UART RX wake after STOP MODE

[DeusExMachina]

I cant wake up from UART RX

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static const mfEXTConfig extcfg =
{
      {
            {EXT_CH_MODE_DISABLED, NULL},                                          //0
            {EXT_CH_MODE_DISABLED, NULL},                                       //1
            {EXT_CH_MODE_DISABLED, NULL},                                       //2
            {EXT_CH_MODE_BOTH_EDGES | EXT_CH_MODE_AUTOSTART | EXT_MODE_GPIOA, uart_cb},   //3 UART2 Rx
            {EXT_CH_MODE_DISABLED, NULL},                                       //4
      ...   
      }
};

Although it works for RTC this dose not work for external RX line.
Also I had a question -> after going to sleep (STOP MODE)

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     SCB->SCR |= SCB_SCR_SLEEPDEEP_Msk;
     PWR->CR |= (PWR_CR_PDDS | PWR_CR_LPSDSR);
    __WFI();

Should I return to code line after __WFI() function? I never reach this point

[DeusExMachina]

sorry, I forgot to mention that I use stm32F051 MCU

[DeusExMachina]

Also I understand that when RTC wakes up MCU it resets May be someone has working example for stm32F051Discovery? Looks frustrating.

[Giovanni]

Never personally used sleep modes, sorry.

Giovanni

[DeusExMachina]

I was able to wake up after STOP mode using PWR_EnterSTOPMode function from STD periph. lib.
I can wake up from EXTi port line and RTC line. But!
I can wake up from RTC alarm only once. Something is wrong with RTC alarm, I tried to set RTC registers manually to reinit it, but with no success.
The alarm settings is correct - without sleep it fires periodically, but after wake up alarm doesn't work.
How to correctly reinit RTC and its clock source?

[DeusExMachina]

I solved wake up issue just setting

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       /* Enable the Backup Domain Access */
       PWR->CR |= PWR_CR_DBP;

after waking up. After this manipulation new alarm can be fired.