Posted on December 11, 2014 at 10:04Hello,
I'm trying to use the STANDBY low power mode on the STM32F103. I have verified that the User Option Bits are set such that IWDG=1, NoReset_STOP=1, NoReset_STBY=1. Therefore the processor should not reset when entering either STOP mode or STANDBY mode.
The following code seems to reset the processor even though NoReset_STBY=1:
void bl_mode_standby(void)
{
__disable_irq();
PWR->CR |= PWR_CR_CWUF; // In case the pin was high already
EXTI->PR = 0x007FFFFF; // Clear any pending EXTI interrupts
PWR_WakeUpPinCmd(ENABLE); /* Enable wake from WKUP pin*/
PWR_EnterSTANDBYMode();
}
When I check the reason for the reset RCC->CSR = 0x0c00_0000, meaning that it was a Power On Reset & NRST Pin. One thing to note on this HW design, the NRST is not connected (NC), but should have an internal pull-up. Not sure if this is a hint to my issue or not.
Does anyone have an idea why my STANDBY mode is not working and resetting the processor?
Thanks!
#stm32-stm32f103-reset-standby
