STM32U595 USB pins do not work as GPIO

[Yang Yang]

Hello ST experts

I found the same problem as previous post  https://community.st.com/t5/stm32-mcus-embedded-software/stm32f072xb-gpio-issue-usb-pins-do-not-work-as-gpio/m-p/151104#M8715 

But for stm32u595, I can not find the similar register USB_CNTR.PDWN. Is there any way to set PA12 as GPIO input?

Best Regards

Yang

[Elatewendy]

Hi，

I encountered the issue about PA11 and PA12 a month ago. I couldn't find a solution, so I asked our hardware designer to modify the circuit diagram and replace  with another GPIOs.:face_with_tears_of_joy:

GoodLuck！

[STTwo-32 · Accepted solution]

Hello @Yang Yang @Elatewendy 

According to the part 10.7.12 of the RM0456, "When PA11 and PA12 are used as standard GPIOs, USBPWREN and VDD11USBDIS bits in PWR_VOSR must be set prior to configure the GPIOs in a mode other than analog".

Best Regards.

STTwo-32

[Elatewendy]

hello,@STTwo-32.

I asked the same question at https://community.st.com/t5/stm32-mcus-products/stm32u595-used-pa12-and-pa11-as-input-gpios-can-t-get-the-high/td-p/635837 .

I made a mini project to read the registers.The GPIOA register are ZERO...

The result like as:

HW VERSION 001001
reg_pwr_init = 0x7c000
reg_pwr = 0x2fc000
reg_gpioa = 0x6700

#define HW_BIT0             HAL_GPIO_ReadPin(GPIOC, GPIO_PIN_7)
#define HW_BIT1             HAL_GPIO_ReadPin(GPIOC, GPIO_PIN_8)
#define HW_BIT2             HAL_GPIO_ReadPin(GPIOC, GPIO_PIN_9)
#define HW_BIT3             HAL_GPIO_ReadPin(GPIOA, GPIO_PIN_8)
#define HW_BIT4             HAL_GPIO_ReadPin(GPIOA, GPIO_PIN_11)
#define HW_BIT5             HAL_GPIO_ReadPin(GPIOA, GPIO_PIN_12)

int main(void)
{
  /* USER CODE BEGIN 1 */
	uint32_t  reg_pwr_init;
	uint32_t  reg_pwr;
  uint32_t  reg_gpio;

  /* USER CODE END 1 */

  /* MCU Configuration--------------------------------------------------------*/

  /* Reset of all peripherals, Initializes the Flash interface and the Systick. */
  HAL_Init();

  /* USER CODE BEGIN Init */

  /* USER CODE END Init */

  /* Configure the system clock */
  SystemClock_Config();

  /* Configure the System Power */
  SystemPower_Config();

  /* USER CODE BEGIN SysInit */
	reg_pwr_init = READ_REG(PWR->VOSR);
	SET_BIT(PWR->CR1 , PWR_CR1_FORCE_USBPWR);
	SET_BIT(PWR->VOSR, (PWR_VOSR_USBPWREN | PWR_VOSR_USBBOOSTEN));
	SET_BIT(PWR->VOSR, PWR_VOSR_VDD11USBDIS);

  
  /* USER CODE END SysInit */

  /* Initialize all configured peripherals */
  MX_GPIO_Init();
  MX_USART1_UART_Init();
  MX_ICACHE_Init();
  /* USER CODE BEGIN 2 */
	reg_pwr = READ_REG(PWR->VOSR);
	reg_gpio = READ_REG(GPIOA->IDR);
	printf("HW VERSION %d%d%d%d%d%d\r\n",HW_BIT5,HW_BIT4,HW_BIT3,HW_BIT2,HW_BIT1,HW_BIT0);
	printf("reg_pwr_init = 0x%x\r\n",reg_pwr_init);
	printf("reg_pwr = 0x%x\r\n",reg_pwr);
	printf("reg_gpioa = 0x%x\r\n",reg_gpio);
  /* USER CODE END 2 */

  /* Infinite loop */
  /* USER CODE BEGIN WHILE */
  while (1)
  {
    /* USER CODE END WHILE */

    /* USER CODE BEGIN 3 */
		HAL_GPIO_WritePin(GPIOD, GPIO_PIN_11, GPIO_PIN_SET);
		HAL_Delay(1000);
		HAL_GPIO_WritePin(GPIOD, GPIO_PIN_11, GPIO_PIN_RESET);
		HAL_Delay(1000);
  }
  /* USER CODE END 3 */
}

And the gpios configured like this:

[Yang Yang]

Hello, @STTwo-32 @Elatewendy 

Thanks for your quick reply.

I had a similar code as @Elatewendy  did in his post. And PA12 is logic low level, it seems GPIO setting is failed. 

Do I miss something? And also I will check my conclusion again these days.

/* Reset of all peripherals, Initializes the Flash interface and the Systick. */
HAL_Init();

/* USER CODE BEGIN Init */

/* USER CODE END Init */

/* Configure the system clock */
SystemClock_Config();

/* USER CODE BEGIN SysInit */
SET_BIT(PWR->VOSR, PWR_VOSR_VDD11USBDIS);
SET_BIT(PWR->VOSR, PWR_VOSR_USBPWREN);
__HAL_RCC_GPIOA_CLK_ENABLE();
GPIO_InitStruct.Pin = GPIO_PIN_12;
GPIO_InitStruct.Mode = GPIO_MODE_INPUT;
GPIO_InitStruct.Pull = GPIO_PULLUP;
HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);
pa12_state = HAL_GPIO_ReadPin(GPIOA, GPIO_PIN_12);
if(pa12_state == GPIO_PIN_RESET)
usb_mode_flag = 1;
/* USER CODE END SysInit */

/* Initialize all configured peripherals */
MX_GPIO_Init();
MX_GPDMA1_Init();
MX_DAC1_Init();

BR

Yang

[Yang Yang]

Hello， @STTwo-32 

I have checked again, and still PA12 can not be set as GPIO input. The voltage in this pin is about 0.4V, it seems still this pin works on USB related function. Any idea about this?

BR

Yang

[SStor]

Hello,

try this solution:

Solved: Problem with Pin A11 on STM32U595VJ - STMicroelectronics Community

Should be the same problem with USB stuff on PA11/12...

[Elatewendy]

Thanks @SStor 

I tested it and found that this method is effective.