topic Re: Dual display LCD and HDMI in i.MX Processors

Dual display LCD and HDMI

vongocson — Tue, 28 Mar 2017 00:23:24 GMT

hi everyone

i'm using Linux Yocto 4.1.15 with imx6q sabresd sample board.

start kit after that i want to show camera to dual display to LCD and HDMI same time.

how to way setting, can you tell me?

device tree mxcfb(0-4) -> 'disable' to 'okay'
u-boot : setenv video 'video=mxcfb0:dev=hdmi,1920x1080M@60,if=RGB24 video=mxcfb0:dev=ldb,LCD-VGA,if=RGB666 ldb=spl0'
gstreamer 1.0 : gst-launch-1.0 imxv4l2videosrc ! imxipuvideosink -> show camera

but it only show to HDMI.

best regard

son

Re: Dual display LCD and HDMI

joanxie — Wed, 05 Apr 2017 08:45:08 GMT

refer to your uboot command, you use the same mxcfb0 to the dual display, try to use mxcfb1 for lvds.

Re: Dual display LCD and HDMI

vongocson — Wed, 12 Apr 2017 04:17:14 GMT

i have been change it

setenv video 'video=mxcfb0:dev=hdmi,1920x1080M@60,if=RGB24 video=mxcfb1:dev=ldb,LCD-VGA,if=RGB666 '

but it's not working.

Re: Dual display LCD and HDMI

aravinthkumarja — Wed, 12 Apr 2017 05:38:17 GMT

In dtsi also you have mention fb0 for HDMI and fb1 for ldb.

Regards,

Aravinth

Re: Dual display LCD and HDMI

joanxie — Wed, 12 Apr 2017 06:18:58 GMT

pls try this command:
"echo 0 > /sys/class/graphics/fb1/blank"
could you see the penguin on the lcd too? if no, pls try the command as below:
"echo 0 > /sys/class/graphics/fb2/blank

dd if=/dev/urandom of=/dev/fb2"

Re: Dual display LCD and HDMI

marius_grigoras — Wed, 12 Apr 2017 14:36:32 GMT

Add you called/added this new parameter in mmcargs adding ${video} at the final?

Thank you,

Marius

Re: Dual display LCD and HDMI

vongocson — Thu, 13 Apr 2017 01:28:22 GMT

i tried it, but after that my screen (lcd) turns black.

so that i try the command

"echo 0 > /sys/class/graphics/fb2/blank

dd if=/dev/urandom of=/dev/fb2"

->result:

dd: writing to '/dev/fb2': No space left on device
1201+0 records in
1200+0 records out
614400 bytes (614 kB) copied, 0.306399 s, 2.0 MB/s

best regard!

