Posted on July 20, 2015 at 21:42I write some code that seems to successfully put the chip into standby mode:
PWR->CR |= PWR_CR_PDDS;
SCB->SCR |= SCB_SCR_SLEEPDEEP;
while (1) { __asm(''WFI'')__; }
That seems to stop everything as expected. When I press the black reset button on the discovery, my code restarts as expected, but does not detect that it came out of Standby:
if (0 != (PWR->CSR & PWR_CSR_SBF)) {
from_standby = 1;
PWR->CR |= PWR_CR_CSBF;
}
. . .
The flag ''from_standby'' is never set here. What I'm trying to do is keep the chip in Standby most of the time, but when I come out I want the RTC to be valid. It's running on the LSI, so it should be OK, but since my code always thinks this is the first power-on, it sets the RTC rather than just enabling it.
Is the black button on the discovery more than a reset, or is there something else I'm missing?
