使用STM8L101F3P芯片，用iar库函数，想实现最简单的按键中断，在库里有一函数
void EXti_SetHalfPortSelection(EXTI_HalfPort_TypeDef EXTI_HalfPort,
FunctionalState NewState)
如图所示，
在使用这个函数的时候，EXTI_HalfPort_TypeDef EXTI_HalfPort可以使用上面提供的组合，
例如EXTI_HalfPort_B_LSB
可是FunctionalState NewState这个应该填什么进去呢，说明没有提供，直接填上十六进制数上去也不行，请教大家一下，谢谢...！
下面贴上直接在库里复制出的原函数
/**
* @brief Configure the half port interrupt selection.
* @note This function must be called once the port sensitivity is configured,
* otherwise this function call won't have any effect on the port external interrupt.
* @param EXTI_HalfPort The port part to access (MSB or LSB).
* This parameter can be any combination of the following values:
* @arg EXTI_HalfPort_B_LSB: Interrupt selector PB(3:0)
* @arg EXTI_HalfPort_B_MSB: Interrupt selector PB(7:4)
* @arg EXTI_HalfPort_D_LSB: Interrupt selector PE(3:0)
* @arg EXTI_HalfPort_D_MSB: Interrupt selector PE(7:4)
* @param NewState The external interrupt new state.
* @retval None
*/
void EXTI_SetHalfPortSelection(EXTI_HalfPort_TypeDef EXTI_HalfPort,
FunctionalState NewState)
{
/* Check function parameters */
assert_param(IS_EXTI_HALFPORT(EXTI_HalfPort));
assert_param(IS_FUNCTIONAL_STATE(NewState));
if (NewState != DISABLE)
{
EXTI->CONF |= (uint8_t)EXTI_HalfPort; /* Enable port interrupt selector */
}
else /*NewState == DISABLE */
{
EXTI->CONF &= (uint8_t)(~(uint8_t)EXTI_HalfPort); /* Disable port interrupt selector */
}
}
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