When called with wPi pin number (for example, 6), wiringPiISR() calls /usr/bin/gpio with "6" as argv[2] and that fails, because can't put "6" into /sys/class/gpio/export
When called with GPIO pin number (for example, 257, which is the same pin on this board), wiringPiISR() aborts immediately with "wiringPiISR: pin must be 0-63 (257)" message.
When called with wPi pin number (for example, 6), wiringPiISR() calls /usr/bin/gpio with "6" as argv[2] and that fails, because can't put "6" into /sys/class/gpio/export
When called with GPIO pin number (for example, 257, which is the same pin on this board), wiringPiISR() aborts immediately with
"wiringPiISR: pin must be 0-63 (257)"
message.