long press problem

[David.Cheng]

void main(void)
{
 /* Infinite loop */
 
 CLK_SYSCLKDivConfig(CLK_SYSCLKDiv_8);
 
 GPIO_Init(GPIOE, GPIO_Pin_7, GPIO_Mode_In_PU_IT);
 EXTI_setup();
 
 halt(); // first active
 
 
 #if 0
 while(1)
 {
 halt();
 delay_ms(1000);
 
 if(GPIO_ReadInputDataBit(GPIOE, GPIO_Pin_7) == 0)
 {
 //i++;
 //if(i == 25)
 break;
 }
 
 
 }
 #endif
 usart_setup();
 USART_SendData8(USART1, 'a');
 USART_SendData8(USART1, 'b');
 
 while (1)
 {
 }
}

void EXTI_setup(void)
{
 
 ITC_DeInit();
 ITC_SetSoftwarePriority(EXTI7_IRQn, ITC_PriorityLevel_1);
 
 
 EXTI_DeInit();
 
 EXTI_SetPinSensitivity(GPIO_Pin_7, EXTI_Trigger_Falling);
 //EXTI_SetPinSensitivity(GPIO_Pin_7, EXTI_Trigger_Rising);
 //EXTI_SetTLISensitivity(EXTI_TLISENSITIVITY_FALL_ONLY);
 enableInterrupts();
 
}

when in long press, it does not wakeup.

until release , then wakeup

[JoniS]

EXTI_SetPinSensitivity(GPIO_Pin_7, EXTI_Trigger_Rising);

​

Change the trigger for that interrupt to rising edge instead of falling edge, then it should wake up instantly.​

[David.Cheng]

debug long time, falling edge can not

when change to rising edge , configure pe7 to floating input with it , and gpio connect to gnd directly?

[JoniS]

Can you post the schematic how the button is connected?

​

For rising edge to work, the io should be pulled down, and button then connects it to VCC.

​

For falling edge to work, IO should be pulled to VCC, button then grounds it.

​

Based on your initial proplem description i assume the IO is pulled low(gnd) and the button connects to vcc, which would result to behaviour you observe, which is that mcu wakeups when the button is released.​

[David.Cheng]

the falling edge one