i.MX6 IPU RGB interface refresh issue

kaangencay — Thu, 22 Mar 2018 07:25:27 GMT

Hello,

I use i.MX6 Solo and 7" TFT LCD (480*800) via RGB888 interface.

I developed IPU driver based on SDK,, and finally it works.

Now, here is my problem, when I change the data in my software buffer, the LCD display screen refreshing is not working properly. When I call the code below, the display screen is like attached image. It updates some of pixels over time. But when I call the code consecutive below , (at least 5-6 times) dipslay is filled with the color. But this time, I can see color/pixel transition.

Do you have any idea for the dipslay to work properly and faster?

case BLUE_COLOR:

for( i=0; i< (IPU_DISP_BUFFER_SIZE * FRAME_BPP ); i++ )
{
if( i%3 == 0 )display_buff[i] = 0x00;
if( i%3 == 1 )display_buff[i] = 0x00;
if( i%3 == 2 )display_buff[i] = 0xFF;
}

break;

Re: i.MX6 IPU RGB interface refresh issue

igorpadykov — Thu, 22 Mar 2018 09:31:36 GMT

Hi KAAN

one can try to use double buffering to prevent tearing effects,

sect.37.4.2.7 i.MX6DQ Reference Manual shows address

calculation according to parameters stored in the CPMEM.
http://www.nxp.com/docs/en/reference-manual/IMX6DQRM.pdf

Best regards
igor
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i.MX6 IPU RGB interface refresh issue

Re: i.MX6 IPU RGB interface refresh issue