AM3517 HDMI

Keciy,

From the Linux prompt you can refer to the following wiki for information on controlling where the display goes.

http://processors.wiki.ti.com/index.php/UserGuideDisplayDrivers_PSP_03.00.00.05#Switching_output_from_LCD_to_DVI

From uBoot yo ucan add something like the following...

omapfb.mode=dvi:1280x720@60 omapdss.def_disp=dvi

BR,

Steve

Hi,

I have do the command as follows:

 target $ echo 0 > /sys/devices/platform/omapdss/display0/enabled
target $ echo "" > /sys/devices/platform/omapdss/manager0/display
/* Set the Frame buffer parameters like xres, xres_virtual, y_res,
yres_virtualagain before running below command. For example for 720P as
 DVI resolution setxres=1280 yres=720 xres_virtual=1280
yres_virtual=1440.*/
target $ fbset -fb /dev/fb0 -xres $w -yres $h -vxres $w -vyres $h
target $ echo "dvi" > /sys/devices/platform/omapdss/manager0/display
target $ echo 1 > /sys/devices/platform/omapdss/display2/enabled

but when I crosscompile the examples : saMmapLoopback.c  and saMmapDisplay.c  which included in the PSP-SDK demos ,there is still no recation in the computer monitor,I don't know the reason is the board's configuration or the prblem of the examples .Now  I want you can tell me a example which can display video or pictures in the monitor correctly . And if I need to modify the bootargs more.

PS:To display the video signal in the computer monitor I use a conversion line which convert HDMI to VGA.

Thanks.

Is there a reason you have a virtual resolution set different to your display resolution? I would start by setting these the same.

Next, what valuse are you using for $w, $h etc...?

Again, I would start by making these constant values and making them the same as your boot args, i.e. 1280x720 in this case.

BR,

Steve

Hi,steve,

I set the xres=1280,yres=1024,vy\xres=1280,vyres=1024 .the monitor I use is 17"。But there is still no signal display on it.

Moreover,sometimes there are some errors when I set the fb .If I execute  the command:set xres=1280,yres=1024,xres_virtual=1280,yres_virtual=1024; fbset -fb /dev/fb0 -xres $w -yres $h -vxres $w -vyres $h .the result sometimes is:i octl FBIOPUT_VSCREENINFO: Invalid argument  .or sometimes promot the fb set help and sometimes successfull.I don't know the reason.

Idon't konw your expeiment effect and hope you can solve the problem  I missed and send me a test code to me.Because now I　doubt maybe the code I use have problem.

Thank you!

Keciy,

Could you please cut and paste your EXACT sequence of commands since your variable names are being mixed up and a little confusing.

BR,

Steve

Steve,

Now I paste the command and result as follows:

when I　try anthor command .the result is:

I want to know if it is important the LCD's pixel. If it can lead to diaplay nothing when it is set  wrong?

Again,if I want to switch the DVI to LCD ,the following step is OK ?or the board can return to the default set .boot from LCD automatically.

echo 0 >/sys/devices/platform/omapdss/display2/enabled

echo "" > /sys/devices/platform/omapdss/manager0/display

echo "None" > /sys/devices/platform/omapdss/manager0/display

echo 1 >/sys/devices/platform/omapdss/dispaly0/enabled

Additionally,is there some relation about the convert line?

Thanks,

 keciy.

Keciy,

In general, if the command displays the help then there was an error in your arguments.

In the first case I think you have accidentally typed "xyres" instead of vyres.

In the second case you do not need the "=' sign in the variable assignments.

BR,

Steve