RepPanel - A DIY alternative to the PanelDue with WiFi support

zapta

@bearer said in RepPanel - A DIY alternative to the PanelDue with WiFi support:

empirical data?

I have a 3.5" and I don't see why it should be less reliable than similar TFT screens.

BTW, one cool feature of the Nextion is the ability to run the MCU code against a simulator on your computer, via serial over USB. A little bit tricky but doable. This is how I took the screenshots for the documentation.

However, the lvgl library is intriguing. I plan to play with it and see how easy it is to design and use GUIs. One thing I would like to try one day is a battery operated Duet monitor with ePaper display for a long battery life, maybe even with a small indoor solar panel.

littlehobbyshop

@seeul8er Thanks for your help. Display is now working, the invert was on and now it's off.
Now struggling with the touch, it's an XPT2046 capcitive touch, I'm getting feedback on the monitor so at least the interrupt is wired correctly but no co-ordinates.
Looking through some LVGL posts others have had issues with the SPI speed and it looks like there have been updates to the XPT2046 driver in recent months but there's lots that is new here for me and I could be heading down the wrong rabbit hole.
Any pointers?

oliof

Hi,
I ordered a display and ESP32, but all I get is a white screen. Looking at a serial console, I get the following output:


rst:0x1 (POWERON_RESET),boot:0x17 (SPI_FAST_FLASH_BOOT)
configsip: 0, SPIWP:0xee
clk_drv:0x00,q_drv:0x00,d_drv:0x00,cs0_drv:0x00,hd_drv:0x00,wp_drv:0x00
mode:DIO, clock div:2
load:0x3fff0018,len:4
load:0x3fff001c,len:6960
ho 0 tail 12 room 4
load:0x40078000,len:14076
load:0x40080400,len:4352
entry 0x400806ec
[0;32mI (74) boot: Chip Revision: 1[0m
[0;32mI (74) boot_comm: chip revision: 1, min. bootloader chip revision: 0[0m
[0;32mI (41) boot: ESP-IDF v4.0.1 2nd stage bootloader[0m
[0;32mI (41) boot: compile time 13:22:55[0m
[0;32mI (41) boot: Enabling RNG early entropy source...[0m
[0;32mI (45) boot: SPI Speed      : 40MHz[0m
[0;32mI (49) boot: SPI Mode       : DIO[0m
[0;32mI (53) boot: SPI Flash Size : 4MB[0m
[0;32mI (57) boot: Partition Table:[0m
[0;32mI (61) boot: ## Label            Usage          Type ST Offset   Length[0m
[0;32mI (68) boot:  0 nvs              WiFi data        01 02 00009000 00006000[0m
[0;32mI (76) boot:  1 phy_init         RF data          01 01 0000f000 00001000[0m
[0;32mI (83) boot:  2 factory          factory app      00 00 00010000 00200000[0m
[0;32mI (91) boot: End of partition table[0m
[0;32mI (95) boot_comm: chip revision: 1, min. application chip revision: 0[0m
[0;32mI (102) esp_image: segment 0: paddr=0x00010020 vaddr=0x3f400020 size=0x80728 (526120) map[0m
[0;32mI (299) esp_image: segment 1: paddr=0x00090750 vaddr=0x3ffb0000 size=0x041cc ( 16844) load[0m
[0;32mI (306) esp_image: segment 2: paddr=0x00094924 vaddr=0x40080000 size=0x00400 (  1024) load[0m
[0;32mI (307) esp_image: segment 3: paddr=0x00094d2c vaddr=0x40080400 size=0x0b2e4 ( 45796) load[0m
[0;32mI (334) esp_image: segment 4: paddr=0x000a0018 vaddr=0x400d0018 size=0xc0010 (786448) map[0m
[0;32mI (616) esp_image: segment 5: paddr=0x00160030 vaddr=0x4008b6e4 size=0x0c68c ( 50828) load[0m
[0;32mI (652) boot: Loaded app from partition at offset 0x10000[0m
[0;32mI (652) boot: Disabling RNG early entropy source...[0m
[0;32mI (653) cpu_start: Pro cpu up.[0m
[0;32mI (656) cpu_start: Application information:[0m
[0;32mI (661) cpu_start: Project name:     reppanel_esp32[0m
[0;32mI (666) cpu_start: App version:      v1.0.2-dirty[0m
[0;32mI (672) cpu_start: Compile time:     Jun 22 2020 18:25:51[0m
[0;32mI (678) cpu_start: ELF file SHA256:  8b85d585a6bdd293...[0m
[0;32mI (684) cpu_start: ESP-IDF:          v4.0.1[0m
[0;32mI (689) cpu_start: Starting app cpu, entry point is 0x40081468[0m
[0;32mI (0) cpu_start: App cpu up.[0m
[0;32mI (699) heap_init: Initializing. RAM available for dynamic allocation:[0m
[0;32mI (706) heap_init: At 3FFAE6E0 len 00001920 (6 KiB): DRAM[0m
[0;32mI (712) heap_init: At 3FFDA238 len 00005DC8 (23 KiB): DRAM[0m
[0;32mI (718) heap_init: At 3FFE0440 len 00003AE0 (14 KiB): D/IRAM[0m
[0;32mI (725) heap_init: At 3FFE4350 len 0001BCB0 (111 KiB): D/IRAM[0m
[0;32mI (731) heap_init: At 40097D70 len 00008290 (32 KiB): IRAM[0m
[0;32mI (737) cpu_start: Pro cpu start user code[0m
[0;32mI (755) spi_flash: detected chip: generic[0m
[0;32mI (756) spi_flash: flash io: dio[0m
[0;32mI (756) cpu_start: Starting scheduler on PRO CPU.[0m
[0;32mI (0) cpu_start: Starting scheduler on APP CPU.[0m
[0;32mI (210) ILI9488: ILI9488 initialization.[0m
[0;32mI (510) ILI9488: Enabling backlight.[0m
[0;32mI (510) FT6X36: Found touch panel controller[0m
[0;31mE (510) FT6X36: Error reading from device: ERROR[0m
[0;32mI (510) FT6X36: 	Device ID: 0x00[0m
[0;32mI (520) FT6X36: 	Chip ID: 0x00[0m
[0;32mI (520) FT6X36: 	Device mode: 0x00[0m
[0;32mI (530) FT6X36: 	Firmware ID: 0x00[0m
[0;32mI (530) FT6X36: 	Release code: 0x00[0m

