RepPanel - A DIY alternative to the PanelDue with WiFi support

seeul8er · 28 Jun 2020, 22:18

Make sure you checkout the LVGL repo at exactly this commit:

git checkout c1f43bfb090df293059ab52baabbdbdd8df00712

The predefined board pinout does not matter. You can set it to manual/None. Just make sure the pins for TFT and touch are defined exactly the way you plan on wiring them.
You have two separate SPI connections. One for the TFT and one for the touch controller. So the "0" in your display pin assignment are wrong since MOSI must be 13, MISO does not matter I think, DC (Data) must be 2 - just as we said above.
The touch pin config looks good. But you wired GPIO 25 for IRQ (interrupt) - go change it from 27 to 25 then or rewire
Adjust the TFT pixel resolution (480x320).

Yes. I think you got the duet UART config right. Otherwise switch the cables

The SSID & password are set via the RepPanel GUI once compiled and flashed.

pandaym · 29 Jun 2020, 08:06

@seeul8er said in RepPanel - A DIY alternative to the PanelDue with WiFi support:

Make sure you checkout the LVGL repo at exactly this commit:
git checkout c1f43bfb090df293059ab52baabbdbdd8df00712

Once again thank you.

After having sort of found out what commits are etc. I hope I found out the way to check it out at that. Is it correct that after cloning I navigate to RepPanel_ESP32\externals\lv_port_esp32 and run the "git checkout c1f43bfb090df293059ab52baabbdbdd8df00712". This gives me the following message:

HEAD is now at c1f43bf Merge pull request #139 from an-erd/fix_mono_disp

Have I gotten that right?

@seeul8er said in RepPanel - A DIY alternative to the PanelDue with WiFi support:

You have two separate SPI connections. One for the TFT and one for the touch controller. So the "0" in your display pin assignment are wrong since MOSI must be 13, MISO does not matter I think, DC (Data) must be 2 - just as we said above.

Alright, I understand most of that now. I have just rearranged the wiring according to the config to make it easier to see the correlation. It seemed as then I was missing the MOSI for TFT. I have tried to rework it, hopefully this sorts it out:

Full Wiring - ESP -> LCD

Power:
3.3V -> Pin 1
GND -> Pin 6

TFT:
GPIO 13 -> 19 MOSI
GPIO 18 -> 23 Serial Clock (Shared between TFT and Touch)
GPIO 15 -> 24 - Slave select
GPIO 2 -> 18 - Data
GPIO 4 -> Pin 22 - Reset

Touch:
GPIO 19 -> 21 MISO
GPIO 18 -> 23 Serial Clock (Shared between TFT and Touch)
GPIO 5 -> 26 Slave select
GPIO 25 -> 11 IRQ

Other than that I got:
Touch controller:

Display controller:

Am I getting there?

pandaym · 29 Jun 2020, 08:43

I thought I would just give it a try to see if something showed up. So I:

Saved the configuration in the menuconfig
Ran idf.py build
Connected USB to the ESP32 and found that it was on COM9
Ran idf.py -p COM9 flash

Unfortunately, the display never came on. So I wondered if it needed power on other pins and used my multimeter to check. I could see that the two 3.3V pins on the screen are internally connected, so are the two 5V pins and the five ground pins.

So I thought that it probably needs both 5V and 3.3V, so I wired 5V from the ESP32 to pin 2 on the screen.

When I plugged USB back in, the screen lit up, but nothing happened:

seeul8er · 29 Jun 2020, 12:18

@pandaym Your config looks good now. Yes you got the commit thing right. Otherwise you'd get a compile error.
Can you check the debug log please? You can do that by running:

idf.py monitor

The 5V & 3.3V thing is strange. I'll take a look at the data sheet later.

pd · 29 Jun 2020, 18:06

@seeul8er Thanks for your reply. I had in fact bought the LCD but the resistive touch version. I've been waiting for the capacitive one to come so that I can have another try. Would there be much reprogramming needed to use the resistive touch version?

seeul8er · 29 Jun 2020, 21:15

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

@seeul8er Thanks for your reply. I had in fact bought the LCD but the resistive touch version. I've been waiting for the capacitive one to come so that I can have another try. Would there be much reprogramming needed to use the resistive touch version?

Not at all, but you'll need to compile and flash the image yourself. Choose the XPT2046 chip as a touch screen controller and the ILI9488 for TFT in "idf.py menuconfig" and set the pins you want to use (take a look at above posts for the XPT2046 & the RepPanel repo for TFT related pins). After that check the datasheet of the display and connect the wires accordingly (You'll have two SPIs - TFT and touch). For the TFT related GPIOs you can use my config. Only the touch controller will be different.

pandaym · 29 Jun 2020, 23:03

@seeul8er said in RepPanel - A DIY alternative to the PanelDue with WiFi support:

@pandaym Your config looks good now. Yes you got the commit thing right. Otherwise you'd get a compile error.
Can you check the debug log please? You can do that by running:
idf.py monitor
The 5V & 3.3V thing is strange. I'll take a look at the data sheet later.

