AnsweredAssumed Answered

Eink 10.3" not working with IMXEBOOKDC4

Question asked by Vikrant A P on Aug 28, 2018
Latest reply on Sep 3, 2018 by Wigros Sun


I have the 10.3" Eink Panel which I am trying to interface with the IMXEBOOKDC4 along with the i.MX7 Sabre Board.
The default screen provided on IMXEBOOKDC4 is working fine, but after changing settings I'm not getting any response on the 10.3" Eink.

I have followed the process of updating Panel configuration and timing settings as follows

1. loaded .fw (converted from NXP only) file in /lib/firmware/imx/epdc/

2. modified the panel configuration settings (received from NXP only) and timing in mxc_epdc_v2_fb.c

3. checked all essential files mentioned  in Linux Reference Manual

4. set the environment in boot process for epdc

=> setenv mmcargs 'setenv bootargs console=ttymxc0,115200 root=/dev/mmcblk0p2 rootwait rw epdc video=mxcepdcfb:ED060XC5-1CE,bpp=16'
=> saveenv
Saving Environment to MMC...
Writing to MMC(0)... done
=> boot

5. checked pin connections and Voltages of the power supply


Now the issue is the Vcom voltage is -0.98 V which  should be -1.68 V (as printed on Connector) and no change in Eink Panel, not even refresh (Black -> White)  transition at the end of the booting process, I need help for following questions
1. What could be the possible solution

2. Is there any process to change Vcom setting through the command window or in the environment settings? If yes then how to do that?
3. how to modify fbset settings? current fbset settings which are not getting modified


root@imx7dsabresd:~# fbset


mode "1024x758-0"
    # D: 0.025 MHz, H: 0.022 kHz, V: 0.029 Hz
    geometry 1024 758 1024 1536 16
    timings 40000000 12 76 4 5 12 2
    rgba 5/11,6/5,5/0,0/0


Thanks in advance!