BT656 720x576 8bit display error

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BT656 720x576 8bit display error

692 Views
wangfei
Contributor I


 About 720x576 display  have some serrated edges
:
pastedImage_194.png
add L3.0.35_4.1.0_GA_bt656_output_patch_2017-03-10.zip pache.(https://community.nxp.com/servlet/JiveServlet/download/339528-1-418897/L3.0.35_4.1.0_GA_bt656_output...), 1) Support BT656(8 bits) and BT1120 (16 bits)interlaced output on display port.

uboot
env set:console=ttymxc0,115200 init=/init vmalloc=400M androidboot.console=ttymxc0 androidboot.hardware=freescale video_mode=extension video=mxcfb0:dev=bt656,BT656-PAL,if=BT656,fbpix=RGB565 video=mxcfb1:off video=mxcfb2:off fbmem=28M ldo_active=on

In
ipu_disp.c BT656_IF_DI_MSB(23-->15):
  +++ b/drivers/mxc/ipu3/ipu_disp.c
  30
  31  #define BT656_IF_DI_MSB           
15  /* For 8 bits BT656: 23 for DISP_DAT23 ~ DISP_DAT16; 7 for DISP_DAT7 ~ DISP_DAT0 */
  32                                       /* For 16 bits BT1120: 23 for DISP_DAT23 ~ DISP_DAT8; 15 for DISP_DAT15 ~ DISP_DAT0 */

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3 Replies

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qiang_li-mpu_se
NXP Employee
NXP Employee

I think you need check the TV encoder chip setting, the BT656 output signal aligns with BT656 specification, and it is digital signals.

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363 Views
hongchao0680
Contributor III

please past more info ,

pin setting;and your hardware info

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qiang_li-mpu_se
NXP Employee
NXP Employee

You can find the detail informaion from https://community.nxp.com/docs/DOC-94019

We had captured the BT656 frame data on 8 data lines and one clock line, make sure the frame aligns with BT656 specification. 

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