Posted on July 26, 2013 at 12:06 Hi, i've got a problem with leaving from standby mode, both by RTC Alarm and WKUP pin. This is my code:
int
main(
void
)
{
#ifdef DEBUG
debug();
#endif
prvSetupHardware();
GPIOC->ODR |= (u16)0x0040;
PWR_EnterSTANDBYMode();
GPIOC->ODR &= (u16)~0x0040; while
(1) {};
}
static
void
prvSetupHardware(
void
)
{
RCC_APB2PeriphClockCmd( RCC_APB2Periph_GPIOA | RCC_APB2Periph_GPIOB |RCC_APB2Periph_GPIOC
| RCC_APB2Periph_GPIOD | RCC_APB2Periph_GPIOE | RCC_APB2Periph_AFIO, ENABLE );
NVIC_SetVectorTable( NVIC_VectTab_FLASH, 0x0 );
NVIC_PriorityGroupConfig( NVIC_PriorityGroup_4 );
vLedInitialise();
vEXTI_Configuration();
vNVIC_Configuration();
vRTC_Configuration(); PWR_WakeUpPinCmd(ENABLE);
}
void
vEXTI_Configuration(
void
)
{
EXTI_InitTypeDef EXTI_InitStructure;
/* Configure EXTI Line17(RTC Alarm) to generate an interrupt on rising edge */
EXTI_ClearITPendingBit(EXTI_Line17);
EXTI_InitStructure.EXTI_Line = EXTI_Line17;
EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;
EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Rising;
EXTI_InitStructure.EXTI_LineCmd = ENABLE;
EXTI_Init(&EXTI_InitStructure);
}
/*-----------------------------------------------------------*/
void
vNVIC_Configuration(
void
)
{
NVIC_InitTypeDef NVIC_InitStructure;
/* Configure one bit for preemption priority */
NVIC_PriorityGroupConfig(NVIC_PriorityGroup_1);
/*Enable the RTC Alarm Interrupt*/
NVIC_InitStructure.NVIC_IRQChannel = RTCAlarm_IRQChannel;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
}
/*-----------------------------------------------------------*/
void
vRTC_Configuration(
void
)
{
RCC_APB1PeriphClockCmd(RCC_APB1Periph_PWR | RCC_APB1Periph_BKP, ENABLE);
/* Allow access to BKP Domain */
PWR->CR |= 0x00000100;
RCC_LSEConfig(RCC_LSE_ON);
while
(RCC_GetFlagStatus(RCC_FLAG_LSERDY) == RESET) {}
RCC_RTCCLKConfig(RCC_RTCCLKSource_LSE);
RCC_RTCCLKCmd(ENABLE);
RTC_WaitForSynchro();
RTC_WaitForLastTask();
RTC_ITConfig(RTC_IT_ALR, ENABLE);
RTC_WaitForLastTask();
RTC_SetPrescaler(32767);
RTC_WaitForLastTask();
while
( RTC_GetFlagStatus( RTC_FLAG_SEC ) == RESET ) {}
RTC_SetAlarm(5);
RTC_WaitForLastTask();
}
void
RTCAlarm_IRQHandler(
void
)
{
GPIOC->ODR ^= 0x00000080;
EXTI_ClearITPendingBit(EXTI_Line17);
if
(PWR_GetFlagStatus(PWR_FLAG_WU) != RESET) PWR_ClearFlag(PWR_FLAG_WU);
RTC_WaitForLastTask();
RTC_ClearITPendingBit(RTC_IT_ALR);
RTC_WaitForLastTask();
}
I know that EXTI isn't necessary to wake MCU up from standby mode, but I tried the same code with Stop Mode and it works.
Another issue is strange operation with debugger (JLINK) connected to the eval board - with Stop mode I had to abort debug session, and reset MCU. In standby mode I tried with connected or disconnected debugger and it has never worked.
Could anyone help me?
Regards
#stm32-standby-wake-rtc #wkup
