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STM32L0 How do i disconnect the SW-DB once connected

Question asked by Kevin Bain on Oct 31, 2017
Latest reply on Nov 14, 2017 by Kevin Bain

Hi, I am using an STM32L053xx in StandBy mode for 500ms and Run mode for 2ms.  I have noticed in StandBy my PCB draws about 120u amps more after the SW-DB has been connected.

To correct this I need to disconnect the SW-DB cable and power down the PCB.  When the PCB powers up it is drawing 120u amps less power.

Now the STM32L0 dosnt have a Batt pin so I have a fat cap keeping the power up for RTC etc.  This means a "Power On" reset dosen't work or takes a long time.


I am assuming the MCU thinks its got a debugger attached and working harder to keep the debugger happy.

I have tried HAL_GPIO_DeInit(GPIOA, GPIO_PIN_13);    HAL_GPIO_DeInit(GPIOA, GPIO_PIN_14); but still the current wont reduce without a power down reset.


Can anyone help??

I can test if the debugger is connected by using:  (this detects the debugger connected reliably)

   if (HAL_GPIO_ReadPin(GPIOA, GPIO_PIN_13) && !HAL_GPIO_ReadPin(GPIOA, GPIO_PIN_14)) {
    // Ye change the SW ports to DIO


Is there a flag or function I can call to disconnect the debugger??

Is there a nicer way to test if the debugger is connected??