what is the meaning of 'EXTI_IT_Pin7' in the below-given code? I am using the STM8L1526 Discovery Board.
#include "stm8l15x.h"
#include "stm8l15x_gpio.h"
#include "stm8l15x_itc.h"
#include "stm8l15x_exti.h"
#include "stm8l15x_clk.h"
#include "stm8l15x_rtc.h"
#include "stm8l15x_tim2.h"
#include "stm8l15x_tim1.h"
#include "stm8l15x_tim3.h"
#include "stm8l15x_tim4.h"
#include "stm8l15x_adc.h"
#include "stm8l15x_pwr.h"
// void Halt_init();
// void GPIO_LowPower_Config(void);
//
void Delay(__IO uint32_t nCount)
{ /* Decrement nCount value */
while (nCount != 0)
{
nCount--;
}
}
void main()
{
// Halt_Init();
TIM1_Cmd(DISABLE);
TIM2_CtrlPWMOutputs(DISABLE);
TIM2_Cmd(DISABLE);
TIM3_Cmd(DISABLE);
TIM4_Cmd(DISABLE);
ADC_Cmd(ADC1, DISABLE);
PWR_PVDCmd(DISABLE);
/* Switch to LSI as system clock source */
/* system clock prescaler: 1*/
CLK_SYSCLKDivConfig(CLK_SYSCLKDiv_1);
CLK_SYSCLKSourceConfig(CLK_SYSCLKSource_LSI);
CLK_SYSCLKSourceSwitchCmd(ENABLE);
while (CLK_GetFlagStatus(CLK_FLAG_LSIRDY) == 0);
CLK_HSICmd(DISABLE);
CLK_HSEConfig(CLK_HSE_OFF);
/* Set STM8 in low power */
PWR_UltraLowPowerCmd(ENABLE);
/* Set GPIO in low power*/
/* Configure unused pins as output push-pull 0 to enter low power */
/* Port A */
GPIO_Init(GPIOA, GPIO_Pin_All, GPIO_Mode_Out_PP_Low_Slow);
/* Port B not AIN */
GPIO_Init(GPIOB, GPIO_Pin_0|GPIO_Pin_1|GPIO_Pin_2|GPIO_Pin_7, GPIO_Mode_Out_PP_Low_Slow);
/* Port B LEDs, so they don't flash at power on */
GPIO_Init(GPIOB, GPIO_Pin_3|GPIO_Pin_4|GPIO_Pin_5, GPIO_Mode_Out_PP_High_Slow);
/* Port C not wakeup pin!! */
GPIO_Init(GPIOC, GPIO_Pin_0|GPIO_Pin_1|GPIO_Pin_2|GPIO_Pin_3|GPIO_Pin_4|GPIO_Pin_5|GPIO_Pin_6, GPIO_Mode_Out_PP_Low_Slow);
/* Port D */
GPIO_Init(GPIOD, GPIO_Pin_All, GPIO_Mode_Out_PP_Low_Slow);
/* Port E */
GPIO_Init(GPIOE, GPIO_Pin_All, GPIO_Mode_Out_PP_Low_Slow);
/* Port F */
GPIO_Init(GPIOF, GPIO_Pin_All, GPIO_Mode_Out_PP_Low_Slow);
/* Stop RTC Source clock */
CLK_RTCClockConfig(CLK_RTCCLKSource_Off, CLK_RTCCLKDiv_1);
/* Stop clock RTC and LCD */
CLK_PeripheralClockConfig(CLK_Peripheral_RTC, DISABLE);
CLK_PeripheralClockConfig(CLK_Peripheral_LCD, DISABLE);
GPIO_Init(GPIOC, GPIO_Pin_3, GPIO_Mode_Out_PP_Low_Fast);
GPIO_ToggleBits(GPIOC, GPIO_Pin_3);
Delay(90000);
EXTI_ClearITPendingBit(EXTI_IT_Pin7);
halt();
GPIO_Init(GPIOE, GPIO_Pin_7, GPIO_Mode_Out_PP_Low_Fast);
GPIO_ToggleBits(GPIOE, GPIO_Pin_7);
Delay(90000);
}