LCD 240x120 UC1608 with STM32F103RCT6

[EEJerry]

Hi all !
i user communication STM32F103RCT6 with LCD 240X120 Driver UC1608, my user library U8g2 not communication.
does anyone know at which step i am getting the error?

[EEJerry]

@olikraus Did you come up with any ideas? Thank you very much !

[EEJerry]

I check with osilo the SPI is not working.
the setup of the u8g2 library has not been successful.

[olikraus]

I check with osilo the SPI is not working.

ok, but then i think this problem is not related to u8g2.

Again I suggest to use stm32duino, because the SPI subsystem from there is known to work.

[EEJerry]

@olikraus do you have user Skyper, or Gmail, my send project code, you have check for my, configuar firmware .

[olikraus]

U8g2 is open source. I do this in my spare time, which is very limited.
I don't have time to review / fix any project.

[EEJerry]

i am switching to STM32 arduino, STM32F103C8T6 KIT, 4 wire SPI LCD communication mode.
Using an osilo meter to measure pulses, all pins have pulses, but the screen does not display data,

[olikraus]

The default behavior for u8g2 are low active CS signals. You might need to change this in the code, if your display requires active high CS (as stated in the schematic). What is the name of your constructor?

[olikraus]

Oh, it is already active high for this constructor:

u8g2/csrc/u8x8_d_uc1608.c

Lines 234 to 235 in 7c35179

	/* chip_enable_level = */ 1, /* uc1608 has high active CS */
	/* chip_disable_level = */ 0,

So ideally you should see the correct CS level with your scope.

I also see, that I marked this constructor with "experimental". It may not work reliable.
Maybe also test with U8G2_UC1608_ERC24064_1_4W_SW_SPI instead. Also remember to change the contrast with "setContrast" or even better, run the ContrastTest example to see whether there is any output.

[olikraus]

Ok, the user here confirms, that the 240x128 constructor works: #817

[olikraus]

And another confirmation is here: #101

[EEJerry]

i tried the library changes, i measure the signal the pins are all pulsed.
but the screen still has no data displayed.

[EEJerry]

Thank you so much @olikraus .
finally showing the data, I switched to soft SPI, 4-wire mode.