Full flash rom Bigtreetech TFT35 V2.0

[marinercinco]

I have erased the complete bigtreetech tft35 v2.0 chip to be able to upgrade to tft35 v2.0.23 firmware.
Once updated, it does not recognize bigtreetec skr pro v1.1 "No printer attached"
You can supply me with the full flash rom to restore the communication of the RS232 port.
Thank you

[thisiskeithb]

Did you try loading the bootloader from here? You should be able to update once that’s loaded.

[marinercinco]

That has allowed me to update firmware, but with the accidental deletion of the chip there is no communication through the RS232 port.
I need to reload the complete rom of the chip to reestablish communication through the RS232 port.
Thank you

[HappyCodingRobot]

The bootloader together with the firmware are the complete ROM. The configurations are rewritten by the firmware. I intentionally erased the flash before writing the bootloader.
What interface do you use to delete and write? ST-link, BMP, jlink .. ?

[marinercinco]

The bootloader together with the firmware are the complete ROM. The configurations are rewritten by the firmware. I intentionally erased the flash before writing the bootloader.
What interface do you use to delete and write? ST-link, BMP, jlink .. ?

The total erase of the chip was with ST-LINK V2 of BAYTE and the prog. STM32 ST-LINK Utility.
Later I use the STM32CubeProgrammer.
Regardless of the bootloader, program or interface I use, I cannot communicate via the RS232 port.

[ipatch]

yeah if your using the tft35 v2 then some batches of those boards had issues with their bootloader and loading new firmware. i purchased a board from amz about a week ago and was able to compile the FW source without a problem and update the firmware on my lcd.

If your experiencing communication issues between your skr board and your lcd, then that may be a separate issue.

• are you able to communicate with your board using a different lcd (if you have one available) ?
• have you tried loading the precompiled marlin FW on your skr and the precompiled FW on your lcd provided by big tree tech?

personally if it were me, i would try using the precompiled versions both of the marlin fw for the skr board, and the precompiled fw for the lcd, and if your experiencing issues still, then it's more than likely a completely separate issue, but if you've been compiling marlin and lcd fw from source it is very easy to misconfigure things to where the lcd won't com with the board, i've experienced this first hand. 🙋‍♂️

[guruathwal]

The bootloader together with the firmware are the complete ROM. The configurations are rewritten by the firmware. I intentionally erased the flash before writing the bootloader.
What interface do you use to delete and write? ST-link, BMP, jlink .. ?

The total erase of the chip was with ST-LINK V2 of BAYTE and the prog. STM32 ST-LINK Utility.
Later I use the STM32CubeProgrammer.
Regardless of the bootloader, program or interface I use, I cannot communicate via the RS232 port.

you should check your TFT35 Serial by connecting its rs232 port to your computer via any USB to TTL converter any check both Baudrates 115200 and 250000. you should see "M105" received every few second if the TFT if working properly. be sure to cross-connect the Rx & Tx pin of TFT to TTL converter.

[marinercinco]

Hello,
Following its instructions, the RS232 port is dead. It does not respond with anything, it does not communicate ...
I have ordered a TFT35 V3.0.
Thank you for everyone's attention and help.
regards

[guruathwal]

Did you check to make sure the rx and tx pin are connected corectly?
Rx of usb TTL to Tx of TFT
Tx of usb TTL to Rx of TFT

[marinercinco]

Did you check to make sure the rx and tx pin are connected corectly?
Rx of usb TTL to Tx of TFT
Tx of usb TTL to Rx of TFT

Hello,
I have carried out the checks thoroughly and with different USB-TTL modules. I can only connect to the TFT through the SWD port.
In the tests I lost the touch of the TFT with the BIQU_TFT35_APP1_V2.0.24.2.bin firmware and recovered it by returning to the BIQU_TFT35_APP1_V2.0.24.bin firmware.
It would be possible to obtain the initial BIQU_TFT35_APP1_V2.0.20.bin firmware to try to recover the communication through the RS232 port. Does anyone have it?
I will be and I am very grateful for the help.
regards

[ipatch]

The bootloader together with the firmware are the complete ROM. The configurations are rewritten by the firmware. I intentionally erased the flash before writing the bootloader.
What interface do you use to delete and write? ST-link, BMP, jlink .. ?

The total erase of the chip was with ST-LINK V2 of BAYTE and the prog. STM32 ST-LINK Utility.
Later I use the STM32CubeProgrammer.
Regardless of the bootloader, program or interface I use, I cannot communicate via the RS232 port.

you should check your TFT35 Serial by connecting its rs232 port to your computer via any USB to TTL converter any check both Baudrates 115200 and 250000. you should see "M105" received every few second if the TFT if working properly. be sure to cross-connect the Rx & Tx pin of TFT to TTL converter.

is there a way to prevent the lcd from constantly sending the m105 cmds to the board, i like using the gcode console to send gcode to the board for diagnostic purposes, so when i send my cmd, the ouput disappears because the lcd is constantly sending m105 commands.

[marinercinco]

Did you check to make sure the rx and tx pin are connected corectly?
Rx of usb TTL to Tx of TFT
Tx of usb TTL to Rx of TFT

Hi,
I still have the problem of the "no printer attached" principle.
For the SWD port I have rewritten bootloader and updated firmware without problem.
Could someone provide me with the electrical scheme to verify the board and the components associated with the RS232 port.
Thanks in advance
Cheers

[guruathwal]

@marinercinco here is the manual for tft35v2 https://github.com/bigtreetech/BIGTREETECH-TFT35-V2.0/blob/master/TFT3.5-V2.0%20manual.pdf

[marinercinco]

Hi,
First of all apologize for my English, I use the Google translator.
The schematic does not come in the manual and I cannot check wire and components between RS232 and the MCU STM32F103VTC6.
I am very grateful for your attention.
Cheers