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by leelabks
Sun Mar 17, 2019 11:36 am
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: Usage of hdmi_group=0 in config.txt
Replies: 5
Views: 167

Re: Usage of hdmi_group=0 in config.txt

If i use the following custom timing then the display is ok

hdmi_group=2
hdmi_mode=87
hdmi_timings=720 0 80 10 150 1280 0 20 10 20 0 0 0 60 0 76000000 3

I just trying to see if there is any possibilities to let the Raspberry Pi to auto-detect the display timing setting like the Windows 7 system.
by leelabks
Sun Mar 17, 2019 11:29 am
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: Usage of hdmi_group=0 in config.txt
Replies: 5
Views: 167

Re: Usage of hdmi_group=0 in config.txt

yes, i am trying to gather different opinion from different perspective, for the discussion, please refer to: https://github.com/raspberrypi/firmware/issues/1121
Apology if i have made the trouble for anyone ...
by leelabks
Thu Mar 14, 2019 5:17 am
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: Usage of hdmi_group=0 in config.txt
Replies: 5
Views: 167

Usage of hdmi_group=0 in config.txt

I have a display module with custom display timing (not the standard DMT or CEA) and i would like to use the "hdmi_group=0" in the "config.txt" to let the Raspberry Pi to do the "Auto-detect from EDID" which the EDID information is resided in the display module. However, it seems like the "hdmi_grou...
by leelabks
Tue Feb 12, 2019 3:48 am
Forum: Official Foundation Display
Topic: The Official Raspberry Pi 7" Touchscreen Display Cannot work with Raspberry Pi 2 Model B
Replies: 3
Views: 592

Re: The Official Raspberry Pi 7" Touchscreen Display Cannot work with Raspberry Pi 2 Model B

The flex cable connection from the Raspberry Pi 2 Model B to the Display Adapter board are connected wrongly, after fixing the connection, the display is working now! thanks for the suggestion! I found another website which provide some clear connection photos which may useful for other as well: htt...
by leelabks
Mon Feb 11, 2019 3:25 am
Forum: Official Foundation Display
Topic: The Official Raspberry Pi 7" Touchscreen Display Cannot work with Raspberry Pi 2 Model B
Replies: 3
Views: 592

Re: The Official Raspberry Pi 7" Touchscreen Display Cannot work with Raspberry Pi 2 Model B

I found an unofficial reversed engineered adapter board schematic, https://imgur.com/a/24TFn. According to the schematic, the LCD backlight driver U1 pin-4 (SHDN) is 0V, anyone has any idea what is controlling this LCD backlight shutdown pin function? Where can i get the official display pin arrange...
by leelabks
Sun Feb 10, 2019 12:19 pm
Forum: Official Foundation Display
Topic: The Official Raspberry Pi 7" Touchscreen Display Cannot work with Raspberry Pi 2 Model B
Replies: 3
Views: 592

The Official Raspberry Pi 7" Touchscreen Display Cannot work with Raspberry Pi 2 Model B

I use the Raspberry Pi 7” Touchscreen Display, https://www.element14.com/community/docs/DOC-78156/l/raspberry-pi-7-touchscreen-display#installI, to connect to the Raspberry Pi 2 Model B. The hardware connection I followed the website, https://www.element14.com/community/docs/DOC-78156/l/raspberry-pi...
by leelabks
Sat Sep 02, 2017 11:44 am
Forum: Compute Module
Topic: Issue in Flashing CM3 eMMC
Replies: 8
Views: 2542

Re: Issue in Flashing CM3 eMMC

update:
if transfer failed, (no need to close the running executable, just leave it there) then need to unplug the usb cable and then plug in the usb cable again (without unplug the power supply cable). according to the test, this can help to solve the problem.
by leelabks
Wed Aug 30, 2017 11:02 am
Forum: Compute Module
Topic: Issue in Flashing CM3 eMMC
Replies: 8
Views: 2542

Re: Issue in Flashing CM3 eMMC

no more issue when run the rpiboot as "Run as Administrator". reference: http://www.embeddedpi.com/documentation/installing-linux-os/mypi-industrial-raspberry-pi-flashing-the-compute-module. Everytime power cycle the board, the USB cable communication cable to the computer need to plug and unplug as...
by leelabks
Wed Aug 30, 2017 7:35 am
Forum: Compute Module
Topic: Issue in Flashing CM3 eMMC
Replies: 8
Views: 2542

Issue in Flashing CM3 eMMC

I am using Windows 7 for the development and I am follow the instruction (https://www.raspberrypi.org/documentation/hardware/computemodule/cm-emmc-flashing.md) to flash the CM3 board eMMC, i tried the "WINDOWS INSTALLER" section, but when the CM3 board plug into the computer USB port, the board is r...
by leelabks
Tue Aug 29, 2017 7:39 am
Forum: Troubleshooting
Topic: Cannot Rotate the LCD display touch screen
Replies: 4
Views: 1723

Re: Cannot Rotate the LCD display touch screen

i am not using the original Raspberry Pi 7 inch LCD panel, this LCD panel is from another brand. However, i am able to use the capacitive touch panel without rotating the screen. The problem is i cannot rotate the touch panel. In the earlier post, you mentioned that the USB ID will probably not work...
by leelabks
Mon Aug 28, 2017 8:50 am
Forum: Troubleshooting
Topic: Cannot Rotate the LCD display touch screen
Replies: 4
Views: 1723

Cannot Rotate the LCD display touch screen

I am using the latest Raspian ("Linux raspberrypi 4.4.50-v7+") downloaded from raspberrypi.org, i can use the command "display_rotate=2" to rotate the screen display 180degC but i cannot rotate the capacitive touch display. After some study, i use "lcd_rotate=2", but i still cannot achieve to rotate...
by leelabks
Mon Aug 28, 2017 8:45 am
Forum: Official Foundation Display
Topic: Cannot Rotate the LCD display touch screen
Replies: 4
Views: 2173

Cannot Rotate the LCD display touch screen

I am using the latest Raspian ("Linux raspberrypi 4.4.50-v7+") downloaded from raspberrypi.org, i can use the command "display_rotate=2" to rotate the screen display 180degC but i cannot rotate the capacitive touch display. After some study, i use "lcd_rotate=2", but i still cannot achieve to rotate...

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