how to set PA11&PA12 to USB_OTG_HS pin after it is set to GPIO

Yang Yang · ‎2024-12-23

Hello, ST experts

For some reason, PA12 of STM32U595VGT6 is set to GPIO at start up. But I can not find how to set PA12 to USB_DP again in any alternate function of AF1 to AF15.

BR

Yang

SofLit · ‎2024-12-23

@Yang Yang wrote:

Hello

Maybe I miss something. At powerup PA12 is configured to GPIO. And then it is need to be set to OTG_USB_DP. The code to set PA12 as GPIO looks like below

__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);

I mean what should I do to set PA12 as OTG_USB_DP after these codes. Does HAL_GPIO_DeInit(GPIOA, GPIO_PIN_12) works?

BR

Yang

If you meant by this you already configured the IO as inputs then you need to switch to USB function, yes. and enable/configure the USB after.

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Andrew Neil · ‎2024-12-23

Get CubeMX to configure it, then examine the code that it generates?

SofLit · ‎2024-12-23

Hello,

The issue is not clear.

I can set PA11 and PA12 for USB in CubeMx for STM32U595.

PS: There is no STM32U595VGT6 part number

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STTwo-32 · ‎2024-12-23

HELLO @Yang Yang

Infact, PA11 and PA12 provide OTG_HS additional functions, and they are not alternate functions:

When you enable the USB_OTG_HS (as done by my college @SofLit ) those Pins are automatically set to OTG_HS additional functions.

Best Regards.

STTwo-32

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Yang Yang · ‎2024-12-23

Hello, ST experts

Yes, actually I found that OTG_HS_DP is additional function. But I don't know how to configure it. In cubemx generated framework is that done by MX_USB_OTG_HS_PCD_Init()?

BR

Yang

SofLit · ‎2024-12-23

@Yang Yang wrote:

Yes, actually I found that OTG_HS_DP is additional function. But I don't know how to configure it. In cubemx generated framework is that done by MX_USB_OTG_HS_PCD_Init()?

You can use CubeMx and configure USB pins as I showed above.

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STTwo-32 · ‎2024-12-23

Hello @Yang Yang

It is not required to add the code to configure the USB DP/DM as those pins are directly connected to USB as soon as this peripheral is enabled.

Best Regards.

STTwo-32

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Yang Yang · ‎2024-12-23

Hello ST experts

In cubemx generated code framework, Does HAL_GPIO_DeInit(GPIOA, GPIO_PIN_12) can set PA12 to OTG_HS_DP function?

BR

Yang

SofLit · ‎2024-12-23

The pins config is not generated. These pins are used directly by the USB as soon as the USB is enabled.

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STTwo-32 · ‎2024-12-23

PA12 is internally set to OTG_HS_DP as soon as you Enable your USB_OTG as i said on my second comment (no code needed to do that).

Best Regards.

STTwo-32

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