Not Working 18bit 2.8'' LCD on AM5728 ?

PRRADDHEP REDDE

Intellectual 790 points

Other Parts Discussed in Thread: AM5728

Hi,

we used 18bit ILI9341 LCD with AM5728?

This LCD chip is initialized with SPI interface and data is transferred with parallel RGB interface.

The SPI initialization has done in drivers/video/fbdev/omap2/displays-new/panel-dpi.c and converted to RGB interface.

but display is not getting.Only one small blue line is displayed.we used omapdrm in kernel.

I have attached the LCD images please check it.

In the below image left side one small blue line is appearing.I am not getting full screen.

Thanks,

PRRADDHEP REDDE

over 10 years ago

0 Biser Gatchev-XID over 10 years ago

TI__Guru**** 393215 points

Please post your display settings in the device tree.

0 PRRADDHEP REDDE over 10 years ago in reply to Biser Gatchev-XID

Intellectual 790 points

Hi Biser,

My dts file config

&mcspi4 {
pinctrl-names = "default";
pinctrl-0 = <&mcspi4_pins>;
status = "okay";

lcd0: display{
compatible = "omapdss,lgphilips,lb035q02";
reg = <0>;
spi-max-frequency = <100000>;
spi-cpol;
spi-cpha;

label = "lcd";

enable-gpios = <&gpio4 9 0>;

port {
lcd_in: endpoint {
remote-endpoint = <&dpi_out>;
};
};
};

}

And the resolution and frequency as mentioned in the dpi panel driver

static struct omap_video_timings lb035q02_timings = {
.x_res = 240,
.y_res = 320,

.pixelclock = 6350000,

.hsw = 10,
.hfp = 10,
.hbp = 20,

.vsw = 2,
.vfp = 4,
.vbp = 2,

.vsync_level = OMAPDSS_SIG_ACTIVE_LOW,
.hsync_level = OMAPDSS_SIG_ACTIVE_LOW,
.data_pclk_edge = OMAPDSS_DRIVE_SIG_RISING_EDGE,
.de_level = OMAPDSS_SIG_ACTIVE_HIGH,
.sync_pclk_edge = OMAPDSS_DRIVE_SIG_FALLING_EDGE,
};

Thanks
PRRADDHEP REDDE

0 Biser Gatchev-XID over 10 years ago in reply to PRRADDHEP REDDE

TI__Guru**** 393215 points

Thanks. The software team will look at this and respond directly here.

0 PRRADDHEP REDDE over 10 years ago in reply to Biser Gatchev-XID

Intellectual 790 points

Thanks Biser.

0 Yordan Kovachev over 10 years ago in reply to PRRADDHEP REDDE

TI__Guru**** 161600 points

Hi,

The dts settings look correct. I am not familiar in details with the ili displays, but this might be an erroneous initialization. Can take reference from the following generic tft driver source:
github.com/.../flexfb.c
During my research on this I've found some feedback that the driver works with ili displays. It is using FB, but it could be used as a reference, i.e. for the display init sequence.

Hope this helps.

Best Regards,
Yordan

0 PRRADDHEP REDDE over 10 years ago in reply to Yordan Kovachev

Intellectual 790 points

Hi Yordan,

Thanks for your reply.

The initialization code is same as the in the above link what you have send.

But in that they are using SPI interface for data and contro i think.

But I need controlling through SPI interface and data through parallel interface.

Can you suggest any thing.

Thanks,

PRRADDHEP REDDE

0 Yordan Kovachev over 10 years ago in reply to PRRADDHEP REDDE

TI__Guru**** 161600 points

Hi,

Yes, you're correct that they are using SPI interface for data and control.

But I need controlling through SPI interface and data through parallel interface.

Can you suggest any thing.

I am sorry, but I am not aware of an example driver, which you can reference... this is a quite customized use case.

Best Regards,
Yordan

Processors

Processors forum

Not Working 18bit 2.8'' LCD on AM5728 ?