Hi everyone,
I’m working with the NUCLEO - WB15CC board and I’m trying to enter STOP1 mode to minimize current consumption. However, despite disabling all unnecessary peripherals, the power consumption remains unexpectedly high (much higher than in the PWR_STOP1 example provided by STM32Cube, which works fine on the same board).
What I’ve tried so far:
Called HAL_SuspendTick() before entering STOP mode and HAL_ResumeTick() after wakeup
Called hci_reset() to reset the BLE stack
Configured all GPIOs as analog with no pull (using GPIO_AllAnalog())
Disabled clocks for all unused peripherals:
__HAL_RCC_IPCC_CLK_DISABLE();
__HAL_RCC_HSEM_CLK_DISABLE();
__HAL_RCC_ADC_CLK_DISABLE();
__HAL_RCC_LPTIM1_CLK_DISABLE();
__HAL_RCC_LPTIM2_CLK_DISABLE();
__HAL_RCC_TIM1_CLK_DISABLE();
__HAL_RCC_TIM2_CLK_DISABLE();
Disabled all interrupts using __disable_irq() and cleared pending IRQs (RTC, IPCC, etc.)
- Set both cores (CPU1 and CPU2) to STOP1 using:
- LL_C2_PWR_SetPowerMode(LL_PWR_MODE_SHUTDOWN);
LL_PWR_SetPowerMode(LL_PWR_MODE_STOP1);
LL_LPM_EnableDeepSleep();
__WFI();
Despite all of this, I’m still seeing much higher current than expected. Strangely, if I flash the official PWR_STOP1 example from STM32Cube, it works perfectly and the consumption is very low (100 uA).
Also if I set LL_PWR_MODE_STANDBY the consuption is low indeed, but it is ok for me stop mode that should be around 100-200 uA. However using an amperometer I reach 3mA...
My question:
What could be preventing STOP1 mode from reducing the current properly in my application, even though all peripherals and interrupts seem to be handled correctly? Are there hidden wake-up sources or configuration steps I might be missing?
Any insights would be highly appreciated!
