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JSupc.1
JSupc.1
Associate II
July 30, 2021
Question

Correct pin for LCD_TE_PIN on STM32412G-DISCOVERY. Is it GPIO_PIN_3 (as in stm32cube source code) or GPIO_PIN_4 (as in datasheet)

  • July 30, 2021
  • 6 replies
  • 2205 views

Hello,

I am studying the STM32412G-DISCOVERY and I can't explain why, in line 153 of the file /Drivers/BSP/STM32412G-Discovery/stm32412g_discovery_lcd.h (https://github.com/STMicroelectronics/STM32CubeF4), it says that the LCD_TE_PIN is GPIO_PIN_3. In the documentation (pages 26 and in the schematics), it always says that LCD_TE is PG4. As far as I understand, this pin is not really used in the code, but I find it confusing.

Thank you in advance for your reply.

[And by the way, do you know why the directory for this board is STM32412G-Discovery and not STM32F412G-Discovery (with the F)? The other boards have all the "F" (STM32F401-Discovery, STM32F429I-Discovery, ...]

Best regards,

-- Jacques

This topic has been closed for replies.

6 replies

Tesla DeLorean
Tesla DeLorean
Guru
July 31, 2021

I see what you mean, I think the PG3 is a miss-read of the schematic, and it is PG4

Surely you can confirm the actual wiring/connectivity, and observe the periodicity of the TE signal, via looking at the PG3 and PG4 as visible within the STM32

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JSupc.1
JSupc.1Author
Associate II
July 31, 2021

Thank you very much for your reply. I will make some experiments to confirm that the signal is really on PG4. If so, should I make a pull request to the git repository?

Tesla DeLorean
Tesla DeLorean
Guru
July 31, 2021

That might be the most effective way to get the issue in front of someone.​

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Mike_ST
Mike_ST
ST Technical Moderator
August 6, 2021

It seems like the LCD_TE was on PG3 in the first design, and changed to PG4. But the lcd.h file has not been updated since...

A ticket has been entered.

In order to give better visibility on the answered topics, please click on 'Best answer' on the reply which solved your issue or answered your question. 
ChahinezC
ChahinezC
Associate II
August 6, 2021

Internal ticket number: 111673 (PS: This is an internal tracking number and is not accessible or usable by customers)

Chahinez.

JSupc.1
JSupc.1Author
Associate II
August 6, 2021

Thank you very much. I am pleased to be able to contribute to the quality of the software in this way.

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