Sleep/Stop mode while using the USBPD lib

[RomThi]

Hi,

I have an issue with low power operation when using the USBPD library. We have successfully implemented a low power feature for our new product. After that we have started the development of a USBPD feature. The problem is, that after the function "USBPD_PreInitOs()" is called in main.c the power is much higher as it was before. As this function calls a static linked library, I have no idea what has been turned on and how to disable it again. Therefore I need your help as only you have the source code.

Here my simple steps to reproduce the problem:
Hardware (Nucleo144 STM32H563, STLINK-V3PWR):

1) In CubeMX I select the example USBPD_SNK, then I generate the code.

2) In main I add this two lines after USBPD_PreInitOs():

	USBPD_PreInitOs();
  /* USER CODE BEGIN 2 */
			
	HAL_SuspendTick();
	HAL_PWR_EnterSTOPMode(PWR_LOWPOWERREGULATOR_ON, PWR_STOPENTRY_WFE);

The current is 3600µA (3,6mA).

When commented out USBPD_PreInitOs() like here:

 	//USBPD_PreInitOs();
  /* USER CODE BEGIN 2 */
			
	HAL_SuspendTick();
	HAL_PWR_EnterSTOPMode(PWR_LOWPOWERREGULATOR_ON, PWR_STOPENTRY_WFE);

The current is <700µA (0,7mA).

I have tried a lot, e.g. reseting the PD but without full success. Like here:

	//USBPD_PreInitOs();
  /* USER CODE BEGIN 2 */
		
	__HAL_RCC_UCPD1_FORCE_RESET();
	__HAL_RCC_APB1_RELEASE_RESET();
	
	HAL_SuspendTick();
	HAL_PWR_EnterSTOPMode(PWR_LOWPOWERREGULATOR_ON, PWR_STOPENTRY_WFE);

With the reset of the PD the current is <1350µA (1,35mA), but still higher then the 700µA without calling USBPD_PreInitOs().

Do anyone has a idea what can I turn off to reverse the USBPD_PreInitOs()?

Regards,

Roman

[LLECH.1]

Hello RomThi,

You can find an example of a sink low power at this link X-CUBE-TCPP - USB Type-C software expansion for STM32Cube - STMicroelectronics.

the application SNK1M1_Sink_LPM inside that expansion illustrates a sink consuming less than 700µA.

Hopefully it may help you.

Best Regards,

[RomThi]

Hi, 

thank you for your quick replay. I try my luck in the example you mentioned, sounds like the right code.

Regards,

Roman

[RomThi · Accepted solution]

Hi,

using reverse engineering I found the solution. I simply found out what function call is the problem, it was "USBPD_CAD_Init(..)". Then I scanned all HW registers that are changed.

So I found this:

It seems that a port pin changes its function. After turned the pin back to input mode, the current is as before.

Here my test code:

  /* Call PreOsInit function */
  USBPD_PreInitOs();
  /* USER CODE BEGIN 2 */
	//------------------------------------------------------------------------------------
	__HAL_RCC_UCPD1_FORCE_RESET();
	__HAL_RCC_APB1_RELEASE_RESET();
  
	LL_GPIO_InitTypeDef GPIO_InitStruct = { 0 };

	GPIO_InitStruct.Pin = LL_GPIO_PIN_9;
	GPIO_InitStruct.Mode = LL_GPIO_MODE_INPUT;
	GPIO_InitStruct.Speed = LL_GPIO_SPEED_FREQ_LOW;
	GPIO_InitStruct.Pull = LL_GPIO_PULL_NO;
	LL_GPIO_Init(GPIOA, &GPIO_InitStruct);
	//------------------------------------------------------------------------------------
	HAL_SuspendTick();
	HAL_PWR_EnterSTOPMode(PWR_LOWPOWERREGULATOR_ON, PWR_STOPENTRY_WFE);

Regards,

Roman