update with notes

README.md

@@ -46,5 +46,16 @@ ctest
 - add functions to load saved configs
 
 
+###Mocking the TWI/I2C
+
+The twi needs to be mocked or faked correctly to make the testing
+of the functions doable.
+
+The best way I can find to handle this is with a buffer of twi data
+that simulate registers that the program reads/writes to.
+
+This is handled by using function pointers for the tx and rx of i2c/twi data.
+
+