Hi team
My customer has encountered an issue that when they do ESD test, they found there is a flicker issue on the screen which affect the judgment of ESD experiment because this will mislead us to judge whether the flicker is related to ESD or related to the 947-940N working issue. The connection is SoC-947-940N-screen.
Issue description: Customer is using 947 pattern generation to do the ESD test, the screen will switch every two seconds with different pattern option, see the video below. You can see obvious flicker screen at the moment of switching.
1. Test results:
Condition 1. Use 947 test patgen the screen will flicker when switching between blue and color bar;
Condition 2. Use 947 test patgen the screen will flicker when switching between blue and red;
Condition 3. Use SoC video source rather than 947 test patgen, the screen will not flicker when switching the content;
2. Here I collected customer's phenomenon and 947 side configuration, please kindly to check whether the timing has problem;
#!/bin/sh #reset /bin/camera/ccidbgr /dev/cci0 0xc write 0x01 0x03 #mode #/bin/camera/ccidbgr /dev/cci0 0xc write 0x4F 0x00 #/bin/camera/ccidbgr /dev/cci0 0xc write 0x5B 0x22 #1280*720 /bin/camera/ccidbgr /dev/cci0 0xc write 0x66 0x03 /bin/camera/ccidbgr /dev/cci0 0xc write 0x67 0x03 #active 1280*720 /bin/camera/ccidbgr /dev/cci0 0xc write 0x66 0x07 /bin/camera/ccidbgr /dev/cci0 0xc write 0x67 0x00 /bin/camera/ccidbgr /dev/cci0 0xc write 0x66 0x08 /bin/camera/ccidbgr /dev/cci0 0xc write 0x67 0x05 /bin/camera/ccidbgr /dev/cci0 0xc write 0x66 0x09 /bin/camera/ccidbgr /dev/cci0 0xc write 0x67 0x2D #total 1360*750 /bin/camera/ccidbgr /dev/cci0 0xc write 0x66 0x04 /bin/camera/ccidbgr /dev/cci0 0xc write 0x67 0x50 /bin/camera/ccidbgr /dev/cci0 0xc write 0x66 0x05 /bin/camera/ccidbgr /dev/cci0 0xc write 0x67 0xE5 /bin/camera/ccidbgr /dev/cci0 0xc write 0x66 0x06 /bin/camera/ccidbgr /dev/cci0 0xc write 0x67 0x2E #back porch 66/28 /bin/camera/ccidbgr /dev/cci0 0xc write 0x66 0x0C /bin/camera/ccidbgr /dev/cci0 0xc write 0x67 0x42 /bin/camera/ccidbgr /dev/cci0 0xc write 0x66 0x0D /bin/camera/ccidbgr /dev/cci0 0xc write 0x67 0x1C #width 14/2 /bin/camera/ccidbgr /dev/cci0 0xc write 0x66 0x0A /bin/camera/ccidbgr /dev/cci0 0xc write 0x67 0x0E /bin/camera/ccidbgr /dev/cci0 0xc write 0x66 0x0B /bin/camera/ccidbgr /dev/cci0 0xc write 0x67 0x02 #polarities /bin/camera/ccidbgr /dev/cci0 0xc write 0x66 0x0E /bin/camera/ccidbgr /dev/cci0 0xc write 0x67 0x00 /bin/camera/ccidbgr /dev/cci0 0xc write 0x65 0x04 /bin/camera/ccidbgr /dev/cci0 0xc write 0x64 0x15 #enable i2s /bin/camera/ccidbgr /dev/cci0 0xc write 0x12 0x12 sleep 1 export LIBIMG_CFGFILE=/proc/boot/img_splash.conf ssplash -f /proc/boot/logo.jpg -d 0 & /bin/camera/qcarcam_test/qcarcam_test -config=/bin/camera/qcarcam_test/camera_display_in.xml & sleep 2 while [ 1 ] do /bin/camera/ccidbgr /dev/cci0 0xc write 0x64 0x51 sleep 2 /bin/camera/ccidbgr /dev/cci0 0xc write 0x64 0x15 sleep 2 done
3. Could you please analyze it and kindly provide us the 940N pattern generation script so that we could do a compare test that when we use 940N patgen whether the screen will flicker at switching moment, thank you.
