Скачать или смотреть BeagleBone Black with 555 Timer

I made this setup to test out reading inputs and writing outputs on the BBB for my Fundamentals of Embedded Linux class. In this setup, I have a 555 Timer creating a roughly 13 KHz square wave feeding into pin 14 of the BBB. I'm using a shell script to poll pin 14 and then write out to pin 13 which is connected to the LED.

I had earlier tried to do this via bonescript and using attachInterrupt(), but it appeared that the timer frequency may have overwhelmed things and the BBB basically slowed to a crawl. My next steps are to investigate what my options are for real interrupts in either the user space or something like a driver.