python: navio: Navio: add RCInput Navio+ support

Make new RCInput module for Navio+ in add this module in __init__ file

Python/navio/Navio/RCInput.py

@@ -0,0 +1,42 @@
+import RPi.GPIO as GPIO
+import pigpio
+
+class RCInput():
+
+ PPM_SYNC_LENGTH = 4000
+
+ CHANNEL_COUNT = 8
+ channels = [0,0,0,0,0,0,0,0]
+
+ def cbf(self, gpio, level, tick):
+ if (level == 0):
+ deltaTime = tick - self.previousTick
+ self.previousTick = tick
+
+ if (deltaTime >= self.PPM_SYNC_LENGTH):
+ self.currentchannel = 0
+ else:
+ if (self.currentchannel < self.CHANNEL_COUNT):
+ self.channels[self.currentchannel] = deltaTime
+ self.currentchannel += 1
+
+ def __init__(self):
+
+ GPIO.setmode(GPIO.BCM)
+ GPIO.setwarnings(False)
+ GPIO.setup(27, GPIO.OUT)
+ GPIO.output(27, GPIO.LOW)
+
+ self.pi = pigpio.pi()
+ self.pi.set_mode(4, pigpio.INPUT)
+
+ self.currentchannel = 0
+ self.previousTick = self.pi.get_current_tick()
+ self.cb1 = self.pi.callback(4, pigpio.EITHER_EDGE, self.cbf)
+
+ def read(self, ch):
+ try:
+ return self.channels[ch]
+ except IndexError:
+ print("Channel number too large")
+ exit(1)

Python/navio/Navio/__init__.py

@@ -1,3 +1,4 @@
 from .adafruit_ads1x15 import ADS1x15
 from .Led import Led
 from .ADC import ADC
+from .RCInput import RCInput