Enum pl_int_num

Enum pl_int_num contains the list of constants that refer to available interrupt lines. Interrupt lines are mapped to GPIO lines (this mapping can't be altered).

Enum pl_int_num includes the following constants:

0- PL_INT_NUM_0:Interrupt line 0 (mapped to I/O line 0, which serves as the CTS input of the serial port).
1- PL_INT_NUM_1:Interrupt line 1 (mapped to I/O line 1, which serves as the DSR input of the serial port).
2- PL_INT_NULL:This is a NULL interrupt line that does not physically exist.