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I.MX7Dual - EPDC ED133UT2 - display problem

Question asked by Adam Kaliszewski on Jul 26, 2017
Latest reply on Oct 16, 2017 by arsadhusain momin
Branched to a new discussion

We have a problem with the ED133UT2 EPD display using the iMX7D.

 

1) Screen is connected to the iMX7D
2) From NXP we have received the file epdc_ED133UT2.fw which we uploaded to / lib / firmware / imx / epdc /
3) In the file mxc_epdc_v2_fb.c we have configured our screen


static struct fb_videomode config2_mode = {
.name="ED133UT2",
.refresh=75,
.xres=1600,
.yres=1200,
.pixclock=80000000,
.left_margin=20,
.right_margin=56,
.upper_margin=4,
.lower_margin=7,
.hsync_len=4,
.vsync_len=1,
.sync=0,
.vmode=FB_VMODE_NONINTERLACED,
.flag=0,
};


static struct imx_epdc_fb_mode panel_modes[] = {
{
&config2_mode, /* struct fb_videomode *mode */
4, /* vscan_holdoff */
10, /* sdoed_width */
20, /* sdoed_delay */
10, /* sdoez_width */
20, /* sdoez_delay */
796, /* GDCLK_HP */
481, /* GDSP_OFF */
0, /* GDOE_OFF */
39, /* gdclk_offs */
1, /* num_ce */
}
}
(These parameters we received from nxp)

 

4) Our framebuffer configuration now looks like this.
# fbset

mode "1600x1200-0"
# D: 0.013 MHz, H: 0.007 kHz, V: 0.006 Hz
geometry 1600 1200 1600 2560 16
timings 80000000 20 56 4 7 4 1
rgba 5/11,6/5,5/0,0/0
endmode


Unfortunately, we have "strange" lines on our screen.

What could cause this?

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