I ran idf.py monitor, and it looks like something from the Matrix. Still haven't gotten anything on screen.

seeul8er · 30 Jun 2020, 06:24

@pandaym Check the docs on that. Further down it says changing the Main XTAL frequency might solve the output issue. Maybe autodetect does the trick.

pandaym · 30 Jun 2020, 08:55

@seeul8er said in RepPanel - A DIY alternative to the PanelDue with WiFi support:

@pandaym Check the docs on that. Further down it says changing the Main XTAL frequency might solve the output issue. Maybe autodetect does the trick.

Same thing regardless of XTAL frequency. I rebuilt and reflashed between attempting them. Then I disconnected all my wiring to run the ESP32 on its own, still no luck.

I then navigated to the examples and tried to build and flash the hello world example - this works fine:

I went through the menuconfig on this vs. RepPanel, and found some differences in flash size and baud rate for monitor. I changed the Flash size to 2 like on Hello World, but then it would not flash because of insufficient space. I then tried changing idf.py monitor baud rate to 115200, while keeping 4mb flash size, and then I got monitor running:

Shall I try and wire it back up? Also, what do you think I have to do about power? Still haven't figured whether I should need to connect both a 5V and a 3.3V cable from the ESP32 to the screen.

seeul8er · 30 Jun 2020, 11:52

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

Shall I try and wire it back up? Also, what do you think I have to do about power? Still haven't figured whether I should need to connect both a 5V and a 3.3V cable from the ESP32 to the screen.

Try using only the 5V input. I am pretty sure you do not need both.
Looking at the logs I'd say that the flash and startup of RepPanel were a success. I'd go wire it up again. Can only be a GPIO config or wiring issue.
Does your display feature any switches/bridged pins? Read something about that in the forums.

pandaym · 2 Jul 2020, 11:57

@seeul8er said in RepPanel - A DIY alternative to the PanelDue with WiFi support:

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

Shall I try and wire it back up? Also, what do you think I have to do about power? Still haven't figured whether I should need to connect both a 5V and a 3.3V cable from the ESP32 to the screen.

Try using only the 5V input. I am pretty sure you do not need both.
Looking at the logs I'd say that the flash and startup of RepPanel were a success. I'd go wire it up again. Can only be a GPIO config or wiring issue.
Does your display feature any switches/bridged pins? Read something about that in the forums.

Still no luck unfortunately.

I tried wiring it up to a Raspberry, just to confirm that it works. And that worked fine.

Must be a wiring issue, but I cannot find any diagram for it anywhere, I have just been counting them out and using their table.

whopping pochard · 2 Jul 2020, 13:37

@PCR Are plans still afoot to design a PCB for this project? I'd be interested... also thinking about the possibility of adding a small LiPo battery + charge controller to make it a dockable / portable interface!

pandaym · 2 Jul 2020, 20:53

I have managed to get the screen alive, but without any touch.
If I just set the touch panel to none in the menuconfig, then the screen comes alive. But if I actually configure the touch, it just blanks it out.

Any idea?

pandaym · 2 Jul 2020, 23:16

After a ton of work, it's finally alive:
https://www.youtube.com/watch?v=LbLHOhdqSiE

I had to set both display and touch to HSPI and change some GPIOs for some reason. But in the end it worked. The resisitive touch screen just isn't that great - should have gotten capacitive

PCR · 3 Jul 2020, 09:31

@whopping-pochard

yes after my summer holiday!

Best

whopping pochard · 3 Jul 2020, 10:47

@PCR

seeul8er · 11 Jul 2020, 21:28

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

After a ton of work, it's finally alive:
https://www.youtube.com/watch?v=LbLHOhdqSiE

I had to set both display and touch to HSPI and change some GPIOs for some reason. But in the end, it worked. The resistive touch screen just isn't that great - should have gotten capacitive

My replay is a bit delayed due to my vacation, but I am very glad to hear you got it working! Seems like the manufacturer needs to work on the docs a bot more.

PCR · 14 Jul 2020, 11:30

@seeul8er Do you have a link where to get the display in Germany?

Carlo · 14 Jul 2020, 14:28

@PCR
https://www.mouser.dk/ProductDetail/Seeed-Studio/308010014?qs=%2Fha2pyFadujFrWe34c%2Fp962d7Tsl7GBwUGpbcqXmB9KgWxdyEeTeaQ%3D%3D

seeul8er · 15 Jul 2020, 05:45

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

@seeul8er Do you have a link where to get the display in Germany?

If you want to use the compiled images you need to order it form Buydisplay. I do not know any German reseller. The link carlo postet seems to be a display that is lower in quality. Pandaym seemed to get it working but it was a bit tricky