Re: Dual display LCD and HDMI

vongocson — Thu, 13 Apr 2017 01:30:59 GMT

i did it with the command

baudrate=115200
boot_fdt=try
bootcmd=mmc dev ${mmcdev};if mmc rescan; then if run loadbootscript; then run bootscript; else if run loadimage; then run mmcboot; else run netboot; fi; fi; else run netboot; fi
bootcmd_mfg=run mfgtool_args;bootz ${loadaddr} ${initrd_addr} ${fdt_addr};
bootdelay=1
bootscript=echo Running bootscript from mmc ...; source
console=ttymxc0
emmcdev=2
epdc_waveform=epdc_splash.bin
ethact=FEC
ethprime=FEC
fdt_addr=0x18000000
fdt_file=imx6q-hinoeng.dtb
fdt_high=0xffffffff
image=zImage
initrd_addr=0x12C00000
initrd_high=0xffffffff
ip_dyn=yes
loadaddr=0x12000000
loadbootscript=fatload mmc ${mmcdev}:${mmcpart} ${loadaddr} ${script};
loadfdt=fatload mmc ${mmcdev}:${mmcpart} ${fdt_addr} ${fdt_file}
loadimage=fatload mmc ${mmcdev}:${mmcpart} ${loadaddr} ${image}
mfgtool_args=setenv bootargs console=ttymxc0,115200 rdinit=/linuxrc g_mass_storage.stall=0 g_mass_storage.removable=1 g_mass_storage.file=/fat g_mass_storage.ro=1 g_mass_storage.idVendor=0x066F g_mass_storage.idProduct=0x37FF g_mass_storage.iSerialNumber="" enable_wait_mode=off
mmcargs=setenv bootargs console=${console},${baudrate} ${smp} root=${mmcroot} ${video}
mmcautodetect=yes
mmcboot=echo Booting from mmc ...; run mmcargs; if test ${boot_fdt} = yes || test ${boot_fdt} = try; then if run loadfdt; then bootz ${loadaddr} - ${fdt_addr}; else if test ${boot_fdt} = try; then bootz; else echo WARN: Cannot load the DT; fi; fi; else bootz; fi;
mmcdev=0
mmcpart=1
mmcroot=/dev/mmcblk1p2 rootwait rw
netargs=setenv bootargs console=${console},${baudrate} ${smp} root=/dev/nfs ip=dhcp nfsroot=${serverip}:${nfsroot},v3,tcp
netboot=echo Booting from net ...; run netargs; if test ${ip_dyn} = yes; then setenv get_cmd dhcp; else setenv get_cmd tftp; fi; ${get_cmd} ${image}; if test ${boot_fdt} = yes || test ${boot_fdt} = try; then if ${get_cmd} ${fdt_addr} ${fdt_file}; then bootz ${loadaddr} - ${fdt_addr}; else if test ${boot_fdt} = try; then bootz; else echo WARN: Cannot load the DT; fi; fi; else bootz; fi;
script=boot.scr
update_emmc_firmware=if test ${ip_dyn} = yes; then setenv get_cmd dhcp; else setenv get_cmd tftp; fi; if ${get_cmd} ${update_sd_firmware_filename}; then if mmc dev ${emmcdev} 1; then setexpr fw_sz ${filesize} / 0x200; setexpr fw_sz ${fw_sz} + 1; mmc write ${loadaddr} 0x2 ${fw_sz}; fi; fi
update_sd_firmware=if test ${ip_dyn} = yes; then setenv get_cmd dhcp; else setenv get_cmd tftp; fi; if mmc dev ${mmcdev}; then if ${get_cmd} ${update_sd_firmware_filename}; then setexpr fw_sz ${filesize} / 0x200; setexpr fw_sz ${fw_sz} + 1; mmc write ${loadaddr} 0x2 ${fw_sz}; fi; fi
video=video=mxcfb0:dev=hdmi,1920x1080M@60,if=RGB24 video=mxcfb1:dev=ldb,LCD-VGA,if=RGB666

Environment size: 2751/8188 bytes

Re: Dual display LCD and HDMI

joanxie — Thu, 13 Apr 2017 06:31:33 GMT

when you use the command "echo 0 > /sys/class/graphics/fb1/blank" , you can see the penguin on lcd right? then did you try to play the video to dual display by gstreamer? still hdmi has video, lcd doesn't?

Re: Dual display LCD and HDMI

vongocson — Thu, 13 Apr 2017 07:39:18 GMT

thanks for reply

yes, i 'm using gstreamer:

gst-launch-1.0 imxv4l2videosrc ! imxipuvideosink

but only hdmi is run, lcd is doesn't

Re: Dual display LCD and HDMI

joanxie — Thu, 13 Apr 2017 08:05:32 GMT

you should add device you want to display, like "video-sink="imxv4l2sink device=/dev/video17" in the end of gstreamer command, video 16 is for fb0 ,video 17 is for fb1.

Re: Dual display LCD and HDMI

vongocson — Thu, 13 Apr 2017 08:35:42 GMT

sory, it's not work!

can you tell me how to do that?

best reagard

son

Re: Dual display LCD and HDMI

yyuan — Wed, 10 Apr 2019 12:29:32 GMT

i have the same problem.

please have you solved the problem?

how did you solve it?

thank you very much!