Enter Stop 2 mode.
* @note In Stop 2 mode, only low power voltage regulator is ON.
* @note In Stop 2 mode, all I/O pins keep the same state as in Run mode.
* @note All clocks in the VCORE domain are stopped, the PLL, the MSI,
* the HSI and the HSE oscillators are disabled. Some peripherals with wakeup capability
* (LCD, LPTIM1, I2C3 and LPUART) can switch on the HSI to receive a frame, and switch off the HSI after
* receiving the frame if it is not a wakeup frame. In this case the HSI clock is propagated only
* to the peripheral requesting it.
* SRAM1, SRAM2 and register contents are preserved.
* SRAM3 content is preserved depending on RRSTP bit setting (not available on all devices).
* The BOR is available.
* The voltage regulator is set in low-power mode but LPR bit must be cleared to enter stop 2 mode.
* Otherwise, Stop 1 mode is entered.
* @note When exiting Stop 2 mode by issuing an interrupt or a wakeup event,
* the HSI RC oscillator is selected as system clock if STOPWUCK bit in RCC_CFGR register
* is set; the MSI oscillator is selected if STOPWUCK is cleared.
* @PAram STOPEntry specifies if Stop mode in entered with WFI or WFE instruction. * This parameter can be one of the following values:
* @arg @ref PWR_STOPENTRY_WFI Enter Stop mode with WFI instruction
* @arg @ref PWR_STOPENTRY_WFE Enter Stop mode with WFE instruction"
All sdio lines reamin at 3V under Stop mode, I just checked with multimeter. Can it have someting to do with the clock?
