i.MX ProcessorsのトピックRe: i.MX6 LCD display problem: Projector Shadow display

i.MX6 LCD display problem: Projector Shadow display

guochancen — Tue, 17 Mar 2015 15:18:49 GMT

Hi all,

Now I have made a project of Camera-Projection with i.MX6 quad, it can display now.

However when display the real-time image from the camera, the early image will not clear until ~30 seconds,like following:

1.I put a paper under the camera

2. When I move the paper, the image is still display

My projector parameters are as following:

QVGA

Description Min Type Max Unit

Horizontal total 344 400 488 Pixel

Horizontal active - 320 - Pixel

Horizontal blank - 80 - Pixel

Vertical total 251 300 2000 line

Vertical active - 240 - line

Vertical blank - 60 - line

My linux driver is:

/* 320x240 @ 120 Hz , pixel clk @ 14.4MHz */

const char *name; "My_projector",

u32 refresh; 120,

u32 xres; 320,

u32 yres; 240,

u32 pixclock; 69444,

u32 left_margin; 20,

u32 right_margin; 59,

u32 upper_margin; 20,

u32 lower_margin; 39,

u32 hsync_len; 1,

u32 vsync_len; 1,

u32 sync; 0,

u32 vmode; FB_VMODE_NONINTERLACED,

u32 flag; 0,

What's the problem? What should I do?

Re: i.MX6 LCD display problem: Projector Shadow display

jamesbone — Mon, 30 Mar 2015 18:57:22 GMT

For the settings seems ok your configuration but we need the datasheet for review pixel clock or the front and back porch, I believe this is the problem.

Re: i.MX6 LCD display problem: Projector Shadow display

guochancen — Tue, 31 Mar 2015 02:56:38 GMT

Hi, jamesbone.Thanks for your reply!

But we have signed a confidentiality agreement with the company, so I can only give you part of the datasheet.

This projector only support DE mode, and the datasheet doesn't have the front and back porch, all specification is as following(the picture is cut from the datasheet, not scaled):

QVGA

Description Min Type Max Unit

Horizontal total 344 400 488 Pixel

Horizontal active - 320 - Pixel

Horizontal blank - 80 - Pixel

Vertical total 251 300 2000 line

Vertical active - 240 - line

Vertical blank - 60 - line

Frame Rate - 120 - Hz

Pixel clock - 14.4M - Hz

The parameters from top to bottom are : VSYN, HSYN, (The parameter on original datasheet is not clear too,I can't recognize it),DE, CLK, R[5:0], G[5:0], B[5:0]

Re: i.MX6 LCD display problem: Projector Shadow display

jamesbone — Tue, 07 Apr 2015 20:44:37 GMT

Seems correct your configuration, is the cable of the projector near to any electric source, that may cause EMC or any other interference?