devices

Author	SHA1	Message	Date
M-A	f33f0732fb	spi: Refactor Conn and ConnCloser into Conn, Port and PortCloser (#131 ) This clarifies the difference on ownership and makes it clear that DevParams() is essentially a 'connection factory'. The flow is: Bus -> Port -> Conn Doing this caught inconsistencies in the unit tests. Made the structs in spitest enforce the fact that DevParams() can only be called once. In a follow up, I'll rename a lot of 'bus' to 'port' to be more consistent but punting to not make this change unreviewable.	9 years ago
Marc-Antoine Ruel	2f70f83e86	Make conntest output copy-pastable; fix go vet issues	9 years ago
Marc-Antoine Ruel	860d4aa457	For all IO, rename Write to W and Read to R Fix Tx() for the Record objects (conntest, i2ctest, onewiretest and spitest) to guard against write buffer corruption.	9 years ago
Marc-Antoine Ruel	daad425c63	ssd1306: implement SPI and transparent differential update. - Increase test coverage to 100%. - Add ssd1306smoketest. - Complete SPI 4-wire implementation. Differential update reduces the amount of data sent over the I²C/SPI bus at the (small) cost of slightly more CPU usage. On many platform, I²C default transfert speed is only 100KHz so when only a small section of the display is updated, this can lead to significant performance improvement. For now only page based differential update is used, as column based offset corrupt the display. This still results in large savings.	9 years ago