Posted on May 17, 2011 at 13:31Hi all,
i am trying to enter and exit STOP mode PWR_EnterSTOPMode within a EXTI line connected to an external button (GPIO).
The behavior i'd like to have is a single button that when pressed goes into STOP and when pressed again wake up and generate a system reset.
unfortunately i cannot find a way to make it work, and the posts here do not solve my problems. :(
with PWR_STOPEntry_WFI, i cannot exit from Stop mode. with PWR_STOPEntry_WFE it goes in hard fault when i press the button the second time to wake it up. could someone explain the basic procedure to make it work?
here is the relevant code:
-----------SETUP:
NVIC_InitTypeDef NVIC_InitStructure;
EXTI_InitTypeDef EXTI_InitStructure;
GPIO_InitTypeDef GPIO_InitStructure;
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_3;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
GPIO_Init(GPIOE, &GPIO_InitStructure);
GPIO_EXTILineConfig(GPIO_PortSourceGPIOE, GPIO_PinSource3);
EXTI_InitStructure.EXTI_Line = EXTI_Line3;
EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;
EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Falling;
EXTI_InitStructure.EXTI_LineCmd = ENABLE;
EXTI_Init(&EXTI_InitStructure);
NVIC_InitStructure.NVIC_IRQChannel = EXTI3_IRQChannel;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
-----------in ISR:
void EXTI3_IRQHandler(void)
{
EXTI_InitTypeDef EXTI_InitStructure;
if(EXTI_GetITStatus(EXTI_Line3) != RESET)
{
EXTI_ClearITPendingBit(EXTI_Line3);
GPIO_EXTILineConfig(GPIO_PortSourceGPIOE, GPIO_PinSource3);
EXTI_InitStructure.EXTI_Line = EXTI_Line3;
EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Event;
EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Falling;
EXTI_InitStructure.EXTI_LineCmd = ENABLE;
EXTI_Init(&EXTI_InitStructure);
PWR_EnterSTOPMode(PWR_Regulator_ON, PWR_STOPEntry_WFE);
NVIC_GenerateSystemReset();
}
what am i missing?
Thank you!
