Why??
I do a lot of development on my Powerbook and I got tired of constantly creating a fake interface for dev on my laptop and testing on Travis.ci.
- 2017 Apr 2: Beta Quality
- 2017 Apr 8: Initial python3 support ... this is a pain
So, does this simulate everything on a Raspberry Pi? No! Right now it simulates what I use and need. Over time, more will be added. You are also welcome to submit pull requests for things I haven't added yet.
| Adafruit | LSM303(accelerometer) |
| GPIO | gpio pins |
| picamera | camera |
| RPi | PWM |
| smbus | i2c |
| serial | not done yet |
The preferred way to install this is:
pip install fake_rpi
To submit pull requests and do development:
git clone cd fake_rpi pip install -e .
To fake RPi.GPIO or smbus, this following code must be executed before your application:
# Replace libraries by fake ones
import sys
import fake_rpi
sys.modules['RPi'] = fake_rpi.RPi # Fake RPi (GPIO)
sys.modules['smbus'] = fake_rpi.smbus # Fake smbus (I2C)Then you can keep your usual imports in your application:
import RPi.GPIO as GPIO
import smbus
GPIO.setmode(io.BCM) # now use the fake GPIO
b = GPIO.input(21)
sm = smbus.SMBus(1) # now use the fake smbus
b = sm.read_byte_data(0x21, 0x32) # read in a byteTurning on/off fake calls logging:
from fake_rpi import toggle_print
# by default it prints everything to std.error
toggle_print(False) # turn on/off printingBut I need smbus to return a specific byte for unit testing! Ok, then create a child of my smbus like below
and modify only the methods you need changed:
from fake_rpi import smbus
from fake_rpi import printf
class MyBus(smbus.SMBus):
@printf
def read_byte_data(self, i2c_addr, register):
ret = 0xff
if i2c_addr == 0x21:
ret = 0x55
elif i2c_addr == 0x25:
ret = 0x11
return ret
sm = MyBus()
b = sm.read_byte_data(0x21, 0x32) # read in a byteHere is the output from example.py in the git repo when the printing is
toggled on or off:
kevin@Logan fake_rpi $ ./example.py <<< WARNING: using fake raspberry pi interfaces >>>
kevin@Logan fake_rpi $ ./example.py <<< WARNING: using fake raspberry pi interfaces >>> fake_rpi.RPi.PWM.__init__() fake_rpi.RPi.PWM.start(5,) fake_rpi.smbus.SMBus.__init__(1,) fake_rpi.smbus.SMBus.write_byte_data(1, 2, 3) fake_rpi.smbus.SMBus.read_byte_data(1, 2): 21 fake_rpi.smbus.SMBus.close() __main__.MyBus.__init__() __main__.MyBus.read_byte_data(1, 2): 72 __main__.MyBus.read_i2c_block_data(1, 2, 3): [90, 90, 90]
| 2019-03-29 | 0.6.1 | bug fix with randint range |
| 2017-11-30 | 0.6.0 | bug fix with printing |
| 2017-10-23 | 0.5.3 | bug fix with randint |
| 2017-09-05 | 0.5.1 | flushing out interfaces |
| 2017-07-07 | 0.3.0 | fixed bugs, print statement, and reduced dups |
| 2017-04-08 | 0.1.0 | initial python3 setup and support |
| 2017-04-02 | 0.0.2 | pushed to pypi with landscape.io fixes |
| 2017-04-01 | 0.0.1 | created |
Copyright (c) 2017 Kevin J. Walchko
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