bool enums GPIO_GetPinStatus

related Question "get pin status"(gayan_gamage-san)

When I call the "bool GPIO_GetPinStatus( GPIO_PORT port, GPIO_PIN pin ）",
this function seems to return the "TRUE" and "FALSE" and non-"TRUE or FALSE".

And MT_dialog has suggested using the "enums" type rather than "bool" type.

How many return values using this function ?
And could you show me the meaning of the each return values("TRUE", "FALSE" and "?????")?

SDK信息:
源代码
\...\DA1458x_SDK\5.0.3\sdk\platform\driver\gpio\gpio.c

Discription: