Posted on January 17, 2017 at 13:39I�m working on a time critical application with OpenSTM32 System Workbench for STM32 .
I�d like to reduce the call time of HAL_PWR_EnterSLEEPMode(uint32_t Regulator, uint8_t SLEEPEntry).
The code :
void
Sleep(
uint8_t
SLEEPEntry )
{
// Select the regulator state in Sleep mode: Set PDDS and LPSDSR bit according to PWR_Regulator value
MODIFY_REG(PWR->
CR
, (PWR_CR_PDDS | PWR_CR_LPSDSR), PWR_MAINREGULATOR_ON );
// Clear SLEEPDEEP bit of
Cortex
System Control Register
CLEAR_BIT(SCB->
SCR
, ((
uint32_t
)SCB_SCR_SLEEPDEEP_Msk));
// Select SLEEP mode entry
if
(SLEEPEntry == PWR_SLEEPENTRY_WFI)
{
__WFI();
// Request Wait For Interrupt
}
else
{
__SEV();
// Request Wait For Event
__WFE();
__WFE();
}
}
I do not need the WIFI and WFE selection! I prefer SleepWFI() and SleepWFE() INLINE functions.
If I remove the if statement the program freeze !
�
CLEAR_BIT(SCB->
SCR
, ((
uint32_t
)SCB_SCR_SLEEPDEEP_Msk));
// Select SLEEP mode entry
//if
(SLEEPEntry == PWR_SLEEPENTRY_WFI)
{
__WFI();
// Request Wait For Interrupt
}
I tried with some extra NOP before _WFI() ... without success.
I do not understand !
It is OK :
if
(SLEEPEntry == PWR_SLEEPENTRY_WFI)
{
__ASM
volatile
(
'NOP'
);
}
__WFI();
// Request Wait For Interrupt
The code can not run without if() !!!!
Thanks for help.
#if-selection-remove-before-__wfi().
