Posted on May 17, 2011 at 13:40Try looking at the ST Library code, typically in \Keil\ARM\RV31\LIB\ST\STM32F10x\stm32f10x_pwr.c
/*******************************************************************************
* Function Name : PWR_EnterSTOPMode
* Description : Enters STOP mode.
* Input : - PWR_Regulator: specifies the regulator state in STOP mode.
* This parameter can be one of the following values:
* - PWR_Regulator_ON: STOP mode with regulator ON
* - PWR_Regulator_LowPower: STOP mode with
* regulator in low power mode
* - PWR_STOPEntry: specifies if STOP mode in entered with WFI or
* WFE instruction.
* This parameter can be one of the following values:
* - PWR_STOPEntry_WFI: enter STOP mode with WFI instruction
* - PWR_STOPEntry_WFE: enter STOP mode with WFE instruction
* Output : None
* Return : None
*******************************************************************************/
void PWR_EnterSTOPMode(u32 PWR_Regulator, u8 PWR_STOPEntry)
{
u32 tmpreg = 0;
/* Check the parameters */
assert_param(IS_PWR_REGULATOR(PWR_Regulator));
assert_param(IS_PWR_STOP_ENTRY(PWR_STOPEntry));
/* Select the regulator state in STOP mode ---------------------------------*/
tmpreg = PWR->CR;
/* Clear PDDS and LPDS bits */
tmpreg &= CR_DS_Mask;
/* Set LPDS bit according to PWR_Regulator value */
tmpreg |= PWR_Regulator;
/* Store the new value */
PWR->CR = tmpreg;
/* Set SLEEPDEEP bit of Cortex System Control Register */
*(vu32 *) SCB_SysCtrl |= SysCtrl_SLEEPDEEP_Set;
/* Select STOP mode entry --------------------------------------------------*/
if(PWR_STOPEntry == PWR_STOPEntry_WFI)
{
/* Request Wait For Interrupt */
__WFI();
}
else
{
/* Request Wait For Event */
__WFE();
}
}
/*******************************************************************************
* Function Name : PWR_EnterSTANDBYMode
* Description : Enters STANDBY mode.
* Input : None
* Output : None
* Return : None
*******************************************************************************/
void PWR_EnterSTANDBYMode(void)
{
/* Clear Wake-up flag */
PWR->CR |= CR_CWUF_Set;
/* Select STANDBY mode */
PWR->CR |= CR_PDDS_Set;
/* Set SLEEPDEEP bit of Cortex System Control Register */
*(vu32 *) SCB_SysCtrl |= SysCtrl_SLEEPDEEP_Set;
/* Request Wait For Interrupt */
__WFI();
}