I double checked the wiring twice, but cannot rule out the possibility of miswiring of course, but I also cannot find an error myself.

oliof

Reading more of the thread closely again, the display turns on when switching to 5V, but it looks like the touch controller is not being detected correctly.

seeul8er

@oliof What display? The recommended one? Can you post your wiring please, especially the touch panel stuff.

oliof

I got the recommended panel (ER-TFTM035-6). Wiring is as per README.md,

ESP32 GPIO	TFT Pin	Color
13	27	white
14	24	yellow
15	23	grey
22	30	orange
21	31	brown
4	21	violet
2	25	green
27	29	blue

Some photos at https://photos.app.goo.gl/gmXPoCFF2FA5Ge2M8

NB: I can only get the display working with the precompiled binaries, building from source was quite hairy to set up, and all I get is a white screen. I didn't find documentation about how to configure the screen correctly, so I am fumbling around a bit there.

oliof

@oliof said in RepPanel - A DIY alternative to the PanelDue with WiFi support:

(510) FT6X36: Found touch panel controller
(510) FT6X36: Error reading from device: ERROR
(510) FT6X36: 	Device ID: 0x00
(520) FT6X36: 	Chip ID: 0x00
(520) FT6X36: 	Device mode: 0x00
(530) FT6X36: 	Firmware ID: 0x00
(530) FT6X36: 	Release code: 0x00

It looks like I ordered the screen with the resistive touch panel, so this can't work (FT6x36 is capacitative if I got it right). I will see if I can get my own build up.

seeul8er

@oliof Was about to suggest that. Your touch panel looks a little different than mine. You can check if J8 on the TFT is closed. Closed means resistive touch.

You can configure the build by dunning

idf.py menuconfig

Check the config options.
Set the display controller manually to ILI9488. The resistive touch panel is a XPT2046. Configure that one as well. You can choose the pins now. I recommend to go with the ones from the readme

oliof

The RepPanel Readme or the LVGL Readme?

seeul8er

@oliof The RepPanel Readme. At least what the TFT is concerned. The touch controller should be SPI as far as I rememember. So you will need to hook it up to the VSPI of the ESP32. The default pins of LVGL should work fine I guess. I updated the repo a few days ago so make sure you use the latest lv_conf.h (copy content from lv_conf_back.h). It fixes random UI freezes.

oliof

@seeul8er I checked out master and will try to sort this out over the weekend. Thanks for your help so far!

oliof

Unfortunately the weekend didn't have enough time for me to figure things out. Between menuconfig selections not sticking, PIN definitions that aren't part of any readme, and possibly bad cables I can't say I've had any success moving forward. The most timely solution seems to be to order another screen with 3.3v and capacitative touch and trying again with that ...

littlehobbyshop

I still can't get my SPI touchscreen working. Feeling I'm in over my head. I just don't know how to troubleshoot this stuff.

seeul8er

@oliof @littlehobbyshop I don't think that the 5V version is any problem. It can be tricky to get the config right. I'd go and config all pins manually with menuconfig. Maybe use these pins as a hint for a start. Then you just need to wire it accordingly. If the TFT does not have proper docs ... thats a different story.

According to the git the XPT2046 driver has not been updated since. So By using the recommended/supported commit ID of LVGL for ESP32 you have the up to date driver

pandaym

@littlehobbyshop said in RepPanel - A DIY alternative to the PanelDue with WiFi support:

I still can't get my SPI touchscreen working. Feeling I'm in over my head. I just don't know how to troubleshoot this stuff.

Sorry man, I completely forgot to answer you. Where are you with this now? I absolutely do not know what I am doing with stuff like this, so I just lucked out getting it working. I can try and figure out some details if you still need it?

oliof

@seeul8er thanks for the encouraging words ... I tried those pins as well. The 5V isn't a problem as I can feed it from the 5V pin and it lights up with your firmware (just without any touch support, of course) -- I just decided to stick with 3.3V on the re-order to avoid any surprises.

I will need to go back and try to get this going, but I can't even replicate your build by following the instructions. So I must be doing something wrong.

oliof

Sorry, I am too dense. The pin numbers in the lvgl readme -- are those the one on the TFT, or the one on the ESP32? I constantly seem to take one list for the other and have so far not been able to tell them apart reliably enough to avoid cabling errors it seems.

seeul8er

@oliof The LVGL docs only specify ESP32 pins. You need to find their counterpart on your TFT

oliof

I found the counter parts in the official buydisplay documentation. I know they're right for the TFT part because that lights up with your precompiled binary. Can you maybe share your sdkconfig from the RepPanel_ESP32 directory that you used when building the current latest binary?

seeul8er

@oliof https://pastebin.ubuntu.com/p/MWBQH2tVSR/