long pressing can not wakeup stm8l152

[David.Cheng]

/**
  ******************************************************************************
  * @file    Project/STM8L15x_StdPeriph_Template/main.c
  * @author  MCD Application Team
  * @version V1.6.1
  * @date    30-September-2014
  * @brief   Main program body
  ******************************************************************************
  * @attention
  *
  * <h2><center>&copy; COPYRIGHT 2014 STMicroelectronics</center></h2>
  *
  * Licensed under MCD-ST Liberty SW License Agreement V2, (the "License");
  * You may not use this file except in compliance with the License.
  * You may obtain a copy of the License at:
  *
  *        http://www.st.com/software_license_agreement_liberty_v2
  *
  * Unless required by applicable law or agreed to in writing, software 
  * distributed under the License is distributed on an "AS IS" BASIS, 
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  * See the License for the specific language governing permissions and
  * limitations under the License.
  *
  ******************************************************************************
  */
 
/* Includes ------------------------------------------------------------------*/
#include "stm8l15x.h"
 
/** @addtogroup STM8L15x_StdPeriph_Template
  * @{
  */
 
/* Private typedef -----------------------------------------------------------*/
/* Private define ------------------------------------------------------------*/
/* Private macro -------------------------------------------------------------*/
/* Private variables ---------------------------------------------------------*/
/* Private function prototypes -----------------------------------------------*/
 
/* Private functions ---------------------------------------------------------*/
void delay_ms(u16 n_ms)
{
 
  CLK_PeripheralClockConfig(CLK_Peripheral_TIM2, ENABLE);
 
/* Init TIMER 4 prescaler: / (2^6) = /64 */
  //TIM2->PSCR = 6;
  TIM2->PSCR = 3;
 
/* HSI div by 1 --> Auto-Reload value: 16M / 64 = 1/4M, 1/4M / 1k = 250*/
  TIM2->ARRH = 0;
  TIM2->ARRL = 250;
  
/* Counter value: 2, to compensate the initialization of TIMER*/
    
  TIM2->CNTRH = 0;
  TIM2->CNTRL = 2;
 
/* clear update flag */
  TIM2->SR1 &= ~TIM_SR1_UIF;
 
/* Enable Counter */
  TIM2->CR1 |= TIM_CR1_CEN;
 
  while(n_ms--)
  {
    while((TIM2->SR1 & TIM_SR1_UIF) == 0) ;
    TIM2->SR1 &= ~TIM_SR1_UIF;
  }
 
/* Disable Counter */
  TIM2->CR1 &= ~TIM_CR1_CEN;
}
 
 
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();
 
}
 
void usart_setup(void)
{
    GPIO_ExternalPullUpConfig(GPIOC, GPIO_Pin_3, ENABLE);
    GPIO_ExternalPullUpConfig(GPIOC, GPIO_Pin_2, ENABLE);
 
    CLK_PeripheralClockConfig(CLK_Peripheral_USART1, ENABLE);
    USART_DeInit(USART1);
    USART_Init(USART1, (uint32_t)9600, USART_WordLength_8b, USART_StopBits_1,
                   USART_Parity_No, (USART_Mode_TypeDef)(USART_Mode_Tx | USART_Mode_Rx));
                   
                   
    USART_ITConfig(USART1, USART_IT_RXNE, ENABLE);
    USART_Cmd(USART1, ENABLE);
 
}
/**
  * @brief  Main program.
  * @param  None
  * @retval None
  */
void main(void)
{
  /* Infinite loop */
  
    CLK_SYSCLKDivConfig(CLK_SYSCLKDiv_8);
  
    GPIO_Init(GPIOE, GPIO_Pin_7, GPIO_Mode_In_PU_IT);
    EXTI_setup();
 
 
loop:
    halt(); // first active
    
    usart_setup();
    USART_SendData8(USART1, 'a');
    
    delay_ms(5000);
        
    if(GPIO_ReadInputDataBit(GPIOE, GPIO_Pin_7) == RESET)
    {
            //i++;
            //if(i == 25)
        USART_SendData8(USART1, 'n');
        while (USART_GetFlagStatus(USART1, USART_FLAG_TXE) == RESET);
        
        //USART_SendData8(USART1, 'G');
        goto loop;
    
    }
    else
    {    
        USART_SendData8(USART1, 'C');
        while (USART_GetFlagStatus(USART1, USART_FLAG_TXE) == RESET);
    }    
    
    
    USART_SendData8(USART1, 'b');
  
  while (1)
  {
  }
}
 
#ifdef  USE_FULL_ASSERT
 
/**
  * @brief  Reports the name of the source file and the source line number
  *   where the assert_param error has occurred.
  * @param  file: pointer to the source file name
  * @param  line: assert_param error line source number
  * @retval None
  */
void assert_failed(uint8_t* file, uint32_t line)
{ 
  /* User can add his own implementation to report the file name and line number,
     ex: printf("Wrong parameters value: file %s on line %d\r\n", file, line) */
 
  /* Infinite loop */
  while (1)
  {
  }
}
#endif
 
/**
  * @}
  */
 
/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/

key pe7 release , connect to nothing,

when press pe7 connect to GND

when in long press, i can not wakeup, until release

INTERRUPT_HANDLER(EXTI7_IRQHandler,15)
{
    /* In order to detect unexpected events during development,
       it is recommended to set a breakpoint on the following instruction.
    */
    EXTI_ClearITPendingBit(EXTI_IT_Pin7);
}