->vencOutputInfo.videoIfWidth = SYSTEM_VIFW_8BIT; and get error message as below dispdrv/src/vpsdrv_dctrl.c @ Line 713: Core control: Set venc output failed!! Assertion @ Line: 719 in links_ipu/display_ctrl/displayCtrlLink_drv.c: retVal == SYSTEM_LINK_STATUS_SOK : failed !!! I change videoIfWidth = SYSTEM_VIFW_10BIT and get the same error message. But set videoIfWidth = SYSTEM_VIFW_12BIT is OK! How do I set display venc's parameter for BT656? Kuve

Hi Kuve, I don't have much knowledge in DSS software, therefore I cannot tell the exact settings. Regarding "But set videoIfWidth = SYSTEM_VIFW_12BIT is OK!" : there are no sub-12-bit settings available , because it reflects register bits DISPC_CONTROL1[9:8] TFTDATALINES, which in turn configures the data with in RGB mode. That is, it is irrelevant to BT656 and therefore you can leave it at default (12-bit). Because most of the other settings above are related to DSS registers, you can refer to Table 11-150. DISPC Configure BT.656 or BT.1120 Mode, and other tables in the same section of TRM. Regards, Stan