Run Different Functions Based on GPIO Mode (PA12 as Input or Output) – STM32G0

[Najd_Elaoud]

Hi everyone,

I'm working on an STM32G070CBTx, and I need to execute two different functions depending on the GPIO mode of pin PA12.

Specifically:

• If PA12 is configured as input (GPIO_MODE_INPUT), I want to run function1()

• If PA12 is configured as output push-pull (GPIO_MODE_OUTPUT_PP), I want to run function2()

Is there a way in HAL or LL to check the current mode of PA12 at runtime?
Or do I need to track the mode manually when I configure it?

Any suggestions or best practices for this kind of conditional GPIO-mode-based logic would be appreciated!

Thanks in advance!

[Sarra.S · Accepted solution]

Hello @Najd_Elaoud, 

One way is to visualize the GPIOx_MODER register. This register is responsible for configuring and storing the mode of each GPIO pin. 

Hope that helps!

[Najd_Elaoud]

Thanks for the suggestion; using the MODER and OTYPER registers did the trick!

Here’s the code I used (based on your advice), and it works perfectly:

// Check PA12 mode (MODER12, bits 25:24)
	  uint32_t PA12_MODE = (GPIOA -> MODER & GPIO_MODER_MODE12) >> GPIO_MODER_MODE12_Pos;
      // Check output type (OT12, bit 12)
      uint32_t PA12_OUTPUT_TYPE = (GPIOA -> OTYPER & GPIO_OTYPER_OT12) >> GPIO_OTYPER_OT12_Pos;

	  if (PA12_MODE == 0X00)		// Input mode
	  {
		  // USE ONLY WHEN PA12 IS SET AS INPUT
	  	  FUNCTION_1();
	  }
	  else if (PA12_MODE == 0X01 && PA12_OUTPUT_TYPE == 0X00)	// Output mode (Push-Pull)
	  {
		  // USE ONLY WHEN PA12 IS SET AS OUTPUT_PP
		  FUNCTION_2();
	  }

This lets me safely switch between the two functions based on the pin mode of PA12, just what I needed.

Really appreciate your help!