Added I2C example and further compatibility modules listed

[hackapet/Adafruit_Blinka.git] / examples / index.md

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-This repository is structured around integration tests found in the python/testing
-directory. The tests offer a procedural way to assert equivalence between 'native' CircuitPython (CP) behaviour and 
-behaviour of the MicropythonCircuitPython (MCP) layer.
+# About Adafruit_Micropython_Blinka

 
 

+This repository is structured around integration tests rooted at the `test/src`
+directory, intended to test the compatibility layer rooted in `src`. 

 
 

-In particular, automated introspection of the python runtime combines with interactive prompts
-to configure a scenario for testing (e.g. which platform, which board, what is wired to it) meaning that 
-the same routines can be carried out on Micropython boards, dual boards running either CP or MCP
-or dedicated CP boards. 
+The tests offer a procedural way to assert equivalence between 'native' CircuitPython behaviour and behaviour of the **adafruit_blinka** compatibility layer.

 
 

-From a project-management point of view, tests can provide a strictly-interpreted way to 
-communicate missing features, also providing the implicit means of verifying that intended 
-features for the MCP layer are in fact already served from the CP layer.
+The structure of the testing modules permits test suites to be imported and configured selectively on different implementations, platforms and boards (see `adafruit_blinka.agnostic.py` for definitions of these terms).
+
+Automated introspection of the python runtime combines with interactive prompts
+to configure a scenario for testing (e.g. which platform, which board, what is wired to it)
+so the same routines can be carried out on Micropython boards, dual boards running either CircuitPython or Micropython, or dedicated CircuitPython boards.
+
+Typically the tests have first run on a native CircuitPython platform, and are then used to 
+prove equivalence on a Micropython platform running the **adafruit_blinka** compatibility layer.
+
+# Tests so far
+
+Tests of compatible versions of **digitalio**, **board** and **microcontroller** have successfully demonstrated
+the same code running on either platform, setting and getting pin values and using pull.
+
+Tests have also proven compatibility of the following unmodified CircuitPython libraries...
+
+* adafruit_bme280
+* adafruit_mma8451
+* adafruit_gps
+
+...which proves the fundamentals of bitbangio.I2C, busio.I2C and busio.UART

 
 # Example
 
 
 # Example
 

-To take a minimal example, the following asserts the default behaviour of the DigitalInOut 
+To take a minimal example, the following should assert the default behaviour of the DigitalInOut 

 constructor, checks the behaviour of switch_to_input/output(), configures a pin as a pull-up button, a pull-down button and an LED.
 
 ```python
 constructor, checks the behaviour of switch_to_input/output(), configures a pin as a pull-up button, a pull-down button and an LED.
 
 ```python

-import testing
-testing.main()
+from testing import test_module_name
+test_module_name("testing.universal.digitalio")

 ```
 
 ```
 

-## Comments
-
-There are routines in the top level of the repo like `upload_feather_m0_watch.py` which selectively synchronize files it with the CIRCUITPY or PYBFLASH folder for stm32 and samd21 (with a file-watching behaviour for edits), or which execute a selective ampy upload for CircuitPython/Micropython on esp8266.
-
-Given the limited memory available, on the Feather M0 Express, running the test case requires that 
-the [micropython-lib unittest library](https://github.com/micropython/micropython-lib/blob/master/unittest/unittest.py) 
-is distributed as a compatible Micropython bytecode .mpy file 
-pre-compiled under an mpy-cross version from the CircuitPython 2.2.3-tagged repository. Otherwise
-simply loading the unittest module already busts the available memory. 
-
-# Test Suite Structure
+Or to take a more involved example of constructing a test suite requiring hardware, 
+the following should verify I2C communication with a BME280 module.

 
 

-The structure of the testing modules is as follows, to permit test suites to be imported selectively
-on different implementations, platforms and boards (see agnostic.py for definitions of these terms)...
+```python
+import unittest
+import testing.universal.i2c
+suite = unittest.TestSuite()
+suite.addTest(testing.universal.i2c.TestBME280Interactive)
+runner = unittest.TestRunner()
+runner.run(suite)
+```

 
 

-* _testing_ - common function definitions for suite-execution
-* _testing.mcp_ - test suite for hardware-agnostic elements of MCP layer (e.g. Enum)
-* _testing.implementation_ - calculates implementation-specific parameters for test fixtures
-* _testing.implementation.all_ - suites expected to run on all platforms
-* _testing.implementation.micropython_ - suites testing MCP-specific classes and behaviours (under the hood of the hardware compatibility layer) and only 
-expected to run on Micropython
-* _testing.implementation.circuitpython - suites testing CircuitPython-specific 
-classes and behaviours, and only expected to run in CircuitPython_

 
 

-e.g.
-* testing.implementation.all.digitalio - tests against the 
-digitalio module regardless of platform
-* testing.implementation.circuitpython.digitalio - tests of digitalio against a 
-native circuitpython host
-* testing.implementation.micropython.digitalio - tests of digitalio against the MCP
-compatibility layer
+To prove this on a newly-flashed Feather Huzzah running Micropython 1.9.3, 
+it should be possible (on a posix-compliant platform with adafruit_ampy installed) 
+to `cd test/scripts` then run `./upload_feather_huzzah_micropython_put.sh` to 
+synchronize relevant files to the filesystem of the huzzah, reset the huzzah then 
+connect using `screen /dev/ttyUSB0 115200` before running the above commands.

 
 

+Micropython hosts require a micropython repository alongside
+the Adafruit_Micropython_Blinka repository. For circuitpython, 
+the repository is expected to be called circuitpython_2.2.3. 
+In each case, the matching version should have been checked out from github
+and `make` needs to have been run in the `mpy-cross` folder. This provides a tool 
+to make bytecode-compiled .mpy versions of all .py files before upload so that 
+tests can be achieved within the limited memory available on many target platforms. 

 
 

-# Next Steps 
+## Comments

 
 

-To be able to run a substantial series of testing modules, a dedicated 
-feather m0 express firmware image should be prepared with [frozen modules](https://learn.adafruit.com/micropython-for-samd21/frozen-modules) which 
-minimises overhead by holding test definitions in flash instead of RAM.
+There are reference routines in `test/scripts` like `upload_feather_huzzah_micropython_put.sh` which execute a selective bytecode-compile to .mpy format and an ampy upload for CircuitPython/Micropython on esp8266, or `upload_pyboard_micropython_cp.sh` which selectively bytecode-compiles and synchronizes files with cp to the CIRCUITPY or PYBFLASH disk mount for stm32 and samd21 platforms.
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