BIGTREE_TFT35_V3.0_E3

[Sineos]

Commit: 9e32d73
Display: BIGTREE_TFT35_V3.0_E3

Only showing "NoTouchFW V1.1" on a otherwise black screen.

Thanks for keeping working on it!

[teeminus]

Please try the binary from the revert_cleanup branch. Thats just the new parser added to the previous release (which seemed to partly work)

[Sineos]

No luck unfortunately. Same behavior.

[teeminus]

Place the following code snipped before // Init slave SPI in the main.cpp and recompile:

  const uint8_t pData[] = {0xf8, 0x30, 0x00, 0x00, 0x10, 0x00, 0x60, 0x00, 0xc0, 0xf8, 0x80, 0x00, 0xfa, 0x40, 0x10, 0x40, 0x10};
  for (int i = 0; i < sizeof(pData); ++i) {
    st7920Emulator.parseSerialData(pData[i]);
  }
  while(1);

The letter 'A' should appear twice on your screen.

[Sineos]

Which branch you want me to try?

[teeminus]

Please use the revert_cleanup branch. If the code snipped works there (at least shows the expected results) you can try it in the master branch :)

[Sineos]

Works for both branches. I see a "NoTouchFW V1.1" heading followed by "AA" a bit below.

[teeminus]

Thats great. At least the parser and the callback seems to work :) Can you move the snippet below the SPI_Slave call and check if that works as well?

BTW, how does the display section of you klipper config look like? For me it looks like this:

[display]
lcd_type: st7920
cs_pin: EXP1_4
sclk_pin: EXP1_5
sid_pin: EXP1_3
encoder_pins: ^EXP2_5, ^EXP2_3
click_pin: ^!EXP1_2

[Sineos]

SKR1.4T

[display]
lcd_type: st7920
cs_pin: EXP1_7
sclk_pin: EXP1_6
sid_pin: EXP1_8
encoder_pins: ^EXP1_5, ^EXP1_3
click_pin: ^!EXP1_2

But this was a perfect hint: I had a typo in there. Corrected now and what shall I say: IT WORKS 👍

Looks good and also the fan animation works without flashing the display. Also switching to the menu comes up nicely.

Sorry for the noise and big kudos for your work.

[teeminus]

Glad to hear that 🙏 😌 Have fun with the display ☺️

P.S.: Is the config you posted correct? If not, please post the config here for others to find.

[Sineos]

[board_pins]
aliases: 
	EXP1_1=P1.30, EXP1_3=P1.18, EXP1_5=P1.20, EXP1_7=P1.22, EXP1_9=<GND>,
	EXP1_2=P0.28, EXP1_4=P1.19, EXP1_6=P1.21, EXP1_8=P1.23, EXP1_10=<5V>,
	EXP2_1=P0.17, EXP2_3=P3.26, EXP2_5=P3.25, EXP2_7=P1.31, EXP2_9=<GND>,
	EXP2_2=P0.15, EXP2_4=P0.16, EXP2_6=P0.18, EXP2_8=<RST>, EXP2_10=<NC>

[display]
lcd_type: st7920
cs_pin: EXP1_7
sclk_pin: EXP1_6
sid_pin: EXP1_8
encoder_pins: ^EXP1_5, ^EXP1_3
click_pin: ^!EXP1_2

This is my current SKR 1.4 Turbo configuration:

• Display works
• Encoder works
• Click works
• The only thing I noticed that sometimes after restarting Klipper, the display comes up garbled. Will require some service-restarts and/or firmware_restart

[teeminus]

Thats possible, I only parsed the klipper display startup sequence once, I don't know what happens then the emulator gets scrambled data or if it's even the emulators fault. If that really bothers you you can create a new issue for that. I will look into that anyways.

[Sineos]

No, doesn't bother me. Just wanted to give as feedback.

Thanks for your commitment.

[teeminus]

You are welcome :)

[Sineos]

Side note:
It might be worthwhile to collect working configs somewhere. Maybe a section in the Github's Discussions, e.g. new Discussion item with the board name as title and just paste [board_pins] and [display]

[stevehooker]

collect working configs somewhere

Yes please. And... Some beginner steps for flashing the firmware to the TFT screen. I've tried adding the precompiled BIGTREE_TFT24_V1.1.26.x.bin to an SD card, I expected that to be renamed to something like firmware.cur but alas no joy and I'm still on a black screen.

[teeminus]

I created a wiki with both installation instructions and the configurations listed here. If you'd like to have any additions to the texts there, please let me know.