I have few questions to ask, before I decide to buy Rev Pi.
Question 1: Does the Rev Pi support SysFs GPIO Pin access (https://www.kernel.org/doc/Documentation/gpio/sysfs.txt) ?
I want to use 4-Diac ( https://eclipse.org/4diac/ ) on Rev Pi. 4-Diac runs FORTE, which requires SysFs GPIO pin access.
Question 2: How does the Rev Pi access the GPIO pins? Do I have to buy separate I/O module for that?
Question 3: Can I access GPIO pins as I would normally do in Python, with some code like this?
Code: Select all
# External module imports
import RPi.GPIO as GPIO
import time
# Pin Definitons:
pwmPin = 18 # Broadcom pin 18 (P1 pin 12)
ledPin = 23 # Broadcom pin 23 (P1 pin 16)
butPin = 17 # Broadcom pin 17 (P1 pin 11)
dc = 95 # duty cycle (0-100) for PWM pin
# Pin Setup:
GPIO.setmode(GPIO.BCM) # Broadcom pin-numbering scheme
GPIO.setup(ledPin, GPIO.OUT) # LED pin set as output
GPIO.setup(pwmPin, GPIO.OUT) # PWM pin set as output
pwm = GPIO.PWM(pwmPin, 50) # Initialize PWM on pwmPin 100Hz frequency
GPIO.setup(butPin, GPIO.IN, pull_up_down=GPIO.PUD_UP) # Button pin set as input w/ pull-up
# Initial state for LEDs:
GPIO.output(ledPin, GPIO.LOW)
pwm.start(dc)
print("Here we go! Press CTRL+C to exit")
try:
while 1:
if GPIO.input(butPin): # button is released
pwm.ChangeDutyCycle(dc)
GPIO.output(ledPin, GPIO.LOW)
else: # button is pressed:
pwm.ChangeDutyCycle(100-dc)
GPIO.output(ledPin, GPIO.HIGH)
time.sleep(0.075)
GPIO.output(ledPin, GPIO.LOW)
time.sleep(0.075)
except KeyboardInterrupt: # If CTRL+C is pressed, exit cleanly:
pwm.stop() # stop PWM
GPIO.cleanup() # cleanup all GPIO
