I am using a Raspberry Pi 2 Model B v1.1. I have looked at the GPIO file in /sys but I don't understand how I actually turn on/ turn off GPIO ports or I set them to read in/read out, I am trying to do a project for college using my Raspberry PI and LISP but without this knowledge I am unable to do this, this is the library that is written for NewLIsp: https://github.com/gatesphere/raspi-gpio-newlisp/blob/master/raspi-gpio.lsp Some clarification of what actually needs to be written and where it needs to be written to send out/read in values on the GPIO ports is need, any help will be greatly appreciated.
This is clearly and simply documented in the kernel docs. I will not bother to regurgitate it here.
Note that you can't use
echo > because of redirection, but that does not impact what you are trying to do.
Anecdotely I'd say using if using high level stream functions doesn't work on sys/proc nodes, use lower level methods. I don't speak lisp so I don't know how relevant that is.
Here are some chunks of a program that might help - the whole thing is too big
import RPi.GPIO as GPIO import time import datetime from datetime import timedelta import os import subprocess import glob import suntime
GPIO.setwarnings(False) GPIO.setmode(GPIO.BOARD) ## Use board pin numbering
for i in range(0,6): ## Print current pin usage
fno = GPIO.gpio_function(pinarr[i]) ## get function number print ("Pin " + str(pinarr[i]) + " usage is " + pin_use[fno])
for i in range(0,2):
print (" " )
print ("Python version is %s " % str(sys.version[0:6]))
print ("GPIO version is %s " % GPIO.VERSION)
print ("Board revision is %s " % getbr()[:4])
print ("Program name is %s " % sys.argv)
print("System path is ",sys.path)
for i in range(len(pinarr)): GPIO.setup((pinarr[i]), GPIO.IN, pull_up_down=GPIO.PUD_DOWN)