Support for C.H.I.P.

[chrisvis]

Hi,

First of all, great library! I use it to control my porch light through a component in Home Assitant. I recently migrated my setup from a RPi to a C.H.I.P. and noticed that this package does not work anymore. This because RPi.GPIO of course only works on a RPi. However there is a (almost) drop-in replacement for this dependency called CHIP_IO. The only method that CHIP_IO seems to lack is GPIO.setmode.

With this patch a got the library working on the C.H.I.P.:

diff --git a/rpi_rf/rpi_rf.py b/rpi_rf/rpi_rf.py
index 3949169..72c1e70 100644
--- a/rpi_rf/rpi_rf.py
+++ b/rpi_rf/rpi_rf.py
@@ -6,7 +6,10 @@ import logging
 import time
 from collections import namedtuple

-from RPi import GPIO
+try:
+    from RPi import GPIO
+except:
+    from CHIP_IO import GPIO

 MAX_CHANGES = 67

@@ -54,8 +57,11 @@ class RFDevice:
         self.rx_proto = None
         self.rx_bitlength = None
         self.rx_pulselength = None
-
-        GPIO.setmode(GPIO.BCM)
+        # the method 'setmode' is not available in CHIP_IO.GPIO
+        try:
+            GPIO.setmode(GPIO.BCM)
+        except:
+            pass
         _LOGGER.debug("Using GPIO " + str(gpio))

     def cleanup(self):

If you are willing to add support for C.H.I.P. I could make a PR out of this patch.

Cheers!

[bachp]

I think it would make more sense to make the module injectable by some means. This could then also be used for Beaglebone black with Adafruit_BBIO.

[chrisvis]

Yes, I agree that using injection would be a cleaner approach.
I can imagine that an important requirement is to stay backwards compatible, so that the default gpio module would be RPi version.

[nunojusto]

Hello guys, i started porting rpi-rf (that i love) to CHIP using the new CHIP_IO.GPIO from @xtacocorex
It's working now... or sort of... you can check it out here https://github.com/nunojusto/CHIP-rf/

The problem is that i cannot have clear results and i', working directly with CHIP_IO guy to solve some of the error.
Please try and help if you can :)
Thankx

EDIT: Oops, i see that "chrisvis" is advanced on it also. Lets share common problems.

@bachp @chrisvis @milaq

[xtacocorex]

The setmode() function isn't supported on the BBB either (CHIP_IO is ported from it), so the try/except catch you have @chrisvis is awesome. Which GPIO pins were you using @chrisvis when you got this working? Since this library uses callbacks, only the XIO and AP-EINT pins can be used on the CHIP.

If needed, I can always add the setmode() into CHIP_IO and have it do nothing. I almost prefer not to do this as any code ported to CHIP from the RPi will have to be adjusted for Pin names anyway, it's trivial to remove that line of code.

[nunojusto]

Also @chrisvis, i see that AP-EINT PINs are the only ones who can give a good response. XIO have much more interference. And also, 3,3v for receiver, works better than 5v.