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EB3 GLCD Timeout
Posted: Mon Aug 24, 2026 12:54 pm
by mnfisher
I might be doing something wrong... On an ebocks-3 esp I tried to get the display working.
I couldn't find the source to glcd_eb3 (auto included in project).
--- 0x4200e678: task_wdt_isr at C:/Espressif/frameworks/esp-idf-v5.5/components/esp_system/task_wdt/task_wdt.c:509
--- 0x403770ed: _xt_lowint1 at C:/Espressif/frameworks/esp-idf-v5.5/components/xtensa/xtensa_vectors.S:1240
--- 0x40041a79: ets_delay_us in ROM
--- 0x4200bbcd: FCD_029f2_gLCD_EB3__ReceiveReply at D:/Projects/Flowcode/eblocks3/main/esp-project.c:1868
--- 0x4200bc6b: FCD_029f2_gLCD_EB3__SendCommand at D:/Projects/Flowcode/eblocks3/main/esp-project.c:2054
--- 0x4200bd5b: FCD_029f2_gLCD_EB3__ClearDisplay at D:/Projects/Flowcode/eblocks3/main/esp-project.c:2705
--- 0x4200becb: app_main at D:/Projects/Flowcode/eblocks3/main/esp-project.c:2968
--- 0x4201dbf0: main_task at C:/Espressif/frameworks/esp-idf-v5.5/components/freertos/app_startup.c:208
--- 0x4037b2a9: vPortTaskWrapper at C:/Espressif/frameworks/esp-idf-v5.5/components/freertos/FreeRTOS-Kernel/portable/xt
Re: EB3 GLCD Timeout
Posted: Mon Aug 24, 2026 1:31 pm
by BenR
Hello,
Just tried your program here and it's working great for me first time. The hope is that this should be very plug and play.
There is a problem in that the colour is very dark and so you might not instantly recognise it redrawing. The colour bit depth is masked from the top end so you can just call random() or if you want to mask to the bit depth then random() & 0b11111000. It's done like this so it correctly works with 24-bit RGB input.
The component itself can be found under Displays -> Graphical Colour. Maybe I should also include it in the Hardware ->? EB3 section.
Are you saying you get watchdog related resets?
When you power up the E-Block board do you get the Matrix splash screen? I wonder if it's missing its firmware?
Re: EB3 GLCD Timeout
Posted: Mon Aug 24, 2026 2:35 pm
by mnfisher
Hi Ben,
Yes - it's giving WDT restarts (as per messages above)- and the display doesn't seem to clear?
Martin
Re: EB3 GLCD Timeout
Posted: Mon Aug 24, 2026 4:25 pm
by mnfisher
... I did get the splash screen until I re-flashed with the above. Now - just lights on nobody home
If I added a UART - I could print Hello World - before the loop and that worked AOK.
Re: EB3 GLCD Timeout
Posted: Mon Aug 24, 2026 4:28 pm
by mnfisher
I found a link to the component source in the Wiki - but it's 404 page not found